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首页> 外文期刊>Zoological Science >Phylogenetic Characterization of Three Morphs of Mussels (Bivalvia, Mytilidae) Inhabiting Isolated Marine Environments in Palau Islands
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Phylogenetic Characterization of Three Morphs of Mussels (Bivalvia, Mytilidae) Inhabiting Isolated Marine Environments in Palau Islands

机译：栖息在帕劳群岛孤立海洋环境中的贻贝（双壳纲，Mytilidae）的三种形态的系统发育特征

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摘要

Marine lakes in the Palau Islands are known to harbor unique marine fauna that have remained isolated since the formation of the lakes after the Last Glacial Maximum. We analyzed mussels from marine lakes located on different islands and conducted morphological, phylogenetic and population genetic characterization to clarify their evolutionary history. The mussels were morphologically classified into three differentiated morphs: NS, ON, and MC. Their common characteristics were consistent with the Brachidontes-Hormomya complex of the Mytilidae family. Phylogenetic analysis based on the nuclear 18S ribosomal RNA gene supported the taxonomic position of the mussels among the Mytilidae. In the mitochondrial cytochrome c oxidase subunit I (COI) gene lineage, NS- and MC-morphs were highly diverged from each other; their estimated time of divergence dates back to the mid-Pleistocene. ON-morph was more closely related to MC-morph, although the shell morphologies of ON-and MC-morphs were easily distinguishable. Population genetic analysis revealed the coexistence of highly diverged haplotypes within a population of ON-morph, indicating introgression of mtDNA among the morphs. Our data suggest that morphological differentiation of marine lake mussels can occur in a relatively short period under different environmental conditions. Thus, the marine lakes provide a unique site for the study of diversification in mussels.
机译：帕劳群岛的海洋湖泊以其独特的海洋动物群而著称，自上次冰河极盛期形成以来，这些海洋动物一直保持孤立。我们分析了位于不同岛屿上的海洋湖泊中的贻贝，并进行了形态，系统发育和种群遗传学表征，以阐明其进化史。贻贝在形态上分为三种不同的形态：NS，ON和MC。它们的共同特征与Mytilidae家族的Brachidontes-Hormomya复合体一致。基于核18S核糖体RNA基因的系统发育分析支持贻贝在贻贝科中的分类学地位。在线粒体细胞色素c氧化酶亚基I（COI）基因谱系中，NS型和MC型彼此高度背离。他们估计的发散时间可以追溯到中更新世。尽管ON-和MC-morphs的壳形态很容易区分，但ON-morph与MC-morph的关系更为密切。群体遗传学分析显示，高通量单倍型在ON型群体中共存，表明mtDNA渗入了这些形态。我们的数据表明，在不同的环境条件下，海洋贻贝的形态分化可以在相对较短的时间内发生。因此，海洋湖泊为贻贝的多样化研究提供了独特的场所。

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