We analyzed intraspecific diversity of Indian anchovy, Stolephorus indicus, a commercially and ecologically important species, using mitochondrial DNA markers so as to derive insights into population structuring and historical demography. Analyses were carried out on 128 and 138 individuals collected from 5 locations along the range of distribution using mitochondrial ATPase (843 bp) and COI (663 bp) sequences respectively. Significant connectivity and gene flow was detected among fishes collected from all the geographic locations as indicated by lack of structuring in Bayesian clustering analysis along with insignificant ΦST values. Oceanographic features of the Bay of Bengal, Arabian Sea and Andaman Sea may be favorable for the dispersal of anchovy larvae and subsequent gene flow. Historical demographic analyses indicated a demographic and spatial expansion taken place approximately during 125,000 years before present, the Pleistocene epoch. Indian Ocean witnessed emergence of upwelling events and consequent increase in productivity during the Pleistocene epoch causing a demographic and spatial expansion of anchovies. Management measures for this species should be devised considering it as a single stock along its entire range of distribution.

中文翻译：

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来自印度半岛水域的印度鳀鱼种内多样性的当代和历史模式

我们使用线粒体 DNA 标记分析了印度凤尾鱼 Stolephorus indicus 的种内多样性，这是一种在商业和生态上具有重要意义的物种，以便深入了解种群结构和历史人口统计学。分别使用线粒体 ATPase (843 bp) 和 COI (663 bp) 序列对从分布范围内的 5 个位置收集的 128 和 138 个人进行了分析。在从所有地理位置收集的鱼类中检测到显着的连通性和基因流，这表明贝叶斯聚类分析中缺乏结构以及 ΦST 值不显着。孟加拉湾、阿拉伯海和安达曼海的海洋学特征可能有利于凤尾鱼幼虫的扩散和随后的基因流动。历史人口统计分析表明，人口和空间扩张发生在大约 125,000 年前的更新世时期。在更新世时期，印度洋见证了上升流事件的出现和随之而来的生产力提高，导致凤尾鱼的人口和空间扩张。设计该物种的管理措施时，应将其视为整个分布范围内的单一种群。