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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Published in:FACETS
Main Authors: Loïc Baulier, M. Joanne Morgan, George R. Lilly, Ulf Dieckmann, Mikko Heino
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2017
Subjects:
psy
Online Access:https://doi.org/10.1139/facets-2017-0005
https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6
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spelling fttriple:oai:gotriple.eu:oai:doaj.org/article:5e328b245a1c42ddb83a32224552b8d6 2023-05-15T15:26:59+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 2017-08-01 https://doi.org/10.1139/facets-2017-0005 https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6 en eng Canadian Science Publishing doi:10.1139/facets-2017-0005 2371-1671 https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6 undefined FACETS, Vol 2, Pp 660-681 (2017) reproductive investment fisheries-induced evolution Atlantic cod gonad weight envir psy Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.1139/facets-2017-0005 2023-01-22T19:12:23Z 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 Unknown FACETS 2 2 660 681
institution Open Polar
collection Unknown
op_collection_id fttriple
language English
topic reproductive investment
fisheries-induced evolution
Atlantic cod
gonad weight
envir
psy
spellingShingle reproductive investment
fisheries-induced evolution
Atlantic cod
gonad weight
envir
psy
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
envir
psy
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 doi:10.1139/facets-2017-0005
2371-1671
https://doaj.org/article/5e328b245a1c42ddb83a32224552b8d6
op_rights undefined
op_doi https://doi.org/10.1139/facets-2017-0005
container_title FACETS
container_volume 2
container_issue 2
container_start_page 660
op_container_end_page 681
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