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首页> 外文期刊>Marine biology >Genetic Structure Of The High Dispersal Atlanto-mediterreanean Sea Star Astropecten Aranciacus Revealed By Mitochondrial Dna Sequences And Microsatellite Loci
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Genetic Structure Of The High Dispersal Atlanto-mediterreanean Sea Star Astropecten Aranciacus Revealed By Mitochondrial Dna Sequences And Microsatellite Loci

机译：线粒体Dna序列和微卫星基因座揭示的高分散性大西洋-地中海海星Astropecten Aranciacus的遗传结构。

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To investigate the impact of potential marine barriers on gene-flow in high dispersal marine invertebrates, we assessed the population genetic structure of the sea star Astropecten aranciacus. Samples were obtained from nine locations within the Atlantic and the Mediterranean Sea including populations east of the Siculo-Tunisian Strait. We obtained both DNA sequence data of the mitochondrial control region and genotype data at four micro-satellite loci. Both markers were highly polymorphic and showed a great level of genetic diversity. Genetic differentiation between populations (F_(ST)) was in general low, particularly for nuclear data, as is often the case in high dispersal marine invertebrates. Nevertheless, both marker sets indicated a significant genetic differentiation of the population from the island of Madeira to most other populations. Our results also demonstrate a clear pattern of isolation-by-distance supported by both mitochondrial and nuclear markers. Therefore, we conclude that larval dispersal of A. aranciacus is somewhat limited even within the basins of the Atlantic, the west Mediterranean and the east Mediterranean. Microsatellite loci further revealed genetic differentiation between the three basins; however, it is not clear whether this is truly caused by marine barriers. Genetic differentiation between basins might also be a result of isolation-by-distance allowing for any grouping to be significant as long as geographical neighbors are clustered together. Although levels of genetic differentiation were less pronounced in microsatellite data, both datasets were coherent and revealed similar patterns of genetic structure in A. aranciacus.
机译：为了调查潜在海洋屏障对高分散海洋无脊椎动物中基因流动的影响，我们评估了海星天星金龟子的种群遗传结构。样本是从大西洋和地中海的九个地点获得的，包括西库洛-突尼斯海峡以东的种群。我们获得了四个微卫星基因座的线粒体控制区的DNA序列数据和基因型数据。两种标记都是高度多态的，并显示出很高的遗传多样性。种群之间的遗传分化（F_（ST））通常很低，特别是对于核数据而言，高分散海洋无脊椎动物经常发生这种情况。然而，这两种标记都表明该种群从马德拉岛到大多数其他种群的显着遗传分化。我们的结果还证明了线粒体和核标记物支持的远距离隔离的清晰模式。因此，我们得出的结论是，即使在大西洋，西地中海和东地中海的盆地内，A。aranciacus的幼虫扩散也受到一定限制。微卫星基因座进一步揭示了三个盆地之间的遗传分化。但是，目前尚不清楚这是否真的是由海洋障碍造成的。流域之间的遗传分化也可能是按距离隔离的结果，只要地理邻居聚在一起就可以使任何分组都有意义。尽管在微卫星数据中遗传分化的水平不太明显，但是两个数据集是连贯的，并且揭示了阿拉伯金龟子的遗传结构的相似模式。

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