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.science/hal-02098173 https://hal.science/hal-02098173/document https://hal.science/hal-02098173/file/m613p197.pdf https://doi.org/10.3354/meps12894 |
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ftinsu: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) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) 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 - UMR 7266 (LIENSs) Institut national des sciences de l'Univers (INSU - CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2019-03-21 https://hal.science/hal-02098173 https://hal.science/hal-02098173/document https://hal.science/hal-02098173/file/m613p197.pdf 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.science/hal-02098173 https://hal.science/hal-02098173/document https://hal.science/hal-02098173/file/m613p197.pdf doi:10.3354/meps12894 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-02098173 Marine Ecology Progress Series, 2019, 613, pp.197-210. ⟨10.3354/meps12894⟩ Diet Fisheries Southern Ocean Killer whale Stable isotopes Fishery interactions [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.3354/meps12894 2023-02-15T17:53:21Z 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 Institut national des sciences de l'Univers: HAL-INSU Southern Ocean Marine Ecology Progress Series 613 197 210 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Diet Fisheries Southern Ocean Killer whale Stable isotopes Fishery interactions [SDE]Environmental Sciences |
spellingShingle |
Diet Fisheries Southern Ocean Killer whale Stable isotopes Fishery interactions [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 |
Diet Fisheries Southern Ocean Killer whale Stable isotopes Fishery interactions [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) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) 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 - UMR 7266 (LIENSs) Institut national des sciences de l'Univers (INSU - CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-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.science/hal-02098173 https://hal.science/hal-02098173/document https://hal.science/hal-02098173/file/m613p197.pdf 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.science/hal-02098173 Marine Ecology Progress Series, 2019, 613, pp.197-210. ⟨10.3354/meps12894⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12894 hal-02098173 https://hal.science/hal-02098173 https://hal.science/hal-02098173/document https://hal.science/hal-02098173/file/m613p197.pdf doi:10.3354/meps12894 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
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_ |
1766367685502828544 |