Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring

Autores
Ibarra, Cynthia; Marinao, Cristian Javier; Suarez, Nicolas Marcelo; Yorio, Pablo Martin
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thus knowledge of their food requirement is fundamental to assess potential conflicts and monitor interactions. We obtained stomach samples from 63 adult Imperial Cormorants during the chick-rearing period in 2014: 32 at Isla Arce and 31 at Isla Vernaci Este. We recorded 27 and 30 prey taxa in stomach samples at Isla Arce and Isla Vernaci Este, respectively, and at least 21 were common to both islands. Significant differences in diet composition in terms of importance by mass were found between young and old chick stages at Isla Arce but not at Isla Vernaci Este. Rock cod (Patagonotothen spp.) were dominant at Isla Vernaci Este during both chick stages (75.7% and 86.5%, respectively). At Isla Arce, rock cod, Argentine anchovy (Engraulis anchoita), and Argentine hake (Merluccius hubbsi) contributed similarly to their diet (26-33%) during the young chick stage, whereas Argentine anchovy dominated during the old chick stage (76.6%). Diet composition in terms of importance by mass was significantly different between colonies. Imperial Cormorant consumed benthic, demersal, and pelagic prey, confirming plasticity in feeding habits, but their contribution differed depending on the site and chick stage. Our results suggest that diet assessments and monitoring the potential interaction between Imperial Cormorant and fisheries should not be based on information from a single breeding stage or location, but requires the analysis of diet composition throughout the breeding cycle with a representative sampling of the 17 colonies within the marine park.
Fil: Ibara Cynthia. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Marinao, Cristian Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Suárez, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Yorio, Pablo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Wildlife Conservation Society; Argentina
Materia
ARGENTINA
DIET
GOLFO SAN JORGE
PHALACROCORAX ATRICEPS
SEABIRDS
SITE DIFFERENCES
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:11336/92687
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/92687
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoringIbarra, CynthiaMarinao, Cristian JavierSuarez, Nicolas MarceloYorio, Pablo MartinARGENTINADIETGOLFO SAN JORGEPHALACROCORAX ATRICEPSSEABIRDSSITE DIFFERENCEShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thus knowledge of their food requirement is fundamental to assess potential conflicts and monitor interactions. We obtained stomach samples from 63 adult Imperial Cormorants during the chick-rearing period in 2014: 32 at Isla Arce and 31 at Isla Vernaci Este. We recorded 27 and 30 prey taxa in stomach samples at Isla Arce and Isla Vernaci Este, respectively, and at least 21 were common to both islands. Significant differences in diet composition in terms of importance by mass were found between young and old chick stages at Isla Arce but not at Isla Vernaci Este. Rock cod (Patagonotothen spp.) were dominant at Isla Vernaci Este during both chick stages (75.7% and 86.5%, respectively). At Isla Arce, rock cod, Argentine anchovy (Engraulis anchoita), and Argentine hake (Merluccius hubbsi) contributed similarly to their diet (26-33%) during the young chick stage, whereas Argentine anchovy dominated during the old chick stage (76.6%). Diet composition in terms of importance by mass was significantly different between colonies. Imperial Cormorant consumed benthic, demersal, and pelagic prey, confirming plasticity in feeding habits, but their contribution differed depending on the site and chick stage. Our results suggest that diet assessments and monitoring the potential interaction between Imperial Cormorant and fisheries should not be based on information from a single breeding stage or location, but requires the analysis of diet composition throughout the breeding cycle with a representative sampling of the 17 colonies within the marine park.Fil: Ibara Cynthia. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Marinao, Cristian Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Suárez, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Yorio, Pablo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Wildlife Conservation Society; ArgentinaWilson Ornithological Society2018-03info: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/11336/92687Ibarra, Cynthia; Marinao, Cristian Javier; Suarez, Nicolas Marcelo; Yorio, Pablo Martin; Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring; Wilson Ornithological Society; Wilson Journal of Ornithology; 130; 1; 3-2018; 224-2341559-4491CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1676/16-184.1info:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/The-Wilson-Journal-of-Ornithology/volume-130/issue-1/16-184.1/Differences-between-colonies-and-chick-rearing-stages-in-Imperial-Cormorant/10.1676/16-184.1.shortinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:32:59Zoai:ri.conicet.gov.ar:11336/92687instacron: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 09:32:59.774CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
title Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
spellingShingle Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
Ibarra, Cynthia
ARGENTINA
DIET
GOLFO SAN JORGE
PHALACROCORAX ATRICEPS
SEABIRDS
SITE DIFFERENCES
title_short Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
title_full Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
