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

作     者：Wen-Yu Song Xue-You Li Zhong-Zheng Chen Quan Li Kenneth Otieno Onditi Shui-Wang He Xue-Long Jiang Wen-Yu Song;Xue-You Li;Zhong-Zheng Chen;Quan Li;Kenneth Otieno Onditi;Shui-Wang He;Xue-Long Jiang

作者机构：State Key Laboratory of Genetic Resources and EvolutionKunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223 China Kunming College of Life ScienceUniversity 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 EducationSchool of Ecology and EnvironmentAnhui Normal UniversityWuhuAnhui 241000 China 

出 版 物：《Zoological Research》 (动物学研究（英文）)

年 卷 期：2020年第41卷第6期

页      面：670-683页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0905[农学-畜牧学] 0906[农学-兽医学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program(STEP,2019QZKK0501) National Key Research and Development Program of China(2017YFC0505202) National Natural Science Foundation of China(31601874) National Natural Science Foundation of China(31702007) Biodiversity Survey,Monitoring,andAssessment Program(2019HB2096001006)。 

主　　题：Beta-diversity partitioning Community assembly Environmentalstress Habitat homogeneity Hengduan Mountains River barriers Sky islands Tree line 

摘      要：The interpretation of patterns of biodiversity requires the disentanglement of geographical and environmental variables.Disjunct alpine communities are geographically isolated from one another but experience similar environmental impacts.Isolated homogenous habitats may promote speciation but constrain functional trait variation.In this study,we examined the hypothesis that dispersal limitation promotes taxonomic divergence,whereas habitat similarity in alpine mountains leads to functional convergence.We performed standardized field investigation to sample non-volant small mammals from 18 prominent alpine sites in the Three Parallel Rivers area.We estimated indices quantifying taxonomic and functional alpha-and beta-diversity,as well as beta-diversity components.We then assessed the respective importance of geographical and environmental predictors in explaining taxonomic and functional compositions.No evidence was found to show that species were more functionally similar than expected in local assemblages.However,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 species.Geographical 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 month.Our findings provide empirical evidence that taxonomic and functional diversity patterns can be independently driven by different ecological processes.Our results point to the importance of clarifying different components of beta-diversity to understand the underlying mechanisms of community assembly.These results also shed light on the assembly rules and ecological processes of terrestrial mammal communities in extreme environments.