Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions
International audience Fisheries may generate new feeding opportunities for marine predators, which switch foraging behaviour to depredation when they feed on fish directly from fishing gear. However, the role of diet in the propensity of individuals to depredate and whether the depredated resource...
Published in: | Marine Ecology Progress Series |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.archives-ouvertes.fr/hal-02098173 https://doi.org/10.3354/meps12894 |
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ftccsdartic:oai:HAL:hal-02098173v1 2023-05-15T15:37:13+02:00 Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions Tixier, Paul Giménez, Joan Reisinger, R R Mèndez-Fernandez, Paula Arnould, John P. Y. Cherel, Y. Guinet, C. School of Life and Environmental Sciences (Burwood Campus) Australia Deakin University Burwood Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Institute of Marine Sciences / Institut de Ciències del Mar Barcelona (ICM) Consejo Superior de Investigaciones Científicas Madrid (CSIC) CESAB-FRB France Observatoire PELAGIS UMS 3462 (PELAGIS) LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) 2019-03-21 https://hal.archives-ouvertes.fr/hal-02098173 https://doi.org/10.3354/meps12894 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12894 hal-02098173 https://hal.archives-ouvertes.fr/hal-02098173 doi:10.3354/meps12894 ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.archives-ouvertes.fr/hal-02098173 Marine Ecology Progress Series, Inter Research, 2019, 613, pp.197-210. ⟨10.3354/meps12894⟩ Fishery interactions Stable isotopes Diet Fisheries Southern Ocean Killer whale [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.3354/meps12894 2021-11-28T00:42:30Z International audience Fisheries may generate new feeding opportunities for marine predators, which switch foraging behaviour to depredation when they feed on fish directly from fishing gear. However, the role of diet in the propensity of individuals to depredate and whether the depredated resource is artificial or part of the natural diet of individuals is often unclear. Using stable isotopes, this study investigated the importance of the commercially exploited Patagonian toothfish Dissostichus eleginoides in the diet of generalist subantarctic killer whales Orcinus orca depredating this fish at Crozet (45°S, 50°E). The isotopic niche of these killer whales was large and overlapped with that of sperm whales Physeter macrocephalus from the same region, which feed on toothfish both naturally and through depredation. There was no isotopic difference between killer whales that depredated toothfish and those that did not. Isotopic mixing models indicated that prey groups including large/medium sized toothfish and elephant seal Mirounga leonina pups represented ~60% of the diet relative to prey groups including penguins, baleen whales and coastal fish. These results indicate that toothfish are an important natural prey item of Crozet killer whales and that switching to depredation primarily occurs when fisheries facilitate access to that resource. This study suggests that toothfish, as a commercial species, may also have a key role as prey for top predators in subantarctic ecosystems. Therefore, assessing the extent to which predators use that resource naturally or from fisheries is now needed to improve both fish stock management and species conservation strategies. Article in Journal/Newspaper baleen whales Elephant Seal Killer Whale Mirounga leonina Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus Southern Ocean Killer whale Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Marine Ecology Progress Series 613 197 210 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Fishery interactions Stable isotopes Diet Fisheries Southern Ocean Killer whale [SDE]Environmental Sciences |
spellingShingle |
Fishery interactions Stable isotopes Diet Fisheries Southern Ocean Killer whale [SDE]Environmental Sciences Tixier, Paul Giménez, Joan Reisinger, R R Mèndez-Fernandez, Paula Arnould, John P. Y. Cherel, Y. Guinet, C. Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
topic_facet |
Fishery interactions Stable isotopes Diet Fisheries Southern Ocean Killer whale [SDE]Environmental Sciences |
description |
International audience Fisheries may generate new feeding opportunities for marine predators, which switch foraging behaviour to depredation when they feed on fish directly from fishing gear. However, the role of diet in the propensity of individuals to depredate and whether the depredated resource is artificial or part of the natural diet of individuals is often unclear. Using stable isotopes, this study investigated the importance of the commercially exploited Patagonian toothfish Dissostichus eleginoides in the diet of generalist subantarctic killer whales Orcinus orca depredating this fish at Crozet (45°S, 50°E). The isotopic niche of these killer whales was large and overlapped with that of sperm whales Physeter macrocephalus from the same region, which feed on toothfish both naturally and through depredation. There was no isotopic difference between killer whales that depredated toothfish and those that did not. Isotopic mixing models indicated that prey groups including large/medium sized toothfish and elephant seal Mirounga leonina pups represented ~60% of the diet relative to prey groups including penguins, baleen whales and coastal fish. These results indicate that toothfish are an important natural prey item of Crozet killer whales and that switching to depredation primarily occurs when fisheries facilitate access to that resource. This study suggests that toothfish, as a commercial species, may also have a key role as prey for top predators in subantarctic ecosystems. Therefore, assessing the extent to which predators use that resource naturally or from fisheries is now needed to improve both fish stock management and species conservation strategies. |
author2 |
School of Life and Environmental Sciences (Burwood Campus) Australia Deakin University Burwood Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Institute of Marine Sciences / Institut de Ciències del Mar Barcelona (ICM) Consejo Superior de Investigaciones Científicas Madrid (CSIC) CESAB-FRB France Observatoire PELAGIS UMS 3462 (PELAGIS) LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs) Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tixier, Paul Giménez, Joan Reisinger, R R Mèndez-Fernandez, Paula Arnould, John P. Y. Cherel, Y. Guinet, C. |
author_facet |
Tixier, Paul Giménez, Joan Reisinger, R R Mèndez-Fernandez, Paula Arnould, John P. Y. Cherel, Y. Guinet, C. |
author_sort |
Tixier, Paul |
title |
Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
title_short |
Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
title_full |
Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
title_fullStr |
Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
title_full_unstemmed |
Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
title_sort |
importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02098173 https://doi.org/10.3354/meps12894 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
baleen whales Elephant Seal Killer Whale Mirounga leonina Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus Southern Ocean Killer whale |
genre_facet |
baleen whales Elephant Seal Killer Whale Mirounga leonina Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus Southern Ocean Killer whale |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.archives-ouvertes.fr/hal-02098173 Marine Ecology Progress Series, Inter Research, 2019, 613, pp.197-210. ⟨10.3354/meps12894⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12894 hal-02098173 https://hal.archives-ouvertes.fr/hal-02098173 doi:10.3354/meps12894 |
op_doi |
https://doi.org/10.3354/meps12894 |
container_title |
Marine Ecology Progress Series |
container_volume |
613 |
container_start_page |
197 |
op_container_end_page |
210 |
_version_ |
1766367673594150912 |