Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes
The relative roles of density dependence and life history evolution in contributing to rapid fisheries-induced trait changes remain debated. In the 1930s, northeast Arctic cod (Gadus morhua), currently the world’s largest cod stock, experienced a shift from a traditional spawning-ground fishery to a...
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National Academy of Sciences
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Online Access: | https://pure.iiasa.ac.at/id/eprint/14117/ https://pure.iiasa.ac.at/id/eprint/14117/1/PNAS-2016-Eikeset-15030-5.pdf https://doi.org/10.1073/pnas.1525749113 |
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ftiiasalaxenburg:oai:pure.iiasa.ac.at:14117 2023-05-15T14:30:25+02:00 Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes Eikeset, A.M. Dunlop, E.S. Heino, M. Storvik, Geir Stenseth, N.C. Dieckmann, U. 2016 text https://pure.iiasa.ac.at/id/eprint/14117/ https://pure.iiasa.ac.at/id/eprint/14117/1/PNAS-2016-Eikeset-15030-5.pdf https://doi.org/10.1073/pnas.1525749113 en eng National Academy of Sciences https://pure.iiasa.ac.at/id/eprint/14117/1/PNAS-2016-Eikeset-15030-5.pdf Eikeset, A.M., Dunlop, E.S., Heino, M. <https://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Storvik, Geir, Stenseth, N.C., & Dieckmann, U. <https://pure.iiasa.ac.at/view/iiasa/66.html> orcid:0000-0001-7089-0393 (2016). Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes. Proceedings of the National Academy of Sciences 113 (52) 15030-15035. 10.1073/pnas.1525749113 <https://doi.org/10.1073/pnas.1525749113>. doi:10.1073/pnas.1525749113 cc_by_nc Article PeerReviewed 2016 ftiiasalaxenburg https://doi.org/10.1073/pnas.1525749113 2023-04-07T14:52:24Z The relative roles of density dependence and life history evolution in contributing to rapid fisheries-induced trait changes remain debated. In the 1930s, northeast Arctic cod (Gadus morhua), currently the world’s largest cod stock, experienced a shift from a traditional spawning-ground fishery to an industrial trawl fishery with elevated exploitation in the stock’s feeding grounds. Since then, age and length at maturation have declined dramatically, a trend paralleled in other exploited stocks worldwide. These trends can be explained by demographic truncation of the population’s age structure, phenotypic plasticity in maturation arising through density-dependent growth, fisheries-induced evolution favoring faster-growing or earlier-maturing fish, or a combination of these processes. Here, we use a multitrait eco-evolutionary model to assess the capacity of these processes to reproduce 74 y of historical data on age and length at maturation in northeast Arctic cod, while mimicking the stock’s historical harvesting regime. Our results show that model predictions critically depend on the assumed density dependence of growth: when this is weak, life history evolution might be necessary to prevent stock collapse, whereas when a stronger density dependence estimated from recent data is used, the role of evolution in explaining fisheries-induced trait changes is diminished. Our integrative analysis of density-dependent growth, multitrait evolution, and stock-specific time series data underscores the importance of jointly considering evolutionary and ecological processes, enabling a more comprehensive perspective on empirically observed stock dynamics than previous studies could provide. Article in Journal/Newspaper Arctic cod Arctic Gadus morhua Northeast Arctic cod IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository) Arctic Proceedings of the National Academy of Sciences 113 52 15030 15035 |
institution |
Open Polar |
collection |
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository) |
op_collection_id |
ftiiasalaxenburg |
language |
English |
description |
The relative roles of density dependence and life history evolution in contributing to rapid fisheries-induced trait changes remain debated. In the 1930s, northeast Arctic cod (Gadus morhua), currently the world’s largest cod stock, experienced a shift from a traditional spawning-ground fishery to an industrial trawl fishery with elevated exploitation in the stock’s feeding grounds. Since then, age and length at maturation have declined dramatically, a trend paralleled in other exploited stocks worldwide. These trends can be explained by demographic truncation of the population’s age structure, phenotypic plasticity in maturation arising through density-dependent growth, fisheries-induced evolution favoring faster-growing or earlier-maturing fish, or a combination of these processes. Here, we use a multitrait eco-evolutionary model to assess the capacity of these processes to reproduce 74 y of historical data on age and length at maturation in northeast Arctic cod, while mimicking the stock’s historical harvesting regime. Our results show that model predictions critically depend on the assumed density dependence of growth: when this is weak, life history evolution might be necessary to prevent stock collapse, whereas when a stronger density dependence estimated from recent data is used, the role of evolution in explaining fisheries-induced trait changes is diminished. Our integrative analysis of density-dependent growth, multitrait evolution, and stock-specific time series data underscores the importance of jointly considering evolutionary and ecological processes, enabling a more comprehensive perspective on empirically observed stock dynamics than previous studies could provide. |
format |
Article in Journal/Newspaper |
author |
Eikeset, A.M. Dunlop, E.S. Heino, M. Storvik, Geir Stenseth, N.C. Dieckmann, U. |
spellingShingle |
Eikeset, A.M. Dunlop, E.S. Heino, M. Storvik, Geir Stenseth, N.C. Dieckmann, U. Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
author_facet |
Eikeset, A.M. Dunlop, E.S. Heino, M. Storvik, Geir Stenseth, N.C. Dieckmann, U. |
author_sort |
Eikeset, A.M. |
title |
Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
title_short |
Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
title_full |
Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
title_fullStr |
Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
title_full_unstemmed |
Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
title_sort |
roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes |
publisher |
National Academy of Sciences |
publishDate |
2016 |
url |
https://pure.iiasa.ac.at/id/eprint/14117/ https://pure.iiasa.ac.at/id/eprint/14117/1/PNAS-2016-Eikeset-15030-5.pdf https://doi.org/10.1073/pnas.1525749113 |
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_relation |
https://pure.iiasa.ac.at/id/eprint/14117/1/PNAS-2016-Eikeset-15030-5.pdf Eikeset, A.M., Dunlop, E.S., Heino, M. <https://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Storvik, Geir, Stenseth, N.C., & Dieckmann, U. <https://pure.iiasa.ac.at/view/iiasa/66.html> orcid:0000-0001-7089-0393 (2016). Roles of density-dependent growth and life history evolution in accounting for fisheries-induced trait changes. Proceedings of the National Academy of Sciences 113 (52) 15030-15035. 10.1073/pnas.1525749113 <https://doi.org/10.1073/pnas.1525749113>. doi:10.1073/pnas.1525749113 |
op_rights |
cc_by_nc |
op_doi |
https://doi.org/10.1073/pnas.1525749113 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
113 |
container_issue |
52 |
container_start_page |
15030 |
op_container_end_page |
15035 |
_version_ |
1766304256924581888 |