Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Coastal Atlantic cod (Gadus morhua) in the Northeast Atlantic has seen a continuous decline since the industrialization of the coastal fishery, and management needs to address the spatial and temporal complexities of coexisting cod stocks. Toward that end, genetic analyses and oceanographic modelling of coastal and oceanic cod larval drift patterns were combined to elucidate the mechanisms responsible for an observed genetic cline over a >1500 km stretch along the coast of Norway. The results indicate that the north–south cline in coastal cod represents an extended contact zone between genetically divergent North Sea and Northeast Arctic cod and is maintained by two-way gene flow: by northward drift of pelagic eggs and larvae and by southward spawning migrations of Northeast Arctic cod. Computer simulations verify that the genetic cline can be established rapidly if gene flow into coastal populations is substantial. The shape of the cline, on the other hand, was found to be largely insensitive to the total amount of gene flow and therefore carries little information on extent of gene flow into and among coastal populations.

中文翻译：

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基因系的形成：海洋基因渗入东北大西洋沿海鳕鱼种群

加拿大渔业和水产科学杂志，提前印刷。
自沿海渔业工业化以来，东北大西洋的沿海大西洋鳕鱼 (Gadus morhua) 数量持续下降，管理需要解决共存鳕鱼种群的时空复杂性。为此，将沿海和海洋鳕鱼幼虫漂流模式的遗传分析和海洋学建模结合起来，阐明了在挪威海岸超过 1500 公里的范围内观察到的遗传链的机制。结果表明，沿海鳕鱼的南北走向代表了北海鳕鱼和北极东北部鳕鱼之间的延伸接触区，并由两种基因流动维持：远洋卵和幼虫向北漂移，以及向南产卵迁移。东北北极鳕鱼。计算机模拟证实，如果基因大量流入沿海种群，则可以迅速建立遗传链。另一方面，发现基因组的形状对基因流的总量不敏感，因此几乎没有关于基因流入和沿海种群之间的程度的信息。