Publication
2024
Takao Itioka Usun Shimizu-kaya, Shuichiro Tagane
A Guide to Macaranga (Euphorbiaceae) of Lambir Hills National Park, Sarawak, Malaysia Journal Article
In: Contributions from the Biological Laboratory Kyoto University, vol. 32, pp. 50-81, 2024.
@article{Shimizu-kaya2024,
title = {A Guide to Macaranga (Euphorbiaceae) of Lambir Hills National Park, Sarawak, Malaysia},
author = {Usun Shimizu-kaya, Takao Itioka, Shuichiro Tagane, Endela Tipot, Melvin Terry Gumal},
url = {https://repository.kulib.kyoto-u.ac.jp/dspace/handle/2433/289910},
year = {2024},
date = {2024-10-17},
urldate = {2024-10-17},
journal = {Contributions from the Biological Laboratory Kyoto University},
volume = {32},
pages = {50-81},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Komada, Natsuki, Tagane, Shuichiro, Shimizu-kaya, Usun, Iku, Asano, Jelani, Nur Safinas Binti, Ling, Chea Yiing, Mizuno, Takafumi, Gumal, Melvin Terry, Pungga, Runi Anak Sylvester, Itioka, Takao
A checklist of showy mistletoe (Santalales, Loranthaceae) of Lambir Hills National Park in Sarawak, Malaysian Borneo Journal Article
In: Tropics, vol. 33, no. 1, pp. 57-71, 2024.
@article{NatsukiKomada2024MS23-08,
title = {A checklist of showy mistletoe (Santalales, Loranthaceae) of Lambir Hills National Park in Sarawak, Malaysian Borneo},
author = {Natsuki Komada and Shuichiro Tagane and Usun Shimizu-kaya and Asano Iku and Nur Safinas Binti Jelani and Chea Yiing Ling and Takafumi Mizuno and Melvin Terry Gumal and Runi Anak Sylvester Pungga and Takao Itioka},
doi = {10.3759/tropics.MS23-08},
year = {2024},
date = {2024-01-01},
journal = {Tropics},
volume = {33},
number = {1},
pages = {57-71},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2023
Shimizu-kaya, Usun, Hyodo, Fujio, Ueda, Shouhei, Komatsu, Takashi, Meleng, Paulus, Itioka, Takao
Food habits of 3 myrmecophilous bug species on myrmecophytic Macaranga (Malpighiales: Euphorbiaceae) vary from herbivory to predation Journal Article
In: Journal of Insect Science, vol. 23, no. 5, pp. 2, 2023, ISSN: 1536-2442.
@article{10.1093/jisesa/iead078,
title = {Food habits of 3 myrmecophilous bug species on myrmecophytic Macaranga (Malpighiales: Euphorbiaceae) vary from herbivory to predation},
author = {Usun Shimizu-kaya and Fujio Hyodo and Shouhei Ueda and Takashi Komatsu and Paulus Meleng and Takao Itioka},
url = {https://doi.org/10.1093/jisesa/iead078},
doi = {10.1093/jisesa/iead078},
issn = {1536-2442},
year = {2023},
date = {2023-01-01},
journal = {Journal of Insect Science},
volume = {23},
number = {5},
pages = {2},
abstract = {Myrmecophytes have mutualistic relationships with symbiotic ants. Although myrmecophytic Macaranga (Malpighiales: Euphorbiaceae) species are well protected by aggressive Crematogaster (Hymenoptera: Formicidae) ants, some bug species occur on the myrmecophytes. To clarify the associations of these bugs with the plants and the ants, we studied the food habits of 3 bug species, Pilophorus lambirensis Nakatani et Komatsu, 2013 (Hemiptera: Miridae: Phylinae), Phylinae sp. 1, and Arbela sp. 1 (Hemiptera: Nabidae). We conducted field observations in a Bornean rainforest. First, we located these bugs and studied their behavioral responses to the ants on Macaranga species; we then conducted stable isotope analyses. All bugs avoided direct contact with ants, but they occurred only on trees with active ants. Pilophorus lambirensis and Phylinae sp. 1 were most commonly observed on the apical parts of host trees, whereas Arbela sp. 1 was mainly in areas distant from the apical parts where ants were sparse. The stable isotope ratios indicated that Phylinae sp. 1 fed on food bodies, which are nutrient-rich spherical bodies produced by Macaranga trees on the apical parts for ants. Although the main diet of the other 2 species remains unclear, nitrogen isotopic signatures demonstrated that P. lambirensis is herbivorous, whereas Arbela sp. 1 is carnivorous. However, the distant location from ants and its isotopic signatures indicated that Arbela sp. 1 rarely fed on the ants. At least 2 mirid bug species might obtain enemy-free space in addition to the food provided by the myrmecophytes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Myrmecophytes have mutualistic relationships with symbiotic ants. Although myrmecophytic Macaranga (Malpighiales: Euphorbiaceae) species are well protected by aggressive Crematogaster (Hymenoptera: Formicidae) ants, some bug species occur on the myrmecophytes. To clarify the associations of these bugs with the plants and the ants, we studied the food habits of 3 bug species, Pilophorus lambirensis Nakatani et Komatsu, 2013 (Hemiptera: Miridae: Phylinae), Phylinae sp. 1, and Arbela sp. 1 (Hemiptera: Nabidae). We conducted field observations in a Bornean rainforest. First, we located these bugs and studied their behavioral responses to the ants on Macaranga species; we then conducted stable isotope analyses. All bugs avoided direct contact with ants, but they occurred only on trees with active ants. Pilophorus lambirensis and Phylinae sp. 1 were most commonly observed on the apical parts of host trees, whereas Arbela sp. 1 was mainly in areas distant from the apical parts where ants were sparse. The stable isotope ratios indicated that Phylinae sp. 1 fed on food bodies, which are nutrient-rich spherical bodies produced by Macaranga trees on the apical parts for ants. Although the main diet of the other 2 species remains unclear, nitrogen isotopic signatures demonstrated that P. lambirensis is herbivorous, whereas Arbela sp. 1 is carnivorous. However, the distant location from ants and its isotopic signatures indicated that Arbela sp. 1 rarely fed on the ants. At least 2 mirid bug species might obtain enemy-free space in addition to the food provided by the myrmecophytes.
2022
Ichie, Tomoaki, Igarashi, Shuichi, Yoshihara, Ryo, Takayama, Kanae, Kenzo, Tanaka, Niiyama, Kaoru, Shari, Nur Hajar Zamah, Hyodo, Fujio, Tayasu, Ichiro
In: Methods in Ecology and Evolution, vol. 13, no. 5, pp. 1135-1147, 2022.
@article{https://doi.org/10.1111/2041-210X.13823,
title = {Verification of the accuracy of the recent 50 years of tree growth and long-term change in intrinsic water-use efficiency using xylem Δ14C and δ13C in trees in an aseasonal tropical rainforest},
author = {Tomoaki Ichie and Shuichi Igarashi and Ryo Yoshihara and Kanae Takayama and Tanaka Kenzo and Kaoru Niiyama and Nur Hajar Zamah Shari and Fujio Hyodo and Ichiro Tayasu},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/2041-210X.13823},
doi = {https://doi.org/10.1111/2041-210X.13823},
year = {2022},
date = {2022-01-01},
journal = {Methods in Ecology and Evolution},
volume = {13},
number = {5},
pages = {1135-1147},
abstract = {Abstract Growth analysis based on tree-ring chronology is difficult in trees in aseasonal tropical rain forests, because annual growth rings may be unclear or completely absent. Fortunately, tree growth history recorded in xylem tissue is capable of providing valuable information on the responses of trees and forests to past and present environmental changes, including global warming. We have developed a new technique for aseasonal tropical forest trees which derives their growth rates from xylem Δ14C, and verified its accuracy. We also determined, from xylem δ13C, the intrinsic water-use efficiency (iWUE) in the past 50 years. We analysed changes in xylem Δ14C and δ13C in 23 canopy trees of 12 species in 6 families growing in Pasoh Forest Reserve, Malaysia; each stem diameter at breast height (DBH) was recorded 14 times from 1969 to 2011. We found a significant positive relationship between the growth rates determined by 14C dating and the past DBH data. On the other hand, leaf-internal CO2 (Ci) content did not change with increasing atmospheric CO2 (Ca). Thus, the iWUE increased significantly over the last 50 years in all the families and species tested. This study showed that the simultaneous measurements of xylem Δ14C and δ13C could reveal a long-term change in tree growth and iWUE during the past 50 years with high accuracy in various species and/or individuals in aseasonal tropical rainforests exhibiting high species diversity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Growth analysis based on tree-ring chronology is difficult in trees in aseasonal tropical rain forests, because annual growth rings may be unclear or completely absent. Fortunately, tree growth history recorded in xylem tissue is capable of providing valuable information on the responses of trees and forests to past and present environmental changes, including global warming. We have developed a new technique for aseasonal tropical forest trees which derives their growth rates from xylem Δ14C, and verified its accuracy. We also determined, from xylem δ13C, the intrinsic water-use efficiency (iWUE) in the past 50 years. We analysed changes in xylem Δ14C and δ13C in 23 canopy trees of 12 species in 6 families growing in Pasoh Forest Reserve, Malaysia; each stem diameter at breast height (DBH) was recorded 14 times from 1969 to 2011. We found a significant positive relationship between the growth rates determined by 14C dating and the past DBH data. On the other hand, leaf-internal CO2 (Ci) content did not change with increasing atmospheric CO2 (Ca). Thus, the iWUE increased significantly over the last 50 years in all the families and species tested. This study showed that the simultaneous measurements of xylem Δ14C and δ13C could reveal a long-term change in tree growth and iWUE during the past 50 years with high accuracy in various species and/or individuals in aseasonal tropical rainforests exhibiting high species diversity.
Sakata, Masayuki K., Kawata, Mone U., Kurabayashi, Atsushi, Kurita, Takaki, Nakamura, Masatoshi, Shirako, Tomoyasu, Kakehashi, Ryosuke, Nishikawa, Kanto, Hossman, Mohamad Yazid, Nishijima, Takashi, Kabamoto, Junichi, Miya, Masaki, Minamoto, Toshifumi
Development and evaluation of PCR primers for environmental DNA (eDNA) metabarcoding of Amphibia Journal Article
In: Metabarcoding and Metagenomics, vol. 6, pp. e76534, 2022.
@article{10.3897/mbmg.6.76534,
title = {Development and evaluation of PCR primers for environmental DNA (eDNA) metabarcoding of Amphibia},
author = {Masayuki K. Sakata and Mone U. Kawata and Atsushi Kurabayashi and Takaki Kurita and Masatoshi Nakamura and Tomoyasu Shirako and Ryosuke Kakehashi and Kanto Nishikawa and Mohamad Yazid Hossman and Takashi Nishijima and Junichi Kabamoto and Masaki Miya and Toshifumi Minamoto},
url = {https://doi.org/10.3897/mbmg.6.76534},
doi = {10.3897/mbmg.6.76534},
year = {2022},
date = {2022-01-01},
journal = {Metabarcoding and Metagenomics},
volume = {6},
pages = {e76534},
publisher = {Pensoft Publishers},
abstract = {Biodiversity monitoring is important for the conservation of natural ecosystems in general, but particularly for amphibians, whose populations are pronouncedly declining. However, amphibians’ ecological traits (e.g. nocturnal or aquatic) often prevent their precise monitoring. Environmental DNA (eDNA) metabarcoding – analysis of extra-organismal DNA released into the environment – allows the easy and effective monitoring of the biodiversity of aquatic organisms. Here, we developed and tested the utility of original PCR primer sets. First, we conducted in vitro PCR amplification tests with universal primer candidates using total DNA extracted from amphibian tissues. Five primer sets successfully amplified the target DNA fragments (partial 16S rRNA gene fragments of 160–311 bp) from all 16 taxa tested (from the three living amphibian orders Anura, Caudata and Gymnophiona). Next, we investigated the taxonomic resolution retrieved using each primer set. The results revealed that the universal primer set “Amph16S” had the highest resolution amongst the tested sets. Finally, we applied Amph16S to the water samples collected in the field and evaluated its detection capability by comparing the species detected using eDNA and physical survey (capture-based sampling and visual survey) in multiple agricultural ecosystems across Japan (160 sites in 10 areas). The eDNA metabarcoding with Amph16S detected twice as many species as the physical surveys (16 vs. 8 species, respectively), indicating the effectiveness of Amph16S in biodiversity monitoring and ecological research for amphibian communities.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Biodiversity monitoring is important for the conservation of natural ecosystems in general, but particularly for amphibians, whose populations are pronouncedly declining. However, amphibians’ ecological traits (e.g. nocturnal or aquatic) often prevent their precise monitoring. Environmental DNA (eDNA) metabarcoding – analysis of extra-organismal DNA released into the environment – allows the easy and effective monitoring of the biodiversity of aquatic organisms. Here, we developed and tested the utility of original PCR primer sets. First, we conducted in vitro PCR amplification tests with universal primer candidates using total DNA extracted from amphibian tissues. Five primer sets successfully amplified the target DNA fragments (partial 16S rRNA gene fragments of 160–311 bp) from all 16 taxa tested (from the three living amphibian orders Anura, Caudata and Gymnophiona). Next, we investigated the taxonomic resolution retrieved using each primer set. The results revealed that the universal primer set “Amph16S” had the highest resolution amongst the tested sets. Finally, we applied Amph16S to the water samples collected in the field and evaluated its detection capability by comparing the species detected using eDNA and physical survey (capture-based sampling and visual survey) in multiple agricultural ecosystems across Japan (160 sites in 10 areas). The eDNA metabarcoding with Amph16S detected twice as many species as the physical surveys (16 vs. 8 species, respectively), indicating the effectiveness of Amph16S in biodiversity monitoring and ecological research for amphibian communities.
Piponiot, Camille, Anderson-Teixeira, Kristina J., Davies, Stuart J., Allen, David, Bourg, Norman A., Burslem, David F. R. P., Cárdenas, Dairon, Chang-Yang, Chia-Hao, Chuyong, George, Cordell, Susan, Dattaraja, Handanakere Shivaramaiah, Duque, Álvaro, Ediriweera, Sisira, Ewango, Corneille, Ezedin, Zacky, Filip, Jonah, Giardina, Christian P., Howe, Robert, Hsieh, Chang-Fu, Hubbell, Stephen P., Inman-Narahari, Faith M., Itoh, Akira, Janík, David, Kenfack, David, Král, Kamil, Lutz, James A., Makana, Jean-Remy, McMahon, Sean M., McShea, William, Mi, Xiangcheng, Mohamad, Mohizah Bt., Novotný, Vojtěch, O’Brien, Michael J., Ostertag, Rebecca, Parker, Geoffrey, Pérez, Rolando, Ren, Haibao, Reynolds, Glen, Sabri, Mohamad Danial Md, Sack, Lawren, Shringi, Ankur, Su, Sheng-Hsin, Sukumar, Raman, Sun, I-Fang, Suresh, Hebbalalu S., Thomas, Duncan W., Thompson, Jill, Uriarte, Maria, Vandermeer, John, Wang, Yunquan, Ware, Ian M., Weiblen, George D., Whitfeld, Timothy J. S., Wolf, Amy, Yao, Tze Leong, Yu, Mingjian, Yuan, Zuoqiang, Zimmerman, Jess K., Zuleta, Daniel, Muller-Landau, Helene C.
Distribution of biomass dynamics in relation to tree size in forests across the world Journal Article
In: New Phytologist, vol. 234, no. 5, pp. 1664-1677, 2022.
