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Basset Y, Jorge LR, Butterill PT, Lamarre GPA, Dahl C, Ctvrtecka R, Gripenberg S, Lewis OT, Barrios H, Brown JW, Bunyavejchewin S, Butcher BA, Cognato AI, Davies SJ, Kaman O, Klimes P, Knížek M, Miller SE, Morse GE, Novotny V, Pongpattananurak N, Pramual P, Quicke DLJ, Sakchoowong W, Umari R, Vesterinen EJ, Weiblen G, Wright SJ, Segar ST. Host specificity and interaction networks of insects feeding on seeds and fruits in tropical rainforests. OIKOS 2021. [DOI: 10.1111/oik.08152] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yves Basset
- ForestGEO, Smithsonian Tropical Research Inst., Apartado Balboa Ancon Panamá
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
- Maestria de Entomologia, Univ. de Panamá Panama City Republic of Panama
| | - Leonardo R. Jorge
- Faculty of Science, Univ. of South Bohemia Ceske Budejovice Czech Republic
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Philip T. Butterill
- Faculty of Science, Univ. of South Bohemia Ceske Budejovice Czech Republic
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Greg P. A. Lamarre
- ForestGEO, Smithsonian Tropical Research Inst., Apartado Balboa Ancon Panamá
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Chris Dahl
- Faculty of Science, Univ. of South Bohemia Ceske Budejovice Czech Republic
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Richard Ctvrtecka
- Faculty of Science, Univ. of South Bohemia Ceske Budejovice Czech Republic
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Sofia Gripenberg
- School of Biological Sciences, Univ. of Reading Reading Berkshire UK
| | | | - Héctor Barrios
- Maestria de Entomologia, Univ. de Panamá Panama City Republic of Panama
| | - John W. Brown
- National Museum of Natural History, Smithsonian Inst. Washington DC USA
| | | | - Buntika A. Butcher
- Dept of Biology, Faculty of Science, Integrative Ecology Laboratory, Chulalongkorn Univ. Phayathai Road Pathumwan Bangkok Thailand
- Center of Excellence in Entomology: Bee Biology, Diversity of Insects and Mites, Chulalongkorn Univ. Pathumwan Bangkok Thailand
| | - Anthony I. Cognato
- Dept of Entomology, Michigan State Univ., Natural Science Bldg. East Lansing MI USA
| | - Stuart J. Davies
- Forest Global Earth Observatory, Smithsonian Tropical Research Inst. and National Museum of Natural History Washington USA
| | - Ondrej Kaman
- Faculty of Science, Univ. of South Bohemia Ceske Budejovice Czech Republic
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Petr Klimes
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | - Miloš Knížek
- Forestry and Game Management Research Inst. Strnady Jíloviště Czech Republic
| | - Scott E. Miller
- National Museum of Natural History, Smithsonian Inst. Washington DC USA
| | | | - Vojtech Novotny
- Faculty of Science, Univ. of South Bohemia Ceske Budejovice Czech Republic
- Biology Centre of the Czech Academy of Sciences, Inst. of Entomology Ceske Budejovice Czech Republic
| | | | - Pairot Pramual
- Dept of Biology, Faculty of Science, Mahasarakham Univ., Kantharawichai District Maha Sarakham Thailand
| | - Donald L. J. Quicke
- Dept of Biology, Faculty of Science, Integrative Ecology Laboratory, Chulalongkorn Univ. Phayathai Road Pathumwan Bangkok Thailand
| | - Watana Sakchoowong
- Dept of National Parks, Forest Entomology Group, Wildlife and Plant Conservation Praholyothin Road Chatujak Bangkok Thailand
| | - Ruma Umari
- New Guinea Binatang Center Madang Papua New Guinea
| | - Eero J. Vesterinen
- Dept of Biology and Biodiversity Unit, Univ. of Turku Turku Finland
- Dept of Ecology, Swedish Univ. of Agricultural Sciences Uppsala Sweden
| | - George Weiblen
- Bell Museum and Dept of Plant and Microbial Biology, Univ. of Minnesota, Gortner Avenue St. Paul MN USA
| | - S. Joseph Wright
- ForestGEO, Smithsonian Tropical Research Inst. Balboa Ancon Panamá
| | - Simon T. Segar
- Agriculture and Environment Dept, Harper Adams Univ. Newport Shropshire UK
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Maia KP, Marquitti FMD, Vaughan IP, Memmott J, Raimundo RLG. Interaction generalisation and demographic feedbacks drive the resilience of plant-insect networks to extinctions. J Anim Ecol 2021; 90:2109-2121. [PMID: 34048028 DOI: 10.1111/1365-2656.13547] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 05/13/2021] [Indexed: 11/26/2022]
Abstract
