Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina

Food habits of the South American sea lion (Otaria flavescens) off Patagonia were studied by means of stomach content analysis. The samples were collected during 1982–1987 and 1990–1998 in northern and central Patagonia. The samples (n=59) came from individuals found dead on beaches and from animals...

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Detalles Bibliográficos
Autores: Koen Alonso, Mariano, Crespo, Enrique Alberto, Pedraza, Susana Noemi, Garcia, Nestor Anibal, Coscarella, Mariano Alberto
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2000
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/70210
Acceso en línea:http://hdl.handle.net/11336/70210
Access Level:acceso abierto
Palabra clave:South American sea lion
Otaria flavescens
Diet
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
id AR_ea2b0f571f85d75c7f93bfb280ab75e9
oai_identifier_str oai:ri.conicet.gov.ar:11336/70210
network_acronym_str AR
network_name_str Argentina
repository_id_str
dc.title.none.fl_str_mv Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
title Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
spellingShingle Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
Koen Alonso, Mariano
South American sea lion
Otaria flavescens
Diet
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
title_short Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
title_full Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
title_fullStr Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
title_full_unstemmed Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
title_sort Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
dc.creator.none.fl_str_mv Koen Alonso, Mariano
Crespo, Enrique Alberto
Pedraza, Susana Noemi
Garcia, Nestor Anibal
Coscarella, Mariano Alberto
author Koen Alonso, Mariano
author_facet Koen Alonso, Mariano
Crespo, Enrique Alberto
Pedraza, Susana Noemi
Garcia, Nestor Anibal
Coscarella, Mariano Alberto
author_role author
author2 Crespo, Enrique Alberto
Pedraza, Susana Noemi
Garcia, Nestor Anibal
Coscarella, Mariano Alberto
author2_role author
author
author
author
dc.subject.none.fl_str_mv South American sea lion
Otaria flavescens
Diet
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
topic South American sea lion
Otaria flavescens
Diet
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
description Food habits of the South American sea lion (Otaria flavescens) off Patagonia were studied by means of stomach content analysis. The samples were collected during 1982–1987 and 1990–1998 in northern and central Patagonia. The samples (n=59) came from individuals found dead on beaches and from animals recovered in incidental catches of the fi shery. Forty-one prey species (including fishes, cephalopods, crustaceans, gastropods, polychetes, sponges, and tunicates) were identified; most important were Argentine hake (Merluccius hubbsi), red octopus (Enteroctopus megalocyathus), Argentine shortfi n squid (Illex argentinus), “raneya” (Raneya brasiliensis), Patagonian squid (Loligo gahi), and Argentine anchovy (Engraulis anchoita). Differences in diet were found between sexes but not between geographical area of sampling, period of sampling, or source of samples. Females fed mostly on ben-thic species, whereas males fed mostly on demersal-pelagic species. The difference in diet between sexes was associated with different feeding grounds or different home ranges and could be produced by different constraints in the feeding behavior of each sex. These different constraints and restrictions could lead females to feed in more coastal and shallower waters than those waters where males feed. Some of the important prey were commercial species (Argentine hake, Argentine shortfin squid, Patagonian squid) consumed at both commercial and noncommercial sizes by sea lions. The presence of gastroliths was independent of the presence of stomach parasites; however, gastrolith weight was positively correlated with individual sea lion’s length, indicating that gastroliths could be involved in buoyancy control. In summary, these stomach content analyses indicate that South American sea lions feed primarily on demersal and benthic species and, in general terms, use resources according to their environmental availability.
publishDate 2000
dc.date.none.fl_str_mv 2000-12
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/11336/70210
Koen Alonso, Mariano; Crespo, Enrique Alberto; Pedraza, Susana Noemi; Garcia, Nestor Anibal; Coscarella, Mariano Alberto; Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina; NOAA's National Marine Fisheries Service. Scientific Publications Office; Fishery Bulletin; 98; 2; 12-2000; 250-263
0090-0656
CONICET Digital
CONICET
url http://hdl.handle.net/11336/70210
identifier_str_mv Koen Alonso, Mariano; Crespo, Enrique Alberto; Pedraza, Susana Noemi; Garcia, Nestor Anibal; Coscarella, Mariano Alberto; Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina; NOAA's National Marine Fisheries Service. Scientific Publications Office; Fishery Bulletin; 98; 2; 12-2000; 250-263
0090-0656
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://spo.nmfs.noaa.gov/content/food-habits-south-american-sea-lion-otaria-flavescens-patagonia-argentina
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
dc.publisher.none.fl_str_mv NOAA's National Marine Fisheries Service. Scientific Publications Office
publisher.none.fl_str_mv NOAA's National Marine Fisheries Service. Scientific Publications Office
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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
_version_ 1799195766539943936
spelling Food habits of the south american sea lion, Otaria flavescens, off Patagonia, ArgentinaKoen Alonso, MarianoCrespo, Enrique AlbertoPedraza, Susana NoemiGarcia, Nestor AnibalCoscarella, Mariano AlbertoSouth American sea lionOtaria flavescensDiethttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Food habits of the South American sea lion (Otaria flavescens) off Patagonia were studied by means of stomach content analysis. The samples were collected during 1982–1987 and 1990–1998 in northern and central Patagonia. The samples (n=59) came from individuals found dead on beaches and from animals recovered in incidental catches of the fi shery. Forty-one prey species (including fishes, cephalopods, crustaceans, gastropods, polychetes, sponges, and tunicates) were identified; most important were Argentine hake (Merluccius hubbsi), red octopus (Enteroctopus megalocyathus), Argentine shortfi n squid (Illex argentinus), “raneya” (Raneya brasiliensis), Patagonian squid (Loligo gahi), and Argentine anchovy (Engraulis anchoita). Differences in diet were found between sexes but not between geographical area of sampling, period of sampling, or source of samples. Females fed mostly on ben-thic species, whereas males fed mostly on demersal-pelagic species. The difference in diet between sexes was associated with different feeding grounds or different home ranges and could be produced by different constraints in the feeding behavior of each sex. These different constraints and restrictions could lead females to feed in more coastal and shallower waters than those waters where males feed. Some of the important prey were commercial species (Argentine hake, Argentine shortfin squid, Patagonian squid) consumed at both commercial and noncommercial sizes by sea lions. The presence of gastroliths was independent of the presence of stomach parasites; however, gastrolith weight was positively correlated with individual sea lion’s length, indicating that gastroliths could be involved in buoyancy control. In summary, these stomach content analyses indicate that South American sea lions feed primarily on demersal and benthic species and, in general terms, use resources according to their environmental availability.Fil: Koen Alonso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Coscarella, Mariano Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaNOAA's National Marine Fisheries Service. Scientific Publications Office2000-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/70210Koen Alonso, Mariano; Crespo, Enrique Alberto; Pedraza, Susana Noemi; Garcia, Nestor Anibal; Coscarella, Mariano Alberto; Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina; NOAA's National Marine Fisheries Service. Scientific Publications Office; Fishery Bulletin; 98; 2; 12-2000; 250-2630090-0656CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://spo.nmfs.noaa.gov/content/food-habits-south-american-sea-lion-otaria-flavescens-patagonia-argentinainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:02:47Zoai:ri.conicet.gov.ar:11336/70210instacron: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:34982024-05-08 14:02:48.153CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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