@article{https://doi.org/10.1111/nph.17995,
title = {Distribution of biomass dynamics in relation to tree size in forests across the world},
author = {Camille Piponiot and Kristina J. Anderson-Teixeira and Stuart J. Davies and David Allen and Norman A. Bourg and David F. R. P. Burslem and Dairon Cárdenas and Chia-Hao Chang-Yang and George Chuyong and Susan Cordell and Handanakere Shivaramaiah Dattaraja and Álvaro Duque and Sisira Ediriweera and Corneille Ewango and Zacky Ezedin and Jonah Filip and Christian P. Giardina and Robert Howe and Chang-Fu Hsieh and Stephen P. Hubbell and Faith M. Inman-Narahari and Akira Itoh and David Janík and David Kenfack and Kamil Král and James A. Lutz and Jean-Remy Makana and Sean M. McMahon and William McShea and Xiangcheng Mi and Mohizah Bt. Mohamad and Vojtěch Novotný and Michael J. O'Brien and Rebecca Ostertag and Geoffrey Parker and Rolando Pérez and Haibao Ren and Glen Reynolds and Mohamad Danial Md Sabri and Lawren Sack and Ankur Shringi and Sheng-Hsin Su and Raman Sukumar and I-Fang Sun and Hebbalalu S. Suresh and Duncan W. Thomas and Jill Thompson and Maria Uriarte and John Vandermeer and Yunquan Wang and Ian M. Ware and George D. Weiblen and Timothy J. S. Whitfeld and Amy Wolf and Tze Leong Yao and Mingjian Yu and Zuoqiang Yuan and Jess K. Zimmerman and Daniel Zuleta and Helene C. Muller-Landau},
url = {https://nph.onlinelibrary.wiley.com/doi/abs/10.1111/nph.17995},
doi = {https://doi.org/10.1111/nph.17995},
year = {2022},
date = {2022-01-01},
journal = {New Phytologist},
volume = {234},
number = {5},
pages = {1664-1677},
abstract = {Summary Tree size shapes forest carbon dynamics and determines how trees interact with their environment, including a changing climate. Here, we conduct the first global analysis of among-site differences in how aboveground biomass stocks and fluxes are distributed with tree size. We analyzed repeat tree censuses from 25 large-scale (4–52 ha) forest plots spanning a broad climatic range over five continents to characterize how aboveground biomass, woody productivity, and woody mortality vary with tree diameter. We examined how the median, dispersion, and skewness of these size-related distributions vary with mean annual temperature and precipitation. In warmer forests, aboveground biomass, woody productivity, and woody mortality were more broadly distributed with respect to tree size. In warmer and wetter forests, aboveground biomass and woody productivity were more right skewed, with a long tail towards large trees. Small trees (1–10 cm diameter) contributed more to productivity and mortality than to biomass, highlighting the importance of including these trees in analyses of forest dynamics. Our findings provide an improved characterization of climate-driven forest differences in the size structure of aboveground biomass and dynamics of that biomass, as well as refined benchmarks for capturing climate influences in vegetation demographic models.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Summary Tree size shapes forest carbon dynamics and determines how trees interact with their environment, including a changing climate. Here, we conduct the first global analysis of among-site differences in how aboveground biomass stocks and fluxes are distributed with tree size. We analyzed repeat tree censuses from 25 large-scale (4–52 ha) forest plots spanning a broad climatic range over five continents to characterize how aboveground biomass, woody productivity, and woody mortality vary with tree diameter. We examined how the median, dispersion, and skewness of these size-related distributions vary with mean annual temperature and precipitation. In warmer forests, aboveground biomass, woody productivity, and woody mortality were more broadly distributed with respect to tree size. In warmer and wetter forests, aboveground biomass and woody productivity were more right skewed, with a long tail towards large trees. Small trees (1–10 cm diameter) contributed more to productivity and mortality than to biomass, highlighting the importance of including these trees in analyses of forest dynamics. Our findings provide an improved characterization of climate-driven forest differences in the size structure of aboveground biomass and dynamics of that biomass, as well as refined benchmarks for capturing climate influences in vegetation demographic models.
Komada, Natsuki, Itioka, Takao, Nakanishi, Akira, Tagane, Shuichiro, Shimizu-kaya, Usun, Nakagawa, Michiko, Meleng, Paulus, Pungga, Runi Sylvester, Kanzaki, Mamoru
Effects of host tree size on the species richness and abundance of epiphyte assemblages in a Bornean lowland tropical forest Journal Article
In: Tropics, vol. 30, no. 4, pp. 53-61, 2022.
@article{NatsukiKomada2022MS21-12,
title = {Effects of host tree size on the species richness and abundance of epiphyte assemblages in a Bornean lowland tropical forest},
author = {Natsuki Komada and Takao Itioka and Akira Nakanishi and Shuichiro Tagane and Usun Shimizu-kaya and Michiko Nakagawa and Paulus Meleng and Runi Sylvester Pungga and Mamoru Kanzaki},
doi = {10.3759/tropics.MS21-12},
year = {2022},
date = {2022-01-01},
journal = {Tropics},
volume = {30},
number = {4},
pages = {53-61},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Diway, Bibian, Yasui, Yasuo, Innan, Hideki, Takeuchi, Yayoi
New locality and bud growth of the world biggest flower, Rafflesia tuan-mudae, in Naha Jaley, Sarawak, Malaysia Journal Article
In: Tropics, vol. 30, no. 4, pp. 71-82, 2022.
@article{BibianDiway2022MS21-14,
title = {New locality and bud growth of the world biggest flower, \textit{Rafflesia tuan-mudae,} in Naha Jaley, Sarawak, Malaysia},
author = {Bibian Diway and Yasuo Yasui and Hideki Innan and Yayoi Takeuchi},
doi = {10.3759/tropics.MS21-14},
year = {2022},
date = {2022-01-01},
journal = {Tropics},
volume = {30},
number = {4},
pages = {71-82},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2019
NORMARK, BENJAMIN B., OKUSU, AKIKO, MORSE, GEOFFREY E., PETERSON, DANIEL A., ITIOKA, TAKAO, SCHNEIDER, SCOTT A.
Phylogeny and classification of armored scale insects (Hemiptera: Coccomorpha: Diaspididae) Journal Article
In: Zootaxa, vol. 4616, no. 1, 2019, ISSN: 1175-5334.
@article{NORMARK2019,
title = {Phylogeny and classification of armored scale insects (Hemiptera: Coccomorpha: Diaspididae)},
author = {BENJAMIN B. NORMARK and AKIKO OKUSU and GEOFFREY E. MORSE and DANIEL A. PETERSON and TAKAO ITIOKA and SCOTT A. SCHNEIDER},
doi = {10.11646/zootaxa.4616.1.1},
issn = {1175-5334},
year = {2019},
date = {2019-06-17},
journal = {Zootaxa},
volume = {4616},
number = {1},
publisher = {Magnolia Press},
abstract = {Armored scale insects (Hemiptera: Coccomorpha: Diaspididae) are major economic pests and are among the world's most invasive species. Here we describe a system of specimen and identification management that establishes a basis for well-vouchered molecular identification. We also present an expanded Bayesian phylogenetic analysis based on concatenated fragments of 4 genetic loci: the large ribosomal subunit (28S), elongation factor-1 alpha (EF-1α), cytochrome oxidase I and II (COI‒II), and the small ribosomal subunit (16S) of the primary endosymbiont, Uzinura diaspidicola (Bacteroidetes: Flavobacteriales). Our sample includes 1,389 individuals, representing 11 outgroup species and at least 311 described and 61 undescribed diaspidid species. The results broadly support Takagi's 2002 classification but indicate that some revisions are needed. We propose a revised classification recognizing 4 subfamilies: Ancepaspidinae Borchsenius, new rank, Furcaspidinae Balachowsky, new rank, Diaspidinae Targioni Tozzetti, and Aspidiotinae Westwood. Within Aspidiotinae, in addition to the existing tribes Aspidiotini Westwood, Parlatoriini Leonardi, Odonaspidini Ferris, Leucaspidini Atkinson, and Smilacicolini Takagi, we recognize as tribes Gymnaspidini Balachowsky, new rank, and Aonidiini Balachowsky, new rank. Within Diaspidinae we recognize the 2 tribes Lepidosaphidini Shimer and Diaspidini Targioni Tozzetti, and within Diaspidini we recognize three subtribes: Diaspidina Targioni Tozzetti, Fioriniina Leonardi, and Chionaspidina Brues & Melander. We regard Kuwanaspidina Borchsenius as a junior synonym of Fioriniina, Thysanaspidini Takagi as a junior synonym of Leucaspidini, and Protodiaspidina Takagi and Ulucoccinae Takagi as junior synonyms of Chionaspidina. To clarify the composition of the higher taxa we describe 2 new genera for Australian species heretofore misplaced in the genus Ancepaspis Ferris: Brimblecombia Normark (Aonidiini) and Hendersonaspis Normark (Leucaspidini). We also propose many additional minor modifications to the taxonomy of Diaspididae, including the following new combinations, revived combinations, and replacement names: Aonidia edgerleyi (Mamet), new combination (from Bigymnaspis Balachowsky); Aonidomytilus espinosai Porter, revived combination (from Porterinaspis González); Aspidiotus badius (Brain), new combination (this and the next 5 Aspidiotus species all from Aonidia Targioni Tozzetti); Aspidiotus biafrae (Lindinger), new combination; Aspidiotus chaetachmeae (Brain), new combination; Aspidiotus laticornis (Balachowsky), new combination; Aspidiotus rhusae (Brain), new combination; Aspidiotus sclerosus (Munting), new combination; Brimblecombia asperata (Brimblecombe), new combination (this and the next 5 Brimblecombia species all from Ancepaspis); Brimblecombia longicauda (Brimblecombe), new combination; Brimblecombia magnicauda (Brimblecombe), new combination; Brimblecombia reticulata (Brimblecombe), new combination; Brimblecombia rotundicauda (Brimblecombe), new combination; Brimblecombia striata (Brimblecombe), new combination; Cooleyaspis pseudomorpha (Leonardi), new combination (from Dinaspis Leonardi); Cupidaspis wilkeyi (Howell & Tippins), new combination (from Paracupidaspis Howell & Tippins); Cupressaspis isfarensis Borchsenius, revived combination (this species, the next 2 species in Cupressaspis Borchsenius, revived genus, and the next 9 species in Diaspidiotus Cockerell all from Aonidia); Cupressaspis mediterranea (Lindinger), revived combination; Cupressaspis relicta (Balachowsky), new combination; Diaspidiotus atlanticus (Ferris), new combination; Diaspidiotus marginalis (Brain), new combination; Diaspidiotus maroccanus (Balachowsky), new combination; Diaspidiotus mesembryanthemae (Brain), new combination; Diaspidiotus opertus (De Lotto), new combination; Diaspidiotus shastae (Coleman), new combination; Diaspidiotus simplex (Leonardi), new combination; Diaspidiotus visci (Hall), new combination; Diaspidiotus yomae (Munting), new combination; Diaspis arundinariae (Tippins & Howell), new combination (from Geodiaspis Tippins & Howell); Duplachionaspis arecibo (Howell), new combination (this and the next 10 Duplachionaspis MacGillivray species all from Haliaspis Takagi); Duplachionaspis asymmetrica Ferris, revived combination; Duplachionaspis distichlii (Ferris), revived combination; Duplachionaspis litoralis Ferris, revived combination; Duplachionaspis mackenziei McDaniel, revived combination; Duplachionaspis milleri (Howell), new combination; Duplachionaspis nakaharai (Howell), new combination; Duplachionaspis peninsularis (Howell), new combination; Duplachionaspis spartinae (Comstock), revived combination; Duplachionaspis texana (Liu & Howell) new combination; Duplachionaspis uniolae (Takagi), new combination; Duplachionaspis mutica (Williams) (from Aloaspis Williams), new combination; Epidiaspis doumtsopi (Schneider), new combination (from Diaspis Costa); Fiorinia ficicola (Takahashi), new combination (from Ichthyaspis Takagi); Fiorinia macroprocta (Leonardi), revived combination (this and the next 2 species of Fiorinia Targioni Tozzetti all from Trullifiorinia Leonardi); Fiorinia rubrolineata Leonardi, revived combination; Fiorinia scrobicularum Green, revived combination; Genaparlatoria pseudaspidiotus (Lindinger), revived combination (from Parlatoria); Greeniella acaciae (Froggatt), new combination (this and the next 4 Greeniella Cockerell species all from Gymnaspis Newstead); Greeniella cassida (Hall & Williams), new combination; Greeniella grandis (Green), new combination; Greeniella perpusilla (Maskell), new combination; Greeniella serrata (Froggatt), new combination; Hendersonaspis anomala (Green), new combination (from Ancepaspis); Hulaspis bulba (Munting), new combination (this and the next Hulaspis Hall species both from Andaspis MacGillivray); Hulaspis formicarum (Ben-Dov), new combination; Lepidosaphes antidesmae (Rao in Rao & Ferris), new combination (this and the next 19 species all from Andaspis); Lepidosaphes arcana (Matile-Ferrero), new combination; Lepidosaphes betulae (Borchsenius), new combination; Lepidosaphes citricola (Young & Hu), new combination; Lepidosaphes conocarpi (Takagi), new combination; Lepidosaphes crawi (Cockerell), revived combination; Lepidosaphes erythrinae Rutherford, revived combination; Lepidosaphes incisor Green, revived combination; Lepidosaphes indica (Borchsenius), new combination; Lepidosaphes kashicola Takahashi, revived combination; Lepidosaphes kazimiae (Williams), new combination; Lepidosaphes laurentina (Almeida), new combination; Lepidosaphes maai (Williams & Watson), new combination; Lepidosaphes mackieana McKenzie, revived combination; Lepidosaphes micropori (Borchsenius), new combination; Lepidosaphes punicae Laing, revived combination; Lepidosaphes quercicola (Borchsenius), new combination; Lepidosaphes recurrens (Takagi & Kawai), new combination; Lepidosaphes viticis (Takagi), new combination; Lepidosaphes xishuanbannae (Young & Hu), new combination; Lepidosaphes giffardi (Adachi & Fullaway), new combination (from Carulaspis MacGillivray); Lepidosaphes garciniae (Young & Hu), new combination (this and the next 2 species all from Ductofrontaspis Young & Hu); Lepidosaphes huangyangensis (Young & Hu), new combination; Lepidosaphes jingdongensis (Young & Hu), new combination; Lepidosaphes recurvata (Froggatt), revived combination (from Metandaspis Williams); Lepidosaphes ficicola Takahashi, revived combination (this and the next 2 species all from Ungulaspis MacGillivray); Lepidosaphes pinicolous Chen, revived combination; Lepidosaphes ungulata Green, revived combination; Lepidosaphes serrulata (Ganguli), new combination (from Velataspis Ferris); Lepidosaphes huyoung Normark, replacement name for Andaspis ficicola Young & Hu; Lepidosaphes tangi Normark, replacement name for Andaspis schimae Tang; Lepidosaphes yuanfeng Normark, replacement name for Andaspis keteleeriae Yuan & Feng; Leucaspis ilicitana (Gómez-Menor), new combination (from Aonidia); Lopholeucaspis spinomarginata (Green), new combination (from Gymnaspis); Melanaspis campylanthi (Lindinger), new combination (from Aonidia); Mohelnaspis bidens (Green), new combination (from Fiorinia); Parlatoria affinis (Ramakrishna Ayyar), new combination (this and the next 4 Parlatoria species all from Gymnaspis); Parlatoria ficus (Ramakrishna Ayyar), new combination; Parlatoria mangiferae (Ramakrishna Ayyar), new combination; Parlatoria ramakrishnai (Green), new combination; Parlatoria sclerosa (Munting), new combination; Parlatoria bullata (Green), new combination (from Bigymnaspis); Parlatoria leucaspis (Lindinger), new combination (this and the next species both from Cryptoparlatorea Lindinger); Parlatoria pini (Takahashi), new combination; Parlatoria tangi Normark, replacement name for Parlatoria pini Tang; Pseudoparlatoria bennetti (Williams), new combination (from Parlagena McKenzie); Pseudoparlatoria chinchonae (McKenzie), new combination (from Protodiaspis Cockerell); Pseudoparlatoria larreae (Leonardi), revived combination (from Protargionia Leonardi); Quernaspis lepineyi (Balachowsky), new combination (from Chionaspis); Rhizaspidiotus nullispinus (Munting), new combination (from Aonidia); Rolaspis marginalis (Leonardi), new combination (from Lepidosaphes); Salicicola lepelleyi (De Lotto), new combination (from Anotaspis Ferris); Tecaspis giffardi (Leonardi), new combination (from Dinaspis); Trullifiorinia geijeriae (Froggatt), new combination (from Fiorinia); Trullifiorinia nigra (Lindinger), new combination (from Crypthemichionaspis Lindinger); and Voraspis olivina (Leonardi), new combination (from Lepidosaphes). },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2018
Hyodo, Fujio, Yamasaki, Takeshi, Iwasa, Takuya, Itioka, Takao, Endo, Tomoji, Hashimoto, Yoshiaki
Stable isotope analysis reveals the importance of plant-based diets for tropical ant-mimicking spiders Journal Article
In: Entomological Science, vol. 21, no. 4, pp. 461-468, 2018.
