Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua)
This investigation commenced by constructing principal maturation schedule equations as a function of fishing mortality (F), key biophysical factors and a term attributed to fisheries-induced adaptive change (FIAC). Following the onset of industrial trawl fishery on the model stock, Northeast Arctic...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Online Access: | https://hdl.handle.net/11250/2999725 https://doi.org/10.1139/cjfas-2021-0068 |
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ftimr:oai:imr.brage.unit.no:11250/2999725 2023-05-15T14:30:23+02:00 Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) Carl Jacob, Rørvik Bogstad, Bjarte Ottersen, Geir Kjesbu, Olav Sigurd 2022 application/pdf https://hdl.handle.net/11250/2999725 https://doi.org/10.1139/cjfas-2021-0068 eng eng Canadian Journal of Fisheries and Aquatic Sciences. 2022, 79 (4), 576-586. urn:issn:0706-652X https://hdl.handle.net/11250/2999725 https://doi.org/10.1139/cjfas-2021-0068 cristin:2014018 576-586 79 Canadian Journal of Fisheries and Aquatic Sciences 4 Peer reviewed Journal article 2022 ftimr https://doi.org/10.1139/cjfas-2021-0068 2022-06-22T22:40:31Z This investigation commenced by constructing principal maturation schedule equations as a function of fishing mortality (F), key biophysical factors and a term attributed to fisheries-induced adaptive change (FIAC). Following the onset of industrial trawl fishery on the model stock, Northeast Arctic cod (NEAC; Gadus morhua) (1934–2020), F on immature age group 5–8 years (F5-8) increased and mean age at 50% maturity (A50) decreased from ≈10 years in the late 1940s to ≈7 years today. Large annual fluctuations in total stock biomass (TSB), sea temperature (KolaT) and F5-8 were used to better understand A50 responses. In the model, the annual accumulation of F5-8 drives FIAC. The model includes the option that NEAC may sustain F5-8 up to a certain level (F_bal) before FIAC becomes statistically evident, with F_bal falling between 0.00 and 0.40 for A50. This dynamic range in F_bal indicates a sophisticated, underlying adaptive response. Independent of F_bal, our analysis clarifies that FIAC is necessary to explain the observed changes in A50. publishedVersion Article in Journal/Newspaper Arctic cod Arctic Gadus morhua Northeast Arctic cod Institute for Marine Research: Brage IMR Arctic Canadian Journal of Fisheries and Aquatic Sciences 79 4 576 586 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
This investigation commenced by constructing principal maturation schedule equations as a function of fishing mortality (F), key biophysical factors and a term attributed to fisheries-induced adaptive change (FIAC). Following the onset of industrial trawl fishery on the model stock, Northeast Arctic cod (NEAC; Gadus morhua) (1934–2020), F on immature age group 5–8 years (F5-8) increased and mean age at 50% maturity (A50) decreased from ≈10 years in the late 1940s to ≈7 years today. Large annual fluctuations in total stock biomass (TSB), sea temperature (KolaT) and F5-8 were used to better understand A50 responses. In the model, the annual accumulation of F5-8 drives FIAC. The model includes the option that NEAC may sustain F5-8 up to a certain level (F_bal) before FIAC becomes statistically evident, with F_bal falling between 0.00 and 0.40 for A50. This dynamic range in F_bal indicates a sophisticated, underlying adaptive response. Independent of F_bal, our analysis clarifies that FIAC is necessary to explain the observed changes in A50. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Carl Jacob, Rørvik Bogstad, Bjarte Ottersen, Geir Kjesbu, Olav Sigurd |
spellingShingle |
Carl Jacob, Rørvik Bogstad, Bjarte Ottersen, Geir Kjesbu, Olav Sigurd Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) |
author_facet |
Carl Jacob, Rørvik Bogstad, Bjarte Ottersen, Geir Kjesbu, Olav Sigurd |
author_sort |
Carl Jacob, Rørvik |
title |
Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) |
title_short |
Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) |
title_full |
Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) |
title_fullStr |
Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) |
title_full_unstemmed |
Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua) |
title_sort |
long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of northeast arctic cod (gadus morhua) |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/2999725 https://doi.org/10.1139/cjfas-2021-0068 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
op_source |
576-586 79 Canadian Journal of Fisheries and Aquatic Sciences 4 |
op_relation |
Canadian Journal of Fisheries and Aquatic Sciences. 2022, 79 (4), 576-586. urn:issn:0706-652X https://hdl.handle.net/11250/2999725 https://doi.org/10.1139/cjfas-2021-0068 cristin:2014018 |
op_doi |
https://doi.org/10.1139/cjfas-2021-0068 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
79 |
container_issue |
4 |
container_start_page |
576 |
op_container_end_page |
586 |
_version_ |
1766304232293531648 |