Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis

Autores
Zenteno, Lisette; Crespo, Enrique Alberto; Vales, Damián Gustavo; Silva, Laura Alejandra; Saporiti, Fabiana; Oliveira, Larissa R.; Secchi, Eduardo Resende; Drago, M.; Aguilar, A.; Cardona, Luis
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Marine predators may undergo remarkable dietary changes through time as a result of both anthropogenic and natural changes in the environment, but this variability is often difficult to tackle and seldom incorporated into ecosystem models. This paper uses the stable isotope ratios of carbon and nitrogen in skeletal material of South American sea lions from Brazilian scientific collections to investigate whether these animals modified their diet from 1986 to 2009, as reported for other marine predators in the region. Stable isotope ratios indicated that demersal potential prey were always enriched in 13C as compared with pelagic prey. Accordingly, the absence of any statistically significant correlation between stranding year and the δ13C values of adult males indicated no major increase in the consumption of pelagic prey from 1986 to 2009. Likewise, the results of the mixing model SIAR revealed a mixed diet including pelagic and demersal prey, with a central role for demersal fishes throughout the whole period. Furthermore, SIAR suggested no major changes in the proportion of pelagic and demersal prey in the diet of adult male South American sea lions during the past three decades. Demersal fishes were also relevant prey for juvenile South American sea lions during the whole period, but they always consumed a larger proportion of pelagic prey than the adults did. These results suggest no major changes in the diet of male South American sea lions during the past three decades in southern Brazil, contrary to what has been reported for other to predators in the regions and for the species in northern Patagonia.
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
Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Silva, Laura Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Saporiti, Fabiana. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España
Fil: Oliveira, Larissa R.. Study Group of Aquatic Mammals of Rio Grande do Sul ; Brasil
Fil: Secchi, Eduardo Resende. Universidade Federal Do Rio Grande; Brasil
Fil: Drago, M.. Universidad de la República; Uruguay
Fil: Aguilar, A.. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España
Fil: Cardona, Luis. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España
Materia
South American Sea Lion
Otaria Flavescens
Stable Isotope Analysis
Diet
Southern Brazil
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/21470
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysisZenteno, LisetteCrespo, Enrique AlbertoVales, Damián GustavoSilva, Laura AlejandraSaporiti, FabianaOliveira, Larissa R.Secchi, Eduardo ResendeDrago, M.Aguilar, A.Cardona, LuisSouth American Sea LionOtaria FlavescensStable Isotope AnalysisDietSouthern Brazilhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Marine predators may undergo remarkable dietary changes through time as a result of both anthropogenic and natural changes in the environment, but this variability is often difficult to tackle and seldom incorporated into ecosystem models. This paper uses the stable isotope ratios of carbon and nitrogen in skeletal material of South American sea lions from Brazilian scientific collections to investigate whether these animals modified their diet from 1986 to 2009, as reported for other marine predators in the region. Stable isotope ratios indicated that demersal potential prey were always enriched in 13C as compared with pelagic prey. Accordingly, the absence of any statistically significant correlation between stranding year and the δ13C values of adult males indicated no major increase in the consumption of pelagic prey from 1986 to 2009. Likewise, the results of the mixing model SIAR revealed a mixed diet including pelagic and demersal prey, with a central role for demersal fishes throughout the whole period. Furthermore, SIAR suggested no major changes in the proportion of pelagic and demersal prey in the diet of adult male South American sea lions during the past three decades. Demersal fishes were also relevant prey for juvenile South American sea lions during the whole period, but they always consumed a larger proportion of pelagic prey than the adults did. These results suggest no major changes in the diet of male South American sea lions during the past three decades in southern Brazil, contrary to what has been reported for other to predators in the regions and for the species in northern Patagonia.Fil: Zenteno, Lisette. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; EspañaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Silva, Laura Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Saporiti, Fabiana. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; EspañaFil: Oliveira, Larissa R.. Study Group of Aquatic Mammals of Rio Grande do Sul ; BrasilFil: Secchi, Eduardo Resende. Universidade Federal Do Rio Grande; BrasilFil: Drago, M.. Universidad de la República; UruguayFil: Aguilar, A.. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; EspañaFil: Cardona, Luis. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; EspañaSpringer Verlag Berlín2014-12-24info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/21470Zenteno, Lisette; Crespo, Enrique Alberto; Vales, Damián Gustavo; Silva, Laura Alejandra; Saporiti, Fabiana; et al.; Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis; Springer Verlag Berlín; Marine Biology; 162; 2; 24-12-2014; 275-2890025-31621432-1793CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-014-2597-1info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00227-014-2597-1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:43:37Zoai:ri.conicet.gov.ar:11336/21470instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:43:37.557CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
title Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
spellingShingle Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
Zenteno, Lisette
South American Sea Lion
Otaria Flavescens
Stable Isotope Analysis
Diet
Southern Brazil
title_short Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
title_full Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
title_fullStr Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
title_full_unstemmed Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
title_sort Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis
dc.creator.none.fl_str_mv Zenteno, Lisette
Crespo, Enrique Alberto
Vales, Damián Gustavo
Silva, Laura Alejandra
Saporiti, Fabiana
Oliveira, Larissa R.