@article{https://doi.org/10.1111/ens.12331,
title = {Stable isotope analysis reveals the importance of plant-based diets for tropical ant-mimicking spiders},
author = {Fujio Hyodo and Takeshi Yamasaki and Takuya Iwasa and Takao Itioka and Tomoji Endo and Yoshiaki Hashimoto},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/ens.12331},
doi = {https://doi.org/10.1111/ens.12331},
year = {2018},
date = {2018-01-01},
journal = {Entomological Science},
volume = {21},
number = {4},
pages = {461-468},
abstract = {Abstract Ant-mimicking spiders are a well-known example of Batesian mimicry. Earlier studies have proposed that plant-based diets (e.g. extrafloral nectar) are an important food source for ant-mimicking spiders. However, it is still unclear whether the plant-based diets are a main food source or supplementary energy source to the spiders. To examine the feeding habits, we measured stable nitrogen and carbon isotope ratios (δ15N and δ13C) of ant-mimicking spiders (six species of Myrmarachne; one species of Agorius, Salticidae; and two species of Corinnidae) collected from a tropical rain forest in Malaysia and a dry evergreen forest in Thailand. We also investigated the isotopic signatures of several ant species sampled from the two forests for comparison. In general, the ant-mimicking spiders had relatively low δ15N values, which were comparable to those of the nectar-feeding and omnivorous ants. The δ15N values of the ant-mimicking spiders differed significantly among the species: some species (e.g. Myrmarachne sp. H and Myrmarachne sp. 2) showed δ15N values similar to those of the nectar-feeding ants, whereas the δ15N values of others (e.g. Myrmarachne maxillosa and Myrmarachne malayana) were close to those of the omnivorous ants. The δ13C values of the ant-mimicking spiders did not differ significantly among the species, but tended to be similar to those of the nectar- and honeydew-feeding ants rather than the predatory ants. These results indicate that plant-based diets are important for the nutrition of ant-mimicking spiders and suggest that the importance would differ among the ant-mimicking spider species.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Ant-mimicking spiders are a well-known example of Batesian mimicry. Earlier studies have proposed that plant-based diets (e.g. extrafloral nectar) are an important food source for ant-mimicking spiders. However, it is still unclear whether the plant-based diets are a main food source or supplementary energy source to the spiders. To examine the feeding habits, we measured stable nitrogen and carbon isotope ratios (δ15N and δ13C) of ant-mimicking spiders (six species of Myrmarachne; one species of Agorius, Salticidae; and two species of Corinnidae) collected from a tropical rain forest in Malaysia and a dry evergreen forest in Thailand. We also investigated the isotopic signatures of several ant species sampled from the two forests for comparison. In general, the ant-mimicking spiders had relatively low δ15N values, which were comparable to those of the nectar-feeding and omnivorous ants. The δ15N values of the ant-mimicking spiders differed significantly among the species: some species (e.g. Myrmarachne sp. H and Myrmarachne sp. 2) showed δ15N values similar to those of the nectar-feeding ants, whereas the δ15N values of others (e.g. Myrmarachne maxillosa and Myrmarachne malayana) were close to those of the omnivorous ants. The δ13C values of the ant-mimicking spiders did not differ significantly among the species, but tended to be similar to those of the nectar- and honeydew-feeding ants rather than the predatory ants. These results indicate that plant-based diets are important for the nutrition of ant-mimicking spiders and suggest that the importance would differ among the ant-mimicking spider species.
Iku, Asano, Itioka, Takao, Kawakita, Atsushi, Goto, Hideaki, Ueda, Akira, Shimizu-kaya, Usun, Meleng, Paulus
In: Tropics, vol. 27, no. 3, pp. 59-66, 2018, ISSN: 0917415X.
@article{1390282763072014976,
title = {High degree of polyphagy in a seed-eating bark beetle, \textit{Coccotrypes gedeanus} (Coleoptera: Curculionidae: Scolytinae), during a community-wide fruiting event in a Bornean tropical rainforest},
author = {Asano Iku and Takao Itioka and Atsushi Kawakita and Hideaki Goto and Akira Ueda and Usun Shimizu-kaya and Paulus Meleng},
url = {https://cir.nii.ac.jp/crid/1390282763072014976},
doi = {10.3759/tropics.ms18-07},
issn = {0917415X},
year = {2018},
date = {2018-01-01},
journal = {Tropics},
volume = {27},
number = {3},
pages = {59-66},
publisher = {JAPAN SOCIETY OF TROPICAL ECOLOGY},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2017
Asano, Iku, Takao, Itioka, Keiko, Kishimoto-Yamada, Usun, Shimizu-kaya, Mohammad, Fatimah Bte, Hossman, Mohamad Yazid, Azimah, Bunyok, Rahman, Mohd Yusuf Abd, Shoko, Sakai, Paulus, Meleng
Increased seed predation in the second fruiting event during an exceptionally long period of community-level masting in Borneo Journal Article
In: Ecological research, vol. 32, no. 4, pp. 537-545, 2017, ISSN: 09123814.
@article{1520010380464400128,
title = {Increased seed predation in the second fruiting event during an exceptionally long period of community-level masting in Borneo},
author = {Iku Asano and Itioka Takao and Kishimoto-Yamada Keiko and Shimizu-kaya Usun and Fatimah Bte Mohammad and Mohamad Yazid Hossman and Bunyok Azimah and Mohd Yusuf Abd Rahman and Sakai Shoko and Meleng Paulus},
url = {https://cir.nii.ac.jp/crid/1520010380464400128},
doi = {10.1007/s11284-017-1465-0},
issn = {09123814},
year = {2017},
date = {2017-01-01},
journal = {Ecological research},
volume = {32},
number = {4},
pages = {537-545},
publisher = {Tokyo : Springer Japan},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2016
Shimizu-kaya, Usun, Okubo, Tadahiro, Itioka, Takao
A bioassay for measuring the intensities of ant defenses on Macaranga myrmecophytes Journal Article
In: Tropics, vol. 25, no. 3, pp. 101-106, 2016.
@article{UsunShimizu-kaya2016MS15-19,
title = {A bioassay for measuring the intensities of ant defenses on \textit{Macaranga }myrmecophytes},
author = {Usun Shimizu-kaya and Tadahiro Okubo and Takao Itioka},
doi = {10.3759/tropics.MS15-19},
year = {2016},
date = {2016-01-01},
journal = {Tropics},
volume = {25},
number = {3},
pages = {101-106},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Yamashita, Satoshi, Hirose, Dai
In: Fungal Ecology, vol. 24, pp. 1-6, 2016, ISSN: 1754-5048.
@article{YAMASHITA20161,
title = {Phylogenetic analysis of Ganoderma australe complex in a Bornean tropical rainforest and implications for mechanism of coexistence of various phylogenetic types},
author = {Satoshi Yamashita and Dai Hirose},
url = {https://www.sciencedirect.com/science/article/pii/S1754504816300289},
doi = {https://doi.org/10.1016/j.funeco.2016.04.006},
issn = {1754-5048},
year = {2016},
date = {2016-01-01},
journal = {Fungal Ecology},
volume = {24},
pages = {1-6},
abstract = {We hypothesized that different phylogenetic types of the Ganoderma australe complex can coexist and that their coexistence is promoted by resource partitioning among them. Our field survey and phylogenetic analysis revealed six phylogenetic types coexisting within a 3 ha primary forest plot in a Bornean tropical rainforest. Two of the six have been reported previously, whereas the remaining four are new. Fruit bodies of all dominant phylogenetic types appeared more frequently from fresh coarse woody debris than expected. Comparison of resource use patterns between the observed fungal community and the null community did not provide significant evidence of niche partitioning. Although we found high genetic diversity within the plot, the phylogenetic types at the site share resources. Resource partitioning on phylogenetic types of host trees or stochastic processes during colonization of pieces of coarse woody debris might play an important role in forming the community structure of phylogenetic types of G. australe.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We hypothesized that different phylogenetic types of the Ganoderma australe complex can coexist and that their coexistence is promoted by resource partitioning among them. Our field survey and phylogenetic analysis revealed six phylogenetic types coexisting within a 3 ha primary forest plot in a Bornean tropical rainforest. Two of the six have been reported previously, whereas the remaining four are new. Fruit bodies of all dominant phylogenetic types appeared more frequently from fresh coarse woody debris than expected. Comparison of resource use patterns between the observed fungal community and the null community did not provide significant evidence of niche partitioning. Although we found high genetic diversity within the plot, the phylogenetic types at the site share resources. Resource partitioning on phylogenetic types of host trees or stochastic processes during colonization of pieces of coarse woody debris might play an important role in forming the community structure of phylogenetic types of G. australe.
Nagai, Shin, Ichie, Tomoaki, Yoneyama, Aogu, Kobayashi, Hideki, Inoue, Tomoharu, Ishii, Reiichiro, Suzuki, Rikie, Itioka, Takao
Usability of time-lapse digital camera images to detect characteristics of tree phenology in a tropical rainforest Journal Article
In: Ecological Informatics, vol. 32, pp. 91-106, 2016, ISSN: 1574-9541.
@article{NAGAI201691,
title = {Usability of time-lapse digital camera images to detect characteristics of tree phenology in a tropical rainforest},
author = {Shin Nagai and Tomoaki Ichie and Aogu Yoneyama and Hideki Kobayashi and Tomoharu Inoue and Reiichiro Ishii and Rikie Suzuki and Takao Itioka},
url = {https://www.sciencedirect.com/science/article/pii/S1574954116300012},
doi = {https://doi.org/10.1016/j.ecoinf.2016.01.006},
issn = {1574-9541},
year = {2016},
date = {2016-01-01},
journal = {Ecological Informatics},
volume = {32},
pages = {91-106},
abstract = {We evaluated the usability of the red (R), green (G), and blue (B) digital numbers (DNRGB) extracted from daily phenological images of a tropical rainforest in Malaysian Borneo. We examined temporal patterns in the proportions of DNR, DNG, and DNB as percentages of total DN (denoted as %R, %G and %B), in the hue, saturation, and lightness values in the HSL color model, and in a green excess index (GEI) of the whole canopy and of individual trees for 2years. We also examined temporal patterns in the proportions of the red, green, and blue reflectance of the whole canopy surface as percentages of total reflectance (denoted as %ref_R, %ref_G, and %ref_B), and vegetation indices (the normalized-difference vegetation index, enhanced vegetation index, and green–red vegetation index) of the whole canopy by using daily measurements from quantum sensors. The temporal patterns of %RGB and saturation of individual trees revealed the characteristics of tree phenology caused by flowering, coloring, and leaf flushing. In contrast, those of the whole canopy did not, nor did those of %ref_R, %ref_G, or %ref_B, or the vegetation indices. The temporal patterns of GEI, however, could detect differences among individual trees caused by leaf flushing and coloring. Our results show the importance of installing multiple time-lapse digital cameras in tropical rainforests to accurately evaluate the sensitivity of tree phenology to meteorological and climatic changes. However, more work needs to be done to adequately describe whole-canopy changes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We evaluated the usability of the red (R), green (G), and blue (B) digital numbers (DNRGB) extracted from daily phenological images of a tropical rainforest in Malaysian Borneo. We examined temporal patterns in the proportions of DNR, DNG, and DNB as percentages of total DN (denoted as %R, %G and %B), in the hue, saturation, and lightness values in the HSL color model, and in a green excess index (GEI) of the whole canopy and of individual trees for 2years. We also examined temporal patterns in the proportions of the red, green, and blue reflectance of the whole canopy surface as percentages of total reflectance (denoted as %ref_R, %ref_G, and %ref_B), and vegetation indices (the normalized-difference vegetation index, enhanced vegetation index, and green–red vegetation index) of the whole canopy by using daily measurements from quantum sensors. The temporal patterns of %RGB and saturation of individual trees revealed the characteristics of tree phenology caused by flowering, coloring, and leaf flushing. In contrast, those of the whole canopy did not, nor did those of %ref_R, %ref_G, or %ref_B, or the vegetation indices. The temporal patterns of GEI, however, could detect differences among individual trees caused by leaf flushing and coloring. Our results show the importance of installing multiple time-lapse digital cameras in tropical rainforests to accurately evaluate the sensitivity of tree phenology to meteorological and climatic changes. However, more work needs to be done to adequately describe whole-canopy changes.
Yamasaki, Takeshi, Hashimoto, Yoshiaki, Endo, Tomoji, Hyodo, Fujio, Itioka, Takao
A new species of the genus Castoponera (Araneae, Corinnidae) from Sarawak, Borneo, with comparison to a related species Journal Article
In: ZooKeys, vol. 596, pp. 13-25, 2016, ISSN: 1313-2970.
@article{1050564285802541568,
title = {A new species of the genus Castoponera (Araneae, Corinnidae) from Sarawak, Borneo, with comparison to a related species},
author = {Takeshi Yamasaki and Yoshiaki Hashimoto and Tomoji Endo and Fujio Hyodo and Takao Itioka},
url = {https://cir.nii.ac.jp/crid/1050564285802541568},
issn = {1313-2970},
year = {2016},
date = {2016-01-01},
journal = {ZooKeys},
volume = {596},
pages = {13-25},
publisher = {Pensoft Publishers},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2015
Inoue, Y., Kenzo, T., Tanaka-Oda, A., Yoneyama, A., Ichie, T.
Leaf water use in heterobaric and homobaric leafed canopy tree species in a Malaysian tropical rain forest Journal Article
In: Photosynthetica, vol. 53, no. 2, pp. 177–186, 2015, ISSN: 03003604.
