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:7814 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. 2005-03 text http://pure.iiasa.ac.at/id/eprint/7814/ http://pure.iiasa.ac.at/id/eprint/7814/1/IR-05-021.pdf en eng IR-05-021 http://pure.iiasa.ac.at/id/eprint/7814/1/IR-05-021.pdf 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). IIASA Interim Report. IIASA, Laxenburg, Austria: IR-05-021 Monograph NonPeerReviewed 2005 ftiiasalaxendare 2022-04-15T12:32:17Z 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. Book 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 |
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 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 |
Book |
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 |
IR-05-021 |
publishDate |
2005 |
url |
http://pure.iiasa.ac.at/id/eprint/7814/ http://pure.iiasa.ac.at/id/eprint/7814/1/IR-05-021.pdf |
geographic |
Newfoundland |
geographic_facet |
Newfoundland |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_relation |
http://pure.iiasa.ac.at/id/eprint/7814/1/IR-05-021.pdf 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). IIASA Interim Report. IIASA, Laxenburg, Austria: IR-05-021 |
_version_ |
1766357593895206912 |