Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks
Accurately characterizing the biology of a pelagic shark species is critical when assessing its status and resilience to fishing pressure. Natural mortality (M) is well known to be a key parameter determining productivity and resilience, but also one for which estimates are most uncertain. While M c...
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Online Access: | https://doi.org/10.3389/fmars.2021.619190 https://archimer.ifremer.fr/doc/00688/80020/83005.pdf https://archimer.ifremer.fr/doc/00688/80020/83007.pdf https://archimer.ifremer.fr/doc/00688/80020/83006.xlsx |
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fttriple:oai:gotriple.eu:10670/1.wbr4n1 2023-05-15T17:06:30+02:00 Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks Bowlby, Heather D. Benoît, Hugues P. Joyce, Warren Sulikowski, James Coelho, Rui Domingo, Andrés Cortés, Enric Hazin, Fabio Macias, David Biais, Gerard Santos, Catarina Anderson, Brooke https://doi.org/10.3389/fmars.2021.619190 https://archimer.ifremer.fr/doc/00688/80020/83005.pdf https://archimer.ifremer.fr/doc/00688/80020/83007.pdf https://archimer.ifremer.fr/doc/00688/80020/83006.xlsx en eng Frontiers Media SA doi:10.3389/fmars.2021.619190 10670/1.wbr4n1 https://archimer.ifremer.fr/doc/00688/80020/83005.pdf https://archimer.ifremer.fr/doc/00688/80020/83007.pdf https://archimer.ifremer.fr/doc/00688/80020/83006.xlsx other Archimer, archive institutionnelle de l'Ifremer Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2021-04 , Vol. 8 , P. 619190 (14p.) envir demo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.3389/fmars.2021.619190 2023-01-22T18:51:52Z Accurately characterizing the biology of a pelagic shark species is critical when assessing its status and resilience to fishing pressure. Natural mortality (M) is well known to be a key parameter determining productivity and resilience, but also one for which estimates are most uncertain. While M can be inferred from life history, validated direct estimates are extremely rare for sharks. Porbeagle (Lamna nasus) and shortfin mako (Isurus oxyrinchus) are presently overfished in the North Atlantic, but there are no directed fisheries and successful live release of bycatch is believed to have increased. Understanding M, post-release mortality (PRM), and variables that affect mortality are necessary for management and effective bycatch mitigation. From 177 deployments of archival satellite tags, we inferred mortality events, characterized physiological recovery periods following release, and applied survival mixture models to assess M and PRM. We also evaluated covariate effects on the duration of any recovery period and PRM to inform mitigation. Although large sample sizes involving extended monitoring periods (>90 days) would be optimal to directly estimate M from survival data, it was possible to constrain estimates and infer probable values for both species. Furthermore, the consistency of M estimates with values derived from longevity information suggests that age determination is relatively accurate for these species. Regarding bycatch mitigation, our analyses suggest that juvenile porbeagle are more susceptible to harm during capture and handling, that keeping lamnid sharks in the water during release is optimal, and that circle hooks are associated with longer recovery periods for shortfin mako. Text Lamna nasus North Atlantic Porbeagle Unknown Frontiers in Marine Science 8 |
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envir demo |
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envir demo Bowlby, Heather D. Benoît, Hugues P. Joyce, Warren Sulikowski, James Coelho, Rui Domingo, Andrés Cortés, Enric Hazin, Fabio Macias, David Biais, Gerard Santos, Catarina Anderson, Brooke Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks |
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envir demo |
description |
Accurately characterizing the biology of a pelagic shark species is critical when assessing its status and resilience to fishing pressure. Natural mortality (M) is well known to be a key parameter determining productivity and resilience, but also one for which estimates are most uncertain. While M can be inferred from life history, validated direct estimates are extremely rare for sharks. Porbeagle (Lamna nasus) and shortfin mako (Isurus oxyrinchus) are presently overfished in the North Atlantic, but there are no directed fisheries and successful live release of bycatch is believed to have increased. Understanding M, post-release mortality (PRM), and variables that affect mortality are necessary for management and effective bycatch mitigation. From 177 deployments of archival satellite tags, we inferred mortality events, characterized physiological recovery periods following release, and applied survival mixture models to assess M and PRM. We also evaluated covariate effects on the duration of any recovery period and PRM to inform mitigation. Although large sample sizes involving extended monitoring periods (>90 days) would be optimal to directly estimate M from survival data, it was possible to constrain estimates and infer probable values for both species. Furthermore, the consistency of M estimates with values derived from longevity information suggests that age determination is relatively accurate for these species. Regarding bycatch mitigation, our analyses suggest that juvenile porbeagle are more susceptible to harm during capture and handling, that keeping lamnid sharks in the water during release is optimal, and that circle hooks are associated with longer recovery periods for shortfin mako. |
format |
Text |
author |
Bowlby, Heather D. Benoît, Hugues P. Joyce, Warren Sulikowski, James Coelho, Rui Domingo, Andrés Cortés, Enric Hazin, Fabio Macias, David Biais, Gerard Santos, Catarina Anderson, Brooke |
author_facet |
Bowlby, Heather D. Benoît, Hugues P. Joyce, Warren Sulikowski, James Coelho, Rui Domingo, Andrés Cortés, Enric Hazin, Fabio Macias, David Biais, Gerard Santos, Catarina Anderson, Brooke |
author_sort |
Bowlby, Heather D. |
title |
Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks |
title_short |
Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks |
title_full |
Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks |
title_fullStr |
Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks |
title_full_unstemmed |
Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks |
title_sort |
beyond post-release mortality: inferences on recovery periods and natural mortality from electronic tagging data for discarded lamnid sharks |
publisher |
Frontiers Media SA |
url |
https://doi.org/10.3389/fmars.2021.619190 https://archimer.ifremer.fr/doc/00688/80020/83005.pdf https://archimer.ifremer.fr/doc/00688/80020/83007.pdf https://archimer.ifremer.fr/doc/00688/80020/83006.xlsx |
genre |
Lamna nasus North Atlantic Porbeagle |
genre_facet |
Lamna nasus North Atlantic Porbeagle |
op_source |
Archimer, archive institutionnelle de l'Ifremer Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2021-04 , Vol. 8 , P. 619190 (14p.) |
op_relation |
doi:10.3389/fmars.2021.619190 10670/1.wbr4n1 https://archimer.ifremer.fr/doc/00688/80020/83005.pdf https://archimer.ifremer.fr/doc/00688/80020/83007.pdf https://archimer.ifremer.fr/doc/00688/80020/83006.xlsx |
op_rights |
other |
op_doi |
https://doi.org/10.3389/fmars.2021.619190 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
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1766061650627002368 |