Understanding the processes driving ecological resilience, that is the extent to which systems retain their structure while absorbing perturbations, is a central challenge for theoretical and applied ecologists. Plant-insect assemblages are well-suited for the study of ecological resilience as they are species-rich and encompass a variety of ecological interactions that correspond to essential ecosystem functions. Mechanisms affecting community response to perturbations depend on both the natural history and structure of ecological interactions. Natural history attributes of the interspecific interactions, for example whether they are mutualistic or antagonistic, may affect the ecological resilience by controlling the demographic feedbacks driving ecological dynamics at the community level. Interaction generalisation may also affect resilience, by defining opportunities for interaction rewiring, the extent to which species are able to switch interactions in fluctuating environments. These natural history attributes may also interact with network structure to affect ecological resilience. Using adaptive network models, we investigated the resilience of plant-pollinator and plant-herbivore networks to species loss. We specifically investigated how fundamental natural history differences between these systems, namely the demographic consequences of the interaction and their level of generalisation-mediating rewiring opportunities-affect the resilience of dynamic ecological networks to extinctions. We also create a general benchmark for the effect of network structure on resilience simulating extinctions on theoretical networks with controlled structures. When network structure was static, pollination networks were less resilient than herbivory networks; this is related to their high levels of nestedness and the reciprocally positive feedbacks that define mutualisms, which made co-extinction cascades more likely and longer in plant-pollinator assemblages. When considering interaction rewiring, the high generalisation and the structure of pollination networks boosted their resilience to extinctions, which approached those of herbivory networks. Simulation results using theoretical networks suggested that the empirical structure of herbivory networks may protect them from collapse. Elucidating the ecological and evolutionary processes driving interaction rewiring is key to understanding the resilience of plant-insect assemblages. Accounting for rewiring requires ecologists to combine natural history with network models that incorporate feedbacks between species abundances, traits and interactions. This combination will elucidate how perturbations propagate at community level, reshaping biodiversity structure and ecosystem functions.
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Affiliation(s)
- Kate P Maia
- School of Biological Sciences, University of Bristol, Bristol, UK.,Biosciences Institute, University of Sao Paulo, Sao Paulo, Brazil
| | | | - Ian P Vaughan
- Cardiff School of Biosciences, Cardiff University, Cardiff, UK
| | - Jane Memmott
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - Rafael L G Raimundo
- Department of Engineering and Environment and Postgraduate Program in Ecology and Environmental Monitoring (PPGEMA), Centre for Applied Sciences and Education, Federal University of Paraíba, Campus IV, Rio Tinto, Brazil.,IRIS Research Group, Innovation for Resilience, Inclusion and Sustainability, Federal University of Paraíba, Campus IV, Rio Tinto, Brazil
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3
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Gripenberg S. Do pre-dispersal insect seed predators contribute to maintaining tropical forest plant diversity? Biotropica 2018. [DOI: 10.1111/btp.12602] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Andreazzi CS, Thompson JN, Guimarães PR. Network Structure and Selection Asymmetry Drive Coevolution in Species-Rich Antagonistic Interactions. Am Nat 2017; 190:99-115. [DOI: 10.1086/692110] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Increased seed predation in the second fruiting event during an exceptionally long period of community-level masting in Borneo. Ecol Res 2017. [DOI: 10.1007/s11284-017-1465-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Sam K, Ctvrtecka R, Miller SE, Rosati ME, Molem K, Damas K, Gewa B, Novotny V. Low host specificity and abundance of frugivorous lepidoptera in the lowland rain forests of Papua New Guinea. PLoS One 2017; 12:e0171843. [PMID: 28231249 PMCID: PMC5322921 DOI: 10.1371/journal.pone.0171843] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 01/26/2017] [Indexed: 11/18/2022] Open
Abstract
We studied a community of frugivorous Lepidoptera in the lowland rainforest of Papua New Guinea. Rearing revealed 122 species represented by 1,720 individuals from 326 woody plant species. Only fruits from 52% (171) of the plant species sampled were attacked. On average, Lepidoptera were reared from 1 in 89 fruits and a kilogram of fruit was attacked by 1.01 individuals. Host specificity of Lepidoptera was notably low: 69% (33) of species attacked plants from >1 family, 8% (4) fed on single family, 6% (3) on single genus and 17% (8) were monophagous. The average kilogram of fruits was infested by 0.81 individual from generalist species (defined here as feeding on >1 plant genus) and 0.07 individual from specialist species (feeding on a single host or congeneric hosts). Lepidoptera preferred smaller fruits with both smaller mesocarp and seeds. Large-seeded fruits with thin mesocarp tended to host specialist species whereas those with thick, fleshy mesocarp were often infested with both specialist and generalist species. The very low incidence of seed damage suggests that pre-dispersal seed predation by Lepidoptera does not play a major role in regulating plant populations via density-dependent mortality processes outlined by the Janzen-Connell hypothesis.
