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Isolated alpine habitats reveal disparate ecological drivers of taxonomic and functional beta-diversity of small mammal assemblages

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Zoological Research 2020年第6期41卷 670-683页

作者： Wen-Yu Song Xue-You Li Zhong-Zheng Chen Quan Li Kenneth Otieno Onditi Shui-Wang He Xue-Long Jiang State Key Laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223 China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan 650223 China Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education School of Ecology and EnvironmentAnhui Normal UniversityWuhuAnhui 241000 China

The interpretation of patterns of biodiversity requires the disentanglement of geographical and environmental *** alpine communities are geographically isolated from one another but experience similar environmental *** homogenous habitats may promote speciation but constrain functional trait *** this study,we examined the hypothesis that dispersal limitation promotes taxonomic divergence,whereas habitat similarity in alpine mountains leads to functional *** performed standardized field investigation to sample non-volant small mammals from 18 prominent alpine sites in the Three Parallel rivers *** estimated indices quantifying taxonomic and functional alpha-and beta-diversity,as well as beta-diversity *** then assessed the respective importance of geographical and environmental predictors in explaining taxonomic and functional *** evidence was found to show that species were more functionally similar than expected in local ***,the taxonomic turnover components were higher than functional ones(0.471±0.230 vs.0.243±0.215),with nestedness components showing the opposite pattern(0.063±0.054 vs.0.269±0.225).This indicated that differences in taxonomic compositions between sites occurred from replacement of functionally similar *** barriers were the key factor influencing both taxonomic total dissimilarity and turnover components,whereas functional betadiversity was primarily explained by climatic factors such as minimum temperature of the coldest *** findings provide empirical evidence that taxonomic and functional diversity patterns can be independently driven by different ecological *** results point to the importance of clarifying different components of beta-diversity to understand the underlying mechanisms of community *** results also shed light on the assembly rules and ecological processes of terrestrial mammal communities in extrem

关键词： Beta-diversity partitioning Community assembly Environmentalstress Habitat homogeneity Hengduan Mountains river barriers Sky islands Tree line

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