Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
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, thu...
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ftconicet:oai:ri.conicet.gov.ar:11336/92687 2023-10-09T21:55:15+02:00 Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring Ibarra, Cynthia Marinao, Cristian Javier Suarez, Nicolas Marcelo Yorio, Pablo Martin application/pdf http://hdl.handle.net/11336/92687 eng eng Wilson Ornithological Society 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 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 info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ ARGENTINA DIET GOLFO SAN JORGE PHALACROCORAX ATRICEPS SEABIRDS SITE DIFFERENCES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1676/16-184.1 2023-09-24T18:16:24Z 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. ... Article in Journal/Newspaper Phalacrocorax atriceps CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Austral Patagonia San Juan Argentina Argentine Hake ENVELOPE(15.612,15.612,66.797,66.797) Arce ENVELOPE(-61.167,-61.167,-66.117,-66.117) The Wilson Journal of Ornithology 130 1 224 234 |
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Open Polar |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
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ftconicet |
language |
English |
topic |
ARGENTINA DIET GOLFO SAN JORGE PHALACROCORAX ATRICEPS SEABIRDS SITE DIFFERENCES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
ARGENTINA DIET GOLFO SAN JORGE PHALACROCORAX ATRICEPS SEABIRDS SITE DIFFERENCES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 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 |
topic_facet |
ARGENTINA DIET GOLFO SAN JORGE PHALACROCORAX ATRICEPS SEABIRDS SITE DIFFERENCES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
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. Fil: Ibara Cynthia. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina Fil: Marinao, Cristian Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. ... |
format |
Article in Journal/Newspaper |
author |
Ibarra, Cynthia Marinao, Cristian Javier Suarez, Nicolas Marcelo Yorio, Pablo Martin |
author_facet |
Ibarra, Cynthia Marinao, Cristian Javier Suarez, Nicolas Marcelo Yorio, Pablo Martin |
author_sort |
Ibarra, Cynthia |
title |
Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring |
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 |
publisher |
Wilson Ornithological Society |
url |
http://hdl.handle.net/11336/92687 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) ENVELOPE(-61.167,-61.167,-66.117,-66.117) |
geographic |
Austral Patagonia San Juan Argentina Argentine Hake Arce |
geographic_facet |
Austral Patagonia San Juan Argentina Argentine Hake Arce |
genre |
Phalacrocorax atriceps |
genre_facet |
Phalacrocorax atriceps |
op_relation |
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 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 |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1676/16-184.1 |
container_title |
The Wilson Journal of Ornithology |
container_volume |
130 |
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1 |
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224 |
op_container_end_page |
234 |
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1779319102455676928 |