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Affiliation(s)
- Katerina Sam
- University of South Bohemia, Faculty of Science, Branisovska, Ceske Budejovice, Czech Republic
- Biology Centre CAS, Institute of Entomology, Branisovska, Ceske Budejovice, Czech Republic
| | - Richard Ctvrtecka
- University of South Bohemia, Faculty of Science, Branisovska, Ceske Budejovice, Czech Republic
| | - Scott E. Miller
- National Museum of Natural History, Smithsonian Institution, Washington, United States of America
| | - Margaret E. Rosati
- National Museum of Natural History, Smithsonian Institution, Washington, United States of America
| | - Kenneth Molem
- New Guinea Binatang Research Center, Madang, Papua New Guinea
| | - Kipiro Damas
- New Guinea Binatang Research Center, Madang, Papua New Guinea
- The University of Papua New Guinea, Waigani, University, National Capital District, Papua New Guinea
- Papua New Guinea Forest Research Institute, Lae, Morobe Province, Papua New Guinea
| | - Bradley Gewa
- New Guinea Binatang Research Center, Madang, Papua New Guinea
| | - Vojtech Novotny
- University of South Bohemia, Faculty of Science, Branisovska, Ceske Budejovice, Czech Republic
- Biology Centre CAS, Institute of Entomology, Branisovska, Ceske Budejovice, Czech Republic
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Ctvrtecka R, Sam K, Miller SE, Weiblen GD, Novotny V. Fruit sizes and the structure of frugivorous communities in a New Guinea lowland rainforest. AUSTRAL ECOL 2016. [DOI: 10.1111/aec.12326] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | - Katerina Sam
- Faculty of Science; University of South Bohemia in Ceske Budejovice
- Biology Centre; The Czech Academy of Sciences; Ceske Budejovice Czech Republic
| | - Scott E. Miller
- National Museum of Natural History; Smithsonian Institution; Washington, DC
| | - George D. Weiblen
- Bell Museum and Department of Plant Biology; University of Minnesota; St Paul Minnesota USA
| | - Vojtech Novotny
- Faculty of Science; University of South Bohemia in Ceske Budejovice
- Biology Centre; The Czech Academy of Sciences; Ceske Budejovice Czech Republic
- New Guinea Binatang Research Center; Madang Papua New Guinea
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de Araújo WS, Vieira MC, Lewinsohn TM, Almeida-Neto M. Contrasting effects of land use intensity and exotic host plants on the specialization of interactions in plant-herbivore networks. PLoS One 2015; 10:e0115606. [PMID: 25565141 PMCID: PMC4286214 DOI: 10.1371/journal.pone.0115606] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 11/30/2014] [Indexed: 11/19/2022] Open
Abstract
Human land use tends to decrease the diversity of native plant species and facilitate the invasion and establishment of exotic ones. Such changes in land use and plant community composition usually have negative impacts on the assemblages of native herbivorous insects. Highly specialized herbivores are expected to be especially sensitive to land use intensification and the presence of exotic plant species because they are neither capable of consuming alternative plant species of the native flora nor exotic plant species. Therefore, higher levels of land use intensity might reduce the proportion of highly specialized herbivores, which ultimately would lead to changes in the specialization of interactions in plant-herbivore networks. This study investigates the community-wide effects of land use intensity on the degree of specialization of 72 plant-herbivore networks, including effects mediated by the increase in the proportion of exotic plant species. Contrary to our expectation, the net effect of land use intensity on network specialization was positive. However, this positive effect of land use intensity was partially canceled by an opposite effect of the proportion of exotic plant species on network specialization. When we analyzed networks composed exclusively of endophagous herbivores separately from those composed exclusively of exophagous herbivores, we found that only endophages showed a consistent change in network specialization at higher land use levels. Altogether, these results indicate that land use intensity is an important ecological driver of network specialization, by way of reducing the local host range of herbivore guilds with highly specialized feeding habits. However, because the effect of land use intensity is offset by an opposite effect owing to the proportion of exotic host species, the net effect of land use in a given herbivore assemblage will likely depend on the extent of the replacement of native host species with exotic ones.
