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首页> 外文期刊>Copeia >Genetic Structure and Demographic History of Endemic Micronesian Blue Riffle Goby, Stiphodon caeruleus (Gobiidae) Inferred from Mitochondrial DNA Sequence Analysis
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Genetic Structure and Demographic History of Endemic Micronesian Blue Riffle Goby, Stiphodon caeruleus (Gobiidae) Inferred from Mitochondrial DNA Sequence Analysis

机译：线粒体DNA序列分析推导的地方性密克罗尼西亚蓝Riffle虾虎鱼，蓝藻（Stbiphodon caeruleus（Gobiidae））的遗传结构和人口史

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摘要

The Blue Riffle Goby, Stiphodon caeruleus (Gobiidae: Sicydiinae), is an amphidromous species endemic to the volcanic islands of Kosrae and Pohnpei, Federated States of Micronesia, in the eastern Caroline Islands. This study evaluated the population genetic structure and demographic history of S. caeruleus using mitochondrial NADH subunits 4 (ND4) and 4L (ND4L) DNA sequences. A total of 876 base pairs were successfully sequenced for 208 specimens from 15 localities. Twenty-three haplotypes were recovered with diversity indices of h = 0.489±0.043 and π = 0.097±0.012% that are lower than many other marine species. The median-joining network of haplotypes is star-like in formation and displayed no genetic structure. AMOVA results show that 99% of the genetic variation is found within populations, rather than between streams or islands. Mismatch distribution analysis and associated statistical tests indicate that a very recent demographic expansion has occurred for the species. Bayesian skyline plot confirms a gradual demographic expansion over the past 5000 years. This expansion is coincident with a reduction in sea level that produced coastal plains and shallow coastal waters, and human settlement of the islands. Our analyses suggest that populations of S. caeruleus among streams are historically unstructured for ND4 and ND4L haplotypes, that larvae may be presently recruited among streams of both islands, and that further nuclear DNA investigations are warranted to resolve potential genetic divergence of populations.
机译：Blue Riffle虾虎鱼（Stiphodon caeruleus（Gobiidae：Sicydiinae））是两栖类物种，特有于卡罗琳群岛东部的密克罗尼西亚联邦科斯雷和波恩佩火山岛。这项研究评估线粒体NADH亚基4（ND4）和4L（ND4L）DNA序列的盲肠链球菌的种群遗传结构和人口统计学历史。共成功对来自15个地区的208个标本进行了876个碱基对的测序。回收了23个单倍型，其多样性指数h = 0.489±0.043和π= 0.097±0.012％，低于许多其他海洋物种。单倍体的中位连接网络形成星形，没有遗传结构。 AMOVA结果表明，有99％的遗传变异发生在种群内，而不是在小溪或岛屿之间。不匹配分布分析和相关的统计测试表明，该物种最近发生了人口膨胀。贝叶斯天际线图确认了过去5000年中人口的逐步增长。这种扩张与海平面的下降相吻合，海平面的下降产生了沿海平原和浅水海域，以及岛屿的人类定居。我们的分析表明，溪流中的蓝藻种群对于ND4和ND4L单倍型历史上是非结构化的，目前可能在两个岛屿的溪流中招募幼虫，并且有必要进行进一步的核DNA调查来解决种群的潜在遗传差异。

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