Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua
Abstract Wright, P. J., Millar, C. P., and Gibb, F. M. 2011. Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua. – ICES Journal of Marine Science, 68: 1918–1927. Differences in maturation schedules from three subpopulations of North Sea cod (Gadus morhua) were examined usin...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsr111 http://academic.oup.com/icesjms/article-pdf/68/9/1918/29140938/fsr111.pdf |
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croxfordunivpr:10.1093/icesjms/fsr111 2024-09-15T17:55:26+00:00 Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua Wright, Peter J. Millar, Colin P. Gibb, Fiona M. 2011 http://dx.doi.org/10.1093/icesjms/fsr111 http://academic.oup.com/icesjms/article-pdf/68/9/1918/29140938/fsr111.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 68, issue 9, page 1918-1927 ISSN 1095-9289 1054-3139 journal-article 2011 croxfordunivpr https://doi.org/10.1093/icesjms/fsr111 2024-08-12T04:25:09Z Abstract Wright, P. J., Millar, C. P., and Gibb, F. M. 2011. Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua. – ICES Journal of Marine Science, 68: 1918–1927. Differences in maturation schedules from three subpopulations of North Sea cod (Gadus morhua) were examined using the demographic probabilistic maturation reaction norm (PMRN) approach. Declines in maturation probability with size and age were evident within the North Sea cod stock, but the magnitude of decline differed among subpopulations. The difference in the rate of decline led to significant spatial differences in recent times. Changes in maturation probability could not be explained by colonization from adjacent regions indicating a local response to conditions. The greatest decline in maturation probability followed the near collapse of regional spawning biomass during the 1980s and 1990s. A new methodology was developed to integrate the effects of temperature and competitive biomass into the estimation of the PMRN. Temperature had a positive effect on maturation probability, but could only partially explain the decreasing trend in PMRN midpoints. Consequently, regional selection for early maturing genotypes provides the most parsimonious explanation for the declines in maturation probability observed. The difference in maturation probability among North Sea cod subpopulations, and the additive contribution of temperature to the estimation of change, underscores the need to account for population structuring and to incorporate temperature as a covariate in future applications of the PMRN. Article in Journal/Newspaper atlantic cod Gadus morhua Oxford University Press ICES Journal of Marine Science 68 9 1918 1927 |
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Oxford University Press |
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English |
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Abstract Wright, P. J., Millar, C. P., and Gibb, F. M. 2011. Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua. – ICES Journal of Marine Science, 68: 1918–1927. Differences in maturation schedules from three subpopulations of North Sea cod (Gadus morhua) were examined using the demographic probabilistic maturation reaction norm (PMRN) approach. Declines in maturation probability with size and age were evident within the North Sea cod stock, but the magnitude of decline differed among subpopulations. The difference in the rate of decline led to significant spatial differences in recent times. Changes in maturation probability could not be explained by colonization from adjacent regions indicating a local response to conditions. The greatest decline in maturation probability followed the near collapse of regional spawning biomass during the 1980s and 1990s. A new methodology was developed to integrate the effects of temperature and competitive biomass into the estimation of the PMRN. Temperature had a positive effect on maturation probability, but could only partially explain the decreasing trend in PMRN midpoints. Consequently, regional selection for early maturing genotypes provides the most parsimonious explanation for the declines in maturation probability observed. The difference in maturation probability among North Sea cod subpopulations, and the additive contribution of temperature to the estimation of change, underscores the need to account for population structuring and to incorporate temperature as a covariate in future applications of the PMRN. |
format |
Article in Journal/Newspaper |
author |
Wright, Peter J. Millar, Colin P. Gibb, Fiona M. |
spellingShingle |
Wright, Peter J. Millar, Colin P. Gibb, Fiona M. Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua |
author_facet |
Wright, Peter J. Millar, Colin P. Gibb, Fiona M. |
author_sort |
Wright, Peter J. |
title |
Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua |
title_short |
Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua |
title_full |
Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua |
title_fullStr |
Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua |
title_full_unstemmed |
Intrastock differences in maturation schedules of Atlantic cod, Gadus morhua |
title_sort |
intrastock differences in maturation schedules of atlantic cod, gadus morhua |
publisher |
Oxford University Press (OUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1093/icesjms/fsr111 http://academic.oup.com/icesjms/article-pdf/68/9/1918/29140938/fsr111.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
ICES Journal of Marine Science volume 68, issue 9, page 1918-1927 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsr111 |
container_title |
ICES Journal of Marine Science |
container_volume |
68 |
container_issue |
9 |
container_start_page |
1918 |
op_container_end_page |
1927 |
_version_ |
1810431729709613056 |