Secchi, Eduardo Resende
Drago, M.
Aguilar, A.
Cardona, Luis
author Zenteno, Lisette
author_facet Zenteno, Lisette
Crespo, Enrique Alberto
Vales, Damián Gustavo
Silva, Laura Alejandra
Saporiti, Fabiana
Oliveira, Larissa R.
Secchi, Eduardo Resende
Drago, M.
Aguilar, A.
Cardona, Luis
author_role author
author2 Crespo, Enrique Alberto
Vales, Damián Gustavo
Silva, Laura Alejandra
Saporiti, Fabiana
Oliveira, Larissa R.
Secchi, Eduardo Resende
Drago, M.
Aguilar, A.
Cardona, Luis
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv South American Sea Lion
Otaria Flavescens
Stable Isotope Analysis
Diet
Southern Brazil
topic South American Sea Lion
Otaria Flavescens
Stable Isotope Analysis
Diet
Southern Brazil
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Marine predators may undergo remarkable dietary changes through time as a result of both anthropogenic and natural changes in the environment, but this variability is often difficult to tackle and seldom incorporated into ecosystem models. This paper uses the stable isotope ratios of carbon and nitrogen in skeletal material of South American sea lions from Brazilian scientific collections to investigate whether these animals modified their diet from 1986 to 2009, as reported for other marine predators in the region. Stable isotope ratios indicated that demersal potential prey were always enriched in 13C as compared with pelagic prey. Accordingly, the absence of any statistically significant correlation between stranding year and the δ13C values of adult males indicated no major increase in the consumption of pelagic prey from 1986 to 2009. Likewise, the results of the mixing model SIAR revealed a mixed diet including pelagic and demersal prey, with a central role for demersal fishes throughout the whole period. Furthermore, SIAR suggested no major changes in the proportion of pelagic and demersal prey in the diet of adult male South American sea lions during the past three decades. Demersal fishes were also relevant prey for juvenile South American sea lions during the whole period, but they always consumed a larger proportion of pelagic prey than the adults did. These results suggest no major changes in the diet of male South American sea lions during the past three decades in southern Brazil, contrary to what has been reported for other to predators in the regions and for the species in northern Patagonia.
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
Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Silva, Laura Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Saporiti, Fabiana. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España
Fil: Oliveira, Larissa R.. Study Group of Aquatic Mammals of Rio Grande do Sul ; Brasil
Fil: Secchi, Eduardo Resende. Universidade Federal Do Rio Grande; Brasil
Fil: Drago, M.. Universidad de la República; Uruguay
Fil: Aguilar, A.. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España
Fil: Cardona, Luis. Universidad de Barcelona. Facultad de Biología. Departamento de Biología Animal; España
description Marine predators may undergo remarkable dietary changes through time as a result of both anthropogenic and natural changes in the environment, but this variability is often difficult to tackle and seldom incorporated into ecosystem models. This paper uses the stable isotope ratios of carbon and nitrogen in skeletal material of South American sea lions from Brazilian scientific collections to investigate whether these animals modified their diet from 1986 to 2009, as reported for other marine predators in the region. Stable isotope ratios indicated that demersal potential prey were always enriched in 13C as compared with pelagic prey. Accordingly, the absence of any statistically significant correlation between stranding year and the δ13C values of adult males indicated no major increase in the consumption of pelagic prey from 1986 to 2009. Likewise, the results of the mixing model SIAR revealed a mixed diet including pelagic and demersal prey, with a central role for demersal fishes throughout the whole period. Furthermore, SIAR suggested no major changes in the proportion of pelagic and demersal prey in the diet of adult male South American sea lions during the past three decades. Demersal fishes were also relevant prey for juvenile South American sea lions during the whole period, but they always consumed a larger proportion of pelagic prey than the adults did. These results suggest no major changes in the diet of male South American sea lions during the past three decades in southern Brazil, contrary to what has been reported for other to predators in the regions and for the species in northern Patagonia.
publishDate 2014
dc.date.none.fl_str_mv 2014-12-24
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/21470
Zenteno, Lisette; Crespo, Enrique Alberto; Vales, Damián Gustavo; Silva, Laura Alejandra; Saporiti, Fabiana; et al.; Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis; Springer Verlag Berlín; Marine Biology; 162; 2; 24-12-2014; 275-289
0025-3162
1432-1793
CONICET Digital
CONICET
url http://hdl.handle.net/11336/21470
identifier_str_mv Zenteno, Lisette; Crespo, Enrique Alberto; Vales, Damián Gustavo; Silva, Laura Alejandra; Saporiti, Fabiana; et al.; Dietary consistency of male South American sea lions (Otaria flavescens) in southern Brazil during three decades inferred from stable isotope analysis; Springer Verlag Berlín; Marine Biology; 162; 2; 24-12-2014; 275-289
0025-3162
1432-1793
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s00227-014-2597-1
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00227-014-2597-1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer Verlag Berlín
publisher.none.fl_str_mv Springer Verlag Berlín
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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