Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females
Life history theory predicts selection for higher reproductive investment in response to increased mortality among mature individuals. We tested this prediction over the period from 1978 to 2013 for three populations of Atlantic cod (Gadus morhua) off Newfoundland. These populations were heavily fis...
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ftdoajarticles:oai:doaj.org/article:5e328b245a1c42ddb83a32224552b8d6 2023-05-15T15:27:01+02:00 Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females Loïc Baulier M. Joanne Morgan George R. Lilly Ulf Dieckmann Mikko Heino 2017-08-01T00:00:00Z https://doi.org/10.1139/facets-2017-0005 https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6 EN eng Canadian Science Publishing http://www.facetsjournal.com/doi/10.1139/facets-2017-0005 https://doaj.org/toc/2371-1671 doi:10.1139/facets-2017-0005 2371-1671 https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6 FACETS, Vol 2, Pp 660-681 (2017) reproductive investment fisheries-induced evolution Atlantic cod gonad weight Education L Science Q article 2017 ftdoajarticles https://doi.org/10.1139/facets-2017-0005 2023-01-08T01:24:24Z Life history theory predicts selection for higher reproductive investment in response to increased mortality among mature individuals. We tested this prediction over the period from 1978 to 2013 for three populations of Atlantic cod (Gadus morhua) off Newfoundland. These populations were heavily fished for a long period. We considered changes in standardized gonad weight as a proxy for changes in gonadal investment. We accounted for the allometry between gonad and body weight, individual body condition, water temperature, and potential spatial and density-dependent effects. Males display significant temporal trends in gonadal investment in all populations; in agreement with theoretical predictions, these trends show increased gonadal investments during the earlier part of the time series when mortality was high, with the trends leveling off or reversing after the later imposition of fishing moratoria. In contrast, females display patterns that are less consistent and expected; significant trends are detected only when accounting for density-dependent effects, with females in two populations unexpectedly showing a long-term decline in gonadal investment. Our results support the hypothesis that fisheries-induced evolution has occurred in gonadal investment in males, but not in females, and suggest that gonadal investment is more important for male reproductive success than expected in this lekking species. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Directory of Open Access Journals: DOAJ Articles FACETS 2 2 660 681 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
reproductive investment fisheries-induced evolution Atlantic cod gonad weight Education L Science Q |
spellingShingle |
reproductive investment fisheries-induced evolution Atlantic cod gonad weight Education L Science Q Loïc Baulier M. Joanne Morgan George R. Lilly Ulf Dieckmann Mikko Heino Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females |
topic_facet |
reproductive investment fisheries-induced evolution Atlantic cod gonad weight Education L Science Q |
description |
Life history theory predicts selection for higher reproductive investment in response to increased mortality among mature individuals. We tested this prediction over the period from 1978 to 2013 for three populations of Atlantic cod (Gadus morhua) off Newfoundland. These populations were heavily fished for a long period. We considered changes in standardized gonad weight as a proxy for changes in gonadal investment. We accounted for the allometry between gonad and body weight, individual body condition, water temperature, and potential spatial and density-dependent effects. Males display significant temporal trends in gonadal investment in all populations; in agreement with theoretical predictions, these trends show increased gonadal investments during the earlier part of the time series when mortality was high, with the trends leveling off or reversing after the later imposition of fishing moratoria. In contrast, females display patterns that are less consistent and expected; significant trends are detected only when accounting for density-dependent effects, with females in two populations unexpectedly showing a long-term decline in gonadal investment. Our results support the hypothesis that fisheries-induced evolution has occurred in gonadal investment in males, but not in females, and suggest that gonadal investment is more important for male reproductive success than expected in this lekking species. |
format |
Article in Journal/Newspaper |
author |
Loïc Baulier M. Joanne Morgan George R. Lilly Ulf Dieckmann Mikko Heino |
author_facet |
Loïc Baulier M. Joanne Morgan George R. Lilly Ulf Dieckmann Mikko Heino |
author_sort |
Loïc Baulier |
title |
Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females |
title_short |
Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females |
title_full |
Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females |
title_fullStr |
Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females |
title_full_unstemmed |
Reproductive investment in Atlantic cod populations off Newfoundland: Contrasting trends between males and females |
title_sort |
reproductive investment in atlantic cod populations off newfoundland: contrasting trends between males and females |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
https://doi.org/10.1139/facets-2017-0005 https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6 |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
FACETS, Vol 2, Pp 660-681 (2017) |
op_relation |
http://www.facetsjournal.com/doi/10.1139/facets-2017-0005 https://doaj.org/toc/2371-1671 doi:10.1139/facets-2017-0005 2371-1671 https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6 |
op_doi |
https://doi.org/10.1139/facets-2017-0005 |
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FACETS |
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2 |
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660 |
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681 |
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1766357484602130432 |