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Multiple spatially distinct introductions and not range expansion may explain colonization history in a non-native marine shrimp

机译：在空间上不同的引入而不是范围的扩大可能解释了非本地海虾的定殖历史

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Biological invasions are often characterized by a phase of post-establishment expansion in which the invading species increases its range through colonization of new geographic areas. These expansions are predicted to result in specific genetic signatures, most notably decreased genetic diversity with distance from the point of introduction. The Asian caridean shrimp Palaemon macrodactylus is an introduced species in many regions of the globe. It has most recently invaded the U.S. Atlantic coast, with the first reported sighting in New York in 2001. This study used mitochondrial cytochrome oxidase I sequence data and data for 1598 single-nucleotide polymorphisms generated through restriction enzyme-associated DNA sequencing to evaluate two potential invasion mechanisms describing the spread of P. macrodactylus north of New York: the first based on a single introduction followed by range expansion facilitated by ocean currents, coastal transport, and physical environment; the second based on multiple introductions from overseas into different ports along the coast. We compare population genetic results to predictions of genetic patterns for each of these potential invasion pathways. Results do not support range expansion in which diversity decreases with distance from the point of first detection. Rather, the data suggest that multiple introductions may have taken place with population genomic diversity increasing with distance from New York, and peaks of mitochondrial diversity in populations collected from New York and the Boston-Plymouth coastline. These results indicate that multiple human-mediated dispersal events may be as important as oceanographic and life history considerations during the colonization phases of a marine invasion.
机译：生物入侵通常以建立后扩张阶段为特征，其中入侵物种通过定居新地理区域来扩大其范围。预计这些扩展会导致特定的遗传特征，最显着的是随着距引入点的距离而降低了遗传多样性。亚洲caridean虾Palaemon macrodactylus是全球许多地区的引进物种。它最近入侵美国大西洋沿岸，于2001年在纽约首次被发现。该研究使用了线粒体细胞色素氧化酶I序列数据，以及通过限制性内切酶相关DNA测序产生的1598个单核苷酸多态性数据，以评估两种潜在的入侵机制描述了大指对虾在纽约北部的扩散：第一种基于一次引入，然后由于洋流，沿海运输和自然环境而促进范围扩大的机制；第二个是基于从海外向沿海不同港口的多次介绍。我们将人口遗传结果与这些潜在入侵途径中每一种的遗传模式预测进行比较。结果不支持范围扩展，在范围扩展中，多样性随着从首次检测点到距离的增加而减小。相反，数据表明，随着距纽约的距离人口基因组多样性的增加，以及从纽约和波士顿-普利茅斯海岸线收集的人群中线粒体多样性的峰值，可能已经进行了多次引入。这些结果表明，在海洋入侵的殖民化阶段，多种人类介导的扩散事件与海洋学和生命史考虑因素一样重要。

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    《Marine biology》 |2019年第5期|67.1-67.13|共13页
  • 作者

    Bors Eleanor K.; Carlton James T.; Shank Timothy M.;

  • 作者单位

    Oregon State Univ, Hatfield Marine Sci Ctr, Dept Fisheries & Wildlife, Newport, OR 97365 USA|Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA;

    Williams Coll, Mystic Seaport Maritime Studies Program, Mystic, CT 06355 USA;

    Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA;

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