A multispecies age-structured assessment model for the Gulf of Alaska
Predation is the largest source of mortality for marine fish and may be an important process in regulating population size. Recent population models have attempted to quantify predation separately from other sources of natural mortality. Building upon such work, a multispecies age-structured assessm...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1896 2023-10-09T21:56:16+02:00 A multispecies age-structured assessment model for the Gulf of Alaska van Kirk, Kray F. Quinn, Terrance J. Collie, Jeremy S. 2010-08-06T07:00:00Z https://digitalcommons.uri.edu/gsofacpubs/927 https://doi.org/10.1139/F10-053 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/927 doi:10.1139/F10-053 https://doi.org/10.1139/F10-053 Graduate School of Oceanography Faculty Publications text 2010 ftunivrhodeislan https://doi.org/10.1139/F10-053 2023-09-11T18:07:44Z Predation is the largest source of mortality for marine fish and may be an important process in regulating population size. Recent population models have attempted to quantify predation separately from other sources of natural mortality. Building upon such work, a multispecies age-structured assessment model (MSASA) for the Gulf of Alaska was developed, which included arrowtooth flounder (Atheresthes stomias), Pacific cod (Gadus macrocephalus), and walleye pollock (Theragra chalcogramma). Predation mortality was a flexible function of predator and prey abundances that was fitted to stomach-content data. A proof of concept illustration is presented here, assessing model outputs against a set of single-species models. The MSASA model was able to successfully estimate predation between species and integrate it into total mortality. Significant predation occurred on younger pollock and flounder. Results indicate a significant change in predation over time on pollock as a function of increased arrowtooth flounder abundance. Estimating mortality and other parameters for three species simultaneously is complex, and the advantage of greater biological realism of MSASA comes at the expense of greater uncertainty in parameter estimation. Text Theragra chalcogramma Alaska University of Rhode Island: DigitalCommons@URI Gulf of Alaska Pacific Natural Resource Modeling 28 2 184 205 |
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Open Polar |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
Predation is the largest source of mortality for marine fish and may be an important process in regulating population size. Recent population models have attempted to quantify predation separately from other sources of natural mortality. Building upon such work, a multispecies age-structured assessment model (MSASA) for the Gulf of Alaska was developed, which included arrowtooth flounder (Atheresthes stomias), Pacific cod (Gadus macrocephalus), and walleye pollock (Theragra chalcogramma). Predation mortality was a flexible function of predator and prey abundances that was fitted to stomach-content data. A proof of concept illustration is presented here, assessing model outputs against a set of single-species models. The MSASA model was able to successfully estimate predation between species and integrate it into total mortality. Significant predation occurred on younger pollock and flounder. Results indicate a significant change in predation over time on pollock as a function of increased arrowtooth flounder abundance. Estimating mortality and other parameters for three species simultaneously is complex, and the advantage of greater biological realism of MSASA comes at the expense of greater uncertainty in parameter estimation. |
format |
Text |
author |
van Kirk, Kray F. Quinn, Terrance J. Collie, Jeremy S. |
spellingShingle |
van Kirk, Kray F. Quinn, Terrance J. Collie, Jeremy S. A multispecies age-structured assessment model for the Gulf of Alaska |
author_facet |
van Kirk, Kray F. Quinn, Terrance J. Collie, Jeremy S. |
author_sort |
van Kirk, Kray F. |
title |
A multispecies age-structured assessment model for the Gulf of Alaska |
title_short |
A multispecies age-structured assessment model for the Gulf of Alaska |
title_full |
A multispecies age-structured assessment model for the Gulf of Alaska |
title_fullStr |
A multispecies age-structured assessment model for the Gulf of Alaska |
title_full_unstemmed |
A multispecies age-structured assessment model for the Gulf of Alaska |
title_sort |
multispecies age-structured assessment model for the gulf of alaska |
publisher |
DigitalCommons@URI |
publishDate |
2010 |
url |
https://digitalcommons.uri.edu/gsofacpubs/927 https://doi.org/10.1139/F10-053 |
geographic |
Gulf of Alaska Pacific |
geographic_facet |
Gulf of Alaska Pacific |
genre |
Theragra chalcogramma Alaska |
genre_facet |
Theragra chalcogramma Alaska |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/927 doi:10.1139/F10-053 https://doi.org/10.1139/F10-053 |
op_doi |
https://doi.org/10.1139/F10-053 |
container_title |
Natural Resource Modeling |
container_volume |
28 |
container_issue |
2 |
container_start_page |
184 |
op_container_end_page |
205 |
_version_ |
1779320868658216960 |