The making of a genetic cline: introgression of oceanic genes into coastal cod populations in the Northeast Atlantic

Abstract: 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 oceanographi...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Jorde, Per Erik, Huserbråten, Mats Brockstedt Olsen, Seliussen, Bjørghild Breistein, Myksvoll, Mari Skuggedal, Vikebø, Frode Bendiksen, Dahle, Geir, Aglen, Asgeir, Johansen, Torild
Format: Article in Journal/Newspaper
Language:English
Published: 2021
Subjects:
Fiskeriforvaltning
Fisheries Management
Populasjonsgenetikk
Population genetics
VDP::Matematikk og naturvitenskap: 400
VDP::Mathematics and natural scienses: 400
Arctic
Norway
Arctic cod
atlantic cod
Gadus morhua
Northeast Arctic cod
Northeast Atlantic
Online Access:https://hdl.handle.net/11250/2787399
https://doi.org/10.1139/cjfas-2020-0380
Description
Summary:Abstract: 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 north­south 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. publishedVersion

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