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

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

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Island species and their ecosystems play an important role in global biodiversity preservation, and many vulnerable island species are conser-vation 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.

genetic diversity and structureGloydius shedaoensishistorical demographyinbreedinginsular species

Guannan Wen、Long Jin、Yayong Wu、Xiaoping Wang、Jinzhong Fu、Yin Qi

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Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China

Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education),China West Normal University,Nanchong 637009,China

College of Life Sciences and Food Engineering,Yibin University,Yibin 644007,China

Nature Conservation of Snake Island and Laotieshan Mountain,Dalian 116041,China

Department of Integrative Biology,University of Guelph,Guelph,Ontario N1G 2W1,Canada

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Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education)China West Normal UniversityNature Conservation of Snake Island and Laotieshan Mountain,Dalian,China

XNYB18-02Y8Y3041

2022

动物学报(英文版)
中国科学院动物研究所,中国动物学会

动物学报(英文版)

CSCDSCI
影响因子：0.198
ISSN：1674-5507
年,卷(期)：2022.68(5)
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