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首页> 外文期刊>Marine biology >Regional differentiation and post-glacial expansion of the Atlantic silverside, Menidia menidia, an annual fish with high dispersal potential
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Regional differentiation and post-glacial expansion of the Atlantic silverside, Menidia menidia, an annual fish with high dispersal potential

机译：大西洋银侧，（Menidia menidia）的区域分化和冰川后扩张

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摘要

The coastal marine environment of the Northwest Atlantic contains strong environmental gradients that create distinct marine biogeographic provinces by limiting dispersal, recruitment, and survival. This region has also been subjected to numerous Pleistocene glacial cycles, resulting in repeated extirpations and recolonizations in northern populations of marine organisms. In this study, we examined patterns of genetic structure and historical demography in the Atlantic silverside, Menidia menidia, an annual marine fish with high dispersal potential but with well-documented patterns of clinal phenotypic adaptation along the environmental gradients of the Northwest Atlantic. Contrary to previous studies indicating genetic homogeneity that should preclude regional adaptation, results demonstrate subtle but significant (F_(ST) = 0.07; P < 0.0001) genetic structure among three phylogeographic regions that partially correspond with biogeographic provinces, suggesting regional limits to gene flow. Tests for non-equilibrium population dynamics and latitudinal patterns in genetic diversity indicate northward population expansion from a single southern refugium following the last glacial maximum, suggesting that phylogeographic and phenotypic patterns have relatively recent origins. The recovery of phylogeographic structure and the partial correspondence of these regions to recognized biogeographic provinces suggest that the environmental gradients that shape biogeographic patterns in the Northwest Atlantic may also limit gene flow in M. menidia, creating phylogeographic structure and contributing to the creation of latitudinal phenotypic clines in this species.
机译：西北大西洋的沿海海洋环境包含强烈的环境梯度，通过限制扩散，募集和生存来创建独特的海洋生物地理省份。该地区还经历了许多更新世冰川循环，导致北部海洋生物种群反复灭绝和重新定殖。在这项研究中，我们研究了大西洋银边（Menidia menidia）的遗传结构和历史人口统计学模式，该物种是一种年度海洋鱼类，具有很高的扩散潜力，但沿西北大西洋的环境梯度具有沿岸表型适应的充分记录的模式。与先前的研究表明遗传同质性应该阻止区域适应性相反，结果表明在三个与生物地理省份相对应的系统地理区域中，遗传结构微妙但显着（F_（ST）= 0.07; P <0.0001）遗传结构，表明基因流的区域限制。对非平衡种群动态和遗传多样性纬度模式的测试表明，在最后一次冰河期之后，一个单一的南部避难所向北扩展了种群，这表明系统学和表型模式是相对较新的起源。植物地理结构的恢复以及这些区域与公认的生物地理省份的部分对应关系表明，塑造西北大西洋生物地理模式的环境梯度也可能限制了M. Menidia中的基因流动，从而形成了植物地理结构并有助于创建纬度表型该物种中的氏族。

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  • 来源
    《Marine biology》 |2011年第3期|p.515-530|共16页
  • 作者

    Megan E. Mach; Elizabeth J. Sbrocco; Lyndie A. Hice; Tara A. Duffy; David O. Conover; Paul H. Barber;

  • 作者单位

    Institute for Resource, Environment and Sustainability,Aquatic Ecosystem Research Laboratories,University of British Columbia, 429-2202 Main Mall,Vancouver, BC V6T 1Z4, Canada;

    Department of Biology, Boston University,5 Cummington Street, Boston, MA 02215, USAL. A. Hice ■ T. A. Duffy • D. O. Conover;

    School of Marine and Atmospheric Sciences, Stony BrookUniversity, Stony Brook, NY 11794-5000, USA;

    School of Marine and Atmospheric Sciences, Stony BrookUniversity, Stony Brook, NY 11794-5000, USA;

    School of Marine and Atmospheric Sciences, Stony BrookUniversity, Stony Brook, NY 11794-5000, USA;

    Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South,Los Angeles, CA 90045, USA;

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