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Affiliation(s)
- Walter Santos de Araújo
- Programa de Pós-Graduação em Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
- Laboratório de Interações Ecológicas e Biodiversidade, Departamento de Ecologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
- * E-mail:
| | - Marcos Costa Vieira
- Programa de Pós-Graduação em Ecologia e Evolução, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
- Laboratório de Interações Ecológicas e Biodiversidade, Departamento de Ecologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Thomas M. Lewinsohn
- Laboratório de Interações Insetos-Plantas, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil
| | - Mário Almeida-Neto
- Laboratório de Interações Ecológicas e Biodiversidade, Departamento de Ecologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
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Frugivorous weevils are too rare to cause Janzen–Connell effects in New Guinea lowland rain forest. JOURNAL OF TROPICAL ECOLOGY 2014. [DOI: 10.1017/s0266467414000406] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract:A community of frugivorous weevils was studied by quantitative rearing of 57 weevil species represented by 10485 individuals from 326 woody plant species in lowland rain forest in Papua New Guinea. Only fruits from 35% of plant species were attacked by weevils. On average, weevils were reared from only 1 in 33 fruits and 1 kg of fruit was attacked by 2.51 individuals. Weevil host specificity was relatively high: 42% of weevil species fed on a single plant genus, 19% on a single plant family and only 16% were reared from more than one family. However, monophagous specialists represented only 23% of all reared individuals. The average 1 kg of fruits was infested by 1.84 individuals of generalist weevils (feeding on allogeneric or allofamilial host species), 0.52 individual of specialists (feeding on a single or several congeneric species), and 0.15 individual of unknown host specificity. Large-seeded fruits with thin mesocarp tended to host specialist species whereas those with thick, fleshy mesocarp were often infested with both specialists and generalists. Weevils tended to avoid small-seeded, fleshy fruits. The low incidence of seed damage (3% of seeds) suggests that weevils are unlikely to play a major role in regulating plant populations via density-dependent mortality processes outlined by the Janzen–Connell hypothesis.
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Abundance of insect seed predators and intensity of seed predation on Shorea (Dipterocarpaceae) in two consecutive masting events in Peninsular Malaysia. JOURNAL OF TROPICAL ECOLOGY 2011. [DOI: 10.1017/s0266467411000393] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The family Dipterocarpaceae includes 470 tree species from 13 genera in South and South-East Asian tropical forests (Ashton 1982). Many dipterocarp species in aseasonal lowland rain forests of western Malesia flower synchronously during masting (or general flowering) events, which usually occur at irregular intervals of 2–10 y (Ashton et al. 1988). Very few individuals flower at other times, and successful recruitment of seedlings is limited to those masting events (Ashton et al. 1988, Curran et al. 1999).
