Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate
A stochastic, age-structured life history model was used to examine how age at maturity (theta), pre- (Z imm ) and postreproductive (Z mat ) mortality, and postreproductive growth rate can affect maximum reproductive rates of fish at low population size. Simulations suggest that annual (r) and per-g...
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Online Access: | http://dx.doi.org/10.1139/f99-088 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-088 |
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crcansciencepubl:10.1139/f99-088 2023-12-17T10:26:59+01:00 Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate Hutchings, Jeffrey A 1999 http://dx.doi.org/10.1139/f99-088 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-088 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 9, page 1612-1623 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1999 crcansciencepubl https://doi.org/10.1139/f99-088 2023-11-19T13:39:30Z A stochastic, age-structured life history model was used to examine how age at maturity (theta), pre- (Z imm ) and postreproductive (Z mat ) mortality, and postreproductive growth rate can affect maximum reproductive rates of fish at low population size. Simulations suggest that annual (r) and per-generation (R 0 ) metrics of population growth for Newfoundland's northern Grand Bank Atlantic cod, Gadus morhua, are primarily influenced by changes to mortality prior to and following reproduction. At observed weights at age and Z mat = 0.2, r ranged between 0.135 and 0.164 for cod maturing at between 4 and 7 years. Incremental increases in either Z imm or Z mat of 0.1 were associated with 0.03-0.05 reductions in r. To effect similar reductions, individual growth rate would have to decline by approximately one half. At observed weights at age, increases in Z mat from 0.20 to 0.45 increased the probability of negative per-generation growth from 3 to 26% for cod maturing at 4 years and from 6 to 46% for cod maturing at 7 years. Thus, even in the absence of fishing mortality, little or no population growth by Atlantic cod may not be unexpected in the presence of environmental stochasticity, particularly when accompanied by increases in mortality and declining individual growth. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 56 9 1612 1623 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Hutchings, Jeffrey A Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
A stochastic, age-structured life history model was used to examine how age at maturity (theta), pre- (Z imm ) and postreproductive (Z mat ) mortality, and postreproductive growth rate can affect maximum reproductive rates of fish at low population size. Simulations suggest that annual (r) and per-generation (R 0 ) metrics of population growth for Newfoundland's northern Grand Bank Atlantic cod, Gadus morhua, are primarily influenced by changes to mortality prior to and following reproduction. At observed weights at age and Z mat = 0.2, r ranged between 0.135 and 0.164 for cod maturing at between 4 and 7 years. Incremental increases in either Z imm or Z mat of 0.1 were associated with 0.03-0.05 reductions in r. To effect similar reductions, individual growth rate would have to decline by approximately one half. At observed weights at age, increases in Z mat from 0.20 to 0.45 increased the probability of negative per-generation growth from 3 to 26% for cod maturing at 4 years and from 6 to 46% for cod maturing at 7 years. Thus, even in the absence of fishing mortality, little or no population growth by Atlantic cod may not be unexpected in the presence of environmental stochasticity, particularly when accompanied by increases in mortality and declining individual growth. |
format |
Article in Journal/Newspaper |
author |
Hutchings, Jeffrey A |
author_facet |
Hutchings, Jeffrey A |
author_sort |
Hutchings, Jeffrey A |
title |
Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate |
title_short |
Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate |
title_full |
Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate |
title_fullStr |
Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate |
title_full_unstemmed |
Influence of growth and survival costs of reproduction on Atlantic cod, Gadus morhua , population growth rate |
title_sort |
influence of growth and survival costs of reproduction on atlantic cod, gadus morhua , population growth rate |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/f99-088 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-088 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 9, page 1612-1623 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f99-088 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
56 |
container_issue |
9 |
container_start_page |
1612 |
op_container_end_page |
1623 |
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1785578743099555840 |