@article{phs-201502-0003,
title = {Leaf water use in heterobaric and homobaric leafed canopy tree species in a Malaysian tropical rain forest},
author = {Y. Inoue and T. Kenzo and A. Tanaka-Oda and A. Yoneyama and T. Ichie},
url = {https://doi.org/10.1007/s11099-015-0105-6},
doi = {10.1007/s11099-015-0105-6},
issn = {03003604},
year = {2015},
date = {2015-01-01},
journal = {Photosynthetica},
volume = {53},
number = {2},
pages = {177–186},
abstract = {Tropical canopy tree species can be classified into two types by their heterobaric and homobaric leaves. We studied the relation between both leaf types and their water use, together with the morphological characteristics of leaves and xylem, in 23 canopy species in a tropical rain forest. The maximum rates of photosynthesis and transpiration were significantly higher in heterobaric leaf species, which also underwent larger diurnal variations of leaf water potential compared to homobaric leaf species. The vessel diameter was significantly larger and the stomatal pore index (SPI) was significantly higher in heterobaric than that in homobaric leaf species. There was a significant positive correlation between the vessel diameter, SPI, and maximum transpiration rates in all the studied species of both leaf types. However, there was no significant difference in other properties, such as leaf water-use efficiency, leaf mass per area, leaf nitrogen content, and leaf δ^{13}C between heterobaric and homobaric leaf species. Our results indicate that leaf and xylem morphological differences between heterobaric and homobaric leaf species are closely related to leaf water-use characteristics, even in the same habitat: heterobaric leaf species achieved a high carbon gain with large water use under strong light conditions, whereas homobaric leaf species can maintain a high leaf water potential even at midday as a result of low water use in the canopy environment.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tropical canopy tree species can be classified into two types by their heterobaric and homobaric leaves. We studied the relation between both leaf types and their water use, together with the morphological characteristics of leaves and xylem, in 23 canopy species in a tropical rain forest. The maximum rates of photosynthesis and transpiration were significantly higher in heterobaric leaf species, which also underwent larger diurnal variations of leaf water potential compared to homobaric leaf species. The vessel diameter was significantly larger and the stomatal pore index (SPI) was significantly higher in heterobaric than that in homobaric leaf species. There was a significant positive correlation between the vessel diameter, SPI, and maximum transpiration rates in all the studied species of both leaf types. However, there was no significant difference in other properties, such as leaf water-use efficiency, leaf mass per area, leaf nitrogen content, and leaf δ13C between heterobaric and homobaric leaf species. Our results indicate that leaf and xylem morphological differences between heterobaric and homobaric leaf species are closely related to leaf water-use characteristics, even in the same habitat: heterobaric leaf species achieved a high carbon gain with large water use under strong light conditions, whereas homobaric leaf species can maintain a high leaf water potential even at midday as a result of low water use in the canopy environment.
Katayama, Motoki, Kishimoto-Yamada, Keiko, Tanaka, Hiroshi O., Endo, Tomoji, Hashimoto, Yoshiaki, Yamane, Seiki, Itioka, Takao
Negative Correlation between Ant and Spider Abundances in the Canopy of a Bornean Tropical Rain Forest Journal Article
In: Biotropica, vol. 47, no. 3, pp. 363-368, 2015.
@article{https://doi.org/10.1111/btp.12208,
title = {Negative Correlation between Ant and Spider Abundances in the Canopy of a Bornean Tropical Rain Forest},
author = {Motoki Katayama and Keiko Kishimoto-Yamada and Hiroshi O. Tanaka and Tomoji Endo and Yoshiaki Hashimoto and Seiki Yamane and Takao Itioka},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/btp.12208},
doi = {https://doi.org/10.1111/btp.12208},
year = {2015},
date = {2015-01-01},
journal = {Biotropica},
volume = {47},
number = {3},
pages = {363-368},
abstract = {Abstract In tropical rain forests, high canopy trees have diverse and abundant populations of ants and spiders. However, accessing high trees and their fauna remains difficult; thus, how ants and spiders interact in the canopy remains unclear. To better understand the interspecific interactions between these two dominant arthropod groups, we investigated their spatial distributions at the canopy surface in a tropical rain forest in Borneo. We sampled ants and spiders six times between 2009 and 2011 by sweeping with an insect net at the tree crown surfaces of 190 emergent or tall (≥20 m in height) trees. We collected 438 ant individuals belonging to 94 species and 1850 spider individuals (1630 juveniles and 220 adults) belonging to 142 morphospecies (adults only) from a total of 976 samples. The fact that we collected four times more spider individuals than ant individuals suggests that fewer ants forage at the tree crown surface than previously thought. The number of spider individuals negatively correlated with the number of ant individuals and the number of ant species, indicating significant exclusivity between ant and spider spatial distributions at the tree crown surface. Niche-overlap between the two taxa confirmed this observation. Although our data do not address the causes of these spatial distributions, antagonistic interspecific interactions such as interference behaviors and intra-guild predation are ecological mechanisms that give rise to exclusive spatial distributions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract In tropical rain forests, high canopy trees have diverse and abundant populations of ants and spiders. However, accessing high trees and their fauna remains difficult; thus, how ants and spiders interact in the canopy remains unclear. To better understand the interspecific interactions between these two dominant arthropod groups, we investigated their spatial distributions at the canopy surface in a tropical rain forest in Borneo. We sampled ants and spiders six times between 2009 and 2011 by sweeping with an insect net at the tree crown surfaces of 190 emergent or tall (≥20 m in height) trees. We collected 438 ant individuals belonging to 94 species and 1850 spider individuals (1630 juveniles and 220 adults) belonging to 142 morphospecies (adults only) from a total of 976 samples. The fact that we collected four times more spider individuals than ant individuals suggests that fewer ants forage at the tree crown surface than previously thought. The number of spider individuals negatively correlated with the number of ant individuals and the number of ant species, indicating significant exclusivity between ant and spider spatial distributions at the tree crown surface. Niche-overlap between the two taxa confirmed this observation. Although our data do not address the causes of these spatial distributions, antagonistic interspecific interactions such as interference behaviors and intra-guild predation are ecological mechanisms that give rise to exclusive spatial distributions.
Kishimoto-Yamada, Keiko, Itioka, Takao
How much have we learned about seasonality in tropical insect abundance since Wolda (1988)? Journal Article
In: Entomological Science, vol. 18, no. 4, pp. 407-419, 2015.
@article{https://doi.org/10.1111/ens.12134,
title = {How much have we learned about seasonality in tropical insect abundance since Wolda (1988)?},
author = {Keiko Kishimoto-Yamada and Takao Itioka},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/ens.12134},
doi = {https://doi.org/10.1111/ens.12134},
year = {2015},
date = {2015-01-01},
journal = {Entomological Science},
volume = {18},
number = {4},
pages = {407-419},
abstract = {Abstract Seasonal patterns in climatic conditions affect the life cycles and temporal patterns in the abundance of most temperate insect species. In tropical regions where there is no winter season, the situation may be different. For a better understanding of the evolution of seasonal life cycles, and the dynamics affecting temporal patterns in abundance of tropical insect populations and assemblages, it is important to study the life cycles of tropical insects and the presence or absence of seasonality in relation to climatic conditions. By reviewing studies on temporal patterns of abundance, this article examines the patterns of seasonality in adult tropical forest insects and discusses the variation in such patterns in various forest types. Seasonal and aseasonal patterns were found to be common in tropical dry and wet regions, respectively. In wet regions, which lack a distinctive dry season, there exists a wide variety of temporal patterns in addition to aseasonal patterns: distinctively seasonal and supra-annual fluctuations in some insect species. Some of the problems of hidden ecological mechanisms underlying seasonal patterns in abundance are discussed, and the definition of seasonality in temporal patterns of insect abundance at a particular stage in the life cycle is considered. Methodological problems are also discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Seasonal patterns in climatic conditions affect the life cycles and temporal patterns in the abundance of most temperate insect species. In tropical regions where there is no winter season, the situation may be different. For a better understanding of the evolution of seasonal life cycles, and the dynamics affecting temporal patterns in abundance of tropical insect populations and assemblages, it is important to study the life cycles of tropical insects and the presence or absence of seasonality in relation to climatic conditions. By reviewing studies on temporal patterns of abundance, this article examines the patterns of seasonality in adult tropical forest insects and discusses the variation in such patterns in various forest types. Seasonal and aseasonal patterns were found to be common in tropical dry and wet regions, respectively. In wet regions, which lack a distinctive dry season, there exists a wide variety of temporal patterns in addition to aseasonal patterns: distinctively seasonal and supra-annual fluctuations in some insect species. Some of the problems of hidden ecological mechanisms underlying seasonal patterns in abundance are discussed, and the definition of seasonality in temporal patterns of insect abundance at a particular stage in the life cycle is considered. Methodological problems are also discussed.
Hyodo, Fujio, Matsumoto, Takashi, Takematsu, Yoko, Itioka, Takao
Dependence of diverse consumers on detritus in a tropical rain forest food web as revealed by radiocarbon analysis Journal Article
In: Functional Ecology, vol. 29, no. 3, pp. 423-429, 2015.
@article{https://doi.org/10.1111/1365-2435.12357,
title = {Dependence of diverse consumers on detritus in a tropical rain forest food web as revealed by radiocarbon analysis},
author = {Fujio Hyodo and Takashi Matsumoto and Yoko Takematsu and Takao Itioka},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/1365-2435.12357},
doi = {https://doi.org/10.1111/1365-2435.12357},
year = {2015},
date = {2015-01-01},
journal = {Functional Ecology},
volume = {29},
number = {3},
pages = {423-429},
abstract = {Summary Energy and material flows from dead organic matter, or detritus, to generalist predators have a potential impact on the food web dynamics. However, little is known about how commonly generalist predators depend on detritivorous prey, or the detritus on which the detritivores have fed in terrestrial food webs. To examine this, we measured the diet ages of terrestrial invertebrate and vertebrate consumers (>30 species) at multiple trophic levels in a tropical rain forest, with a particular focus on ants and termites by using radiocarbon (14C). Here, we defined diet age as the lag time between the primary production and the utilization by consumer organisms. The diet ages varied from 0 to >50 years and corresponded to known feeding habits of the consumers. Herbivores such as bees, butterflies, a frugivorous bird and bat, and nectar-feeding ants had young diet ages (0–3 years). Meanwhile, detritivores such as termites had old diet ages, which increased according to the food resources in the order of litter (6 years), soil (10 years) and wood (≥19 years). The diet ages of predators such as wolf spiders, hunting wasps, army ants, tree shrews and an insectivorous bat were intermediate (2–8 years), indicating the dependence of many predators on detritivores. Because known dietary components of the predators include herbivores and detritivores, the intermediate ages likely indicate the coupling of energy and material flows between plant-based and detritus-based food webs. Diet ages of soil-feeding termite and army ant differed significantly, although a previous study reported that their nitrogen isotope ratios were indistinguishable despite the differing feeding habits. This indicates that radiocarbon can distinguish the two factors, trophic enrichment and the below-ground processes (humification), both of which could influence the nitrogen isotopic signatures of the terrestrial consumers. Our results show that radiocarbon would provide insights into structures of terrestrial food webs as well as time frame of energy and material flows through the webs.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Summary Energy and material flows from dead organic matter, or detritus, to generalist predators have a potential impact on the food web dynamics. However, little is known about how commonly generalist predators depend on detritivorous prey, or the detritus on which the detritivores have fed in terrestrial food webs. To examine this, we measured the diet ages of terrestrial invertebrate and vertebrate consumers (>30 species) at multiple trophic levels in a tropical rain forest, with a particular focus on ants and termites by using radiocarbon (14C). Here, we defined diet age as the lag time between the primary production and the utilization by consumer organisms. The diet ages varied from 0 to >50 years and corresponded to known feeding habits of the consumers. Herbivores such as bees, butterflies, a frugivorous bird and bat, and nectar-feeding ants had young diet ages (0–3 years). Meanwhile, detritivores such as termites had old diet ages, which increased according to the food resources in the order of litter (6 years), soil (10 years) and wood (≥19 years). The diet ages of predators such as wolf spiders, hunting wasps, army ants, tree shrews and an insectivorous bat were intermediate (2–8 years), indicating the dependence of many predators on detritivores. Because known dietary components of the predators include herbivores and detritivores, the intermediate ages likely indicate the coupling of energy and material flows between plant-based and detritus-based food webs. Diet ages of soil-feeding termite and army ant differed significantly, although a previous study reported that their nitrogen isotope ratios were indistinguishable despite the differing feeding habits. This indicates that radiocarbon can distinguish the two factors, trophic enrichment and the below-ground processes (humification), both of which could influence the nitrogen isotopic signatures of the terrestrial consumers. Our results show that radiocarbon would provide insights into structures of terrestrial food webs as well as time frame of energy and material flows through the webs.
2014
Yamasaki, Eri, Inui, Yoko, Sakai, Shoko
In: Plant Species Biology, vol. 29, no. 3, pp. 232-241, 2014.
@article{https://doi.org/10.1111/1442-1984.12015,
title = {Production of food bodies on the reproductive organs of myrmecophytic acaranga species (Euphorbiaceae): effects on interactions with herbivores and pollinators},
author = {Eri Yamasaki and Yoko Inui and Shoko Sakai},
url = {https://esj-journals.onlinelibrary.wiley.com/doi/abs/10.1111/1442-1984.12015},
doi = {https://doi.org/10.1111/1442-1984.12015},
year = {2014},
date = {2014-01-01},
journal = {Plant Species Biology},
volume = {29},
number = {3},
pages = {232-241},
abstract = {Abstract In protective ant–plant mutualisms, plants offer ants food (such as extrafloral nectar and/or food bodies) and ants protect plants from herbivores. However, ants often negatively affect plant reproduction by deterring pollinators. The aggressive protection that mutualistic ants provide to some myrmecophytes may enhance this negative effect in comparison to plant species that are facultatively protected by ants. Because little is known about the processes by which myrmecophytes are pollinated in the presence of ant guards, we examined ant interactions with herbivores and pollinators on plant reproductive organs. We examined eight myrmecophytic and three nonmyrmecophytic Macaranga species in Borneo. Most of the species studied are pollinated by thrips breeding in the inflorescences. Seven of eight myrmecophytic species produced food bodies on young inflorescences and/or immature fruits. Food body production was associated with increased ant abundance on inflorescences of the three species observed. The exclusion of ants from inflorescences of one species without food rewards resulted in increased herbivory damage. In contrast, ant exclusion had no effect on the number of pollinator thrips. The absence of thrips pollinator deterrence by ants may be due to the presence of protective bracteoles that limit ants, but not pollinators, from accessing flowers. This unique mechanism may account for simultaneous thrips pollination and ant defense of inflorescences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract In protective ant–plant mutualisms, plants offer ants food (such as extrafloral nectar and/or food bodies) and ants protect plants from herbivores. However, ants often negatively affect plant reproduction by deterring pollinators. The aggressive protection that mutualistic ants provide to some myrmecophytes may enhance this negative effect in comparison to plant species that are facultatively protected by ants. Because little is known about the processes by which myrmecophytes are pollinated in the presence of ant guards, we examined ant interactions with herbivores and pollinators on plant reproductive organs. We examined eight myrmecophytic and three nonmyrmecophytic Macaranga species in Borneo. Most of the species studied are pollinated by thrips breeding in the inflorescences. Seven of eight myrmecophytic species produced food bodies on young inflorescences and/or immature fruits. Food body production was associated with increased ant abundance on inflorescences of the three species observed. The exclusion of ants from inflorescences of one species without food rewards resulted in increased herbivory damage. In contrast, ant exclusion had no effect on the number of pollinator thrips. The absence of thrips pollinator deterrence by ants may be due to the presence of protective bracteoles that limit ants, but not pollinators, from accessing flowers. This unique mechanism may account for simultaneous thrips pollination and ant defense of inflorescences.
A., Katayama, T., Kume, H., Komatsu, M., Ohashi, K., Matsumoto, R., Ichihashi, T., Kumagai, K., Otsuki
Vertical variations in wood CO2 efflux for live emergent trees in a Bornean tropical rainforest Journal Article
In: Tree Physiology, vol. 34, no. 5, pp. 503-512, 2014, ISSN: 0829-318X.
@article{1360283692644445824,
title = {Vertical variations in wood CO2 efflux for live emergent trees in a Bornean tropical rainforest},
author = {Katayama A. and Kume T. and Komatsu H. and Ohashi M. and Matsumoto K. and Ichihashi R. and Kumagai T. and Otsuki K.},
url = {https://cir.nii.ac.jp/crid/1360283692644445824},
doi = {10.1093/treephys/tpu041},
issn = {0829-318X},
year = {2014},
date = {2014-01-01},
journal = {Tree Physiology},
volume = {34},
number = {5},
pages = {503-512},
publisher = {Oxford University Press (OUP)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2013
Hirose, Dai, Sakai, Shoko, Itioka, Takao, Osono, Takashi
Microfungi associated with a myrmecophyte Macaranga bancana Journal Article
In: Tropics, vol. 22, no. 1, pp. 19-25, 2013.