title_fullStr Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
title_full_unstemmed Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
title_sort Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
dc.creator.none.fl_str_mv Ibarra, Cynthia
Marinao, Cristian Javier
Suarez, Nicolas Marcelo
Yorio, Pablo Martin
author Ibarra, Cynthia
author_facet Ibarra, Cynthia
Marinao, Cristian Javier
Suarez, Nicolas Marcelo
Yorio, Pablo Martin
author_role author
author2 Marinao, Cristian Javier
Suarez, Nicolas Marcelo
Yorio, Pablo Martin
author2_role author
author
author
dc.subject.none.fl_str_mv ARGENTINA
DIET
GOLFO SAN JORGE
PHALACROCORAX ATRICEPS
SEABIRDS
SITE DIFFERENCES
topic ARGENTINA
DIET
GOLFO SAN JORGE
PHALACROCORAX ATRICEPS
SEABIRDS
SITE DIFFERENCES
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 assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thus knowledge of their food requirement is fundamental to assess potential conflicts and monitor interactions. We obtained stomach samples from 63 adult Imperial Cormorants during the chick-rearing period in 2014: 32 at Isla Arce and 31 at Isla Vernaci Este. We recorded 27 and 30 prey taxa in stomach samples at Isla Arce and Isla Vernaci Este, respectively, and at least 21 were common to both islands. Significant differences in diet composition in terms of importance by mass were found between young and old chick stages at Isla Arce but not at Isla Vernaci Este. Rock cod (Patagonotothen spp.) were dominant at Isla Vernaci Este during both chick stages (75.7% and 86.5%, respectively). At Isla Arce, rock cod, Argentine anchovy (Engraulis anchoita), and Argentine hake (Merluccius hubbsi) contributed similarly to their diet (26-33%) during the young chick stage, whereas Argentine anchovy dominated during the old chick stage (76.6%). Diet composition in terms of importance by mass was significantly different between colonies. Imperial Cormorant consumed benthic, demersal, and pelagic prey, confirming plasticity in feeding habits, but their contribution differed depending on the site and chick stage. Our results suggest that diet assessments and monitoring the potential interaction between Imperial Cormorant and fisheries should not be based on information from a single breeding stage or location, but requires the analysis of diet composition throughout the breeding cycle with a representative sampling of the 17 colonies within the marine park.
Fil: Ibara Cynthia. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Marinao, Cristian Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Suárez, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Yorio, Pablo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina. Wildlife Conservation Society; Argentina
description We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral marine park, and commercial trawl fisheries operate in adjacent waters, thus knowledge of their food requirement is fundamental to assess potential conflicts and monitor interactions. We obtained stomach samples from 63 adult Imperial Cormorants during the chick-rearing period in 2014: 32 at Isla Arce and 31 at Isla Vernaci Este. We recorded 27 and 30 prey taxa in stomach samples at Isla Arce and Isla Vernaci Este, respectively, and at least 21 were common to both islands. Significant differences in diet composition in terms of importance by mass were found between young and old chick stages at Isla Arce but not at Isla Vernaci Este. Rock cod (Patagonotothen spp.) were dominant at Isla Vernaci Este during both chick stages (75.7% and 86.5%, respectively). At Isla Arce, rock cod, Argentine anchovy (Engraulis anchoita), and Argentine hake (Merluccius hubbsi) contributed similarly to their diet (26-33%) during the young chick stage, whereas Argentine anchovy dominated during the old chick stage (76.6%). Diet composition in terms of importance by mass was significantly different between colonies. Imperial Cormorant consumed benthic, demersal, and pelagic prey, confirming plasticity in feeding habits, but their contribution differed depending on the site and chick stage. Our results suggest that diet assessments and monitoring the potential interaction between Imperial Cormorant and fisheries should not be based on information from a single breeding stage or location, but requires the analysis of diet composition throughout the breeding cycle with a representative sampling of the 17 colonies within the marine park.
publishDate 2018
dc.date.none.fl_str_mv 2018-03
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/11336/92687
Ibarra, Cynthia; Marinao, Cristian Javier; Suarez, Nicolas Marcelo; Yorio, Pablo Martin; Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring; Wilson Ornithological Society; Wilson Journal of Ornithology; 130; 1; 3-2018; 224-234
1559-4491
CONICET Digital
CONICET
url http://hdl.handle.net/11336/92687
identifier_str_mv Ibarra, Cynthia; Marinao, Cristian Javier; Suarez, Nicolas Marcelo; Yorio, Pablo Martin; Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring; Wilson Ornithological Society; Wilson Journal of Ornithology; 130; 1; 3-2018; 224-234
1559-4491
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1676/16-184.1
info:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/The-Wilson-Journal-of-Ornithology/volume-130/issue-1/16-184.1/Differences-between-colonies-and-chick-rearing-stages-in-Imperial-Cormorant/10.1676/16-184.1.short
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 Wilson Ornithological Society
publisher.none.fl_str_mv Wilson Ornithological Society
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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