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Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod

Fish populations may spawn a vast number of offspring, while only a small and highly variable fraction of a new cohort survives long enough to enter into the fisheries as recruits. It is intuitive that the size and state of the spawning stock, the adult part of the fish population, is important for...

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Autores principales: Ottersen, Geir, Holt, Rebecca E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10087206/
https://www.ncbi.nlm.nih.gov/pubmed/37063112
http://dx.doi.org/10.1111/fog.12605
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author Ottersen, Geir
Holt, Rebecca E.
author_facet Ottersen, Geir
Holt, Rebecca E.
author_sort Ottersen, Geir
collection PubMed
description Fish populations may spawn a vast number of offspring, while only a small and highly variable fraction of a new cohort survives long enough to enter into the fisheries as recruits. It is intuitive that the size and state of the spawning stock, the adult part of the fish population, is important for recruitment. Additionally, environmental conditions can greatly influence survival through vulnerable early life stages until recruitment. To understand what regulates recruitment, an essential part of fish population dynamics, it is thus necessary to explain the impact of fluctuations in both spawning stock and environment, including interactions. Here, we examine if the connection between the environment and recruitment is affected by the state of the spawning stock, including biomass, mean age and age diversity. Specifically, we re‐evaluate the hypothesis stating that recruitment from a spawning stock dominated by young fish and few age classes is more vulnerable to environmental fluctuations. We expand upon earlier work on the Barents Sea stock of Atlantic cod, now with data series extended in time both backwards and forwards to cover the period 1922–2019. While our findings are correlative and cannot prove a specific cause and effect mechanism, they support earlier work and strengthen the evidence for the hypothesis above. Furthermore, this study supports that advice to fisheries management should include considerations of environmental status.
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spelling pubmed-100872062023-04-12 Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod Ottersen, Geir Holt, Rebecca E. Fish Oceanogr Special Issue Articles Fish populations may spawn a vast number of offspring, while only a small and highly variable fraction of a new cohort survives long enough to enter into the fisheries as recruits. It is intuitive that the size and state of the spawning stock, the adult part of the fish population, is important for recruitment. Additionally, environmental conditions can greatly influence survival through vulnerable early life stages until recruitment. To understand what regulates recruitment, an essential part of fish population dynamics, it is thus necessary to explain the impact of fluctuations in both spawning stock and environment, including interactions. Here, we examine if the connection between the environment and recruitment is affected by the state of the spawning stock, including biomass, mean age and age diversity. Specifically, we re‐evaluate the hypothesis stating that recruitment from a spawning stock dominated by young fish and few age classes is more vulnerable to environmental fluctuations. We expand upon earlier work on the Barents Sea stock of Atlantic cod, now with data series extended in time both backwards and forwards to cover the period 1922–2019. While our findings are correlative and cannot prove a specific cause and effect mechanism, they support earlier work and strengthen the evidence for the hypothesis above. Furthermore, this study supports that advice to fisheries management should include considerations of environmental status. John Wiley and Sons Inc. 2022-08-15 2023-01 /pmc/articles/PMC10087206/ /pubmed/37063112 http://dx.doi.org/10.1111/fog.12605 Text en © 2022 The Authors. Fisheries Oceanography published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Special Issue Articles
Ottersen, Geir
Holt, Rebecca E.
Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod
title Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod
title_full Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod
title_fullStr Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod
title_full_unstemmed Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod
title_short Long‐term variability in spawning stock age structure influences climate–recruitment link for Barents Sea cod
title_sort long‐term variability in spawning stock age structure influences climate–recruitment link for barents sea cod
topic Special Issue Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10087206/
https://www.ncbi.nlm.nih.gov/pubmed/37063112
http://dx.doi.org/10.1111/fog.12605
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