@article{DaiHirose2013,
title = {Microfungi associated with a myrmecophyte \textit{Macaranga bancana}},
author = {Dai Hirose and Shoko Sakai and Takao Itioka and Takashi Osono},
doi = {10.3759/tropics.22.19},
year = {2013},
date = {2013-01-01},
journal = {Tropics},
volume = {22},
number = {1},
pages = {19-25},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Takeuchi, Yayoi, Nakagawa, Michiko, Diway, Bibian, Nakashizuka, Tohru
Reproductive success of a tropical tree, Shorea laxa, in a pulau (forest reserve) managed by a local community in Borneo Journal Article
In: Forest Ecology and Management, vol. 289, pp. 416-424, 2013, ISSN: 0378-1127.
@article{TAKEUCHI2013416,
title = {Reproductive success of a tropical tree, Shorea laxa, in a pulau (forest reserve) managed by a local community in Borneo},
author = {Yayoi Takeuchi and Michiko Nakagawa and Bibian Diway and Tohru Nakashizuka},
url = {https://www.sciencedirect.com/science/article/pii/S037811271200624X},
doi = {https://doi.org/10.1016/j.foreco.2012.10.027},
issn = {0378-1127},
year = {2013},
date = {2013-01-01},
journal = {Forest Ecology and Management},
volume = {289},
pages = {416-424},
abstract = {For local communities of Sarawak, Malaysia, pulaus (forest reserves) are important components of agriculture and forestry systems, e.g., as seed orchards. However, pulaus are often fragmented, which may affect tree reproductive and regeneration processes and cause low seed production or seedling survival. Here, we investigated whether the pulau system affects the reproductive success of a tropical tree, Shorea laxa (Dipterocarpaceae). First, we compared survivorship during the flower-to-seedling stages, seed fate and seedling mortality between a pulau and a primary forest. Next, we evaluated the neighborhood aggregation effect, i.e., local density effect, on the reproductive process. Finally, through microsatellite analysis using seed arrays, we examined the pollination process including the selfing rate, genetic diversity and pollen dispersal distances. We found no clear differences in tree survivorship during the flower-to-seedling stages between the two sites. However, predation by vertebrates was lower in the pulau, possibly because of a lower density of seed-predating vertebrates. Neighborhood aggregation was negatively correlated with seed maturation and seed survival in the pulau, similar to the primary forest. However, the scale of neighborhood aggregation differed between the two sites, suggesting a change in the scale of plant–animal interactions. Although pollen dispersal was limited within the pulau, a low selfing rate and high genetic diversity of the seed array indicated effective pollination. In this study, we did not find a strong negative effect of the pulau or of forest fragmentation on the reproduction and regeneration of S. laxa. The pulau investigated in this study was shown to provide genetically rich seeds. We also discuss the importance of the pulau system from a conservation perspective.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
For local communities of Sarawak, Malaysia, pulaus (forest reserves) are important components of agriculture and forestry systems, e.g., as seed orchards. However, pulaus are often fragmented, which may affect tree reproductive and regeneration processes and cause low seed production or seedling survival. Here, we investigated whether the pulau system affects the reproductive success of a tropical tree, Shorea laxa (Dipterocarpaceae). First, we compared survivorship during the flower-to-seedling stages, seed fate and seedling mortality between a pulau and a primary forest. Next, we evaluated the neighborhood aggregation effect, i.e., local density effect, on the reproductive process. Finally, through microsatellite analysis using seed arrays, we examined the pollination process including the selfing rate, genetic diversity and pollen dispersal distances. We found no clear differences in tree survivorship during the flower-to-seedling stages between the two sites. However, predation by vertebrates was lower in the pulau, possibly because of a lower density of seed-predating vertebrates. Neighborhood aggregation was negatively correlated with seed maturation and seed survival in the pulau, similar to the primary forest. However, the scale of neighborhood aggregation differed between the two sites, suggesting a change in the scale of plant–animal interactions. Although pollen dispersal was limited within the pulau, a low selfing rate and high genetic diversity of the seed array indicated effective pollination. In this study, we did not find a strong negative effect of the pulau or of forest fragmentation on the reproduction and regeneration of S. laxa. The pulau investigated in this study was shown to provide genetically rich seeds. We also discuss the importance of the pulau system from a conservation perspective.
Sakai, Shoko, Kawakita, Atsushi, Ooi, Kazuyuki, Inoue, Tamiji
In: American Journal of Botany, vol. 100, no. 3, pp. 546-555, 2013.
@article{https://doi.org/10.3732/ajb.1200359,
title = {Variation in the strength of association among pollination systems and floral traits: Evolutionary changes in the floral traits of Bornean gingers (Zingiberaceae)},
author = {Shoko Sakai and Atsushi Kawakita and Kazuyuki Ooi and Tamiji Inoue},
url = {https://bsapubs.onlinelibrary.wiley.com/doi/abs/10.3732/ajb.1200359},
doi = {https://doi.org/10.3732/ajb.1200359},
year = {2013},
date = {2013-01-01},
journal = {American Journal of Botany},
volume = {100},
number = {3},
pages = {546-555},
abstract = {• Premise of the study: Diversification of floral traits in angiosperms is often attributed to have been driven by adaptations to pollinators. Nevertheless, phylogenetic studies on the relationships among evolutionary changes in floral traits and pollination systems are still limited. We examined the relationships between floral trait changes and pollinator shifts in Bornean gingers (Zingiberaceae). These plants have strongly zygomorphic flowers pollinated by spiderhunter birds, bees of the genus Amegilla, and halictid bees. • Methods: We identified pollination systems through field observations and recorded petal color, quantity of floral rewards, and seven measures of flower morphology in 28 ginger species. Phylogenetic trees were constructed from nucleotide sequences of the matK and ITS regions. We examined the correlations between the evolution of pollination systems and floral traits using phylogenetically independent contrasts. • Key Results: Significant association was found between pink color and spiderhunter pollination, orange and Amegilla pollination, and yellow and white and halictid pollination. Sugar production was higher in spiderhunter-pollinated species and lower in halictid-pollinated. Meanwhile, there was a significant association only for a subset of the floral morphological characters measured. Floral tube length, which is often thought to evolve to match the lengths of pollinator probing apparatuses, did not show any correlation. • Conclusions: There is considerable variation in the strength of association among pollination systems and floral traits. Lack of significant correlation in some traits could partly be explained by floral functions other than pollination, such as adaptations to prevent herbivore damage to the ovules. Further studies on these factors may improve understanding of plant–pollinator interactions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
• Premise of the study: Diversification of floral traits in angiosperms is often attributed to have been driven by adaptations to pollinators. Nevertheless, phylogenetic studies on the relationships among evolutionary changes in floral traits and pollination systems are still limited. We examined the relationships between floral trait changes and pollinator shifts in Bornean gingers (Zingiberaceae). These plants have strongly zygomorphic flowers pollinated by spiderhunter birds, bees of the genus Amegilla, and halictid bees. • Methods: We identified pollination systems through field observations and recorded petal color, quantity of floral rewards, and seven measures of flower morphology in 28 ginger species. Phylogenetic trees were constructed from nucleotide sequences of the matK and ITS regions. We examined the correlations between the evolution of pollination systems and floral traits using phylogenetically independent contrasts. • Key Results: Significant association was found between pink color and spiderhunter pollination, orange and Amegilla pollination, and yellow and white and halictid pollination. Sugar production was higher in spiderhunter-pollinated species and lower in halictid-pollinated. Meanwhile, there was a significant association only for a subset of the floral morphological characters measured. Floral tube length, which is often thought to evolve to match the lengths of pollinator probing apparatuses, did not show any correlation. • Conclusions: There is considerable variation in the strength of association among pollination systems and floral traits. Lack of significant correlation in some traits could partly be explained by floral functions other than pollination, such as adaptations to prevent herbivore damage to the ovules. Further studies on these factors may improve understanding of plant–pollinator interactions.
Takematsu, Yoko, Kambara, Kohei, Yamaguchi, Takashi, Mitsumaki, Kazuaki
Spatial segregation of four coexisting processional termites (Termitidae: Nasutitermitinae) in tropical rainforest Journal Article
In: Entomological Science, vol. 16, no. 3, pp. 355-359, 2013.
@article{https://doi.org/10.1111/ens.12015,
title = {Spatial segregation of four coexisting processional termites (Termitidae: Nasutitermitinae) in tropical rainforest},
author = {Yoko Takematsu and Kohei Kambara and Takashi Yamaguchi and Kazuaki Mitsumaki},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/ens.12015},
doi = {https://doi.org/10.1111/ens.12015},
year = {2013},
date = {2013-01-01},
journal = {Entomological Science},
volume = {16},
number = {3},
pages = {355-359},
abstract = {Abstract In Lambir Hills National Park, Sarawak, Malaysia, there are four species of processional termites that coexist: Hospitalitermes hospitalis, H. lividiceps, H. rufus and Longipeditermes longipes. This paper presents the results of our investigation on the spatial distribution of nests and the foraging activities of the four species in coexistence. The results show that there are fairly marked differences in nesting sites, as well as in foraging activities, among the four species. It is noteworthy that H. rufus inhabits only the canopy area over 20 m above ground, apparently segregated from the other three species, and that their foraging activities are limited also to tree canopies over 10 m above ground. In contrast, L. longipes nests underground and forages exclusively on the forest floor. Hospitalitermes hospitalis and H. lividiceps inhabit and forage over wide areas, from the forest floor to tree canopies. The upper parts of the tree canopy (over 10 m) are also foraging territories of the secluded H. rufus, but there were no observations of simultaneous foraging of the three Hospitalitermes species in the same canopy areas.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract In Lambir Hills National Park, Sarawak, Malaysia, there are four species of processional termites that coexist: Hospitalitermes hospitalis, H. lividiceps, H. rufus and Longipeditermes longipes. This paper presents the results of our investigation on the spatial distribution of nests and the foraging activities of the four species in coexistence. The results show that there are fairly marked differences in nesting sites, as well as in foraging activities, among the four species. It is noteworthy that H. rufus inhabits only the canopy area over 20 m above ground, apparently segregated from the other three species, and that their foraging activities are limited also to tree canopies over 10 m above ground. In contrast, L. longipes nests underground and forages exclusively on the forest floor. Hospitalitermes hospitalis and H. lividiceps inhabit and forage over wide areas, from the forest floor to tree canopies. The upper parts of the tree canopy (over 10 m) are also foraging territories of the secluded H. rufus, but there were no observations of simultaneous foraging of the three Hospitalitermes species in the same canopy areas.
KISHIMOTO-YAMADA, KEIKO, ITIOKA, TAKAO
Seasonality in phytophagous scarabaeid (Melolonthinae and Rutelinae) abundances in an ‘aseasonal’ Bornean rainforest Journal Article
In: Insect Conservation and Diversity, vol. 6, no. 2, pp. 179-188, 2013.
@article{https://doi.org/10.1111/j.1752-4598.2012.00201.x,
title = {Seasonality in phytophagous scarabaeid (Melolonthinae and Rutelinae) abundances in an ‘aseasonal’ Bornean rainforest},
author = {KEIKO KISHIMOTO-YAMADA and TAKAO ITIOKA},
url = {https://resjournals.onlinelibrary.wiley.com/doi/abs/10.1111/j.1752-4598.2012.00201.x},
doi = {https://doi.org/10.1111/j.1752-4598.2012.00201.x},
year = {2013},
date = {2013-01-01},
journal = {Insect Conservation and Diversity},
volume = {6},
number = {2},
pages = {179-188},
abstract = {Abstract. 1. Seasonal patterns in insect population fluctuations have rarely been examined in rainforests of the central part of Southeast Asia where the climate is aseasonal. 2. We examined the seasonality of population fluctuations in a Bornean rainforest phytophagous scarabaeid assemblage (six species of Melolonthinae and seven of Rutelinae). We also investigated effects on abundances of these insects of irregularly fluctuating environmental changes, such as short-term rainfall, and community-level leaf flushing and flowering of canopy trees. Scarabaeids were collected over 6 years by monthly light-trapping. 3. Eight scarabaeid species had clear seasonality in occurrence and abundance. Seasonal trends were synchronised across the eight species; their monthly catches peaked from March to May and were nearly zero in other months. An analysis of correlations between environmental changes and insect abundances suggested that short-term changes in rainfall affected the synchrony. 4. In contrast, fluctuations in abundances of five other scarabaeid species were unrelated to calendar seasons. In one of the five scarabaeids, which is a flower-visiting species, the patterns in population fluctuation strongly correlated with flowering changes. In the remaining four species, no correlations were observed between environmental changes and population fluctuation patterns. 5. While previous studies have demonstrated that aseasonal patterns in population fluctuations are common in various insect assemblages in Southeast Asian rainforests, we show that clear seasonality is prevalent for the phytophagous scarabaeid assemblage.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract. 1. Seasonal patterns in insect population fluctuations have rarely been examined in rainforests of the central part of Southeast Asia where the climate is aseasonal. 2. We examined the seasonality of population fluctuations in a Bornean rainforest phytophagous scarabaeid assemblage (six species of Melolonthinae and seven of Rutelinae). We also investigated effects on abundances of these insects of irregularly fluctuating environmental changes, such as short-term rainfall, and community-level leaf flushing and flowering of canopy trees. Scarabaeids were collected over 6 years by monthly light-trapping. 3. Eight scarabaeid species had clear seasonality in occurrence and abundance. Seasonal trends were synchronised across the eight species; their monthly catches peaked from March to May and were nearly zero in other months. An analysis of correlations between environmental changes and insect abundances suggested that short-term changes in rainfall affected the synchrony. 4. In contrast, fluctuations in abundances of five other scarabaeid species were unrelated to calendar seasons. In one of the five scarabaeids, which is a flower-visiting species, the patterns in population fluctuation strongly correlated with flowering changes. In the remaining four species, no correlations were observed between environmental changes and population fluctuation patterns. 5. While previous studies have demonstrated that aseasonal patterns in population fluctuations are common in various insect assemblages in Southeast Asian rainforests, we show that clear seasonality is prevalent for the phytophagous scarabaeid assemblage.
Kobayashi, Masaki J., Takeuchi, Yayoi, Kenta, Tanaka, Kume, Tomonori, Diway, Bibian, Shimizu, Kentaro K.
Mass flowering of the tropical tree horea beccariana was preceded by expression changes in flowering and drought-responsive genes Journal Article
In: Molecular Ecology, vol. 22, no. 18, pp. 4767-4782, 2013.
