Food habits of the south american sea lion, Otaria flavescens, off Patagonia, Argentina
- Autores
- Koen Alonso, Mariano; Crespo, Enrique Alberto; Pedraza, Susana Noemi; Garcia, Nestor Anibal; Coscarella, Mariano Alberto
- Año de publicación
- 2000
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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.
Fil: Koen Alonso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Fil: Coscarella, Mariano Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina - Materia
-
South American sea lion
Otaria flavescens
Diet - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/70210
Ver los metadatos del registro completo
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oai:ri.conicet.gov.ar:11336/70210 |
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3498 |
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CONICET Digital (CONICET) |
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 Técnicas2025-09-03T10:00:31Zoai: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:34982025-09-03 10:00:32.112CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
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 |
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 |
topic |
South American sea lion Otaria flavescens Diet |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
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. Fil: Koen Alonso, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Crespo, Enrique Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Pedraza, Susana Noemi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Garcia, Nestor Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina Fil: Coscarella, Mariano Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina |
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 |
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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1842269643497013248 |
score |
13.13397 |