Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas

Autores
Vales, Damián Gustavo; Saporiti, Fabiana; Cardona, Luis; de Oliveira, Larissa Rosa; Dos Santos, Roberta Aguiar; Secchi, Eduardo R.; Aguilar, Alex; Crespo, Enrique Alberto
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
1. South American fur seals (Arctophoca australis) inhabiting the Río de la Plata plume and adjoining areas are known to forage upon a wide range of prey (i.e. pelagic, demersal and benthic species). 2. Since the 1960s, trawlers have operated in the area, targeting primarily demersal and benthic species. Carbon and nitrogen stable isotope ratios from 54 adult male fur seals dead stranded along the coast of southern Brazil from 1994 to 2011 were analysed to investigate whether the intensification of fishing in Río de la Plata and adjoining areas since the mid-1990s has reduced the availability of benthic and demersal prey to the growing population of South American fur seals. 3. No significant correlation between δ13C or δ15N values and stranding year was found, thus revealing that fur seals maintained a steady diet over 17 years. 4. Reconstruction of the isotopic landscape of the study area using potential prey of fur seals showed a spatial segregation, with prey from southern Brazil typically enriched in 13C and depleted in 15N compared with those from northern Argentina. Most adult male fur seals relied mainly on small pelagic fishes and squid captured on the continental shelf, whereas medium pelagic and demersal?benthic prey played a minor role in the diet. 5. It is concluded that South American fur seals rely on pelagic resources (i.e. small pelagic fish and squid) more strongly than previously thought and that their diet does not reflect the varying abundance of demersal?benthic resources in the area.
Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Saporiti, Fabiana. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; España
Fil: Cardona, Luis. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; España
Fil: de Oliveira, Larissa Rosa. Universidade do Vale do Rio dos Sinos; Brasil
Fil: Dos Santos, Roberta Aguiar. Istituto Chico Mendes de Conservaçao da Biodiversidade; Brasil
Fil: Secchi, Eduardo R.. Universidade de Vale do Rio dos Sinos; Brasil
Fil: Aguilar, Alex. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; España
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Materia
Marine Mammals
Feeding
Fishing
Trawling
Ecosystem Approach
Coastal
Littoral
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:11336/7593
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/7593
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areasVales, Damián GustavoSaporiti, FabianaCardona, Luisde Oliveira, Larissa RosaDos Santos, Roberta AguiarSecchi, Eduardo R.Aguilar, AlexCrespo, Enrique AlbertoMarine MammalsFeedingFishingTrawlingEcosystem ApproachCoastalLittoralhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/11. South American fur seals (Arctophoca australis) inhabiting the Río de la Plata plume and adjoining areas are known to forage upon a wide range of prey (i.e. pelagic, demersal and benthic species). 2. Since the 1960s, trawlers have operated in the area, targeting primarily demersal and benthic species. Carbon and nitrogen stable isotope ratios from 54 adult male fur seals dead stranded along the coast of southern Brazil from 1994 to 2011 were analysed to investigate whether the intensification of fishing in Río de la Plata and adjoining areas since the mid-1990s has reduced the availability of benthic and demersal prey to the growing population of South American fur seals. 3. No significant correlation between δ13C or δ15N values and stranding year was found, thus revealing that fur seals maintained a steady diet over 17 years. 4. Reconstruction of the isotopic landscape of the study area using potential prey of fur seals showed a spatial segregation, with prey from southern Brazil typically enriched in 13C and depleted in 15N compared with those from northern Argentina. Most adult male fur seals relied mainly on small pelagic fishes and squid captured on the continental shelf, whereas medium pelagic and demersal?benthic prey played a minor role in the diet. 5. It is concluded that South American fur seals rely on pelagic resources (i.e. small pelagic fish and squid) more strongly than previously thought and that their diet does not reflect the varying abundance of demersal?benthic resources in the area.Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Saporiti, Fabiana. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; EspañaFil: Cardona, Luis. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; EspañaFil: de Oliveira, Larissa Rosa. Universidade do Vale do Rio dos Sinos; BrasilFil: Dos Santos, Roberta Aguiar. Istituto Chico Mendes de Conservaçao da Biodiversidade; BrasilFil: Secchi, Eduardo R.. Universidade de Vale do Rio dos Sinos; BrasilFil: Aguilar, Alex. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; EspañaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaWiley2013-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/7593Vales, Damián Gustavo; Saporiti, Fabiana; Cardona, Luis; de Oliveira, Larissa Rosa; Dos Santos, Roberta Aguiar; et al.; Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas; Wiley; Aquatic Conservation: Marine And Freshwater Ecosystems; 24; 6; 8-2013; 745-7591052-7613enginfo:eu-repo/semantics/altIdentifier/doi/10.1002/aqc.2397info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/aqc.2397/abstractinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:54:59Zoai:ri.conicet.gov.ar:11336/7593instacron: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 09:54:59.735CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
title Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
spellingShingle Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
Vales, Damián Gustavo
Marine Mammals
Feeding
Fishing
Trawling
Ecosystem Approach
Coastal
Littoral
title_short Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
title_full Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
title_fullStr Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
title_full_unstemmed Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
title_sort Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas
dc.creator.none.fl_str_mv Vales, Damián Gustavo
Saporiti, Fabiana
Cardona, Luis
de Oliveira, Larissa Rosa
Dos Santos, Roberta Aguiar
Secchi, Eduardo R.
