Did population collapse influence individual fecundity of Northwest Atlantic cod?
We examined the influence of population collapse on individual potential fecundity and total population egg production (TEP) of three northwest Atlantic cod (Gadus morhua) populations: northern cod (Divisions 2J3KL), southern Grand Bank cod (NAFO Divisions 3NO), and southern Newfoundland cod (Subdiv...
Published in: | ICES Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Oxford University Press
2007
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Online Access: | https://research.library.mun.ca/2024/ https://research.library.mun.ca/2024/1/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://research.library.mun.ca/2024/3/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://doi.org/10.1093/icesjms/fsm127 |
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ftmemorialuniv:oai:research.library.mun.ca:2024 2023-10-01T03:54:31+02:00 Did population collapse influence individual fecundity of Northwest Atlantic cod? Rideout, Rick M. Stares, J. C. Morgan, M. J. Brattey, John 2007 application/pdf https://research.library.mun.ca/2024/ https://research.library.mun.ca/2024/1/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://research.library.mun.ca/2024/3/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://doi.org/10.1093/icesjms/fsm127 en eng Oxford University Press https://research.library.mun.ca/2024/1/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://research.library.mun.ca/2024/3/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf Rideout, Rick M. <https://research.library.mun.ca/view/creator_az/Rideout=3ARick_M=2E=3A=3A.html> and Stares, J. C. <https://research.library.mun.ca/view/creator_az/Stares=3AJ=2E_C=2E=3A=3A.html> and Morgan, M. J. <https://research.library.mun.ca/view/creator_az/Morgan=3AM=2E_J=2E=3A=3A.html> and Brattey, John <https://research.library.mun.ca/view/creator_az/Brattey=3AJohn=3A=3A.html> (2007) Did population collapse influence individual fecundity of Northwest Atlantic cod? ICES Journal of Marine Science , 64 (7). pp. 1338-1347. ISSN 1095-9289 cc_by_nc Article PeerReviewed 2007 ftmemorialuniv https://doi.org/10.1093/icesjms/fsm127 2023-09-03T06:44:41Z We examined the influence of population collapse on individual potential fecundity and total population egg production (TEP) of three northwest Atlantic cod (Gadus morhua) populations: northern cod (Divisions 2J3KL), southern Grand Bank cod (NAFO Divisions 3NO), and southern Newfoundland cod (Subdivision 3Ps). Fecundity at length increased in conjunction with population collapse for two (3NO, 3Ps) of the three populations. Subsequent moderate population recovery between the 1990s and 2000s in 3Ps was accompanied by a decrease in fecundity at length. A large decrease in fecundity at length for 3NO during the same time period, despite little or no population recovery, coupled with the fact that there was no obvious difference in fish condition between the two time periods, suggested that density-independent factors could be contributing to the changes in fecundity. Use of pre-collapse fecundity–length relationships to estimate TEP in the post-collapse period resulted in underestimation of TEP by as much as 30% in 3NO and 46% in 3Ps, whereas in 2J3KL, TEP was overestimated by as much as 18%. Although the results do not fully support the hypothesis of an inverse relationship between population size and fecundity, they do demonstrate the variable nature of cod fecundity which, if not accounted for, can lead to erroneous perceptions of stock reproductive potential. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Northwest Atlantic Memorial University of Newfoundland: Research Repository ICES Journal of Marine Science 64 7 1338 1347 |
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Open Polar |
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Memorial University of Newfoundland: Research Repository |
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ftmemorialuniv |
language |
English |
description |
We examined the influence of population collapse on individual potential fecundity and total population egg production (TEP) of three northwest Atlantic cod (Gadus morhua) populations: northern cod (Divisions 2J3KL), southern Grand Bank cod (NAFO Divisions 3NO), and southern Newfoundland cod (Subdivision 3Ps). Fecundity at length increased in conjunction with population collapse for two (3NO, 3Ps) of the three populations. Subsequent moderate population recovery between the 1990s and 2000s in 3Ps was accompanied by a decrease in fecundity at length. A large decrease in fecundity at length for 3NO during the same time period, despite little or no population recovery, coupled with the fact that there was no obvious difference in fish condition between the two time periods, suggested that density-independent factors could be contributing to the changes in fecundity. Use of pre-collapse fecundity–length relationships to estimate TEP in the post-collapse period resulted in underestimation of TEP by as much as 30% in 3NO and 46% in 3Ps, whereas in 2J3KL, TEP was overestimated by as much as 18%. Although the results do not fully support the hypothesis of an inverse relationship between population size and fecundity, they do demonstrate the variable nature of cod fecundity which, if not accounted for, can lead to erroneous perceptions of stock reproductive potential. |
format |
Article in Journal/Newspaper |
author |
Rideout, Rick M. Stares, J. C. Morgan, M. J. Brattey, John |
spellingShingle |
Rideout, Rick M. Stares, J. C. Morgan, M. J. Brattey, John Did population collapse influence individual fecundity of Northwest Atlantic cod? |
author_facet |
Rideout, Rick M. Stares, J. C. Morgan, M. J. Brattey, John |
author_sort |
Rideout, Rick M. |
title |
Did population collapse influence individual fecundity of Northwest Atlantic cod? |
title_short |
Did population collapse influence individual fecundity of Northwest Atlantic cod? |
title_full |
Did population collapse influence individual fecundity of Northwest Atlantic cod? |
title_fullStr |
Did population collapse influence individual fecundity of Northwest Atlantic cod? |
title_full_unstemmed |
Did population collapse influence individual fecundity of Northwest Atlantic cod? |
title_sort |
did population collapse influence individual fecundity of northwest atlantic cod? |
publisher |
Oxford University Press |
publishDate |
2007 |
url |
https://research.library.mun.ca/2024/ https://research.library.mun.ca/2024/1/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://research.library.mun.ca/2024/3/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://doi.org/10.1093/icesjms/fsm127 |
genre |
atlantic cod Gadus morhua Newfoundland Northwest Atlantic |
genre_facet |
atlantic cod Gadus morhua Newfoundland Northwest Atlantic |
op_relation |
https://research.library.mun.ca/2024/1/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf https://research.library.mun.ca/2024/3/Did_population_collapse_influence_individual_fecundity_of_Northwest_Atlantic_cod.pdf Rideout, Rick M. <https://research.library.mun.ca/view/creator_az/Rideout=3ARick_M=2E=3A=3A.html> and Stares, J. C. <https://research.library.mun.ca/view/creator_az/Stares=3AJ=2E_C=2E=3A=3A.html> and Morgan, M. J. <https://research.library.mun.ca/view/creator_az/Morgan=3AM=2E_J=2E=3A=3A.html> and Brattey, John <https://research.library.mun.ca/view/creator_az/Brattey=3AJohn=3A=3A.html> (2007) Did population collapse influence individual fecundity of Northwest Atlantic cod? ICES Journal of Marine Science , 64 (7). pp. 1338-1347. ISSN 1095-9289 |
op_rights |
cc_by_nc |
op_doi |
https://doi.org/10.1093/icesjms/fsm127 |
container_title |
ICES Journal of Marine Science |
container_volume |
64 |
container_issue |
7 |
container_start_page |
1338 |
op_container_end_page |
1347 |
_version_ |
1778522275341926400 |