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...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f05-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/f05-065 |
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crcansciencepubl:10.1139/f05-065 2024-09-15T17:55:24+00:00 Assessing changes in age and size at maturation in collapsing populations of Atlantic cod ( Gadus morhua) Olsen, Esben Moland Lilly, George R Heino, Mikko Morgan, M Joanne Brattey, John Dieckmann, Ulf 2005 http://dx.doi.org/10.1139/f05-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/f05-065 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 62, issue 4, page 811-823 ISSN 0706-652X 1205-7533 journal-article 2005 crcansciencepubl https://doi.org/10.1139/f05-065 2024-06-27T04:10:58Z 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 decrease with increasing latitude. Importantly, the maturation reaction norms presented here are robust to variation in survival and growth (through phenotypic plasticity) 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 Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 62 4 811 823 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
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 decrease with increasing latitude. Importantly, the maturation reaction norms presented here are robust to variation in survival and growth (through phenotypic plasticity) 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, Esben Moland Lilly, George R Heino, Mikko Morgan, M Joanne Brattey, John Dieckmann, Ulf |
spellingShingle |
Olsen, Esben Moland Lilly, George R Heino, Mikko Morgan, M Joanne Brattey, John Dieckmann, Ulf Assessing changes in age and size at maturation in collapsing populations of Atlantic cod ( Gadus morhua) |
author_facet |
Olsen, Esben Moland Lilly, George R Heino, Mikko Morgan, M Joanne Brattey, John Dieckmann, Ulf |
author_sort |
Olsen, Esben Moland |
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 |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/f05-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/f05-065 |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 62, issue 4, page 811-823 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f05-065 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
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62 |
container_issue |
4 |
container_start_page |
811 |
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823 |
_version_ |
1810431690280009728 |