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Genetic diversity and population structure analysis of blunt snout bream (Megalobrama amblycephala) in the Yangtze River Basin: Implications for conservation and utilization

文献类型： 外文期刊

作者： Dong, Fang 1 ; Cheng, Peilin 2 ; Sha, Hang 2 ; Yue, Huamei 2 ; Wan, Chaoyang 2 ; Zhang, Yingyu 2 ; Zhang, Lang 2 ; Zhang, Hui 2 ; Wei, Qiwei 1 ;

作者机构： 1.Guizhou Univ, Coll Life Sci, Lab Anim Genet Breeding & Reprod Plateau Mt Reg, Minist Educ, Guiyang, Peoples R China

2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Key Lab Freshwater Biodivers Conservat, Minist Agr & Rural Affairs China, Wuhan, Peoples R China

3.Ctr Chinese Sturgeon Conservat, Wuhan, Peoples R China

关键词： Blunt snout bream; Microsatellite; Mitochondrial DNA; Genetic diversity; Genetic differentiation

期刊名称：AQUACULTURE REPORTS （ 影响因子：3.7； 五年影响因子：3.8 ）

ISSN： 2352-5134

年卷期： 2024 年 35 卷

页码：

收录情况： SCI

摘要： The blunt snout bream, Megalobrama amblycephala, is a commercially significant freshwater fish species indigenous to China. In recent decades, fishery resources of blunt snout bream in the Yangtze River have been severely depleted owing to human activities, and limited information is available regarding their genetic characteristics. This study aimed to assess the genetic diversity and population structure of different native populations of blunt snout bream in the Yangtze River. We analyzed 222 samples from six natural populations in the middle reaches of the Yangtze River and its affiliated lakes were analyzed using ten microsatellite DNA markers and concatenated sequences of two mitochondrial DNA markers (Cytb and ND2). Microsatellite analysis showed that the average observed heterozygosity (Ho), expected heterozygosity (He), and polymorphic information content (PIC) for all populations were determined as 0.687, 0.739, and 0.748 respectively. Mitochondrial sequence analysis showed that the number of haplotypes (h), haplotype diversity (Hd) and nucleotide diversity (pi) of the six populations were 29, 0.768, and 0.00641, respectively. The above findings reveal high genetic diversity within blunt snout bream populations, suggesting a robust potential for selective breeding. The phylogenetic relationship results showed that the six blunt snout bream populations clustered into two branches, indicating a measurable degree of differentiation among the populations in the middle reaches of the Yangtze River Basin and its affiliated lakes. The populations may represent distinct spawning grounds, and corresponding conservation units should be implemented to protect them. In summary, these findings provide vital genetic information for the conservation and commercialization of blunt snout bream in the Yangtze River Basin of China.

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