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

Davið Gíslason, Sarah J. Helyar, Guðmundur J. Óskarsson, Guðbjörg Ólafsdóttir, Aril Slotte, Teunis Jansen, Jan Arge Jacobsen, Kristinn Ólafsson, Sigurlaug Skirnisdottir, Geir Dahle, Helle Siegstad, Hóraldur Joensen, Kiersten L. Curti, François Grégoire, Jacques Masse, Sæmundur Sveinsson, Anna Kristín Daníelsdóttir, Christophe Pampoulie*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
Article numberfsaa003
JournalICES Journal of Marine Science
Volume77
Issue number2
Pages (from-to)604-612
Number of pages9
ISSN1054-3139
DOIs
Publication statusPublished - 2020

Keywords

  • Atlantic mackerel
  • Feeding grounds composition
  • Microsatellite loci
  • Migration
  • Population structure

Cite this

Gíslason, D., Helyar, S. J., Óskarsson, G. J., Ólafsdóttir, G., Slotte, A., Jansen, T., Jacobsen, J. A., Ólafsson, K., Skirnisdottir, S., Dahle, G., Siegstad, H., Joensen, H., Curti, K. L., Grégoire, F., Masse, J., Sveinsson, S., Daníelsdóttir, A. K., & Pampoulie, C. (2020). 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, 77(2), 604-612. [fsaa003]. https://doi.org/10.1093/icesjms/fsaa003