Zooplankton link climate to capelin and polar cod in the Barents Sea
Rattachement africain : no, ru. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Capelin (Mallotus villosus) and polar cod (Boreogadus saida) hold a fundamental position in the Barents Sea ecosystem as consumers of zooplankton while serving as forage fish for the commercial and ecological key species Atlantic cod (Gadus morhua). The ongoing warming and Atlantification of the Barents Sea, along with increasing net primary production, makes previously inaccessible northern areas available as feeding grounds for capelin. The opposite effect is anticipated for the ice-dependent polar cod. The transport of Atlantic water with boreal plankton from the Norwegian Sea is important for sustaining biodiversity and production in the Barents Sea. A decline of the medium-sized mesozooplankton biomass to a low level during 2016 to 2022 coincided with a strongly decreasing summer volume transport with the Atlantic Current. The low biomass of medium-sized zooplankton observed in later years raises concern about the feeding conditions now experienced by the higher trophic levels. Both capelin and polar cod feed predominantly on lipid rich sub-Arctic and Arctic zooplankton species. We found a significant inverse relationship between capelin and mesozooplankton biomass and a clear dietary shift from smaller to larger predator size. Smaller capelin (<12 cm) contained a comparatively higher proportion of copepods, dominated by Calanus glacialis, followed by C. finmarchicus and Metridia longa (copepodite stages IV-VI). As the capelin grow, their diet switches towards larger zooplankton, primarily euphausiids (mainly Thysanoessa inermis). All age groups of polar cod fed heavily on pelagic amphipods (mostly Themisto libellula) in addition to copepods and euphausiids, and to some degree also on fish, thus displaying a higher trophic position than capelin. Capelin growth from age 1 to 2 was negatively associated with their abundance at age 2, but positively related to stomach fullness for 2-year-old fish, indicating density-dependent growth. While our study reveals interactions between capelin and zooplankton, such signals between polar cod and their prey were not evident.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Zooplankton link climate to capelin and polar cod in the Barents Sea
- Date Crossref
- 01/08/2024
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Norwegian Institute of Marine Research pays non établi dans la noticeStructure de recherche
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Knipovich Polar Research Institute of Marine Fisheries and Oceanography pays non établi dans la noticeStructure de recherche
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National Research Tomsk State University pays non établi dans la noticeUniversité ou école supérieure
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Murmansk Arctic State University pays non établi dans la noticeUniversité ou école supérieure
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Institute of Marine Research (IMR) pays non établi dans la noticeStructure de recherche
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Polar Branch of the Federal State Budget Scientific Institution “Russian Federal Research Institute of Fisheries and Oceanography” (“PINRO” named after N.M.Knipovich) pays non établi dans la noticeStructure de recherche
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Polar Branch of the Federal State Budget Scientific Institution "Russian Federal Research Institute of Fisheries and Oceanography" ("PINRO" named after N.M.Knipovich) pays non établi dans la noticeStructure de recherche
Norwegian Institute of Marine Research, Knipovich Polar Research Institute of Marine Fisheries and Oceanography et National Research Tomsk State University, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.