Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua)
By estimating probabilistic reaction norms for age and size at maturation, we show that maturation schedules of Atlantic cod (Gadus morhua) off Labrador and Newfoundland shifted toward earlier ages and smaller sizes during the late 1980s and early 1990s, when these populations underwent a severe col...
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ftiiasalaxendare:oai:pure.iiasa.ac.at:7510 2023-05-15T15:27:08+02:00 Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) Olsen, E.M. Lilly, G.R. Heino, M. Morgan, M.J. Brattey, J. Dieckmann, U. 2005-04 http://pure.iiasa.ac.at/id/eprint/7510/ unknown NRC Research Press Olsen, E.M. <http://pure.iiasa.ac.at/view/iiasa/1490.html>, Lilly, G.R., Heino, M. <http://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Morgan, M.J., Brattey, J., & Dieckmann, U. <http://pure.iiasa.ac.at/view/iiasa/66.html> orcid:0000-0001-7089-0393 (2005). Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua). Canadian Journal of Fisheries and Aquatic Sciences 62 (4) 811-823. 10.1139/f05-065 <https://doi.org/10.1139/f05-065>. Article PeerReviewed 2005 ftiiasalaxendare 2022-04-15T12:32:04Z By estimating probabilistic reaction norms for age and size at maturation, we show that maturation schedules of Atlantic cod (Gadus morhua) off Labrador and Newfoundland shifted toward earlier ages and smaller sizes during the late 1980s and early 1990s, when these populations underwent a severe collapse in biomass and subsequently were closed for directed commercial fishing. We also demonstrate that this trend towards maturation at younger ages and smaller sizes is halted and even shows signs of reversal during the closure of the fisheries. In addition, our analysis reveals that males tend to mature earlier and at a smaller size than females, and that maturation age and size decreases with increasing latitude. Importantly, the maturation reaction norms presented here are robust to variation in survival and growth (through phenotypic pasticity), and are thus strongly indicative of rapid evolutionary changes in cod maturation, as well as of spatial and sex- specific genetic variation. We therefore suggest that maturation reaction norms can provide helpful reference points for managing harvested populations with evolving life-histories. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis) Newfoundland |
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IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis) |
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ftiiasalaxendare |
language |
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description |
By estimating probabilistic reaction norms for age and size at maturation, we show that maturation schedules of Atlantic cod (Gadus morhua) off Labrador and Newfoundland shifted toward earlier ages and smaller sizes during the late 1980s and early 1990s, when these populations underwent a severe collapse in biomass and subsequently were closed for directed commercial fishing. We also demonstrate that this trend towards maturation at younger ages and smaller sizes is halted and even shows signs of reversal during the closure of the fisheries. In addition, our analysis reveals that males tend to mature earlier and at a smaller size than females, and that maturation age and size decreases with increasing latitude. Importantly, the maturation reaction norms presented here are robust to variation in survival and growth (through phenotypic pasticity), and are thus strongly indicative of rapid evolutionary changes in cod maturation, as well as of spatial and sex- specific genetic variation. We therefore suggest that maturation reaction norms can provide helpful reference points for managing harvested populations with evolving life-histories. |
format |
Article in Journal/Newspaper |
author |
Olsen, E.M. Lilly, G.R. Heino, M. Morgan, M.J. Brattey, J. Dieckmann, U. |
spellingShingle |
Olsen, E.M. Lilly, G.R. Heino, M. Morgan, M.J. Brattey, J. Dieckmann, U. Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) |
author_facet |
Olsen, E.M. Lilly, G.R. Heino, M. Morgan, M.J. Brattey, J. Dieckmann, U. |
author_sort |
Olsen, E.M. |
title |
Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) |
title_short |
Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) |
title_full |
Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) |
title_fullStr |
Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) |
title_full_unstemmed |
Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua) |
title_sort |
assessing changes in age and size at maturation in collapsing populations of atlantic cod (gadus morhua) |
publisher |
NRC Research Press |
publishDate |
2005 |
url |
http://pure.iiasa.ac.at/id/eprint/7510/ |
geographic |
Newfoundland |
geographic_facet |
Newfoundland |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_relation |
Olsen, E.M. <http://pure.iiasa.ac.at/view/iiasa/1490.html>, Lilly, G.R., Heino, M. <http://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Morgan, M.J., Brattey, J., & Dieckmann, U. <http://pure.iiasa.ac.at/view/iiasa/66.html> orcid:0000-0001-7089-0393 (2005). Assessing changes in age and size at maturation in collapsing populations of Atlantic cod (Gadus morhua). Canadian Journal of Fisheries and Aquatic Sciences 62 (4) 811-823. 10.1139/f05-065 <https://doi.org/10.1139/f05-065>. |
_version_ |
1766357593715900416 |