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Stable coexistence of genetically divergent Atlantic cod ecotypes at multiple spatial scales

Journal article
Authors H. Knutsen
P. E. Jorde
J. A. Hutchings
J. Hemmer-Hansen
P. Gronkjaer
K. E. M. Jorgensen
Carl André
M. Sodeland
J. Albretsen
E. M. Olsen
Published in Evolutionary Applications
Volume 11
Issue 9
Pages 1527-1539
ISSN 1752-4571
Publication year 2018
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Pages 1527-1539
Language en
Keywords Atlantic cod, connectivity, dispersal, ecotypes, natural selection, sympatry, temporal genetic stability, gadus-morhua l., local adaptation, north-sea, chromosomal, rearrangements, population-structure, stationary ecotypes, genomic, divergence, natural-selection, marine fishes, growth-rate, Evolutionary Biology, ates of america, v108, p1961
Subject categories Marine ecology


Coexistence in the same habitat of closely related yet genetically different populations is a phenomenon that challenges our understanding of local population structure and adaptation. Identifying the underlying mechanisms for such coexistence can yield new insight into adaptive evolution, diversification and the potential for organisms to adapt and persist in response to a changing environment. Recent studies have documented cryptic, sympatric populations of Atlantic cod (Gadus morhua) in coastal areas. We analysed genetic origin of 6,483 individual cod sampled annually over 14 years from 125 locations along the Norwegian Skagerrak coast and document stable coexistence of two genetically divergent Atlantic cod ecotypes throughout the study area and study period. A "fjord" ecotype dominated in numbers deep inside fjords while a "North Sea" ecotype was the only type found in offshore North Sea. Both ecotypes coexisted in similar proportions throughout coastal habitats at all spatial scales. The size-at-age of the North Sea ecotype on average exceeded that of the fjord ecotype by 20% in length and 80% in weight across all habitats. Different growth and size among individuals of the two types might be one of several ecologically significant variables that allow for stable coexistence of closely related populations within the same habitat. Management plans, biodiversity initiatives and other mitigation strategies that do not account for the mixture of species ecotypes are unlikely to meet objectives related to the sustainability of fish and fisheries.

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