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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
Address:College of Life Sciences, Sichuan University, No.29, Wangjiang Road, Chengdu, Sichuan Province, 610064, China
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Your Position :Home->Past Journals Catalog->2010 Vol.29 No.3

Complex Terrain and Climatic Oscillations in Hengduan Mountains Influence Geographical Division of the Large White-bellied Rat (Niviventer excelsior)
Author of the article:CHEN Wei-cai1,3, YUE Bi-song1, LIU Shao-ying2*
Author's Workplace:(1.Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu 610064, China; 2. Sichuan Academy of Forestry, Chengdu 610081, China; 3. Guangxi Natural History Museum, Nanning 530012, China)
Key Words:Hengduan Mountains; Niviventer excelsior; genetic differentiation; mitochondrial cyt b gene
Abstract:The Hengduan Mountainshave undergone dramatic geological and climatic changes over the Pleistocene. The population structures of animals in this region have been significantly influenced by geographic changes and repeated glacial events during the Pleistocene, especially the last glaciations. The large white-bellied rat (Niviventer excelsior) is a rodent endemic to the Hengduan Mountains. In this study, twenty-three individuals collected from Sichuan, Tibet and Yunnan were used to investigate their genetic differentiation and evolutionary processes. The phylogenetic relationships were inferred by using maximum parsimony, maximum likelihood and Bayesian inference. The results assumed N. excelsior and N. andersoni were not monophyletic mutually, which were consequence of an incomplete lineage sorting or introgression. The topology indicated that N. excelsior has phylogeographical structure, which has correlation with their geographical origins. N. excelsior populations were isolated by Litang-Daocheng and clustered two major clades: Clade A and Clade B. In the Clade A, individuals from west Sichuan and Lushui, Yunnan clustered into sub-Clade A1; individuals from the Ailao Mountains, Yunnan clustered into sub-Clade A2. In the Clade B, sub-Clade B1 contained individuals from Chawalong, Tibet; sub-Clade B2 contained individuals from northwest Sichuan. Phylogenetic trees also supported subspecies N. e. tengchongensis and N. e. excelsior. These results indicated that complex topographic configuration in the Hengduan Mountains and climatic oscillations in Pleistocene promote genetic divergence of N. excelsior.
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