@article{https://doi.org/10.1111/mec.12344,
title = {Mass flowering of the tropical tree horea beccariana was preceded by expression changes in flowering and drought-responsive genes},
author = {Masaki J. Kobayashi and Yayoi Takeuchi and Tanaka Kenta and Tomonori Kume and Bibian Diway and Kentaro K. Shimizu},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/mec.12344},
doi = {https://doi.org/10.1111/mec.12344},
year = {2013},
date = {2013-01-01},
journal = {Molecular Ecology},
volume = {22},
number = {18},
pages = {4767-4782},
abstract = {Abstract Community-level mass flowering, known as general flowering, which occurs in South-East Asia at supra-annual irregular intervals, is considered a particularly spectacular phenomenon in tropical ecology. Recent studies have proposed several proximate factors inducing general flowering, such as drought and falls in minimum temperature. However, limited empirical data on the developmental and physiological processes have been available to test the significance of such factors. To overcome this limitation and test the hypotheses that general flowering is triggered by the proposed factors, we conducted an ‘ecological transcriptome’ study of a mass flowering species, Shorea beccariana, comparing meteorological data with genome-wide expression patterns obtained using next-generation sequencing. Among the 98 flowering-related genes identified, the homologs of a floral pathway integrator, SbFT, and a floral repressor, SbSVP, showed dramatic transcriptional changes before flowering, and their flowering functions were confirmed using transgenic Arabidopsis thaliana. Expression in drought-responsive and sucrose-induced genes also changed before flowering. All these expression changes occurred when the flowering-inducing level of drought was reached, as estimated using data from the preceding 10 years. These genome-wide expression data support the hypothesis that drought is a trigger for general flowering.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Community-level mass flowering, known as general flowering, which occurs in South-East Asia at supra-annual irregular intervals, is considered a particularly spectacular phenomenon in tropical ecology. Recent studies have proposed several proximate factors inducing general flowering, such as drought and falls in minimum temperature. However, limited empirical data on the developmental and physiological processes have been available to test the significance of such factors. To overcome this limitation and test the hypotheses that general flowering is triggered by the proposed factors, we conducted an ‘ecological transcriptome’ study of a mass flowering species, Shorea beccariana, comparing meteorological data with genome-wide expression patterns obtained using next-generation sequencing. Among the 98 flowering-related genes identified, the homologs of a floral pathway integrator, SbFT, and a floral repressor, SbSVP, showed dramatic transcriptional changes before flowering, and their flowering functions were confirmed using transgenic Arabidopsis thaliana. Expression in drought-responsive and sucrose-induced genes also changed before flowering. All these expression changes occurred when the flowering-inducing level of drought was reached, as estimated using data from the preceding 10 years. These genome-wide expression data support the hypothesis that drought is a trigger for general flowering.
Yamasaki, Eri, Sakai, Shoko
Wind and insect pollination (ambophily) of Mallotus spp. (Euphorbiaceae) in tropical and temperate forests Journal Article
In: Australian Journal of Botany, vol. 61, no. 1, pp. 60-66, 2013, ISSN: 0067-1924.
@article{1050001335767342720,
title = {Wind and insect pollination (ambophily) of Mallotus spp. (Euphorbiaceae) in tropical and temperate forests},
author = {Eri Yamasaki and Shoko Sakai},
url = {https://cir.nii.ac.jp/crid/1050001335767342720},
doi = {10.1071/bt12202},
issn = {0067-1924},
year = {2013},
date = {2013-01-01},
journal = {Australian Journal of Botany},
volume = {61},
number = {1},
pages = {60-66},
publisher = {CSIRO Publishing},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Usun, Shimizu-kaya, Tadahiro, Okubo, Yoko, Inui, Takao, Itioka
Potential host range of myrmecophilous Arhopala butterflies (Lepidoptera: Lycaenidae) feeding on Macaranga myrmecophytes Journal Article
In: Journal of Natural History, vol. 47, no. 43-44, pp. 2707-2717, 2013, ISSN: 0022-2933.
@article{1360848658971896192,
title = {Potential host range of myrmecophilous \textit{Arhopala} butterflies (Lepidoptera: Lycaenidae) feeding on \textit{Macaranga} myrmecophytes},
author = {Shimizu-kaya Usun and Okubo Tadahiro and Inui Yoko and Itioka Takao},
url = {https://cir.nii.ac.jp/crid/1360848658971896192},
doi = {10.1080/00222933.2013.791943},
issn = {0022-2933},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
journal = {Journal of Natural History},
volume = {47},
number = {43-44},
pages = {2707-2717},
publisher = {Informa UK Limited},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Chihiro, Handa, Tadahiro, Okubo, Aogu, Yoneyama
Change in biomass of symbiotic ants throughout the ontogeny of a myrmecophyte, Macaranga beccariana (Euphorbiaceae) Journal Article
In: Journal of plant research, vol. 126, no. 1, pp. 73-79, 2013, ISSN: 09189440.
@article{1521980704806525568,
title = {Change in biomass of symbiotic ants throughout the ontogeny of a myrmecophyte, Macaranga beccariana (Euphorbiaceae)},
author = {Handa Chihiro and Okubo Tadahiro and Yoneyama Aogu},
url = {https://cir.nii.ac.jp/crid/1521980704806525568},
doi = {10.1007/s10265-012-0500-z},
issn = {09189440},
year = {2013},
date = {2013-01-01},
journal = {Journal of plant research},
volume = {126},
number = {1},
pages = {73-79},
publisher = {[Tokyo] : [Springer Japan]},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ayumi, Katayama, Tomonori, Kume, Hikaru, Komatsu
Carbon allocation in a Bornean tropical rainforest without dry seasons Journal Article
In: Journal of plant research, vol. 126, no. 4, pp. 505-515, 2013, ISSN: 09189440.
@article{1522825130443754496,
title = {Carbon allocation in a Bornean tropical rainforest without dry seasons},
author = {Katayama Ayumi and Kume Tomonori and Komatsu Hikaru},
url = {https://cir.nii.ac.jp/crid/1522825130443754496},
issn = {09189440},
year = {2013},
date = {2013-01-01},
journal = {Journal of plant research},
volume = {126},
number = {4},
pages = {505-515},
publisher = {[Tokyo] : [Springer Japan]},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2012
Gomyo, Mie, Wakahara, Taeko, Shiraki, Katsushige, Kuraji, Koichiro, Kitayama, Kanehiro, Suzuki, Masakazu
Comparison of nutrient balance between a tropical lowland forest and a tropical montane forest in Malaysian Borneo Journal Article
In: Journal of Tropical Biology & Conservation (JTBC), vol. 9, 2012.
@article{Gomyo_Wakahara_Shiraki_Kuraji_Kitayama_Suzuki_2016,
title = {Comparison of nutrient balance between a tropical lowland forest and a tropical montane forest in Malaysian Borneo},
author = {Mie Gomyo and Taeko Wakahara and Katsushige Shiraki and Koichiro Kuraji and Kanehiro Kitayama and Masakazu Suzuki},
url = {https://jurcon.ums.edu.my/ojums/index.php/jtbc/article/view/229},
doi = {10.51200/jtbc.v9i.229},
year = {2012},
date = {2012-05-01},
urldate = {2016-05-01},
journal = {Journal of Tropical Biology & Conservation (JTBC)},
volume = {9},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Katabuchi, Masatoshi, Kurokawa, Hiroko, Davies, Stuart J., Tan, Sylvester, Nakashizuka, Tohru
Soil resource availability shapes community trait structure in a species-rich dipterocarp forest Journal Article
In: Journal of Ecology, vol. 100, no. 3, pp. 643-651, 2012.
@article{https://doi.org/10.1111/j.1365-2745.2011.01937.x,
title = {Soil resource availability shapes community trait structure in a species-rich dipterocarp forest},
author = {Masatoshi Katabuchi and Hiroko Kurokawa and Stuart J. Davies and Sylvester Tan and Tohru Nakashizuka},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2745.2011.01937.x},
doi = {https://doi.org/10.1111/j.1365-2745.2011.01937.x},
year = {2012},
date = {2012-01-01},
journal = {Journal of Ecology},
volume = {100},
number = {3},
pages = {643-651},
abstract = {Summary 1. Habitat filtering and limiting similarity have been proposed as two opposing forces structuring community memberships. Community assembly theory proposes habitat filtering as a mechanism restricting community membership according to the ecological strategies of species in a given environment. Limiting similarity posits that some species exclude others that are ecologically similar. 2. We quantified nine ecophysiological and life-history traits for 80 dipterocarp species in the 52-ha Lambir Forest Dynamics Plot (FDP; Lambir Hills National Park, Sarawak, Malaysia). We studied forests on four soil types differing in fertility and moisture, focusing on soil resource availabilities as environmental determinants of habitat filtering processes. We used a null-model approach to detect the strengths of habitat filtering and limiting similarity. We quantified the relative contributions of soil resources (nutrients and water) to habitat filtering by comparing the strength of habitat filtering processes (i.e. effect sizes) at the overall plot scale and at the individual soil-type scale. We also compared the strengths of assembly processes among soil types. 3. Compared to a null model at microscale (20 × 20 m), trait range and variance were reduced for seven of nine functional traits, suggesting the importance of habitat filtering in the dipterocarp community. We also found a broader distribution of five traits, and more even spacing for seven traits (20 × 20 m), which is consistent with the concept of limiting similarity. Randomizations that swapped species occurrences within soil types (i.e. null models removing soil effects in assembly processes) were much closer to observed values, and there were no phylogenetic constraints on habitat association. Hence, soil resource availability acted as a habitat filtering mechanism in the FDP; relative contributions to habitat filtering ranged from 35% for seed mass to 77% for relative growth rate. Furthermore, soil types apparently affected the strengths of habitat filtering and limiting similarity. 4. Synthesis. We demonstrate that soil resource availability is a crucial determinant of habitat filtering in this species-rich tropical rain forest; the strengths of assembly processes differed among soil types. Variation in soil resource availability can shape the distribution of traits through community assembly processes, promoting trait diversification and species coexistence.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Summary 1. Habitat filtering and limiting similarity have been proposed as two opposing forces structuring community memberships. Community assembly theory proposes habitat filtering as a mechanism restricting community membership according to the ecological strategies of species in a given environment. Limiting similarity posits that some species exclude others that are ecologically similar. 2. We quantified nine ecophysiological and life-history traits for 80 dipterocarp species in the 52-ha Lambir Forest Dynamics Plot (FDP; Lambir Hills National Park, Sarawak, Malaysia). We studied forests on four soil types differing in fertility and moisture, focusing on soil resource availabilities as environmental determinants of habitat filtering processes. We used a null-model approach to detect the strengths of habitat filtering and limiting similarity. We quantified the relative contributions of soil resources (nutrients and water) to habitat filtering by comparing the strength of habitat filtering processes (i.e. effect sizes) at the overall plot scale and at the individual soil-type scale. We also compared the strengths of assembly processes among soil types. 3. Compared to a null model at microscale (20 × 20 m), trait range and variance were reduced for seven of nine functional traits, suggesting the importance of habitat filtering in the dipterocarp community. We also found a broader distribution of five traits, and more even spacing for seven traits (20 × 20 m), which is consistent with the concept of limiting similarity. Randomizations that swapped species occurrences within soil types (i.e. null models removing soil effects in assembly processes) were much closer to observed values, and there were no phylogenetic constraints on habitat association. Hence, soil resource availability acted as a habitat filtering mechanism in the FDP; relative contributions to habitat filtering ranged from 35% for seed mass to 77% for relative growth rate. Furthermore, soil types apparently affected the strengths of habitat filtering and limiting similarity. 4. Synthesis. We demonstrate that soil resource availability is a crucial determinant of habitat filtering in this species-rich tropical rain forest; the strengths of assembly processes differed among soil types. Variation in soil resource availability can shape the distribution of traits through community assembly processes, promoting trait diversification and species coexistence.
Harata, Tsuyoshi, Nanami, Satoshi, Yamakura, Takuo, Matsuyama, Shuhei, Chong, Lucy, Diway, Bibian M., Tan, Sylvester, Itoh, Akira
Fine-scale Spatial Genetic Structure of Ten Dipterocarp Tree Species in a Bornean Rain Forest Journal Article
In: Biotropica, vol. 44, no. 5, pp. 586-594, 2012.
@article{https://doi.org/10.1111/j.1744-7429.2011.00836.x,
title = {Fine-scale Spatial Genetic Structure of Ten Dipterocarp Tree Species in a Bornean Rain Forest},
author = {Tsuyoshi Harata and Satoshi Nanami and Takuo Yamakura and Shuhei Matsuyama and Lucy Chong and Bibian M. Diway and Sylvester Tan and Akira Itoh},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1744-7429.2011.00836.x},
doi = {https://doi.org/10.1111/j.1744-7429.2011.00836.x},
year = {2012},
date = {2012-01-01},
journal = {Biotropica},
volume = {44},
number = {5},
pages = {586-594},
abstract = {Abstract Fine-scale spatial genetic structure is increasingly recognized as an important factor in the studies of tropical forest trees as it influences genetic diversity of local populations. The biologic mechanisms that generate fine-scale spatial genetic structure are not fully understood. We studied fine-scale spatial genetic structure in ten coexisting dipterocarp tree species in a Bornean rain forest using microsatellite markers. Six of the ten species showed statistically significant fine-scale spatial genetic structure. Fine-scale spatial genetic structure was stronger at smaller spatial scales (≤ 100 m) than at larger spatial scales (> 100 m) for each species. Multiple regression analysis suggested that seed dispersal distance was important at the smaller spatial scale. At the larger scale (> 100 m) and over the entire sample range (0–1000 m), pollinators and spatial distribution of adult trees were more important determinants of fine-scale spatial genetic structure. Fine-scale spatial genetic structure was stronger in species pollinated by less mobile small beetles than in species pollinated by the more mobile giant honeybee (Apis dorsata). It was also stronger in species where adult tree distributions were more clumped. The hypothesized mechanisms underlying the negative correlation between clump size and fine-scale spatial genetic structure were a large overlap among seed shadows and genetic drift within clumped species.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Fine-scale spatial genetic structure is increasingly recognized as an important factor in the studies of tropical forest trees as it influences genetic diversity of local populations. The biologic mechanisms that generate fine-scale spatial genetic structure are not fully understood. We studied fine-scale spatial genetic structure in ten coexisting dipterocarp tree species in a Bornean rain forest using microsatellite markers. Six of the ten species showed statistically significant fine-scale spatial genetic structure. Fine-scale spatial genetic structure was stronger at smaller spatial scales (≤ 100 m) than at larger spatial scales (> 100 m) for each species. Multiple regression analysis suggested that seed dispersal distance was important at the smaller spatial scale. At the larger scale (> 100 m) and over the entire sample range (0–1000 m), pollinators and spatial distribution of adult trees were more important determinants of fine-scale spatial genetic structure. Fine-scale spatial genetic structure was stronger in species pollinated by less mobile small beetles than in species pollinated by the more mobile giant honeybee (Apis dorsata). It was also stronger in species where adult tree distributions were more clumped. The hypothesized mechanisms underlying the negative correlation between clump size and fine-scale spatial genetic structure were a large overlap among seed shadows and genetic drift within clumped species.
Shouhei Ueda Chihiro Handa, Hirotaka Tanaka
How Do Scale Insects Settle into the Nests of Plant-Ants on Macaranga Myrmecophytes? Dispersal by Wind and Selection by Plant-Ants Journal Article
In: Sociobiology, vol. 59, no. 2, pp. 435–446, 2012.
@article{Handa_2014,
title = {How Do Scale Insects Settle into the Nests of Plant-Ants on Macaranga Myrmecophytes? Dispersal by Wind and Selection by Plant-Ants},
author = {Chihiro Handa, Shouhei Ueda, Hirotaka Tanaka, Takao Itino, Takao Itioka},
url = {https://periodicos.uefs.br/index.php/sociobiology/article/view/607},
doi = {10.13102/sociobiology.v59i2.607},
year = {2012},
date = {2012-01-01},
urldate = {2014-09-01},
journal = {Sociobiology},
volume = {59},
number = {2},
pages = {435–446},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2011
Maruyama, Munetoshi, Matsumoto, Takashi, Itioka, Takao
Rove beetles (Coleoptera: Staphylinidae) associated with Aenictus laeviceps (Hymenoptera: Formicidae) in sarawak, Malaysia: Strict host specificity, and first myrmecoid Aleocharini Journal Article
In: Zootaxa, no. 3102, pp. 1–26, 2011, ISSN: 1175-5326.
