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dc.contributor.author
Casaux, Ricardo Jorge
dc.date.available
2017-11-24T20:04:46Z
dc.date.issued
2004-12
dc.identifier.citation
Casaux, Ricardo Jorge; Diving patterns in the Antarctic Shag; Waterbird Society; Waterbirds (de Leon Springs, Fla.); 27; 4; 12-2004; 382-387
dc.identifier.issn
1524-4695
dc.identifier.uri
http://hdl.handle.net/11336/29062
dc.description.abstract
The diving patterns of the Antarctic Shag ( Phalacrocorax bransfieldensis ) were studied by direct observation on individuals foraging at Harmony Cove, Nelson Island, South Shetland Islands, during the 1995/96 and 1996/97 breeding seasons. The individuals observed foraged in shallow waters, mainly solitarily and presumably dived aerobically. The shags displayed relatively short diving bouts composed of few dives. During the 1995/96 breeding season, the duration of the dives decreased with the increase in the number of dives per bout and increased with the diving depth. These relationships were not statistically significant in 1996/97. In both seasons, the duration of the dives was positively related with both the surface resting time preceding and succeeding the dive, which may indicate that these birds display anticipatory or reactive dives probably according to the foraging conditions. Shags at the surface were seen swallowing fish longer than 15 cm; smaller fish as well as invertebrates may have been ingested underwater. The mean diving efficiencies of the bouts fall within the range reported for phalacrocoracids, but values of diving efficiency below unity were observed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Waterbird Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Antarctic Shag
dc.subject
Phalacrocorax Bransfieldensis
dc.subject
Diving Patterns
dc.subject
Antarctica
dc.subject.classification
Otras Ciencias Biológicas
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Diving patterns in the Antarctic Shag
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-11-03T20:03:06Z
dc.identifier.eissn
1938-5390
dc.journal.volume
27
dc.journal.number
4
dc.journal.pagination
382-387
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Casaux, Ricardo Jorge. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Waterbirds (de Leon Springs, Fla.)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1675/1524-4695(2004)027[0382:DPITAS]2.0.CO;2
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.bioone.org/doi/abs/10.1675/1524-4695%282004%29027%5B0382%3ADPITAS%5D2.0.CO%3B2
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