Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach
International audience 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 wa...
Published in: | Marine Ecology Progress Series |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.science/hal-03210895 https://hal.science/hal-03210895/document https://hal.science/hal-03210895/file/FMEPS668_2021.pdf https://doi.org/10.3354/meps13725 |
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ftunivantilles:oai:HAL:hal-03210895v1 |
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Open Polar |
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Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Faure, Johanna Péron, Clara Gasco, Nicolas Massiot-Granier, Félix Spitz, Jérôme 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 |
[SDE]Environmental Sciences |
description |
International audience 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 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 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 yet 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. |
author2 |
Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Département Milieux et Peuplements Aquatiques Muséum national d'Histoire naturelle (MNHN) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) MARine Biodiversity Exploitation and Conservation - MARBEC (UMR MARBEC ) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) ANR-17-CE32-0007,OrcaDepred,OrcaDepred - Evaluation des conséquences écologiques et socio-économiques de la déprédation exercée par les cétacés sur les pêcheries à la palangre : Mise en œuvre d'une approche technico-économique en vue de sa suppression(2017) |
format |
Article in Journal/Newspaper |
author |
Faure, Johanna Péron, Clara Gasco, Nicolas Massiot-Granier, Félix Spitz, Jérôme Guinet, Christophe Tixier, Paul |
author_facet |
Faure, Johanna Péron, Clara Gasco, Nicolas Massiot-Granier, Félix Spitz, Jérôme 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 |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03210895 https://hal.science/hal-03210895/document https://hal.science/hal-03210895/file/FMEPS668_2021.pdf https://doi.org/10.3354/meps13725 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Crozet Islands Orca Orcinus orca Patagonian Toothfish |
genre_facet |
Crozet Islands Orca Orcinus orca Patagonian Toothfish |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-03210895 Marine Ecology Progress Series, 2021, 668, pp.149-161. ⟨10.3354/meps13725⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps13725 hal-03210895 https://hal.science/hal-03210895 https://hal.science/hal-03210895/document https://hal.science/hal-03210895/file/FMEPS668_2021.pdf doi:10.3354/meps13725 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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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1796308447361236992 |
spelling |
ftunivantilles:oai:HAL:hal-03210895v1 2024-04-14T08:10:47+00:00 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 Péron, Clara Gasco, Nicolas Massiot-Granier, Félix Spitz, Jérôme Guinet, Christophe Tixier, Paul Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Département Milieux et Peuplements Aquatiques Muséum national d'Histoire naturelle (MNHN) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) MARine Biodiversity Exploitation and Conservation - MARBEC (UMR MARBEC ) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) ANR-17-CE32-0007,OrcaDepred,OrcaDepred - Evaluation des conséquences écologiques et socio-économiques de la déprédation exercée par les cétacés sur les pêcheries à la palangre : Mise en œuvre d'une approche technico-économique en vue de sa suppression(2017) 2021 https://hal.science/hal-03210895 https://hal.science/hal-03210895/document https://hal.science/hal-03210895/file/FMEPS668_2021.pdf https://doi.org/10.3354/meps13725 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps13725 hal-03210895 https://hal.science/hal-03210895 https://hal.science/hal-03210895/document https://hal.science/hal-03210895/file/FMEPS668_2021.pdf doi:10.3354/meps13725 info:eu-repo/semantics/OpenAccess ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-03210895 Marine Ecology Progress Series, 2021, 668, pp.149-161. ⟨10.3354/meps13725⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivantilles https://doi.org/10.3354/meps13725 2024-03-21T17:53:07Z International audience 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 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 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 yet 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 Université des Antilles (UAG): HAL Indian Marine Ecology Progress Series 668 149 161 |