Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory
Density-dependent habitat selection has implications for fisheries management and for the recovery of depleted fish populations. According to ideal free distribution theory, populations contract into areas of highest habitat suitability as their abundance decreases. This can increase their vulnerabi...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:31539 2023-05-15T15:27:11+02:00 Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory Blanchard, Julia L. Mills, Craig Jennings, Simon Fox, Clive J. Rackham, Brian D. Eastwood, Paul D. O'Brien, Carl M. 2005 https://ueaeprints.uea.ac.uk/id/eprint/31539/ https://doi.org/10.1139/f05-109 unknown Blanchard, Julia L., Mills, Craig, Jennings, Simon, Fox, Clive J., Rackham, Brian D., Eastwood, Paul D. and O'Brien, Carl M. (2005) Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory. Canadian Journal of Fisheries and Aquatic Sciences, 62 (9). pp. 2001-2009. ISSN 0706-652X doi:10.1139/f05-109 Article PeerReviewed 2005 ftuniveastangl https://doi.org/10.1139/f05-109 2023-01-30T21:29:48Z Density-dependent habitat selection has implications for fisheries management and for the recovery of depleted fish populations. According to ideal free distribution theory, populations contract into areas of highest habitat suitability as their abundance decreases. This can increase their vulnerability to fishing and predation. We detected density-dependent habitat selection by juvenile Atlantic cod (Gadus morhua) (ages 1 and 2) in the North Sea and compared the observed distribution-abundance relationships with those predicted from a model based on ideal free distribution theory and knowledge of optimal temperatures for growth, where temperature was used as a measure of suitability. As predicted by the model, in years when stock size was low, the catches were largely confined to regions with near-optimal bottom temperatures. Conversely, when population size was high, catches were spread across a larger area including regions with suboptimal temperatures. The spatial extent of optimal habitat appears to have decreased from 1977 to 2002, reflecting a gradual warming of the North Sea. The combined negative effects of increased temperature on recruitment rates and the reduced availability of optimal habitat may have increased the vulnerability of the cod population to fishing mortality. Article in Journal/Newspaper atlantic cod Gadus morhua University of East Anglia: UEA Digital Repository Canadian Journal of Fisheries and Aquatic Sciences 62 9 2001 2009 |
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Open Polar |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
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unknown |
description |
Density-dependent habitat selection has implications for fisheries management and for the recovery of depleted fish populations. According to ideal free distribution theory, populations contract into areas of highest habitat suitability as their abundance decreases. This can increase their vulnerability to fishing and predation. We detected density-dependent habitat selection by juvenile Atlantic cod (Gadus morhua) (ages 1 and 2) in the North Sea and compared the observed distribution-abundance relationships with those predicted from a model based on ideal free distribution theory and knowledge of optimal temperatures for growth, where temperature was used as a measure of suitability. As predicted by the model, in years when stock size was low, the catches were largely confined to regions with near-optimal bottom temperatures. Conversely, when population size was high, catches were spread across a larger area including regions with suboptimal temperatures. The spatial extent of optimal habitat appears to have decreased from 1977 to 2002, reflecting a gradual warming of the North Sea. The combined negative effects of increased temperature on recruitment rates and the reduced availability of optimal habitat may have increased the vulnerability of the cod population to fishing mortality. |
format |
Article in Journal/Newspaper |
author |
Blanchard, Julia L. Mills, Craig Jennings, Simon Fox, Clive J. Rackham, Brian D. Eastwood, Paul D. O'Brien, Carl M. |
spellingShingle |
Blanchard, Julia L. Mills, Craig Jennings, Simon Fox, Clive J. Rackham, Brian D. Eastwood, Paul D. O'Brien, Carl M. Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory |
author_facet |
Blanchard, Julia L. Mills, Craig Jennings, Simon Fox, Clive J. Rackham, Brian D. Eastwood, Paul D. O'Brien, Carl M. |
author_sort |
Blanchard, Julia L. |
title |
Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory |
title_short |
Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory |
title_full |
Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory |
title_fullStr |
Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory |
title_full_unstemmed |
Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory |
title_sort |
distribution–abundance relationships for north sea atlantic cod (gadus morhua): observation versus theory |
publishDate |
2005 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/31539/ https://doi.org/10.1139/f05-109 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
Blanchard, Julia L., Mills, Craig, Jennings, Simon, Fox, Clive J., Rackham, Brian D., Eastwood, Paul D. and O'Brien, Carl M. (2005) Distribution–abundance relationships for North Sea Atlantic cod (Gadus morhua): Observation versus theory. Canadian Journal of Fisheries and Aquatic Sciences, 62 (9). pp. 2001-2009. ISSN 0706-652X doi:10.1139/f05-109 |
op_doi |
https://doi.org/10.1139/f05-109 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
62 |
container_issue |
9 |
container_start_page |
2001 |
op_container_end_page |
2009 |
_version_ |
1766357641983950848 |