Population genetic analysis of Ensis directus unveils high genetic variation in the introduced range and reveals a new species from the NW Atlantic

Joaquin Vierna; K. Thomas Jensen; Ana M. Gonzalez-Tizon; Andres Martinez-Lage

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Population genetic analysis of Ensis directus unveils high genetic variation in the introduced range and reveals a new species from the NW Atlantic

机译：Ensis Directus的种群遗传分析揭示了引入范围内的高遗传变异，并揭示了来自西北大西洋的新物种

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We report current genetic variation of populations of the razor shell Ensis directus (Conrad 1843) (Mollusca: Bivalvia: Pharidae) in native (North American) and introduced (European) ranges using nuclear and mitochondrial sequence-based markers. We expected less variation within the introduced range, especially considering the frequent mass mortality events observed in Europe since the species was recorded for the first time in 1978. However, we found higher variation in Europe. The possible significance of temporal fluctuations of genetic variation, limited effect of random genetic drift, and multiple introductions are discussed. Interestingly, the multiple-introduction hypothesis contrasts with the gradual colonisation of European coastal waters but is supported by trained clustering analysis and by the intensity of transatlantic shipping. Genetic and morphometric evidence strongly supports that examined individuals from a supposed E. directus population from Newfoundland (Canada) belong to a separate species. This new Ensis is formally described here and named E. terranovensis n.sp.

机译：我们报告了本地（北美）的剃刀壳Ensis directus（Conrad 1843）（软体动物：双壳纲：Pharidae）种群的当前遗传变异，并使用基于核和线粒体序列的标记引入了（欧洲）范围。我们预计引入范围内的变异较小，尤其是考虑到自1978年首次记录该物种以来在欧洲观察到的频繁的大规模死亡事件。但是，我们在欧洲发现了较高的变异。讨论了遗传变异的时间波动，随机遗传漂移的有限影响以及多次引入的可能意义。有趣的是，多重引入假说与欧洲沿海水域的逐渐殖民形成了鲜明对比，但得到了经过训练的聚类分析和跨大西洋运输强度的支持。遗传和形态计量学证据有力地支持了对来自纽芬兰（加拿大）的直属大肠杆菌（E.directus）种群进行检查的个体属于一个单独的物种。这个新的恩西斯在这里正式描述，并命名为E. terranovensisn.sp。

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《Marine biology》 |2012年第10期|p.2209-2227|共19页
作者
Joaquin Vierna; K. Thomas Jensen; Ana M. Gonzalez-Tizon; Andres Martinez-Lage;
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Department of Molecular and Cell Biology, Evolutionary Biology Group (GIBE), Universidade da Coruna, A Fraga 10, 15008 A Coruna, Spain,AHGenetics, Edificio de Servicios Centrales de Investigacion, Campus de Elvina s, 15008 A Coruna, Spain;

Marine Ecology, Department of Bioscience, Aarhus Universitet, Ole Worms Alle 1, Building 1135, 8000 Aarhus C, Denmark;

Department of Molecular and Cell Biology, Evolutionary Biology Group (GIBE), Universidade da Coruna, A Fraga 10, 15008 A Coruna, Spain;

Department of Molecular and Cell Biology, Evolutionary Biology Group (GIBE), Universidade da Coruna, A Fraga 10, 15008 A Coruna, Spain;

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Population genetic analysis of Ensis directus unveils high genetic variation in the introduced range and reveals a new species from the NW Atlantic

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