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首页> 外文期刊>Marine ecology >Population genetic diversity and structure of a dominant tropical seagrass, Cymodocea rotundata, in the Western Pacific region
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Population genetic diversity and structure of a dominant tropical seagrass, Cymodocea rotundata, in the Western Pacific region

机译：西太平洋区域主要热带海草Cymodocea rotundata的种群遗传多样性和结构

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摘要

Cymodocea rotundata is an ecologically important tropical pioneer seagrass species distributed in the Indo-Pacific region. The population genetic diversity and structure of this species were analysed at 46 sites spanning the Philippines, Ryukyu Islands (northern limit) and Hainan Island, by using microsatellite simple sequence repeat (SSR) markers. Analyses revealed the persistence of C.rotundata likely relies on local population dynamics and fitness influenced by environmental gradients, with sexual reproduction prevalent in the Philippines while the Ryukyu and Hainan populations were predominantly established by clonal spread. Analysis of molecular variance showed significant genetic differentiation (P<0.001) among three geographic regions: the Philippines, Ryukyu and Hainan. Furthermore, the mean fixation index value was very high (FST=0.36), indicating poor dispersal potential or limited gene flow. Allelic richness and heterozygosity of C.rotundata was comparable in the Philippines and Ryukyu Islands populations. More private alleles were found in the Philippines and excess heterozygotes in the Ryukyu Islands. STRUCTURE analysis revealed that the Ryukyu and Hainan populations were mosaics of admixed alleles of individuals from the Philippines. An assignment test suggested that recruitment occurs from the Northeast Philippines to Ryukyu Islands. These results suggest that the Philippine populations are tropical seagrass hotspots and perhaps the origin of the populations in the Ryukyu and Hainan Islands. This scenario is most likely driven by the Kuroshio Current and island integration events during plate tectonic activities. The Philippine Archipelago is considered of high importance for conservation objectives and management plan of seagrasses. Likewise, the Ryukyu Islands are also important in terms of conserving regional diversity because locally adapted genotypes have important evolutionary potential in the face of environmental change.
机译：Cymodocea rotundata是分布在印度太平洋地区的一种重要的生态重要热带先驱海草物种。通过使用微卫星简单序列重复（SSR）标记，在菲律宾，琉球群岛（北限）和海南岛的46个地点分析了该物种的种群遗传多样性和结构。分析表明，轮虫的持久性很可能依赖于环境梯度影响的当地种群动态和适应性，菲律宾的性繁殖普遍，而琉球和海南的种群主要是通过无性繁殖建立的。分子变异分析显示菲律宾，琉球和海南三个地理区域之间存在显着的遗传分化（P <0.001）。此外，平均固定指数值非常高（FST = 0.36），表明分散能力差或基因流受限。在菲律宾和琉球群岛人群中，轮状梭菌的等位基因丰富度和杂合度相当。在菲律宾发现更多的私人等位基因，在琉球群岛发现更多的杂合子。结构分析表明，琉球和海南人群是菲律宾个体混合等位基因的镶嵌体。一项作业测试表明，从菲律宾东北部到琉球群岛进行了招募。这些结果表明菲律宾人口是热带海草热点，也许是琉球和海南群岛人口的起源。这种情况很可能是由于板块构造活动中的黑潮洋流和岛屿整合事件驱动的。菲律宾群岛被认为对海草的保护目标和管理计划非常重要。同样，琉球群岛在保护区域多样性方面也很重要，因为面对环境变化，适应当地情况的基因型具有重要的进化潜力。

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  • 来源
    《Marine ecology》 |2016年第4期|786-800|共15页
  • 作者

    Arriesgado Dan M.; Kurokochi Hiroyuki; Nakajima Yuichi; Matsuki Yu; Uy Wilfredo H.; Fortes Miguel D.; Campos Wilfredo L.; Nadaoka Kazuo; Lian Chunlan;

  • 作者单位

    Tokyo Institute of Technology Department of Mechanical and Environmental Informatics Meguro Tokyo Japan;

    The University of Tokyo Asian Natural Environmental Science Center Nishitokyo Tokyo Japan;

    Mindanao State University at Naawan Institute of Fisheries Research and Development Naawan Misamis Oriental Philippines;

    The University of Tokyo Asian Natural Environmental Science Center Nishitokyo Tokyo Japan;

    The University of Tokyo Asian Natural Environmental Science Center Nishitokyo Tokyo Japan;

    The University of Tokyo Asian Natural Environmental Science Center Nishitokyo Tokyo Japan;

    Mindanao State University at Naawan Institute of Fisheries Research and Development Naawan Misamis Oriental Philippines;

    University of the Philippines Marine Science Institute DilimanQuezon City Philippines;

    University of the Philippines in the Visayas Division of Biological Sciences Miag‐ao Iloilo Philippines;

    Tokyo Institute of Technology Department of Mechanical and Environmental Informatics Meguro Tokyo Japan;

    The University of Tokyo Asian Natural Environmental Science Center Nishitokyo Tokyo Japan;

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  • 正文语种 eng
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  • 关键词

    Clonality; Cymodocea rotundata; genetic diversity; Kuroshio Current; seagrass hotspot; simple sequence repeat markers; tropical pioneer species;

    机译：克隆度;圆纹夜蛾;遗传多样性;黑潮;海草热点;简单的序列重复标记;热带先锋物种;

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