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Population genetics of swamp eel in the Yangtze River: comparative analyses between mitochondrial and microsatellite data provide novel insights

文献类型： 外文期刊

作者： Zhou, Huaxing 1 ; Hu, Yuting 1 ; Jiang, He 1 ; Duan, Guoqing 1 ; Ling, Jun 1 ; Pan, Tingshuang 1 ; Chen, Xiaolei 1 ; Wang 1 ;

作者机构： 1.Anhui Acad Agr Sci, Fisheries Res Inst, Anhui Key Lab Aquaculture & Stock Enhancement, Hefei, Anhui, Peoples R China

关键词： Monopterus albus; Sex reversal; Mitochondrial and nuclear markers; Population genetics

期刊名称：PEERJ （ 影响因子：2.984； 五年影响因子：3.369 ）

ISSN： 2167-8359

年卷期： 2020 年 8 卷

页码：

收录情况： SCI

摘要： The swamp eel (Monopterus albus) is a typical sex reversal fish with high economic value. Several phylogeographic studies have been performed using various markers but comparative research between mitochondrial and nuclear markers is rare. Here, a fine-scale study was performed across six sites along the Yangtze River including three sites on the main stem and three sites from tributaries. A total of 180 swamp eel individuals were collected. Genetic structure and demographic history were explored using data from two mitochondrial genes and eight microsatellite loci. The results revealed the samples from tributary sites formed three separate Glades which contained site-specific lineages. Geographic isolation and the habitat patchiness caused by seasonal cutoff were inferred to be the reasons for this differentiation. Strong gene flow was detected among the sites along the main stem. Rapid flow of the river main stem may provide the dynamic for the migration of swamp eel. Interestingly, the comparative analyses between the two marker types was discordant. Mitochondrial results suggested samples from three tributary sites were highly differentiated. However, microsatellite analyses indicated the tributary samples were moderately differentiated. We conclude this discordance is mainly caused by the unique life history of sex reversal fish. Our study provides novel insights regarding the population genetics of sex reversal fish.

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