Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia
This study assessed ontogenetic dietary changes in male South American fur sealsArctocephalus australis in northern and central Patagonia (Argentina) using stable isotope ratios (δ15N and δ13C) in vibrissae and bones. Sucking pups were characterised by higher δ15N values and lower δ13C values than o...
| Autores: | ; ; ; ; |
|---|---|
| Tipo de documento: | Artigo |
| Estado: | Published version |
| Data de publicação: | 2015 |
| País: | Argentina |
| Recursos: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositório: | CONICET Digital (CONICET) |
| Idioma: | Inglês |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/21410 |
| Acesso em linha: | http://hdl.handle.net/11336/21410 |
| Nível de acesso: | Acesso com embargo |
| Palavra-chave: | FORAGING ECOLOGY PINNIPED ARCTOCEPHALUS AUSTRALIS ONTOGENETIC DIETARY CHANGE STABLE ISOTOPE ANALYSIS δ15N δ13C PATAGONIA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
| _version_ | 1878404005640536064 |
|---|---|
| author | Vales, Damián Gustavo |
| author2 | Cardona, Luis Garcia, Nestor Anibal Zenteno, Lisette Crespo, Enrique Alberto |
| author2_role | author author author author |
| author_browse | Cardona, Luis Crespo, Enrique Alberto Garcia, Nestor Anibal Vales, Damián Gustavo Zenteno, Lisette |
| author_facet | Vales, Damián Gustavo Cardona, Luis Garcia, Nestor Anibal Zenteno, Lisette Crespo, Enrique Alberto |
| author_role | author |
| collection | CONICET Digital (CONICET) |
| description | This study assessed ontogenetic dietary changes in male South American fur sealsArctocephalus australis in northern and central Patagonia (Argentina) using stable isotope ratios (δ15N and δ13C) in vibrissae and bones. Sucking pups were characterised by higher δ15N values and lower δ13C values than older specimens. Weaning was associated with a marked drop of δ15N values, both in bone and vibrissae. Such a drop was inconsistent with the consumption of local prey and may reveal movement to distant foraging grounds or physiological changes associatedwith either fasting or rapid growth. Stable isotope ratios indicated that juveniles fed more pelagically than subadults and adults, but that there were no major differences between the 2 latter age categories. As subadults and adults are rather similar in body mass and are much larger than juveniles, body mass may play a role in the ontogenetic dietary changes reported. Nevertheless, demersal benthic prey were always scarce in the diet of male fur seals, which relied primarily onArgentine shortfin squid and small pelagic fish throughout life, though adults also consumed large amounts of decapod crustaceans available at shallow depths. Vibrissae did not reveal regular oscillations of δ15N or δ13C, except in 1 individual. Thus, male fur seals from northern and central Patagonia do not appear to migrate regularly between isotopically distinct areas, although nomadic displacements cannot be ruled out. |
| eu_rights_str_mv | embargoedAccess |
| format | article |
| id | AR_e92b530a8aaaa7e61fe05ca1cd2f33e5 |
| identifier_str_mv | Vales, Damián Gustavo; Cardona, Luis; Garcia, Nestor Anibal; Zenteno, Lisette; Crespo, Enrique Alberto; Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia; Inter-Research; Marine Ecology Progress Series; 525; 9-4-2015; 245-260 0171-8630 1616-1599 CONICET Digital CONICET |
| institution | Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str | Consejo Nacional de Investigaciones Científicas y Técnicas |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:ri.conicet.gov.ar:11336/21410 |
| publishDate | 2015 |
| publishDateSort | 2015 |
| publisher | Inter-Research |
| publisherStr | Inter-Research |
| reponame_str | CONICET Digital (CONICET) |
| spelling | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia Vales, Damián Gustavo Cardona, Luis Garcia, Nestor Anibal Zenteno, Lisette Crespo, Enrique Alberto FORAGING ECOLOGY PINNIPED ARCTOCEPHALUS AUSTRALIS ONTOGENETIC DIETARY CHANGE STABLE ISOTOPE ANALYSIS δ15N δ13C PATAGONIA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 This study assessed ontogenetic dietary changes in male South American fur sealsArctocephalus australis in northern and central Patagonia (Argentina) using stable isotope ratios (δ15N and δ13C) in vibrissae and bones. Sucking pups were characterised by higher δ15N values and lower δ13C values than older specimens. Weaning was associated with a marked drop of δ15N values, both in bone and vibrissae. Such a drop was inconsistent with the consumption of local prey and may reveal movement to distant foraging grounds or physiological changes associatedwith either fasting or rapid growth. Stable isotope ratios indicated that juveniles fed more pelagically than subadults and adults, but that there were no major differences between the 2 latter age categories. As subadults and adults are rather similar in body mass and are much larger than juveniles, body mass may play a role in the ontogenetic dietary changes reported. Nevertheless, demersal benthic prey were always scarce in the diet of male fur seals, which relied primarily onArgentine shortfin squid and small pelagic fish throughout life, though adults also consumed large amounts of decapod crustaceans available at shallow depths. Vibrissae did not reveal regular oscillations of δ15N or δ13C, except in 1 individual. Thus, male fur seals from northern and central Patagonia do not appear to migrate regularly between isotopically distinct areas, although nomadic displacements cannot be ruled out. Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Cardona, Luis. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España Fil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Fil: Zenteno, Lisette. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina Inter-Research http://hdl.handle.net/11336/21410 Vales, Damián Gustavo; Cardona, Luis; Garcia, Nestor Anibal; Zenteno, Lisette; Crespo, Enrique Alberto; Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia; Inter-Research; Marine Ecology Progress Series; 525; 9-4-2015; 245-260 0171-8630 1616-1599 CONICET Digital CONICET |
| spellingShingle | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia Vales, Damián Gustavo FORAGING ECOLOGY PINNIPED ARCTOCEPHALUS AUSTRALIS ONTOGENETIC DIETARY CHANGE STABLE ISOTOPE ANALYSIS δ15N δ13C PATAGONIA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
| status_str | publishedVersion |
| title | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia |
| title_full | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia |
| title_fullStr | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia |
| title_full_unstemmed | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia |
| title_short | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia |
| title_sort | Ontogenetic dietary changes in male South American fur seals Arctocephalus australis in Patagonia |
| topic | FORAGING ECOLOGY PINNIPED ARCTOCEPHALUS AUSTRALIS ONTOGENETIC DIETARY CHANGE STABLE ISOTOPE ANALYSIS δ15N δ13C PATAGONIA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
| topic_facet | FORAGING ECOLOGY PINNIPED ARCTOCEPHALUS AUSTRALIS ONTOGENETIC DIETARY CHANGE STABLE ISOTOPE ANALYSIS δ15N δ13C PATAGONIA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
| url | http://hdl.handle.net/11336/21410 |