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首页> 外文期刊>Marine biology >Isolation And Population Divergence Of A Widespread Indo-west Pacific Marine Gastropod At Easter Island
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Isolation And Population Divergence Of A Widespread Indo-west Pacific Marine Gastropod At Easter Island

机译：复活节岛西印度洋-太平洋太平洋腹足类动物的隔离和种群分化

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摘要

Oceanic islands represent excellent systems for studying the link between geographic isolation and population divergence. Easter Island is the world's most isolated island and exhibits a high level of endemicity in the near-shore marine environment. Yet few studies have examined the effect of such extreme isolation on the divergence of populations of widespread species that occur at Easter Island. Conus miliaris, a marine gastropod distributed throughout much of the Indo-West Pacific, occurs at Easter Island where the population is ecologically and morphologically distinct from other populations of the species. To determine whether these phenotypic differences are associated with genetic isolation of the Easter Island population, we investigated the phylogeography of this species by examining mitochondrial COI sequences obtained from 141 individuals from eight localities occurring predominantly in the western, central and southeastern Pacific. Results from our analyses show that C. miliaris at Easter Island differs genetically from other populations. We estimate that C. miliaris colonized Easter Island shortly after the origin of the island ≤0.7 million years ago and that since population founding, gene flow has occurred predominantly from Easter Island to the west and that little migration has occurred into Easter Island.
机译：海洋岛屿是研究地理隔离与人口差异之间联系的绝佳系统。复活节岛是世界上最孤立的岛屿，在近岸海洋环境中表现出很高的地方性。然而，很少有研究检查过这种极端隔离对复活节岛上广泛分布物种种群多样性的影响。米氏锥虫（Conus miliaris）是分布在印度洋-西太平洋大部分地区的一种海洋腹足纲动物，发生在复活节岛，那里的种群在生态和形态上与该物种的其他种群截然不同。为了确定这些表型差异是否与复活节岛种群的遗传隔离有关，我们通过检查线粒体COI序列，调查了该物种的系统地理学，这些线粒体来自八个地区的141个个体，主要分布在西部，中部和东南太平洋。我们的分析结果表明，复活节岛的纤毛衣原体在遗传上不同于其他种群。我们估计C. miliaris在岛屿起源≤70万年前后不久就殖民了复活节岛，并且自种群建立以来，基因流主要发生在复活节岛向西的方向，很少迁移到复活节岛。

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  • 来源
    《Marine biology》 |2009年第6期|p.1193-1202|共10页
  • 作者

    Thomas Franklin Duda Jr; Taehwan Lee;

  • 作者单位

    Department of Ecology and Evolutionary Biology and Museum of Zoology, University of Michigan, 1109 Geddes Avenue, Ann Arbor, MI 48109, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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