The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod
Abstract Discriminating among sympatric sub-populations is critical not only for the investigation of fish population structure, but also for effective fishery management. The Gulf of Maine stock of Atlantic cod contains two genetically distinct sub-populations whose spawning grounds overlap in spac...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsz083 http://academic.oup.com/icesjms/article-pdf/76/6/1626/31247136/fsz083.pdf |
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croxfordunivpr:10.1093/icesjms/fsz083 2024-09-15T17:55:26+00:00 The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod Dean, Micah J Elzey, Scott P Hoffman, William S Buchan, Nicholas C Grabowski, Jonathan H Kuparinen, Anna 2019 http://dx.doi.org/10.1093/icesjms/fsz083 http://academic.oup.com/icesjms/article-pdf/76/6/1626/31247136/fsz083.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 76, issue 6, page 1626-1640 ISSN 1054-3139 1095-9289 journal-article 2019 croxfordunivpr https://doi.org/10.1093/icesjms/fsz083 2024-08-12T04:23:19Z Abstract Discriminating among sympatric sub-populations is critical not only for the investigation of fish population structure, but also for effective fishery management. The Gulf of Maine stock of Atlantic cod contains two genetically distinct sub-populations whose spawning grounds overlap in space, but not season. Lack of a practical tool for discriminating between these spring and winter spawners has thus far prevented addressing metapopulation structure in stock assessments and fishery management plans. To address this issue, we developed a simple approach to discriminate between the sympatric sub-populations that relies on internal otolith structures. Using a logistic regression model fit to training data (n = 577) and evaluated through cross-validation, we correctly classified individuals with 81% accuracy and predicted the overall sub-population mixture within 1%. Applying the model to a broader population dataset (n = 1642) revealed that spring-spawned cod are more concentrated within closed fishing areas and therefore experience a lower mortality rate. However, despite dominating older age classes and comprising a large fraction of the spawning stock, these spring cod contribute little to recruitment. This apparent sub-population difference in the stockârecruitment relationship has important consequences for assessment models and the success of management measures designed to rebuild the stock. Article in Journal/Newspaper atlantic cod Oxford University Press ICES Journal of Marine Science 76 6 1626 1640 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Discriminating among sympatric sub-populations is critical not only for the investigation of fish population structure, but also for effective fishery management. The Gulf of Maine stock of Atlantic cod contains two genetically distinct sub-populations whose spawning grounds overlap in space, but not season. Lack of a practical tool for discriminating between these spring and winter spawners has thus far prevented addressing metapopulation structure in stock assessments and fishery management plans. To address this issue, we developed a simple approach to discriminate between the sympatric sub-populations that relies on internal otolith structures. Using a logistic regression model fit to training data (n = 577) and evaluated through cross-validation, we correctly classified individuals with 81% accuracy and predicted the overall sub-population mixture within 1%. Applying the model to a broader population dataset (n = 1642) revealed that spring-spawned cod are more concentrated within closed fishing areas and therefore experience a lower mortality rate. However, despite dominating older age classes and comprising a large fraction of the spawning stock, these spring cod contribute little to recruitment. This apparent sub-population difference in the stockârecruitment relationship has important consequences for assessment models and the success of management measures designed to rebuild the stock. |
author2 |
Kuparinen, Anna |
format |
Article in Journal/Newspaper |
author |
Dean, Micah J Elzey, Scott P Hoffman, William S Buchan, Nicholas C Grabowski, Jonathan H |
spellingShingle |
Dean, Micah J Elzey, Scott P Hoffman, William S Buchan, Nicholas C Grabowski, Jonathan H The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod |
author_facet |
Dean, Micah J Elzey, Scott P Hoffman, William S Buchan, Nicholas C Grabowski, Jonathan H |
author_sort |
Dean, Micah J |
title |
The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod |
title_short |
The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod |
title_full |
The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod |
title_fullStr |
The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod |
title_full_unstemmed |
The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod |
title_sort |
relative importance of sub-populations to the gulf of maine stock of atlantic cod |
publisher |
Oxford University Press (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/icesjms/fsz083 http://academic.oup.com/icesjms/article-pdf/76/6/1626/31247136/fsz083.pdf |
genre |
atlantic cod |
genre_facet |
atlantic cod |
op_source |
ICES Journal of Marine Science volume 76, issue 6, page 1626-1640 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsz083 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
6 |
container_start_page |
1626 |
op_container_end_page |
1640 |
_version_ |
1810431723576492032 |