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首页> 外文期刊>Marine biology >Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)
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Worms without borders: genetic diversity patterns in four Brazilian Ototyphlonemertes species (Nemertea, Hoplonemertea)

机译：无国界的蠕虫：巴西四种Ototyphlonemertes物种（Nemertea，Hoplonemertea）的遗传多样性模式

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摘要

Understanding the evolutionary processes from recent demographic history is especially difficult for interstitial organisms due to their poorly known natural history. In this study, the genetic variation and population history of the four Ototyphlonemertes (Diesing in Sitz ber Math Nat Kl Akad Wiss Wien 46:413-416, 1863) species were evaluated from samples collected along the Brazilian coast (between 27°31'S and 13°00'W) in 2006. The mito-chondrial region cytochrome c oxidase subunit 3 (COX3) is analyzed to assess the genetic variation of these dioecious species. Although these species have a sympatric distribution along the coast, our data suggest that their levels of differentiation and their demographic histories differ sharply. There is strong evidence of gene flow among demes in O. erneba and O. evelinae, and their level of structuring is much lower than for the other two species. Indeed, the COX3 fragment reveals cryptic lineages in O. lactea and O. parmula. The results seem to contradict the high genetic structuring and low intrapopulational variability expected with the ecological constriction and habitat discontinuity faced by these organisms, meaning that there might be gene flow among populations or their dispersal capability has been underestimated.
机译：由于间质生物的自然史知之甚少，从近代人口史了解进化过程尤其困难。在这项研究中，从沿巴西海岸（27°31到13岁之间）采集的样品中评估了四种Ototyphlonemertes（在Sitz ber Math Nat Kl Akad Wiss Wien 46：413-416，1863年死亡）物种的遗传变异和种群历史。 （00'W）2006年。分析了线粒体区域的细胞色素C氧化酶亚基3（COX3），以评估这些雌雄异体物种的遗传变异。尽管这些物种在海岸上有同伴分布，但我们的数据表明它们的分化水平和人口历史差异很大。有强有力的证据表明，欧尼巴稻草（O. erneba）和欧文猪笼草（O. evelinae）的各居所之间存在基因流动，其结构水平远低于其他两个物种。确实，COX3片段揭示了O.lactea和O.parmula中的隐性谱系。这些结果似乎与这些生物面临的生态收缩和栖息地不连续性所期望的高遗传结构和低种群内变异性相矛盾，这意味着种群之间可能存在基因流动或它们的扩散能力被低估了。

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  • 来源
    《Marine biology》 |2011年第9期|p.2109-2124|共16页
  • 作者

    Sonia C. S. Andrade; Jon L. Norenburg; Vera N. Solferini;

  • 作者单位

    Department of Invertebrate Zoology,National Museum of Natural History,Washington, DC 20560-0163, USA,Departamento de Genetica, Evolucao e Bioagentes,Universidade Estadual de Campinas, Campinas,SP 13083-970, Brazil,Museum of Comparative Zoology,Department of Organismic and Evolutionary Biology,Harvard University, 26 Oxford St, Cambridge, MA 02138, USA;

    Department of Invertebrate Zoology,National Museum of Natural History,Washington, DC 20560-0163, USA;

    Departamento de Genetica, Evolucao e Bioagentes,Universidade Estadual de Campinas, Campinas,SP 13083-970, Brazil;

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