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Suesdek L, Lima FCT. Association of the borer Spermophthorus apuleiae (Coleoptera; Curculionidae; Scolytinae) with the "pau-ferro" tree Caesalpinia ferrea (Leguminosae). BIOTA NEOTROPICA 2011. [DOI: 10.1590/s1676-06032011000200001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The weevil subfamily Scolytinae includes beetles which may feed on the bark, trunk or roots of both live and dead trees and are sometimes considered forest and silvicultural pests. Less frequently, some species feed on seeds and may be cause economic losses when associated to plant cultivars. Spermophthorus apuleiae Costa-Lima is a Neotropical Scolytinae formerly recorded to be "associated" with seeds of Caesalpinia ferrea var. leiostachya Benth, a Brazilian tree popularly known in Portuguese as "pau-ferro". Hitherto, it was not clear whether these beetles actually feed on the seeds of that plant. In order to investigate the ability of S. apuleiae to feed on seeds of "pau-ferro", observations were done and colonies of these beetles were established. Both in the field and in captivity the beetles were not observed feeding on the seeds. Even when beetles were exposed to seeds as the only source of food they were incapable of boring or eating the seeds and died. Our data therefore suggest that S. apuleiae is a frugivorous species which peculiarly does not eat seeds of "pau-ferro".
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Affiliation(s)
- Lincoln Suesdek
- Instituto Butantan, Brazil; Universidade de São Paulo, Brazil
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Takeuchi Y, Samejima H, Nakagawa M, Diway B, Nakashizuka T. Neighborhood aggregation effect and its effective scale on reproductive success in Shorea laxa (Dipterocarpaceae). JOURNAL OF PLANT RESEARCH 2010; 123:249-259. [PMID: 19894085 DOI: 10.1007/s10265-009-0265-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Accepted: 09/11/2009] [Indexed: 05/28/2023]
Abstract
This study investigated whether reproductive success is affected by the intensity of neighborhood aggregation of adults in the tropical tree Shorea laxa. We focused on three processes in the early reproductive stages: seed maturation; seed survival (categorizing sound seed, predation by insects and predation by vertebrates) in pre-seed dispersal; and seedling survival in the post-seed dispersal stage. We used a model selection procedure to examine the aggregation effect on reproductive success. The intensity of neighborhood aggregation was represented by the neighborhood aggregation index, which contains the adult number within a specific radius and the distances to neighboring adults (weight of proximity). Then, we evaluated the models exhaustively with the aggregation index having different scales (radius and weight of proximity) to assess the scale on which aggregation had significant effects. In particular, the best effective neighborhood scale, which is defined as the scale of the index in the model with minimum Akaike information criterion, was examined to compare those scales among processes. We found that the probability of seed maturation, seed survival and seedling survival decreased with the aggregation index at specific scales. This suggests that aggregation influenced reproductive success negatively in both the pre- and post-seed dispersal stages. However, the selected radii differed among processes: >200 and 130 m in pre- and post-seed dispersal stages, respectively. The selected weight of proximity also seemed to have a weak effect on all processes and was not different among processes.
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Affiliation(s)
- Yayoi Takeuchi
- Laboratory of Forest Biology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
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Community structure of pre-dispersal seed predatory insects on eleven Shorea (Dipterocarpaceae) species. JOURNAL OF TROPICAL ECOLOGY 2009. [DOI: 10.1017/s0266467409990265] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract:The Dipterocarpaceae in South-East Asia are known for their strict mast fruiting. During fruiting, pre-dispersal seed predation by insects contributes to mortality of dipterocarp seeds. We documented the community structure of insect seed predators on 11 Shorea species in Peninsular Malaysia. Fruits were sampled sequentially throughout seed development, and 2144 and 1655 individuals of seed predator weevils and moths were collected in two mast-fruiting events. Four weevils: Nanophyes shoreae, nanophyid sp. 1, Alcidodes dipterocarpi and Alcidodes humeralis, and one moth Andrioplecta shoreae were abundant in seeds of the Shorea species. The proportion of N. shoreae to the total predators became larger in the latter fruiting event than the former while that of Alcidodes spp. became smaller. The predator species composition changed during seed development; nanophyid spp. emerged from immature fruits while Alcidodes spp. emerged from mature fruits. Andrioplecta shoreae emerged from both immature and mature fruits. The level of host specificity measured by Kullback–Leibler distance was low for most predator species in both events. Predator species composition of many Shorea was similar to each other due to the dominance of N. shoreae though it might gradually differ with the phylogenetic distance between hosts. In conclusion, predator species composition of Shorea varied during seed development within a host rather than among hosts. Intermittent synchronized fruiting by congeneric Shorea trees would be advantageous to avoid pre-dispersal insect seed predators, and contribute to their reproduction.
