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首页> 美国卫生研究院文献>Evolutionary Applications >Temporal dynamics of genetic clines of invasive European green crab (Carcinus maenas) in eastern North America
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Temporal dynamics of genetic clines of invasive European green crab (Carcinus maenas) in eastern North America

机译：北美东部欧洲入侵绿蟹（Carcinus maenas）遗传种群的时空动态

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Two genetically distinct lineages of European green crabs (Carcinus maenas) were independently introduced to eastern North America, the first in the early 19th century and the second in the late 20th century. These lineages first came into secondary contact in southeastern Nova Scotia, Canada (NS), where they hybridized, producing latitudinal genetic clines. Previous studies have documented a persistent southward shift in the clines of different marker types, consistent with existing dispersal and recruitment pathways. We evaluated current clinal structure by quantifying the distribution of lineages and fine‐scale hybridization patterns across the eastern North American range (25 locations, ~39 to 49°N) using informative single nucleotide polymorphisms (SNPs; n = 96). In addition, temporal changes in the genetic clines were evaluated using mitochondrial DNA and microsatellite loci (n = 9–11) over a 15‐year period (2000–2015). Clinal structure was consistent with prior work demonstrating the existence of both northern and southern lineages with a hybrid zone occurring between southern New Brunswick (NB) and southern NS. Extensive later generation hybrids were detected in this region and in southeastern Newfoundland. Temporal genetic analysis confirmed the southward progression of clines over time; however, the rate of this progression was slower than predicted by forecasting models, and current clines for all marker types deviated significantly from these predictions. Our results suggest that neutral and selective processes contribute to cline dynamics, and ultimately, highlight how selection, hybridization, and dispersal can collectively influence invasion success.
机译：欧洲青蟹（Carcinus maenas）的两个遗传上不同的谱系被独立引入北美东部，第一个在19世纪初，第二个在20世纪后期。这些血统首先在加拿大新斯科舍省东南部（NS）进行了二次接触，在那里杂交，产生了纬度遗传系。先前的研究已经证明，不同标记类型的谱系持续向南移动，与现有的扩散和募集途径一致。我们通过使用信息性单核苷酸多态性（SNPs; n = 96）对北美东部范围（25个位置，〜39至49°N）的谱系和精细杂交模式进行定量分布来评估当前的脊椎结构。此外，使用线粒体DNA和微卫星基因座（n = 9-11）在15年期间（2000-2015年）评估了遗传系的时间变化。脊柱结构与先前的工作一致，表明北部和南部血统都存在，并且在新不伦瑞克南部（NB）和南部南部之间存在混合带。在该地区和纽芬兰东南部发现了大量的后代杂种。时间遗传分析证实了随着时间的流逝，氏族向南发展。但是，这种进展的速度比预测模型所预测的要慢，并且所有标记物类型的当前谱线均与这些预测显着不同。我们的结果表明，中性和选择性过程有助于细胞系动力学，并最终突显出选择，杂交和扩散如何共同影响入侵成功。

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