Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource
This work had two aims related to the diet of brown skuas (Stercorarius antarcticus lonnbergi) breeding at Laurie Island (South Orkney Islands, Antarctic). The first aim was to explore whether there are changes throughout the breeding season. The second aim was to determine whether those changes rel...
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ftconicet:oai:ri.conicet.gov.ar:11336/36445 2023-10-09T21:47:05+02:00 Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource Graña Grilli, Maricel Montalti, Diego application/pdf http://hdl.handle.net/11336/36445 eng eng Springer info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-014-1627-2 info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-014-1627-2 http://hdl.handle.net/11336/36445 Graña Grilli, Maricel; Montalti, Diego; Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource; Springer; Polar Biology; 38; 5; 11-2014; 643-649 0722-4060 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Brown Skua Diet Study Pellets Resource Availability Stercorariusantarcticus Lonnbergi 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/10.1007/s00300-014-1627-2 2023-09-24T18:21:59Z This work had two aims related to the diet of brown skuas (Stercorarius antarcticus lonnbergi) breeding at Laurie Island (South Orkney Islands, Antarctic). The first aim was to explore whether there are changes throughout the breeding season. The second aim was to determine whether those changes relate to differences in food resource availability of their main prey, penguins, at different time periods of the penguins’ breeding cycles, or to different moments of the skuas breeding cycle, which may variably restrict the foraging activities of parents. Diet was analyzed from pellet samples grouped in two different ways. They were grouped in three periods defined for the skuas breeding cycle (laying and incubation; early parental care; later parental care), or the pellets were assigned to five periods based on the type of food resources available at the penguin colonies (eggs; eggs and small chicks; small and large chicks; large and fledged chicks; fledged chicks). A temporal variation in diet composition was evident from the analysis of contingency tables for both sample grouping methods. The more represented item in every period for both analyses was adult penguins, which may be related to the proposed cleaning function of the gut of penguin feathers. Both ways of grouping the samples suggest a relationship between the kind of resources available at the penguin colonies and the easiness of delivering them to the skuas chicks, reflected in a successive predominance of use of penguin eggs first and of penguin chicks and other birds later. Fil: Graña Grilli, Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico Zoología Vertebrados; Argentina Fil: Montalti, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de ... Article in Journal/Newspaper Antarc* Antarctic antarcticus Brown Skua Dirección Nacional del Antártico Instituto Antártico Argentino Laurie Island Polar Biology South Orkney Islands Stercorarius antarcticus CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Argentino Argentina South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Laurie ENVELOPE(-44.616,-44.616,-60.733,-60.733) Laurie Island ENVELOPE(-44.617,-44.617,-60.733,-60.733) Polar Biology 38 5 643 649 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Brown Skua Diet Study Pellets Resource Availability Stercorariusantarcticus Lonnbergi https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Brown Skua Diet Study Pellets Resource Availability Stercorariusantarcticus Lonnbergi https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Graña Grilli, Maricel Montalti, Diego Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource |
topic_facet |
Brown Skua Diet Study Pellets Resource Availability Stercorariusantarcticus Lonnbergi https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
This work had two aims related to the diet of brown skuas (Stercorarius antarcticus lonnbergi) breeding at Laurie Island (South Orkney Islands, Antarctic). The first aim was to explore whether there are changes throughout the breeding season. The second aim was to determine whether those changes relate to differences in food resource availability of their main prey, penguins, at different time periods of the penguins’ breeding cycles, or to different moments of the skuas breeding cycle, which may variably restrict the foraging activities of parents. Diet was analyzed from pellet samples grouped in two different ways. They were grouped in three periods defined for the skuas breeding cycle (laying and incubation; early parental care; later parental care), or the pellets were assigned to five periods based on the type of food resources available at the penguin colonies (eggs; eggs and small chicks; small and large chicks; large and fledged chicks; fledged chicks). A temporal variation in diet composition was evident from the analysis of contingency tables for both sample grouping methods. The more represented item in every period for both analyses was adult penguins, which may be related to the proposed cleaning function of the gut of penguin feathers. Both ways of grouping the samples suggest a relationship between the kind of resources available at the penguin colonies and the easiness of delivering them to the skuas chicks, reflected in a successive predominance of use of penguin eggs first and of penguin chicks and other birds later. Fil: Graña Grilli, Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico Zoología Vertebrados; Argentina Fil: Montalti, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de ... |
format |
Article in Journal/Newspaper |
author |
Graña Grilli, Maricel Montalti, Diego |
author_facet |
Graña Grilli, Maricel Montalti, Diego |
author_sort |
Graña Grilli, Maricel |
title |
Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource |
title_short |
Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource |
title_full |
Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource |
title_fullStr |
Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource |
title_full_unstemmed |
Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource |
title_sort |
variation in diet composition during the breeding cycle of an antarctic seabird in relation to its breeding chronology and that of its main food resource |
publisher |
Springer |
url |
http://hdl.handle.net/11336/36445 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-44.616,-44.616,-60.733,-60.733) ENVELOPE(-44.617,-44.617,-60.733,-60.733) |
geographic |
Antarctic Argentino Argentina South Orkney Islands Laurie Laurie Island |
geographic_facet |
Antarctic Argentino Argentina South Orkney Islands Laurie Laurie Island |
genre |
Antarc* Antarctic antarcticus Brown Skua Dirección Nacional del Antártico Instituto Antártico Argentino Laurie Island Polar Biology South Orkney Islands Stercorarius antarcticus |
genre_facet |
Antarc* Antarctic antarcticus Brown Skua Dirección Nacional del Antártico Instituto Antártico Argentino Laurie Island Polar Biology South Orkney Islands Stercorarius antarcticus |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-014-1627-2 info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00300-014-1627-2 http://hdl.handle.net/11336/36445 Graña Grilli, Maricel; Montalti, Diego; Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource; Springer; Polar Biology; 38; 5; 11-2014; 643-649 0722-4060 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1007/s00300-014-1627-2 |
container_title |
Polar Biology |
container_volume |
38 |
container_issue |
5 |
container_start_page |
643 |
op_container_end_page |
649 |
_version_ |
1779309817984188416 |