Range-wide population structure and history of the northern quahog (Merceneria merceneria) inferred from mitochondrial DNA sequence data
Range-wide population structure and history of the northern quahog (Merceneria merceneria) inferred from mitochondrial DNA sequence data
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DOI：
10.1093/icesjms/fsn007
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发表时间：
2008-03-01
影响因子：
3.3
通讯作者：
Baker, Shirley M.
中科院分区：
文献类型：
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作者：
Baker, Patrick;Austin, James D.;Baker, Shirley M.
北方圆蛤（Mercenaria Mercenaria）是一种具有重要商业价值的双壳类动物，分布于从佛罗里达州到新斯科舍省的西北大西洋地区。我们报告了基于 528 bp 的线粒体 COI 基因，对 M. Mercenaria 分布范围内的 10 个位置进行的群体遗传分析（n = 297）。我们的分析没有发现神秘进化谱系的证据，但种群结构适度（phi(ST) = 0.0213；p = 0.0019），在哈特拉斯角有显着的分区，在科德角有弱支持的分区。来自佛罗里达州西海岸（墨西哥湾）的样本与大多数大西洋种群没有显着差异，尽管沿南佛罗里达州的分布差距有 600 公里，并且卡纳维拉尔角有详细记录的生物地理断裂。这些发现支持了这样的论点：墨西哥湾的人口是最近引入的产物。哈特拉斯以北的样本多样性随着纬度的增加而减少，可能表明冰期后范围的扩展，这一结论得到了表明种群扩张的高度显着的 Fu 的 F 统计量（-99.14；p < 0.001）的支持。大西洋的雇佣鱼种群包括一个单一的进化单位，分为至少三个密切相关的种群，尽管这并不排除北部、中部和南部种群之间的区域适应性差异。
The northern quahog (Mercenaria mercenaria) is a commercially important bivalve distributed in the NW Atlantic from Florida to Nova Scotia. We report on population genetic analyses, based on 528 bp of mitochondrial COI gene, for 10 locations across the range of M. mercenaria (n = 297). Our analyses revealed no evidence of cryptic evolutionary lineages, but modest population structure (phi(ST) = 0.0213; p = 0.0019) with a significant partition at Cape Hatteras and a weakly supported partition at Cape Cod. Samples from the west coast of Florida (Gulf of Mexico) were not significantly different from most Atlantic populations, despite a 600 km gap in distribution along South Florida, and a well-documented biogeographic break at Cape Canaveral. These findings support the thesis that the Gulf of Mexico population is the product of a recent introduction. Samples north of Hatteras decrease in diversity with increasing latitude, probably indicating post-glacial range extension, a conclusion supported by a highly significant Fu's F-statistic (-99.14; p < 0.001) indicating population expansion. Mercenaria mercenaria stocks in the Atlantic include a single evolutionary unit divided into at least three closely related populations, though this does not preclude regional adaptive differences between northern, central, and southern populations.