The genetic composition of feeding aggregations of the Atlantic mackerel (Scomber scombrus) in the central north Atlantic: a microsatellite loci approach - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ICES Journal of Marine Science Année : 2020

The genetic composition of feeding aggregations of the Atlantic mackerel (Scomber scombrus) in the central north Atlantic: a microsatellite loci approach

Davio Gislason
  • Fonction : Auteur
Sarah J Helyar
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Guðmundur J Oskarsson
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Guðbjorg Olafsdottir
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Slotte Aril
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Teunis Jensen
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Jan Arge Jacobsen
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Kristinn Olafsson
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Sigurlaug Skirnisdottir
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Geir Dahle
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Helle Siegstad
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Horaldur Joensen
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Kiersten L. Curti
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François Gregoire
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Sæmundur Sveinsson
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Anna Kristın Danıelsdottir
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Christophe Pampoulie
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Résumé

The impacts of climate change on marine ecosystems can be seen in the changing distribution, migration, and abundance of species in the oceans. For some species this changing environment may be beneficial and can support population expansions. In the northeast Atlantic (NEA), the Atlantic mackerel (Scomber scombrus) is undergoing an increase in stock size accompanied by changing summer migration patterns, which have resulted in an expansion further north and north west than previously recorded. This study uses microsatellite loci to confirm the differentiation among NEA and northwest Atlantic (NWA) mackerel spawning populations and to assess the level of structuring within these populations. In addition, to enable population-specific exploitation rates to be factored into fisheries management, we identified the origin of individuals composing the expanding feeding aggregations in the central north Atlantic (Greenland, Iceland, Faroes), with all aggregations tested originating from spawning populations in the NEA. This study showed that microsatellite loci were useful to assess the contribution of NEA and NWA populations to mixed feeding aggregations across the north Atlantic for large pelagic fish stocks but were not powerful enough to evaluate the specific contribution of known stocks within NEA and NWA.

Dates et versions

hal-04202515 , version 1 (11-09-2023)

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Davio Gislason, Sarah J Helyar, Guðmundur J Oskarsson, Guðbjorg Olafsdottir, Slotte Aril, et al.. The genetic composition of feeding aggregations of the Atlantic mackerel (Scomber scombrus) in the central north Atlantic: a microsatellite loci approach. ICES Journal of Marine Science, 2020, 77 (2), pp.604-612. ⟨10.1093/icesjms/fsaa003⟩. ⟨hal-04202515⟩
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