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Variation in trophic cascade strength is triggered by top-down process in an ant-wasp-fig system
Wang, Bo; Segar, Simon T.; Deng, Gui-Zhong; Luo, Tian-Xun; Lin, Hua; Peng, Yan-Qiong
2019
Source PublicationOIKOS
ISSN0030-1299
Volume128Issue:2Pages:185-195
Abstract

Changes in the strength of trophic cascades over time have been associated with dramatic shifts in community structure and function. However, the pattern, process, and potential underlying mechanism of temporal variation in trophic cascades remains relatively unexplored. A top-down trophic cascade has been documented for the effects of predacious weaver ants Oecophylla smaragdina on the success of fig tree Ficus racemosa seed production. Ants cause high mortality of non-pollinating fig wasps Sycophaga mayri that parasitize fruits, leading to greater success for the pollinating fig wasp-fig tree mutualists. Here, using a design in which pairs of branches were selected on a tree, and ants were excluded from one of each pair, we quantified the magnitude of the trophic cascade in the cool-dry, hot-dry and rainy (hot-wet) seasons in Xishuangbanna, southwest China. We also recorded the daily behavioral dynamics of ants and fig wasps in different seasons and analyzed the correlation between behavioral, activity and trophic cascade strength. We found that the strength of the trophic cascade was strong in the hot-dry season, diminished in the rainy season and disappeared in the cool-dry season in this system. The strength of species interactions between ants and non-pollinating fig wasps, is positively correlated with trophic cascade strength, indicating that trophic cascade strength is determined by a top-down process when the community is well established. Moreover, because pollinating fig wasps, Ceratosolen fusciceps, play a central role in the establishment of fig wasp communities, when C. fusciceps wasps are absent, the community quickly disassembles as is the case in the cool-dry season. In summary, the strength of the trophic cascade is triggered by top-down processes, however, the occurrence of the trophic cascade is determined by a keystone species that plays a central role in assembly of the community.

KeywordPredator-prey Interactions Multivariate Analyses Temporal Variation Community Dynamics Ecology Climate Models Vary
Subject AreaEnvironmental Sciences & Ecology
DOI10.1111/oik.05653
Indexed BySCI
Language英语
WOS IDWOS:000457469800004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11232
Collection2012年后新成立研究组
Affiliation1.[Wang, Bo
2.Deng, Gui-Zhong
3.Lin, Hua
4.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, CN-666303 Menglun, Peoples R China
5.[Segar, Simon T.] CAS, Biol Ctr, Dept Ecol, Inst Entomol, Ceske Budejovice, Czech Republic
6.[Segar, Simon T.] Czech Acad Sci, Inst Entomol, Biol Ctr, Ceske Budejovice, Czech Republic
7.Chinese Acad Sci, Kunming Inst Zool, State Key Lab Genet Resources & Evolut, Kunming, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Wang, Bo,Segar, Simon T.,Deng, Gui-Zhong,et al. Variation in trophic cascade strength is triggered by top-down process in an ant-wasp-fig system[J]. OIKOS,2019,128(2):185-195.
APA Wang, Bo,Segar, Simon T.,Deng, Gui-Zhong,Luo, Tian-Xun,Lin, Hua,&Peng, Yan-Qiong.(2019).Variation in trophic cascade strength is triggered by top-down process in an ant-wasp-fig system.OIKOS,128(2),185-195.
MLA Wang, Bo,et al."Variation in trophic cascade strength is triggered by top-down process in an ant-wasp-fig system".OIKOS 128.2(2019):185-195.
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