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首页> 外文期刊>Marine biology >Wide-spread genetic variability and the paradox of effective population size in the gag, Mycteroperca microlepis, along the West Florida Shelf
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Wide-spread genetic variability and the paradox of effective population size in the gag, Mycteroperca microlepis, along the West Florida Shelf

机译：沿西佛罗里达大陆架的插科动物Mycteroperca microlepis的广泛遗传变异和有效种群规模的悖论

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摘要

Wide-ranging marine species are often described as having a low effective population size (N_e) to census size (N) ratio. This genetic phenomenon is typically attributed to large variation among individuals in reproductive success because of the high mortality rates and unpredictable environments associated with larval dispersal. In this study, we examined patterns of genetic variation in gag (Mycteroperca microlepis) on the West Florida Shelf across year classes of post-settlement juveniles and spawning adults. With no significant genetic differentiation among year classes despite varying recruitment dynamics, little evidence for chaotic genetic patchiness, and no truncation of adult genetic diversity in subsequent juvenile cohorts, there was little support for large variation among individual in reproductive success contributing to a low N_e/N ratio. In fact, the consistent lack of significant differences in annual recruitment classes indicated that reproductive success among individuals was resistant to skewing. Among the various evolutionary forces that may be affecting N_e, changes to demography due to fishing pressure are posited as a likely mechanism affecting current levels of genetic variation.
机译：通常将范围广泛的海洋物种描述为有效种群规模（N_e）与人口普查规模（N）的比率低。这种遗传现象通常归因于个体在生殖成功中的巨大差异，这是因为其高死亡率和与幼虫传播有关的不可预测的环境。在这项研究中，我们研究了西佛罗里达州货架上gag（Mycteroperca microlepis）的遗传变异模式，这些遗传变异跨越了定居后的少年和成年成年动物。尽管招募动态不同，年级之间的遗传差异并不明显，遗传杂乱无章的证据很少，随后的青少年队列中成年遗传多样性也没有被截断，所以几乎没有人支持个体间在繁殖成功方面的大差异，从而导致N_e / N比。实际上，在年度招聘类别中始终缺乏显着差异，这表明个体之间的生殖成功对偏斜具有抵抗力。在可能影响N_e的各种进化力中，由于捕捞压力造成的人口变化被认为是影响当前遗传变异水平的一种可能机制。

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  • 来源
    《Marine biology》 |2014年第8期|1905-1918|共14页
  • 作者

    Nathaniel K. Jue; Felicia C. Coleman; Christopher C. Koenig;

  • 作者单位

    Department of Biological Science, Florida State University, Tallahassee, FL 32303, USA,Department of Molecular and Cell Biology, University of Connecticut, 354 Mansfield Rd., Storrs, CT 06269, USA;

    Department of Biological Science, Florida State University, Tallahassee, FL 32303, USA;

    Department of Biological Science, Florida State University, Tallahassee, FL 32303, USA;

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