Population genetics and sympatric divergence of the freshwater gudgeon, Gobiobotia filifer, in the Yangtze River inferred from mitochondrial DNA

文献类型： 外文期刊

第一作者： Wang, Dengqiang

作者： Wang, Dengqiang;Gao, Lei;Tian, Huiwu;Dong, Weiwei;Duan, Xinbin;Liu, Shaoping;Chen, Daqing;Dong, Weiwei

作者机构：

关键词： Cyt b; genetic structure; Gobiobotia filifer; sympatric population

期刊名称：ECOLOGY AND EVOLUTION （ 影响因子：2.912； 五年影响因子：3.271 ）

ISSN： 2045-7758

年卷期： 2020 年 10 卷 1 期

页码：

收录情况： SCI

摘要： The ecosystem and Pleistocene glaciations play important roles in population demography. The freshwater gudgeon, Gobiobotia filifer, is an endemic benthic fish in the Yangtze River and is a good model for ecological and evolutionary studies. This study aimed to decode the population structure of G. filifer in the Yangtze River and reveal whether divergence occurred before or after population radiation. A total of 292 specimens from eight locations in the upper and middle reaches of the Yangtze River were collected from 2014 to 2016 and analyzed via mitochondrial DNA Cyt b gene sequencing. A moderately high level of genetic diversity was found without structures among the population. However, phylogenetic and network topology showed two distinct haplotype groups, and each group contained a similar proportion of individuals from all sampled sites. This suggested the existence of two genetically divergent source populations in G. filifer. We deduced that a secondary contact of distinct glacial refugia was the main factor creating sympatric populations of G. filifer, and climate improvement promoted population expansion and colonization.

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