Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years
To examine overfishing and climate effects on depleted cod (Gadus morhua) stocks, a surplus production model based on reconstructions of cod catch in Newfoundland was used to describe biomass dynamics from 1505 to 2004. Productivity parameters r (population growth rate) and K (carrying capacity) wer...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2004
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Online Access: | http://dx.doi.org/10.1139/f04-173 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-173 |
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crcansciencepubl:10.1139/f04-173 2024-09-15T17:55:31+00:00 Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years Rose, G A 2004 http://dx.doi.org/10.1139/f04-173 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-173 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 9, page 1553-1557 ISSN 0706-652X 1205-7533 journal-article 2004 crcansciencepubl https://doi.org/10.1139/f04-173 2024-08-08T04:13:40Z To examine overfishing and climate effects on depleted cod (Gadus morhua) stocks, a surplus production model based on reconstructions of cod catch in Newfoundland was used to describe biomass dynamics from 1505 to 2004. Productivity parameters r (population growth rate) and K (carrying capacity) were assigned by fitting model to survey biomass. Assumptions of fishery-only influences inferring constant, random, or depensatory parameters fared poorly (did not mimic history), as did climate influences indexed by tree ring growth. However, a model using both climate and depensation fared well, mimicking much documented history of Newfoundland cod, including declines during the Little Ice Age (mid- to late 19th century) and the stock collapses of the late 20th century, with a good fit to recent scientific surveys (r 2 = 0.80). This model suggests temporal differentiation between fishing and climate effects, including (i) declines during the Little Ice Age (18001880) caused by lower productivity, (ii) collapses in the 1960s caused by overfishing, (iii) collapses in the late 1980s caused by both, and (iv) rebuilding now hindered by depensatory effects of low numbers. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 61 9 1553 1557 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
To examine overfishing and climate effects on depleted cod (Gadus morhua) stocks, a surplus production model based on reconstructions of cod catch in Newfoundland was used to describe biomass dynamics from 1505 to 2004. Productivity parameters r (population growth rate) and K (carrying capacity) were assigned by fitting model to survey biomass. Assumptions of fishery-only influences inferring constant, random, or depensatory parameters fared poorly (did not mimic history), as did climate influences indexed by tree ring growth. However, a model using both climate and depensation fared well, mimicking much documented history of Newfoundland cod, including declines during the Little Ice Age (mid- to late 19th century) and the stock collapses of the late 20th century, with a good fit to recent scientific surveys (r 2 = 0.80). This model suggests temporal differentiation between fishing and climate effects, including (i) declines during the Little Ice Age (18001880) caused by lower productivity, (ii) collapses in the 1960s caused by overfishing, (iii) collapses in the late 1980s caused by both, and (iv) rebuilding now hindered by depensatory effects of low numbers. |
format |
Article in Journal/Newspaper |
author |
Rose, G A |
spellingShingle |
Rose, G A Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years |
author_facet |
Rose, G A |
author_sort |
Rose, G A |
title |
Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years |
title_short |
Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years |
title_full |
Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years |
title_fullStr |
Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years |
title_full_unstemmed |
Reconciling overfishing and climate change with stock dynamics of Atlantic cod ( Gadus morhua) over 500 years |
title_sort |
reconciling overfishing and climate change with stock dynamics of atlantic cod ( gadus morhua) over 500 years |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/f04-173 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-173 |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 9, page 1553-1557 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f04-173 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
61 |
container_issue |
9 |
container_start_page |
1553 |
op_container_end_page |
1557 |
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1810431788741296128 |