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Abstract
Many tree species produce far more fruits than eventually mature, with a large proportion of developing fruits being aborted midway through the development process. Whether this is a maternally controlled late-acting self-incompatibility mechanism, or an expression of inbreeding depression, is difficult to determine. In either case, however, selection is expected to favor early abortion of inbred or incompatible zygotes to minimize loss of resources. In many species, this does not occur, suggesting the possibility of adaptive reasons for retaining selfed or inbred seeds that are aborted at relatively late developmental stages. We propose that such seeds serve an important function in diluting the impact of pre-dispersal seed predators by acting as seed predator sinks and thereby increasing the survival probabilities of outcrossed and fully viable seeds. We suggest that selfed seeds retained and developed through the periods of seed predator attack are effectively offered and sacrificed for the benefit of outcrossed seeds.
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Affiliation(s)
- Jaboury Ghazoul
- Institute of Terrestrial Ecosystems, Department of Environmental Sciences, ETH Zürich, Universitätstrasse 16, Zurich 8092, Switzerland.
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van Achterberg C, Hosaka T, Ng YF, Ghani IBA. The braconid parasitoids (Hymenoptera: Braconidae) associated with seeds of Dipterocarpaceae in Malaysia. J NAT HIST 2009. [DOI: 10.1080/00222930802610501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kishimoto-Yamada K, Itioka T. Survival of Flower-visiting Chrysomelids during Non General-flowering Periods in Bornean Dipterocarp Forests. Biotropica 2008. [DOI: 10.1111/j.1744-7429.2008.00410.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kitamura S, Yumoto T, Noma N, Chuailua P, Maruhashi T, Wohandee P, Poonswad P. Aggregated seed dispersal by wreathed hornbills at a roost site in a moist evergreen forest of Thailand. Ecol Res 2008. [DOI: 10.1007/s11284-008-0460-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
Studies of host specificity in tropical insect herbivores are evolving from a focus on insect distribution data obtained by canopy fogging and other mass collecting methods, to a focus on obtaining data on insect rearing and experimentally verified feeding patterns. We review this transition and identify persisting methodological problems. Replicated quantitative surveys of plant-herbivore food webs, based on sampling efforts of an order of magnitude greater than is customary at present, may be cost-effectively achieved by small research teams supported by local assistants. Survey designs that separate historical and ecological determinants of host specificity by studying herbivores feeding on the same plant species exposed to different environmental or experimental conditions are rare. Further, we advocate the use of host-specificity measures based on plant phylogeny. Existing data suggest that a minority of species in herbivore communities feed on a single plant species when alternative congeneric hosts are available. Thus, host plant range limits tend to coincide with those of plant genera, rather than species or suprageneric taxa. Host specificity among tropical herbivore guilds decreases in the sequence: granivores > leaf-miners > fructivore > leaf-chewers = sap-suckers > xylophages > root-feeders, thus paralleling patterns observed in temperate forests. Differences in host specificity between temperate and tropical forests are difficult to assess since data on tropical herbivores originate from recent field studies, whereas their temperate counterparts derive from regional host species lists, assembled over many years. No major increase in host specificity from temperate to tropical communities is evident. This conclusion, together with the recent downward revisions of extremely high estimates of tropical species richness, suggest that tropical ecosystems may not be as biodiverse as previously thought.
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Affiliation(s)
- Vojtech Novotny
- Institute of Entomology, Czech Academy of Sciences and Biological Faculty, University of South Bohemia, Ceske Budejovice, Czech Republic.
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Nakagawa M, Takeuchi Y, Kenta T, Nakashizuka T. Predispersal Seed Predation by Insects vs. Vertebrates in Six Dipterocarp Species in Sarawak, Malaysia1. Biotropica 2005. [DOI: 10.1111/j.1744-7429.2005.00051.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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