@article{ecbebf738f78484fb845abc857a2df14,
title = {Rove beetles (Coleoptera: Staphylinidae) associated with Aenictus laeviceps (Hymenoptera: Formicidae) in sarawak, Malaysia: Strict host specificity, and first myrmecoid Aleocharini},
author = {Munetoshi Maruyama and Takashi Matsumoto and Takao Itioka},
issn = {1175-5326},
year = {2011},
date = {2011-11-18},
journal = {Zootaxa},
number = {3102},
pages = {1–26},
publisher = {Magnolia Press},
abstract = {The fauna of myrmecophilous rove beetles associated with Aenictus laeviceps (sensu Wilson 1964) at Lambir Hills National Park, Sarawak, Malaysia was investigated. Eight species belonging to six genera of the subfamily Aleocharinae including the following new taxa are recorded and/or described: Myrmecosticta exceptionalis Maruyama gen. et sp. nov., Aenictocleptis hirsutoides Maruyama sp. nov., Aenictocleptis lambirensis Maruyama sp. nov., Mimaenictus matsumotoi Maruyama sp. nov., Procantonnetia opacithorax Maruyama sp. nov., Weissflogia pubescens Maruyama sp. nov. Three morphotypes (L1, L2 and S) are recognized in A. laeviceps, and strict host specificity by the rove beetles for the morphotypes was observed. Myrmecosticta exceptionalis is the first known myrmecoid species of the tribe Aleocharini and belongs to the Tetrasticta generic group.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The fauna of myrmecophilous rove beetles associated with Aenictus laeviceps (sensu Wilson 1964) at Lambir Hills National Park, Sarawak, Malaysia was investigated. Eight species belonging to six genera of the subfamily Aleocharinae including the following new taxa are recorded and/or described: Myrmecosticta exceptionalis Maruyama gen. et sp. nov., Aenictocleptis hirsutoides Maruyama sp. nov., Aenictocleptis lambirensis Maruyama sp. nov., Mimaenictus matsumotoi Maruyama sp. nov., Procantonnetia opacithorax Maruyama sp. nov., Weissflogia pubescens Maruyama sp. nov. Three morphotypes (L1, L2 and S) are recognized in A. laeviceps, and strict host specificity by the rove beetles for the morphotypes was observed. Myrmecosticta exceptionalis is the first known myrmecoid species of the tribe Aleocharini and belongs to the Tetrasticta generic group.
Takeuchi, Yayoi, Salcher, Michaela M, Ushio, Masayuki, Inatsugi, Rie Shimizu, Kobayashi, Masaki J, Diway, Bibian, Mering, Christian Von, Pernthaler, Jakob, Shimizu, Kentaro K.
In Situ Enzyme Activity in the Dissolved and Particulate Fraction of the Fluid from Four Pitcher Plant Species of the Genus Nepenthes Journal Article
In: PLoS ONE, vol. 6, no. 9, pp. e25144, 2011.
@article{2011_Takeuchi,
title = {In Situ Enzyme Activity in the Dissolved and Particulate Fraction of the Fluid from Four Pitcher Plant Species of the Genus Nepenthes},
author = {Yayoi Takeuchi and Michaela M Salcher and Masayuki Ushio and Rie Shimizu Inatsugi and Masaki J Kobayashi and Bibian Diway and Christian Von Mering and Jakob Pernthaler and Kentaro K. Shimizu},
url = {https://doi.org/10.1371/journal.pone.0025144},
doi = {10.1371/journal.pone.0025144},
year = {2011},
date = {2011-09-01},
journal = {PLoS ONE},
volume = {6},
number = {9},
pages = {e25144},
publisher = {Public Library of Science (PLoS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ichie, Tomoaki, Nakagawa, Michiko
Dynamics of mineral nutrient storage for mast reproduction in the tropical emergent tree Dryobalanops aromatica Journal Article
In: Ecological Research, vol. 28, no. 2, pp. 151-158, 2011.
@article{https://doi.org/10.1007/s11284-011-0836-1,
title = {Dynamics of mineral nutrient storage for mast reproduction in the tropical emergent tree Dryobalanops aromatica},
author = {Tomoaki Ichie and Michiko Nakagawa},
url = {https://esj-journals.onlinelibrary.wiley.com/doi/abs/10.1007/s11284-011-0836-1},
doi = {https://doi.org/10.1007/s11284-011-0836-1},
year = {2011},
date = {2011-05-11},
urldate = {2013-01-01},
journal = {Ecological Research},
volume = {28},
number = {2},
pages = {151-158},
abstract = {Abstract Limitations in resources are considered to be important in mass-fruiting trees, based on the speculation that they need to consume a large amount of stored resources in a very short period. To test this hypothesis, we studied the total reproductive costs per individual of the tree Dryobalanops aromatica (Dipterocarpaceae), and the dynamics of stored mineral nutrients, specifically nitrogen, phosphorus, and potassium; we then estimated the contribution of each of the stored resources to reproduction in a lowland dipterocarp forest in Sarawak, Malaysia. D. aromatica is an emergent and masting tree species, and it produced a large amount of mature fruit in a masting period running 2001–2002. The dynamics patterns were markedly different for each of the stored nutrients. The phosphorus concentration clearly decreased in the branch, stem and root during reproduction, but nitrogen fluctuated by only a small amount in any organ during this period. The potassium concentration fell in all organs during flowering, but even increased during fruit development. Stored phosphorus accounted for 67.7% of the total phosphorus requirements for reproduction, but nitrogen accounted for only 19.7%. Stored potassium did not appear to contribute anything, at least to fruit production. Our results suggest that D. aromatica supplies phosphorus needed for reproduction mainly from stored resources in the tree, unlike nitrogen or potassium. The accumulation of phosphorus could be the decisive factor in the occurrence and frequency of mast reproduction in the relatively poor soil conditions prevailing in the tropical rain forests of Southeast Asia.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Limitations in resources are considered to be important in mass-fruiting trees, based on the speculation that they need to consume a large amount of stored resources in a very short period. To test this hypothesis, we studied the total reproductive costs per individual of the tree Dryobalanops aromatica (Dipterocarpaceae), and the dynamics of stored mineral nutrients, specifically nitrogen, phosphorus, and potassium; we then estimated the contribution of each of the stored resources to reproduction in a lowland dipterocarp forest in Sarawak, Malaysia. D. aromatica is an emergent and masting tree species, and it produced a large amount of mature fruit in a masting period running 2001–2002. The dynamics patterns were markedly different for each of the stored nutrients. The phosphorus concentration clearly decreased in the branch, stem and root during reproduction, but nitrogen fluctuated by only a small amount in any organ during this period. The potassium concentration fell in all organs during flowering, but even increased during fruit development. Stored phosphorus accounted for 67.7% of the total phosphorus requirements for reproduction, but nitrogen accounted for only 19.7%. Stored potassium did not appear to contribute anything, at least to fruit production. Our results suggest that D. aromatica supplies phosphorus needed for reproduction mainly from stored resources in the tree, unlike nitrogen or potassium. The accumulation of phosphorus could be the decisive factor in the occurrence and frequency of mast reproduction in the relatively poor soil conditions prevailing in the tropical rain forests of Southeast Asia.
HANDA, Chihiro, TAKAO, Itiokai
Effects of symbiotic coccid on the plant-ant colony growth in the myrmecophyte Macaranga bancana Journal Article
In: Tropics, vol. 19, no. 4, pp. 139-144, 2011.
@article{2011,
title = {Effects of symbiotic coccid on the plant-ant colony growth in the myrmecophyte \textit{\textit{Macaranga} bancana}},
author = {Chihiro HANDA and Itiokai TAKAO},
doi = {10.3759/tropics.19.139},
year = {2011},
date = {2011-01-01},
journal = {Tropics},
volume = {19},
number = {4},
pages = {139-144},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
F., Hyodo, Y., Takematsu, T., Matsumoto, Y., Inui, T., Itioka
Feeding habits of Hymenoptera and Isoptera in a tropical rain forest as revealed by nitrogen and carbon isotope ratios Journal Article
In: Insectes Sociaux, vol. 58, no. 3, pp. 417-426, 2011, ISSN: 0020-1812.
@article{1360004231145884032,
title = {Feeding habits of Hymenoptera and Isoptera in a tropical rain forest as revealed by nitrogen and carbon isotope ratios},
author = {Hyodo F. and Takematsu Y. and Matsumoto T. and Inui Y. and Itioka T.},
url = {https://cir.nii.ac.jp/crid/1360004231145884032},
doi = {10.1007/s00040-011-0159-9},
issn = {0020-1812},
year = {2011},
date = {2011-01-01},
journal = {Insectes Sociaux},
volume = {58},
number = {3},
pages = {417-426},
publisher = {Springer Science and Business Media LLC},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tanaka, Hiroshi O., Takao, Itioka
Ants inhabiting myrmecophytic ferns regulate the distribution of lianas on emergent trees in a Bornean tropical rainforest Journal Article
In: Biology Letters, vol. 7, no. 5, pp. 706-709, 2011, ISSN: 1744-9561.
@article{1360285709893456000,
title = {Ants inhabiting myrmecophytic ferns regulate the distribution of lianas on emergent trees in a Bornean tropical rainforest},
author = {Hiroshi O. Tanaka and Itioka Takao},
url = {https://cir.nii.ac.jp/crid/1360285709893456000},
doi = {10.1098/rsbl.2011.0242},
issn = {1744-9561},
year = {2011},
date = {2011-01-01},
journal = {Biology Letters},
volume = {7},
number = {5},
pages = {706-709},
publisher = {The Royal Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
T. Kado Y. Tsumura, K. Yoshida
Molecular database for classifying Shorea species (Dipterocarpaceae) and techniques for checking the legitimacy of timber and wood products Journal Article
In: Journal of plant research, vol. 124, no. 1, pp. 35-48, 2011, ISSN: 09189440.
@article{1521699228454294400,
title = {Molecular database for classifying Shorea species (Dipterocarpaceae) and techniques for checking the legitimacy of timber and wood products},
author = {Y. Tsumura, T. Kado, K. Yoshida, H. Abe, M. Ohtani, Y. Taguchi, Y. Fukue, N. Tani, S. Ueno, K. Yoshimura, K. Kamiya, K. Harada, Y. Takeuchi, B. Diway, R. Finkeldey, M. Na'iem, S. Indrioko, K. K. S. Ng, N. Muhammad, S. L. Lee},
url = {https://cir.nii.ac.jp/crid/1521699228454294400},
issn = {09189440},
year = {2011},
date = {2011-01-01},
urldate = {2011-01-01},
journal = {Journal of plant research},
volume = {124},
number = {1},
pages = {35-48},
publisher = {[Tokyo] : [Springer Japan]},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2010
Yamada, Keiko Kishimoto, Itioka, Takao, Sakai, Shoko, Ichie, Tomoaki
Seasonality in light-attracted chrysomelid populations in a Bornean rainforest Journal Article
In: Insect Conservation and Diversity, vol. 3, no. 4, pp. 266–277, 2010.
@article{2010_KishimotoYamada,
title = {Seasonality in light-attracted chrysomelid populations in a Bornean rainforest},
author = {Keiko Kishimoto Yamada and Takao Itioka and Shoko Sakai and Tomoaki Ichie},
url = {https://doi.org/10.1111/j.1752-4598.2010.00099.x},
doi = {10.1111/j.1752-4598.2010.00099.x},
year = {2010},
date = {2010-05-01},
journal = {Insect Conservation and Diversity},
volume = {3},
number = {4},
pages = {266–277},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kenzo, Tanaka, Ichie, Tomoaki, Hattori, Daisuke, Kendawang, Joseph Jawa, Sakurai, Katsutoshi, Ninomiya, Ikuo
Changes in above- and belowground biomass in early successional tropical secondary forests after shifting cultivation in Sarawak, Malaysia Journal Article
In: Forest Ecology and Management, vol. 260, no. 5, pp. 875-882, 2010, ISSN: 0378-1127.
@article{KENZO2010875,
title = {Changes in above- and belowground biomass in early successional tropical secondary forests after shifting cultivation in Sarawak, Malaysia},
author = {Tanaka Kenzo and Tomoaki Ichie and Daisuke Hattori and Joseph Jawa Kendawang and Katsutoshi Sakurai and Ikuo Ninomiya},
url = {https://www.sciencedirect.com/science/article/pii/S0378112710003294},
doi = {https://doi.org/10.1016/j.foreco.2010.06.006},
issn = {0378-1127},
year = {2010},
date = {2010-01-01},
journal = {Forest Ecology and Management},
volume = {260},
number = {5},
pages = {875-882},
abstract = {Uncertainties in the rate of biomass variation with forest ageing in tropical secondary forests, particularly in belowground components, limit the accuracy of carbon pool estimates in tropical regions. We monitored changes in above- and belowground biomass, leaf area index (LAI), and biomass allocation to the leaf component to determine the variation in carbon accumulation rate with forest age after shifting cultivation in Sarawak, Malaysia. Nine plots in a 4-year-old forest and fourteen plots in a 10-year-old forest were monitored for 5 and 7 years, respectively. Forest and plant part biomass were calculated from an allometric equation obtained from the same forest stands. Both above- and belowground biomass increased rapidly during the initial decade after abandonment. In contrast, a much slower rate of biomass accumulation was observed after the initial decade. LAI also increased by approximately double from the 4-year-old to 10-year-old forest, and then gently increased to the 17-year-old forest. We also found that allocation variation in leaf biomass and nitrogen was closely related to the rate of biomass accumulation as a forest aged. During the first decade after abandonment, a high biomass and nitrogen allocation to the leaf component may have allowed for a high rate of biomass accumulation. However, reduction in those allocations to leaf component after the initial decade may have helped to suppress the biomass accumulation rate in older secondary forests. Roots accounted for 14.0–16.1% of total biomass in the 4–17-year-old abandoned secondary forests. We also verified the model predicted values for belowground biomass by Cairns et al. (1997) and Mokany et al. (2006), although both models overestimated the values throughout our data sets by 45–50% in the 10-year-old forest. The low root:shoot ratio in the secondary forests may have caused this overestimation. Therefore, our results suggest that we should modify the models to estimate belowground biomass considering the low root:shoot ratio in tropical secondary forests.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Uncertainties in the rate of biomass variation with forest ageing in tropical secondary forests, particularly in belowground components, limit the accuracy of carbon pool estimates in tropical regions. We monitored changes in above- and belowground biomass, leaf area index (LAI), and biomass allocation to the leaf component to determine the variation in carbon accumulation rate with forest age after shifting cultivation in Sarawak, Malaysia. Nine plots in a 4-year-old forest and fourteen plots in a 10-year-old forest were monitored for 5 and 7 years, respectively. Forest and plant part biomass were calculated from an allometric equation obtained from the same forest stands. Both above- and belowground biomass increased rapidly during the initial decade after abandonment. In contrast, a much slower rate of biomass accumulation was observed after the initial decade. LAI also increased by approximately double from the 4-year-old to 10-year-old forest, and then gently increased to the 17-year-old forest. We also found that allocation variation in leaf biomass and nitrogen was closely related to the rate of biomass accumulation as a forest aged. During the first decade after abandonment, a high biomass and nitrogen allocation to the leaf component may have allowed for a high rate of biomass accumulation. However, reduction in those allocations to leaf component after the initial decade may have helped to suppress the biomass accumulation rate in older secondary forests. Roots accounted for 14.0–16.1% of total biomass in the 4–17-year-old abandoned secondary forests. We also verified the model predicted values for belowground biomass by Cairns et al. (1997) and Mokany et al. (2006), although both models overestimated the values throughout our data sets by 45–50% in the 10-year-old forest. The low root:shoot ratio in the secondary forests may have caused this overestimation. Therefore, our results suggest that we should modify the models to estimate belowground biomass considering the low root:shoot ratio in tropical secondary forests.
Itoh, Akira, Ohkubo, Tatsuhiro, Nanami, Satoshi, Tan, Sylvester, Yamakura, Takuo
Comparison of statistical tests for habitat associations in tropical forests: A case study of sympatric dipterocarp trees in a Bornean forest Journal Article
In: Forest Ecology and Management, vol. 259, no. 3, pp. 323-332, 2010, ISSN: 0378-1127.
