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首页> 外文期刊>Marine biology >Phylogeography of the sea star Marthasterias glacialis (Asteroidea,Echinodermata): deep genetic divergence between mitochondrial lineages in the north-western mediterranean
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Phylogeography of the sea star Marthasterias glacialis (Asteroidea,Echinodermata): deep genetic divergence between mitochondrial lineages in the north-western mediterranean

机译：海星Marthasterias glacialis（Asteroidea，Echinodermata）的系统志：地中海西北部线粒体谱系之间的深层遗传差异

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摘要

We explore the phylogeography of the broadcast spawner Marthasterias glacialis along south Europe and Azores. Sequences of the cytochrome c oxidase gene from 225 specimens, belonging to 10 localities, were analysed. We found 73 haplotypes grouped within two lineages (divergence 2.9%). One lineage was Atlanto-Mediterranean, whereas another one was exclusively Mediterranean. Estimation of lineages split goes back to 830,000-580,000 (±120,000) years ago. This suggests that sea-level oscillations during the Pleistocene glaciations promoted gene flow interruption, lineage divergence between basins and cryptic speciation. Secondary contact between populations allowed a recolonization of the Mediterranean by the Atlantic lineage. When animals of the Atlanto-Mediterranean lineage were considered separately, F_(st) index and AMOVA did not show significant differences between populations along either the Iberian Peninsula or basins. Isolation by distance between populations was not detected, and only populations of Plymouth and Azores showed significant differences to all the others.rnThe remoteness of Azores islands might explain the structure of this population. Haphazard arrival of larvae and local extinctions rather than contemporary restricted gene flow might be responsible for the distinctive population structure of Plymouth.
机译：我们探索了沿南欧和亚速尔群岛的广播繁殖者Marthasterias glacialis的系统地理学。分析了来自10个地方的225个标本中的细胞色素c氧化酶基因的序列。我们发现73个单倍型分为两个谱系（差异2.9％）。一种血统是地中海大西洋，而另一种血统是地中海。血统分裂的估计可以追溯到830,000-580,000（±120,000）年前。这表明，在更新世冰川期的海平面振荡促进了基因流的中断，盆地之间沿袭的分化以及隐性物种的形成。人口之间的第二次接触使大西洋沿岸重新定居了地中海。当分别考虑大西洋和地中海沿岸的动物时，伊比利亚半岛或流域的F_（st）指数和AMOVA在种群之间没有显示出显着差异。未检测到种群之间的距离隔离，只有普利茅斯和亚速尔群岛的种群与所有其他种群显示出显着差异。亚速尔群岛的偏远岛屿可能解释了该种群的结构。幼虫的偶然到达和局部灭绝，而不是当代受限制的基因流动，可能是造成普利茅斯独特的种群结构的原因。

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  • 来源
    《Marine biology》 |2010年第9期|P.2015-2028|共14页
  • 作者

    R. Perez-Portela; A. Villamor; V. Almada;

  • 作者单位

    Eco-Ethology Research Unit,Instituto Superior de Psicologia Aplicada (ISPA),Rua Jardim do Tabaco, 34, 1149-041 Lisbon, Portugal Department of Animal Biology (Invertebrates),Faculty of Biology, University of Barcelona, 645,Diagonal Avenue, 08028 Barcelona, Spain;

    rnCenter for Advanced Studies of Blanes (CEAB, CSIC),Acces a la Cala St. Francesc 14, 17300 Blanes, Girona, Spain;

    rnEco-Ethology Research Unit,Instituto Superior de Psicologia Aplicada (ISPA),Rua Jardim do Tabaco, 34, 1149-041 Lisbon, Portugal;

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