Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina

Autores
Herrera, Gonzalo; Punta, Gabriel; Yorio, Pablo Martin
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We studied the diet of breeding Olrog’s Gulls Larus atlanticus during 1994 at two colonies in Golfo San Jorge, Argentina, through the analysis of 207 regurgitated pellets. The diet at Isla Felipe and Isla Vernaci Sudoeste comprised only a few items (9 vs 7 respectively), of which crabs were the main component. At Isla Felipe, the crabs Cyrtograpsus altimanus and C. angulatus were present in 91.2% and 89.2% of pellets, respectively, while the percentage contribution of each species was 76.1% and 21.7%, respectively. At Isla Vernaci Sudoeste, the figures were similar (96.2% and 80% of pellets, and percentage contributions 79.4% and 19.5%). All other taxa were present in less than 11% of pellets. No significant differences were found between colonies in the number of prey items, prey individuals per pellet, and consumption of crabs. Percentage contribution of crabs differed significantly between stages of the breeding cycle at Isla Felipe but not at Isla Vernaci Sudoeste. At both colonies, the proportion of male C. altimanus in pellets was larger than that of females. The proportion of female C. angulatus in pellets at Isla Vernaci Sudoeste was larger than that of males, but no significant differences were found in the consumption of each sex at Isla Felipe. Mean maximum carapace width of male crabs in pellets was not significantly different from that of females at either Isla Felipe or Isla Vernaci. Our study at Golfo San Jorge confirms that Olrog’s Gull is fairly specialized, feeding mainly on crabs during the breeding season.
Fil: Herrera, Gonzalo. Provincia de Chubut. Dirección General de Intereses Marítimos y Pesca Continental; Argentina
Fil: Punta, Gabriel. Provincia de Chubut. Dirección General de Intereses Marítimos y Pesca Continental; Argentina
Fil: Yorio, Pablo Martin. Wildlife Conservation Society; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
Materia
OLROG'S GULL
LARUS ATLANTICUS
BREEDING SEASON
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:11336/105338
Acceder
id CONICETDig_568543bfbfffd620c25da52a41621282
oai_identifier_str oai:ri.conicet.gov.ar:11336/105338
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, ArgentinaHerrera, GonzaloPunta, GabrielYorio, Pablo MartinOLROG'S GULLLARUS ATLANTICUSBREEDING SEASONhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1We studied the diet of breeding Olrog’s Gulls Larus atlanticus during 1994 at two colonies in Golfo San Jorge, Argentina, through the analysis of 207 regurgitated pellets. The diet at Isla Felipe and Isla Vernaci Sudoeste comprised only a few items (9 vs 7 respectively), of which crabs were the main component. At Isla Felipe, the crabs Cyrtograpsus altimanus and C. angulatus were present in 91.2% and 89.2% of pellets, respectively, while the percentage contribution of each species was 76.1% and 21.7%, respectively. At Isla Vernaci Sudoeste, the figures were similar (96.2% and 80% of pellets, and percentage contributions 79.4% and 19.5%). All other taxa were present in less than 11% of pellets. No significant differences were found between colonies in the number of prey items, prey individuals per pellet, and consumption of crabs. Percentage contribution of crabs differed significantly between stages of the breeding cycle at Isla Felipe but not at Isla Vernaci Sudoeste. At both colonies, the proportion of male C. altimanus in pellets was larger than that of females. The proportion of female C. angulatus in pellets at Isla Vernaci Sudoeste was larger than that of males, but no significant differences were found in the consumption of each sex at Isla Felipe. Mean maximum carapace width of male crabs in pellets was not significantly different from that of females at either Isla Felipe or Isla Vernaci. Our study at Golfo San Jorge confirms that Olrog’s Gull is fairly specialized, feeding mainly on crabs during the breeding season.Fil: Herrera, Gonzalo. Provincia de Chubut. Dirección General de Intereses Marítimos y Pesca Continental; ArgentinaFil: Punta, Gabriel. Provincia de Chubut. Dirección General de Intereses Marítimos y Pesca Continental; ArgentinaFil: Yorio, Pablo Martin. Wildlife Conservation Society; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaCambridge University Press2005-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/105338Herrera, Gonzalo; Punta, Gabriel; Yorio, Pablo Martin; Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina; Cambridge University Press; Bird Conservation International; 15; 1; 5-2005; 89-970959-2709CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1017/S0959270905000079info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/bird-conservation-international/article/diet-specialization-of-olrogs-gull-larus-atlanticus-during-the-breeding-season-at-golfo-san-jorge-argentina/508FB2D2F9C5CA7D983B5A5A7B5DE690info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:39:02Zoai:ri.conicet.gov.ar:11336/105338instacron: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:34982025-09-29 09:39:02.57CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
title Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
spellingShingle Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
Herrera, Gonzalo
OLROG'S GULL
LARUS ATLANTICUS
BREEDING SEASON
