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Whole-genome resequencing confirms the genetic effects of dams on an endangered fish Hemibagrus guttatus (Siluriformes: Bagridae): A case study in a tributary of the Pearl River

文献类型： 外文期刊

作者： Chen, Weitao 1 ; Xiang, Denggao 1 ; Gao, Shang 1 ; Zhu, Shuli 1 ; Wu, Zhi 1 ; Li, Yuefei 1 ; Li, Jie 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Guangzhou 510380, Peoples R China

2.Key Lab Aquat Anim Immune Technol Guangdong Prov, Guangzhou 510380, Peoples R China

3.Natl Fisheries Resources & Environm, Guangzhou Sci Observing & Expt Stn, Guangzhou 510380, Peoples R China

关键词： Dam construction; Endangered fish species; Whole-genome resequencing; Genetic diversity; Conservation implications

期刊名称：GENE （ 影响因子：3.5； 五年影响因子：3.3 ）

ISSN： 0378-1119

年卷期： 2024 年 895 卷

页码：

收录情况： SCI

摘要： Dam construction in riverine ecosystems has fragmented natural aquatic habitats and has altered environmental conditions. As a result, damming has been demonstrated to threaten aquatic biodiversity by reducing species distribution ranges and hindering gene exchange, leading to the inability to adapt to environmental changes. Knowledge of the contemporary genetic diversity and genetic structure of fish populations that are separated by dams is vital to developing effective conservation strategies, particularly for endangered fish species. We chose the Lianjiang River, a tributary of the Pearl River, as a case study to assess the effects of dams on the genetic diversity and genetic structure of an endangered fish species, Hemibagrus guttatus, using whole-genome resequencing data from 63 fish samples. The results indicated low levels of genetic diversity, high levels of inbreeding and decreasing trend of effective population size in fragmented H. guttatus populations. In addition, there were significant genetic structure and genetic differentiation among populations, suggesting that the dams might have affected H. guttatus populations. Our findings may benefit management and conservation practices for this endangered species that is currently suffering from the effects of dam construction.

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