Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/184196
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Importance of toothfish in the diet of generalist subantarctic killer whales: implications for fisheries interactions |
Autor: | Tixier, Paul; Giménez, Joan CSIC ORCID ; Reisinger, Ryan R.; Méndez-Fernández, Paula; Arnould, John P.Y.; Cherel, Yves; Guinet, Christophe | Palabras clave: | Southern Ocean Fishery interactions Stable isotopes Killer whale Fisheries Diet |
Fecha de publicación: | mar-2019 | Editor: | Inter Research | Citación: | Marine Ecology Progress Series 613: 197-210 (2019) | Resumen: | 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 | Descripción: | 14 pages, 4 figures, 3 tables | Versión del editor: | https://dx.doi.org/10.3354/meps12894 | URI: | http://hdl.handle.net/10261/184196 | DOI: | 10.3354/meps12894 | Identificadores: | doi: 10.3354/meps12894 issn: 0171-8630 e-issn: 1616-1599 |
Aparece en las colecciones: | (ICM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Tixier_et_al_2019.pdf | 377,37 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
30
checked on 20-abr-2024
WEB OF SCIENCETM
Citations
31
checked on 29-feb-2024
Page view(s)
151
checked on 19-abr-2024
Download(s)
177
checked on 19-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Este item está licenciado bajo una Licencia Creative Commons