title_short Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
title_full Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
title_fullStr Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
title_full_unstemmed Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
title_sort Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina
dc.creator.none.fl_str_mv Herrera, Gonzalo
Punta, Gabriel
Yorio, Pablo Martin
author Herrera, Gonzalo
author_facet Herrera, Gonzalo
Punta, Gabriel
Yorio, Pablo Martin
author_role author
author2 Punta, Gabriel
Yorio, Pablo Martin
author2_role author
author
dc.subject.none.fl_str_mv OLROG'S GULL
LARUS ATLANTICUS
BREEDING SEASON
topic OLROG'S GULL
LARUS ATLANTICUS
BREEDING SEASON
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We studied the diet of breeding Olrog’s Gulls Larus atlanticus during 1994 at two colonies in Golfo San Jorge, Argentina, through the analysis of 207 regurgitated pellets. The diet at Isla Felipe and Isla Vernaci Sudoeste comprised only a few items (9 vs 7 respectively), of which crabs were the main component. At Isla Felipe, the crabs Cyrtograpsus altimanus and C. angulatus were present in 91.2% and 89.2% of pellets, respectively, while the percentage contribution of each species was 76.1% and 21.7%, respectively. At Isla Vernaci Sudoeste, the figures were similar (96.2% and 80% of pellets, and percentage contributions 79.4% and 19.5%). All other taxa were present in less than 11% of pellets. No significant differences were found between colonies in the number of prey items, prey individuals per pellet, and consumption of crabs. Percentage contribution of crabs differed significantly between stages of the breeding cycle at Isla Felipe but not at Isla Vernaci Sudoeste. At both colonies, the proportion of male C. altimanus in pellets was larger than that of females. The proportion of female C. angulatus in pellets at Isla Vernaci Sudoeste was larger than that of males, but no significant differences were found in the consumption of each sex at Isla Felipe. Mean maximum carapace width of male crabs in pellets was not significantly different from that of females at either Isla Felipe or Isla Vernaci. Our study at Golfo San Jorge confirms that Olrog’s Gull is fairly specialized, feeding mainly on crabs during the breeding season.
Fil: Herrera, Gonzalo. Provincia de Chubut. Dirección General de Intereses Marítimos y Pesca Continental; Argentina
Fil: Punta, Gabriel. Provincia de Chubut. Dirección General de Intereses Marítimos y Pesca Continental; Argentina
Fil: Yorio, Pablo Martin. Wildlife Conservation Society; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; Argentina
description We studied the diet of breeding Olrog’s Gulls Larus atlanticus during 1994 at two colonies in Golfo San Jorge, Argentina, through the analysis of 207 regurgitated pellets. The diet at Isla Felipe and Isla Vernaci Sudoeste comprised only a few items (9 vs 7 respectively), of which crabs were the main component. At Isla Felipe, the crabs Cyrtograpsus altimanus and C. angulatus were present in 91.2% and 89.2% of pellets, respectively, while the percentage contribution of each species was 76.1% and 21.7%, respectively. At Isla Vernaci Sudoeste, the figures were similar (96.2% and 80% of pellets, and percentage contributions 79.4% and 19.5%). All other taxa were present in less than 11% of pellets. No significant differences were found between colonies in the number of prey items, prey individuals per pellet, and consumption of crabs. Percentage contribution of crabs differed significantly between stages of the breeding cycle at Isla Felipe but not at Isla Vernaci Sudoeste. At both colonies, the proportion of male C. altimanus in pellets was larger than that of females. The proportion of female C. angulatus in pellets at Isla Vernaci Sudoeste was larger than that of males, but no significant differences were found in the consumption of each sex at Isla Felipe. Mean maximum carapace width of male crabs in pellets was not significantly different from that of females at either Isla Felipe or Isla Vernaci. Our study at Golfo San Jorge confirms that Olrog’s Gull is fairly specialized, feeding mainly on crabs during the breeding season.
publishDate 2005
dc.date.none.fl_str_mv 2005-05
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/11336/105338
Herrera, Gonzalo; Punta, Gabriel; Yorio, Pablo Martin; Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina; Cambridge University Press; Bird Conservation International; 15; 1; 5-2005; 89-97
0959-2709
CONICET Digital
CONICET
url http://hdl.handle.net/11336/105338
identifier_str_mv Herrera, Gonzalo; Punta, Gabriel; Yorio, Pablo Martin; Diet specialization of Olrog's Gull Larus atlanticus during the breeding season at Golfo San Jorge, Argentina; Cambridge University Press; Bird Conservation International; 15; 1; 5-2005; 89-97
0959-2709
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1017/S0959270905000079
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/bird-conservation-international/article/diet-specialization-of-olrogs-gull-larus-atlanticus-during-the-breeding-season-at-golfo-san-jorge-argentina/508FB2D2F9C5CA7D983B5A5A7B5DE690
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 Cambridge University Press
publisher.none.fl_str_mv Cambridge University Press
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 13.070432

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