@article{ITOH2010323,
title = {Comparison of statistical tests for habitat associations in tropical forests: A case study of sympatric dipterocarp trees in a Bornean forest},
author = {Akira Itoh and Tatsuhiro Ohkubo and Satoshi Nanami and Sylvester Tan and Takuo Yamakura},
url = {https://www.sciencedirect.com/science/article/pii/S0378112709007646},
doi = {https://doi.org/10.1016/j.foreco.2009.10.022},
issn = {0378-1127},
year = {2010},
date = {2010-01-01},
journal = {Forest Ecology and Management},
volume = {259},
number = {3},
pages = {323-332},
abstract = {Habitat difference is an important mechanism for maintenance of tree diversity in tropical forests. The first step in studies of habitat difference is to statistically analyze whether the spatial distributions of tree populations are skewed to species-specific habitats; this is called a habitat association test. We propose a novel habitat association test on the basis of the probability of tree occurrence along a continuous habitat variable. The test uses torus shift simulations to obtain a statistical significance level. We applied this test to 55 common dipterocarp species in a 52-ha plot of a Bornean forest to assess habitat associations along an elevation gradient. The results were compared to those of three existing habitat association tests using the same torus shift simulations. The results were considerably different from one another. In particular, the results of two existing tests using discrete habitat variables varied with differences in habitat definitions, specifically, differences in elevation break points, and the number of habitat classes. Thus, definitions of habitats must be taken into account when habitat association tests with discrete habitat variables are used. Analyses of artificial populations independent of habitat showed that all of the tests used were robust with respect to spatial autocorrelation in tree distributions, although one existing test had a higher risk of Type I errors, probably due to the use of multiple tests of significance. Power analysis of artificial populations in which distributions were skewed to certain elevations showed that the novel test had comparable statistical power to the most powerful existing test. Statistical power was affected not by the total number of a given tree but by the number of clumps in a plot, suggesting that >5 clumps were required for a reliable result.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Habitat difference is an important mechanism for maintenance of tree diversity in tropical forests. The first step in studies of habitat difference is to statistically analyze whether the spatial distributions of tree populations are skewed to species-specific habitats; this is called a habitat association test. We propose a novel habitat association test on the basis of the probability of tree occurrence along a continuous habitat variable. The test uses torus shift simulations to obtain a statistical significance level. We applied this test to 55 common dipterocarp species in a 52-ha plot of a Bornean forest to assess habitat associations along an elevation gradient. The results were compared to those of three existing habitat association tests using the same torus shift simulations. The results were considerably different from one another. In particular, the results of two existing tests using discrete habitat variables varied with differences in habitat definitions, specifically, differences in elevation break points, and the number of habitat classes. Thus, definitions of habitats must be taken into account when habitat association tests with discrete habitat variables are used. Analyses of artificial populations independent of habitat showed that all of the tests used were robust with respect to spatial autocorrelation in tree distributions, although one existing test had a higher risk of Type I errors, probably due to the use of multiple tests of significance. Power analysis of artificial populations in which distributions were skewed to certain elevations showed that the novel test had comparable statistical power to the most powerful existing test. Statistical power was affected not by the total number of a given tree but by the number of clumps in a plot, suggesting that >5 clumps were required for a reliable result.
Zuidema, Pieter A., Yamada, Toshihiro, During, Heinjo J., Itoh, Akira, Yamakura, Takuo, Ohkubo, Tatsuhiro, Kanzaki, Mamoru, Tan, Sylvester, Ashton, Peter S.
Recruitment subsidies support tree subpopulations in non-preferred tropical forest habitats Journal Article
In: Journal of Ecology, vol. 98, no. 3, pp. 636-644, 2010.
@article{https://doi.org/10.1111/j.1365-2745.2010.01638.x,
title = {Recruitment subsidies support tree subpopulations in non-preferred tropical forest habitats},
author = {Pieter A. Zuidema and Toshihiro Yamada and Heinjo J. During and Akira Itoh and Takuo Yamakura and Tatsuhiro Ohkubo and Mamoru Kanzaki and Sylvester Tan and Peter S. Ashton},
url = {https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2745.2010.01638.x},
doi = {https://doi.org/10.1111/j.1365-2745.2010.01638.x},
year = {2010},
date = {2010-01-01},
journal = {Journal of Ecology},
volume = {98},
number = {3},
pages = {636-644},
abstract = {Summary 1. A large share of tree species in tropical forests exhibit preference for certain habitats, resulting in strong abundance differences across habitats. While the occurrence of such habitat preference is now documented for over a thousand species, little is known about the underlying mechanisms. How are subpopulations in non-preferred habitats able to survive? Theoretical studies have suggested that these subpopulations are maintained by source–sink dynamics –‘recruitment subsidies’ from high-density to low-density subpopulations – but empirical tests are lacking. 2. Here, we evaluate the role of recruitment subsidies in maintaining subpopulations of a rainforest tree in non-preferred habitats. Our study species Scaphium borneense (Sterculiaceae) shows strong habitat preference for drier ridges at Lambir Hills, Malaysia, where it occurs at ninefold higher densities than in the wetter valleys. On slopes, Scaphium occurs at intermediate densities. 3. We estimated source–sink exchange between subpopulations in three habitats in a 52-ha plot, using nearest-neighbour analyses. We found evidence for strong recruitment subsidies to the non-preferred habitats: 83–91% of recruits (of 1 cm diameter) in the valley had likely mother trees in another habitat. For slope recruits this was 54–78%. 4. We then used 10-year demographic data to construct multi-state matrix models that included the dynamics within, and exchange of recruits between subpopulations. We found that blocking recruitment subsidies to valley and slope subpopulations led to strong reductions in subpopulation growth rates over 100 years (λ100). By contrast, λ100 of the ridge population was hardly affected by blocking recruitment exchange. 5. Elasticity analysis confirmed the importance of recruitment subsidies for λ100 in valley and slope subpopulations: elasticity of recruitment subsidies to these subpopulations was three to five times larger than local recruitment. Again, the reverse pattern was found for the preferred habitat, where elasticity for recruitment from other habitats was very low. 6. Synthesis. Our results show that recruitment subsidies can be crucial for maintaining subpopulations of tropical tree species in non-preferred habitats. To the extent that such source–sink dynamics are common among tropical tree species, this mechanism may play a role in maintaining high tree diversity in tropical forests.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Summary 1. A large share of tree species in tropical forests exhibit preference for certain habitats, resulting in strong abundance differences across habitats. While the occurrence of such habitat preference is now documented for over a thousand species, little is known about the underlying mechanisms. How are subpopulations in non-preferred habitats able to survive? Theoretical studies have suggested that these subpopulations are maintained by source–sink dynamics –‘recruitment subsidies’ from high-density to low-density subpopulations – but empirical tests are lacking. 2. Here, we evaluate the role of recruitment subsidies in maintaining subpopulations of a rainforest tree in non-preferred habitats. Our study species Scaphium borneense (Sterculiaceae) shows strong habitat preference for drier ridges at Lambir Hills, Malaysia, where it occurs at ninefold higher densities than in the wetter valleys. On slopes, Scaphium occurs at intermediate densities. 3. We estimated source–sink exchange between subpopulations in three habitats in a 52-ha plot, using nearest-neighbour analyses. We found evidence for strong recruitment subsidies to the non-preferred habitats: 83–91% of recruits (of 1 cm diameter) in the valley had likely mother trees in another habitat. For slope recruits this was 54–78%. 4. We then used 10-year demographic data to construct multi-state matrix models that included the dynamics within, and exchange of recruits between subpopulations. We found that blocking recruitment subsidies to valley and slope subpopulations led to strong reductions in subpopulation growth rates over 100 years (λ100). By contrast, λ100 of the ridge population was hardly affected by blocking recruitment exchange. 5. Elasticity analysis confirmed the importance of recruitment subsidies for λ100 in valley and slope subpopulations: elasticity of recruitment subsidies to these subpopulations was three to five times larger than local recruitment. Again, the reverse pattern was found for the preferred habitat, where elasticity for recruitment from other habitats was very low. 6. Synthesis. Our results show that recruitment subsidies can be crucial for maintaining subpopulations of tropical tree species in non-preferred habitats. To the extent that such source–sink dynamics are common among tropical tree species, this mechanism may play a role in maintaining high tree diversity in tropical forests.
Tanaka, Hiroshi O., Yamane, Seiki, Itioka, Takao
Within-tree distribution of nest sites and foraging areas of ants on canopy trees in a tropical rainforest in Borneo Journal Article
In: Population Ecology, vol. 52, no. 1, pp. 147, 2010.
@article{https://doi.org/10.1007/s10144-009-0172-2,
title = {Within-tree distribution of nest sites and foraging areas of ants on canopy trees in a tropical rainforest in Borneo},
author = {Hiroshi O. Tanaka and Seiki Yamane and Takao Itioka},
url = {https://esj-journals.onlinelibrary.wiley.com/doi/abs/10.1007/s10144-009-0172-2},
doi = {https://doi.org/10.1007/s10144-009-0172-2},
year = {2010},
date = {2010-01-01},
journal = {Population Ecology},
volume = {52},
number = {1},
pages = {147},
abstract = {Abstract It has been argued that canopy trees in tropical rainforests harbor species-rich ant assemblages; however, how ants partition the space on trees has not been adequately elucidated. Therefore, we investigated within-tree distributions of nest sites and foraging areas of individual ant colonies on canopy trees in a tropical lowland rainforest in Southeast Asia. The species diversity and colony abundance of ants were both significantly greater in crowns than on trunks. The concentration of ant species and colonies in the tree crown seemed to be associated with greater variation in nest cavity type in the crown, compared to the trunk. For ants nesting on canopy trees, the numbers of colonies and species were both higher for ants foraging only during the daytime than for those foraging at night. Similarly, for ants foraging on canopy trees, both values were higher for ants foraging only during the daytime than for those foraging at night. For most ant colonies nesting on canopy trees, foraging areas were limited to nearby nests and within the same type of microhabitat (within-tree position). All ants foraging on canopy trees in the daytime nested on canopy trees, whereas some ants foraging on the canopy trees at night nested on the ground. These results suggest that spatial partitioning by ant assemblages on canopy trees in tropical rainforests is affected by microenvironmental heterogeneity generated by three-dimensional structures (e.g., trees, epiphytes, lianas, and aerial soils) in the crowns of canopy trees. Furthermore, ant diversity appears to be enriched by both temporal (diel) and fine-scale spatial partitioning of foraging activity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract It has been argued that canopy trees in tropical rainforests harbor species-rich ant assemblages; however, how ants partition the space on trees has not been adequately elucidated. Therefore, we investigated within-tree distributions of nest sites and foraging areas of individual ant colonies on canopy trees in a tropical lowland rainforest in Southeast Asia. The species diversity and colony abundance of ants were both significantly greater in crowns than on trunks. The concentration of ant species and colonies in the tree crown seemed to be associated with greater variation in nest cavity type in the crown, compared to the trunk. For ants nesting on canopy trees, the numbers of colonies and species were both higher for ants foraging only during the daytime than for those foraging at night. Similarly, for ants foraging on canopy trees, both values were higher for ants foraging only during the daytime than for those foraging at night. For most ant colonies nesting on canopy trees, foraging areas were limited to nearby nests and within the same type of microhabitat (within-tree position). All ants foraging on canopy trees in the daytime nested on canopy trees, whereas some ants foraging on the canopy trees at night nested on the ground. These results suggest that spatial partitioning by ant assemblages on canopy trees in tropical rainforests is affected by microenvironmental heterogeneity generated by three-dimensional structures (e.g., trees, epiphytes, lianas, and aerial soils) in the crowns of canopy trees. Furthermore, ant diversity appears to be enriched by both temporal (diel) and fine-scale spatial partitioning of foraging activity.
Murase, Kaori, Yamane, Seiki, Itino, Takao, Itioka, Takao
In: SOCIOBIOLOGY, vol. 55, no. 3, pp. 883-898, 2010, ISSN: 0361-6525.
@article{1050001338921959168,
title = {Multiple Factors Maintaining High Species-Specificity in Macaranga-Crematogaster (Hymenoptera: Formicidae) Myrmecophytism: Higher Mortality in Mismatched Ant-Seedling Pairs},
author = {Kaori Murase and Seiki Yamane and Takao Itino and Takao Itioka},
url = {https://cir.nii.ac.jp/crid/1050001338921959168},
issn = {0361-6525},
year = {2010},
date = {2010-01-01},
journal = {SOCIOBIOLOGY},
volume = {55},
number = {3},
pages = {883-898},
publisher = {California State University},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hyodo, Fujio, Matsumoto, Takashi, Takematsu, Yoko, Kamoi, Tamaki, Fukuda, Daisuke, Nakagawa, Michiko, Itioka, Takao
The Structure of a Food Web in a Tropical Rain Forest in Malaysia Based on Carbon and Nitrogen Stable Isotope Ratios Journal Article
In: Journal of Tropical Ecology, vol. 26, no. 2, pp. 205–214, 2010, ISSN: 02664674, 14697831.
@article{1b1408d0-e0d3-38b3-9d89-032c1189b04f,
title = {The Structure of a Food Web in a Tropical Rain Forest in Malaysia Based on Carbon and Nitrogen Stable Isotope Ratios},
author = {Fujio Hyodo and Takashi Matsumoto and Yoko Takematsu and Tamaki Kamoi and Daisuke Fukuda and Michiko Nakagawa and Takao Itioka},
url = {http://www.jstor.org/stable/27751674},
issn = {02664674, 14697831},
year = {2010},
date = {2010-01-01},
urldate = {2025-01-25},
journal = {Journal of Tropical Ecology},
volume = {26},
number = {2},
pages = {205–214},
publisher = {Cambridge University Press},
abstract = {Carbon and nitrogen stable isotope ratios (δ13C and δ15N) have been used to study the structure of food webs. However, few studies have examined how a terrestrial food web can be depicted by this technique. We measured δ13C and δ15N in various consumers of four trophic groups (detritivores, herbivores, omnivores and predators), including vertebrates and invertebrates (14 orders, ≥24 families), as well as canopy and understorey leaves in a tropical rain forest in Malaysia. We found that δ13C and δ15N of the consumers differed significantly among the trophic groups. The predators had significantly higher δ13C than the herbivores, and were similar in δ13C to the detritivores, suggesting that most predators examined depend largely on below-ground food webs. δ15N was higher in predators than detritivores by about 3‰. The comparison of δ13C in plant materials and herbivores suggests that most herbivores are dependent on C fixed in the canopy layers. The vertebrates had significantly higher δ15N and δ13C than the invertebrates of the same trophic group, likely reflecting differences in the physiological processes and/or feeding habits. This study indicates that stable isotope techniques can help better understanding of the terrestrial food webs in terms of both trophic level and the linkage of above- and below-ground systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Carbon and nitrogen stable isotope ratios (δ13C and δ15N) have been used to study the structure of food webs. However, few studies have examined how a terrestrial food web can be depicted by this technique. We measured δ13C and δ15N in various consumers of four trophic groups (detritivores, herbivores, omnivores and predators), including vertebrates and invertebrates (14 orders, ≥24 families), as well as canopy and understorey leaves in a tropical rain forest in Malaysia. We found that δ13C and δ15N of the consumers differed significantly among the trophic groups. The predators had significantly higher δ13C than the herbivores, and were similar in δ13C to the detritivores, suggesting that most predators examined depend largely on below-ground food webs. δ15N was higher in predators than detritivores by about 3‰. The comparison of δ13C in plant materials and herbivores suggests that most herbivores are dependent on C fixed in the canopy layers. The vertebrates had significantly higher δ15N and δ13C than the invertebrates of the same trophic group, likely reflecting differences in the physiological processes and/or feeding habits. This study indicates that stable isotope techniques can help better understanding of the terrestrial food webs in terms of both trophic level and the linkage of above- and below-ground systems.