Aguilar, Alex
Crespo, Enrique Alberto
author Vales, Damián Gustavo
author_facet Vales, Damián Gustavo
Saporiti, Fabiana
Cardona, Luis
de Oliveira, Larissa Rosa
Dos Santos, Roberta Aguiar
Secchi, Eduardo R.
Aguilar, Alex
Crespo, Enrique Alberto
author_role author
author2 Saporiti, Fabiana
Cardona, Luis
de Oliveira, Larissa Rosa
Dos Santos, Roberta Aguiar
Secchi, Eduardo R.
Aguilar, Alex
Crespo, Enrique Alberto
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Marine Mammals
Feeding
Fishing
Trawling
Ecosystem Approach
Coastal
Littoral
topic Marine Mammals
Feeding
Fishing
Trawling
Ecosystem Approach
Coastal
Littoral
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 1. South American fur seals (Arctophoca australis) inhabiting the Río de la Plata plume and adjoining areas are known to forage upon a wide range of prey (i.e. pelagic, demersal and benthic species). 2. Since the 1960s, trawlers have operated in the area, targeting primarily demersal and benthic species. Carbon and nitrogen stable isotope ratios from 54 adult male fur seals dead stranded along the coast of southern Brazil from 1994 to 2011 were analysed to investigate whether the intensification of fishing in Río de la Plata and adjoining areas since the mid-1990s has reduced the availability of benthic and demersal prey to the growing population of South American fur seals. 3. No significant correlation between δ13C or δ15N values and stranding year was found, thus revealing that fur seals maintained a steady diet over 17 years. 4. Reconstruction of the isotopic landscape of the study area using potential prey of fur seals showed a spatial segregation, with prey from southern Brazil typically enriched in 13C and depleted in 15N compared with those from northern Argentina. Most adult male fur seals relied mainly on small pelagic fishes and squid captured on the continental shelf, whereas medium pelagic and demersal?benthic prey played a minor role in the diet. 5. It is concluded that South American fur seals rely on pelagic resources (i.e. small pelagic fish and squid) more strongly than previously thought and that their diet does not reflect the varying abundance of demersal?benthic resources in the area.
Fil: Vales, Damián Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Saporiti, Fabiana. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; España
Fil: Cardona, Luis. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; España
Fil: de Oliveira, Larissa Rosa. Universidade do Vale do Rio dos Sinos; Brasil
Fil: Dos Santos, Roberta Aguiar. Istituto Chico Mendes de Conservaçao da Biodiversidade; Brasil
Fil: Secchi, Eduardo R.. Universidade de Vale do Rio dos Sinos; Brasil
Fil: Aguilar, Alex. Universidad de Barcelona. Facultad de Biologia. Departamento de Biologia Animal; España
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
description 1. South American fur seals (Arctophoca australis) inhabiting the Río de la Plata plume and adjoining areas are known to forage upon a wide range of prey (i.e. pelagic, demersal and benthic species). 2. Since the 1960s, trawlers have operated in the area, targeting primarily demersal and benthic species. Carbon and nitrogen stable isotope ratios from 54 adult male fur seals dead stranded along the coast of southern Brazil from 1994 to 2011 were analysed to investigate whether the intensification of fishing in Río de la Plata and adjoining areas since the mid-1990s has reduced the availability of benthic and demersal prey to the growing population of South American fur seals. 3. No significant correlation between δ13C or δ15N values and stranding year was found, thus revealing that fur seals maintained a steady diet over 17 years. 4. Reconstruction of the isotopic landscape of the study area using potential prey of fur seals showed a spatial segregation, with prey from southern Brazil typically enriched in 13C and depleted in 15N compared with those from northern Argentina. Most adult male fur seals relied mainly on small pelagic fishes and squid captured on the continental shelf, whereas medium pelagic and demersal?benthic prey played a minor role in the diet. 5. It is concluded that South American fur seals rely on pelagic resources (i.e. small pelagic fish and squid) more strongly than previously thought and that their diet does not reflect the varying abundance of demersal?benthic resources in the area.
publishDate 2013
dc.date.none.fl_str_mv 2013-08
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/11336/7593
Vales, Damián Gustavo; Saporiti, Fabiana; Cardona, Luis; de Oliveira, Larissa Rosa; Dos Santos, Roberta Aguiar; et al.; Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas; Wiley; Aquatic Conservation: Marine And Freshwater Ecosystems; 24; 6; 8-2013; 745-759
1052-7613
url http://hdl.handle.net/11336/7593
identifier_str_mv Vales, Damián Gustavo; Saporiti, Fabiana; Cardona, Luis; de Oliveira, Larissa Rosa; Dos Santos, Roberta Aguiar; et al.; Intensive fishing has not forced dietary change in the South American fur seal (Arctophoca australis) off Río de la Plata and adjoining areas; Wiley; Aquatic Conservation: Marine And Freshwater Ecosystems; 24; 6; 8-2013; 745-759
1052-7613
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1002/aqc.2397
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/aqc.2397/abstract
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
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
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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score 13.13397

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