Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach
Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food throu...
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ftarchimer:oai:archimer.ifremer.fr:82252 2023-05-15T15:59:32+02:00 Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach Faure, Johanna Peron, Clara Gasco, Nicolas Massiot-granier, Felix Spitz, Jerome Guinet, Christophe Tixier, Paul 2021-06 application/pdf https://archimer.ifremer.fr/doc/00710/82252/87044.pdf https://archimer.ifremer.fr/doc/00710/82252/87045.pdf https://doi.org/10.3354/meps13725 https://archimer.ifremer.fr/doc/00710/82252/ eng eng Inter-research https://archimer.ifremer.fr/doc/00710/82252/87044.pdf https://archimer.ifremer.fr/doc/00710/82252/87045.pdf doi:10.3354/meps13725 https://archimer.ifremer.fr/doc/00710/82252/ info:eu-repo/semantics/openAccess restricted use Marine Ecology Progress Series (0171-8630) (Inter-research), 2021-06 , Vol. 668 , P. 149-161 Marine mammals Depredation Bioenergetic model Fisheries interaction Ecosystem-based management Top predator conservation Dissostichus eleginoides Orcinus orca text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.3354/meps13725 2021-09-23T20:38:07Z Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food through limited foraging effort. However, the extent to which depredated resources from fisheries contribute to the energetic requirements and affect the demography of depredating individuals is unknown. We investigated the contribution of Patagonian toothfish Dissostichus eleginoides depredated on longlines to the energetic requirements of killer whales Orcinus orca around the Crozet Islands (southern Indian Ocean) over the period 2007-2018. Our results indicate that during days when depredation occurred, depredating individuals fulfilled on average 94.1% of their daily energetic requirements with depredated toothfish. However, the contribution varied from 1.2 to 13.3% of the monthly energetic requirements and from 2.4 to 8.8% of the yearly energetic requirements of the total population. Together, these findings suggest that intake of depredated toothfish can be substantial at a fine scale (daily and individually), potentially leading to temporary provisioning effects and changes in predation pressures. These effects become minor (< 10%), however, when considering the full population over a whole year. The contribution of depredated fish to the annual energetic requirements of the population has increased in recent years, likely due to larger fishing quotas and greater opportunities for whales to depredate, which stresses the importance of accounting for depredation in ecosystem-based management of fishing activity. Article in Journal/Newspaper Crozet Islands Orca Orcinus orca Patagonian Toothfish Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Marine Ecology Progress Series 668 149 161 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Marine mammals Depredation Bioenergetic model Fisheries interaction Ecosystem-based management Top predator conservation Dissostichus eleginoides Orcinus orca |
spellingShingle |
Marine mammals Depredation Bioenergetic model Fisheries interaction Ecosystem-based management Top predator conservation Dissostichus eleginoides Orcinus orca Faure, Johanna Peron, Clara Gasco, Nicolas Massiot-granier, Felix Spitz, Jerome Guinet, Christophe Tixier, Paul Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
topic_facet |
Marine mammals Depredation Bioenergetic model Fisheries interaction Ecosystem-based management Top predator conservation Dissostichus eleginoides Orcinus orca |
description |
Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food through limited foraging effort. However, the extent to which depredated resources from fisheries contribute to the energetic requirements and affect the demography of depredating individuals is unknown. We investigated the contribution of Patagonian toothfish Dissostichus eleginoides depredated on longlines to the energetic requirements of killer whales Orcinus orca around the Crozet Islands (southern Indian Ocean) over the period 2007-2018. Our results indicate that during days when depredation occurred, depredating individuals fulfilled on average 94.1% of their daily energetic requirements with depredated toothfish. However, the contribution varied from 1.2 to 13.3% of the monthly energetic requirements and from 2.4 to 8.8% of the yearly energetic requirements of the total population. Together, these findings suggest that intake of depredated toothfish can be substantial at a fine scale (daily and individually), potentially leading to temporary provisioning effects and changes in predation pressures. These effects become minor (< 10%), however, when considering the full population over a whole year. The contribution of depredated fish to the annual energetic requirements of the population has increased in recent years, likely due to larger fishing quotas and greater opportunities for whales to depredate, which stresses the importance of accounting for depredation in ecosystem-based management of fishing activity. |
format |
Article in Journal/Newspaper |
author |
Faure, Johanna Peron, Clara Gasco, Nicolas Massiot-granier, Felix Spitz, Jerome Guinet, Christophe Tixier, Paul |
author_facet |
Faure, Johanna Peron, Clara Gasco, Nicolas Massiot-granier, Felix Spitz, Jerome Guinet, Christophe Tixier, Paul |
author_sort |
Faure, Johanna |
title |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
title_short |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
title_full |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
title_fullStr |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
title_full_unstemmed |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
title_sort |
contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the crozet islands: a multi-scale bioenergetic approach |
publisher |
Inter-research |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00710/82252/87044.pdf https://archimer.ifremer.fr/doc/00710/82252/87045.pdf https://doi.org/10.3354/meps13725 https://archimer.ifremer.fr/doc/00710/82252/ |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Crozet Islands Orca Orcinus orca Patagonian Toothfish |
genre_facet |
Crozet Islands Orca Orcinus orca Patagonian Toothfish |
op_source |
Marine Ecology Progress Series (0171-8630) (Inter-research), 2021-06 , Vol. 668 , P. 149-161 |
op_relation |
https://archimer.ifremer.fr/doc/00710/82252/87044.pdf https://archimer.ifremer.fr/doc/00710/82252/87045.pdf doi:10.3354/meps13725 https://archimer.ifremer.fr/doc/00710/82252/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3354/meps13725 |
container_title |
Marine Ecology Progress Series |
container_volume |
668 |
container_start_page |
149 |
op_container_end_page |
161 |
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1766395475265585152 |