Mitogenomic analyses uncover significant genetic differentiation between different geographic populations of <i>Acrossocheilus fasciatus</i>

Acrossocheilus fasciatus is a stream-dwelling Barbinae fish with attractive striped appearance and high commercial values. In this study, we assembled the mitogenomes of 128 A. fasciatus individuals from eight different geographic populations and analyzed their nucleotide variations and genetic differences. A total of 904 non-redundant SNPs and four InDel sites were identified in these geographic populations compared with the reference mitogenome. The results of phylogenetic analysis and divergence time estimation revealed that QingYiJiang River (QYJ) population exhibits significant genetic differences and diverged about 1.36 Mya from other geographic populations, suggesting that QYJ population may have evolved into a distinct species.条纹光唇鱼 (Acrossocheilus fasciatus) 是一种栖息于溪流的鲃亚科 (Barbinae) 鱼类，其体表带有美观的条纹外观且具有较高的经济价值。本研究组装了来自8个不同地理种群的128尾条纹光唇鱼个体的线粒体基因组 (mitogenome)，并对其核苷酸变异与遗传差异进行了分析。相较于参考线粒体基因组，本研究在这些地理种群中共鉴定出904个非冗余单核苷酸多态性 (Single Nucleotide Polymorphism, SNP) 位点与4个插入缺失 (Insertion-Deletion, InDel) 位点。系统发育分析与分化时间估算结果显示，青衣江 (QingYiJiang River, QYJ) 种群存在显著的遗传分化，其与其他地理种群的分化时间约为136万年前，这表明青衣江种群或已演化成为一个独立的物种。