Low diversity,little genetic structure but no inbreeding in a high-density island endemic pit-viper Gloydius shedaoensis  

作　　者：Guannan Wen Long Jin Yayong Wu Xiaoping Wang Jinzhong Fu Yin Qi 

机构地区：[1]Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041 [2]China Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education),China West Normal University,Nanchong 637009 [3]China College of Life Sciences and Food Engineering,Yibin University,Yibin 644007 [4]China Nature Conservation of Snake Island and Laotieshan Mountain,Dalian 116041 [5]China Department of Integrative Biology,University of Guelph,Guelph,Ontario N1G 2W1,Canada

出　　处：《Current Zoology》2022年第5期526-534,共9页动物学报（英文版）

基　　金：Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education),China West Normal University(XNYB18-02);Nature Conservation of Snake Island and Laotieshan Mountain,Dalian,China(Y8Y3041).

摘　　要：Island species and their ecosystems play an important role in global biodiversity preservation,and many vulnerable island species are conservation priorities.Although insular habitat likely facilitates the species diversification process,it may also aggravate the fragility of these species with high risk of inbreeding.The Shedao pit-viper Gloydius shedaoensis is an island endemic species with an extremely high population density,which has been categorized as vulnerable in the IUCN(International Union for the Conservation of Nature and Natural Resources)Red List.We collected 13,148 SNP(Single Nucleotide Polymorphism)from across its genome and examined its genetic diversity and demographic history.The Shedao pit-viper has a low genetic diversity but shows no sign of inbreeding.Furthermore,population genetic structure analysis,including the neighbor-joining tree,principal coordinate analysis,clustering,and spatial autocorrelation,revealed a general lack of spatial structure.Only the isolation by distance residues suggested a weak patchiness.Overall,the population is nearly panmictic and gene flow is evenly distributed across the island.A large number of individuals,small size of the island,and the lack of population structure likely all contribute to the lack of inbreeding in this species.We also detected signs of male-biased dispersal,which likely is another inbreeding avoidance strategy.Historical demographic analysis suggested that the historical population size and distribution of the species are much larger than their current ones.The multiple transgressive–regressive events since the Late Pleistocene are likely the main cause of the population size changes.Taken together,our results provide a basic scientific foundation for the conservation of this interesting and important species.

关 键 词：genetic diversity and structure Gloydius shedaoensis historical demography INBREEDING insular species 

分 类 号：Q95[生物学—动物学]