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首页> 外文期刊>Zoologica Scripta: An International Journal of Evolutionary Zoology >Multilocus phylogeography of the sea snake Hydrophis curtus reveals historical vicariance and cryptic lineage diversity
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Multilocus phylogeography of the sea snake Hydrophis curtus reveals historical vicariance and cryptic lineage diversity

机译：海蛇Hydrophis curtus的多位种系统学揭示了历史的变异和隐秘的谱系多样性

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The Indo-Australian archipelago (IAA) supports the world's highest diversity of marine fish, invertebrates and reptiles. Many of the marine fish and invertebrates show congruent phylogeographic patterns, supporting a view that the region's complex geo-climatic history has played an important role in generating its exceptional biodiversity. Here, we examine population genetic structure of the viviparous sea snake, Hydrophis curtus, to assess how past and present barriers to gene flow in the IAA have contributed to genetic and species diversity in a fully marine reptile. Mitochondrial and anonymous nuclear sequences and ten microsatellite loci were used to identify patterns of historical genetic structure and population expansion, reconstruct dated genealogies and assess levels of recent gene flow. These markers revealed strong concordant geographic structure within H. curtus with a prominent genetic break between populations broadly distributed in the Indian Ocean and the West Pacific. These populations were estimated to have diverged in the late Pliocene or early Pleistocene, and microsatellite admixture analyses suggested limited recent gene flow between them despite the current lack of barriers to dispersal, indicating possible cryptic species. Subsequent divergence in the mid–late Pleistocene was detected within the West Pacific clade among the populations in the Phuket-Thailand region, South-East Asia and Australia, and two of these populations also showed genetic signals of recent range expansions. Our results show that climatic fluctuations during the Plio-Pleistocene generated high levels of cryptic genetic diversity in H. curtus, and add to similar findings for diverse other marine groups in the IAA.
机译：印度－澳大利亚群岛（IAA）支持世界上海洋鱼类，无脊椎动物和爬行动物的最高多样性。许多海洋鱼类和无脊椎动物显示出一致的植物地理学特征，支持了该地区复杂的地球气候历史在产生其独特的生物多样性方面发挥着重要作用的观点。在这里，我们研究了胎生海蛇Hydrophis curtus的种群遗传结构，以评估IAA中过去和现在的基因流动障碍如何促进了整个海洋爬行动物的遗传和物种多样性。线粒体和匿名核序列以及十个微卫星基因座被用于识别历史遗传结构和种群扩展的模式，重建过时的家谱并评估最近的基因流水平。这些标记物揭示了H. curtus内强烈的协调一致的地理结构，以及在印度洋和西太平洋广泛分布的种群之间的显着遗传断裂。估计这些种群在上新世晚期或更新世早期分化，并且微卫星混合物分析表明，尽管目前缺乏传播障碍，但它们之间最近的基因流动有限，表明可能存在隐性物种。随后在普吉岛-泰国地区，东南亚和澳大利亚的种群中，在西太平洋进化枝中发现了晚更新世中期的分化，其中两个种群也显示了近期范围扩展的遗传信号。我们的结果表明，上新世期间的气候波动在H. curtus中产生了高水平的隐性遗传多样性，并为IAA中的其他各种海洋群体增加了相似的发现。

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