Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events
We identified a range of foraging strategies adopted by grey-headed albatrosses Thalassarche chrysostoma rearing chicks at Bird Island, South Georgia, by simultaneously using satellite telemetry, wet/dry activity recorders and stomach temperature loggers. The albatrosses foraged mostly over oceanic...
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ftispalisboa:oai:repositorio.ispa.pt:10400.12/1468 2023-05-15T13:54:46+02:00 Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events Catry, Paulo Phillips, Richard A. Phalan, Ben Silk, Janet R. D. Croxall, John P. 2012-06-15T19:55:40Z http://hdl.handle.net/10400.12/1468 eng eng Inter-Research Marine Ecology Progress Series, 280, 261-273 0171-8630 http://hdl.handle.net/10400.12/1468 restrictedAccess Seabird Feeding behaviour Stomach temperature Salp Jellyfish South Georgia article 2012 ftispalisboa 2022-05-30T08:45:12Z We identified a range of foraging strategies adopted by grey-headed albatrosses Thalassarche chrysostoma rearing chicks at Bird Island, South Georgia, by simultaneously using satellite telemetry, wet/dry activity recorders and stomach temperature loggers. The albatrosses foraged mostly over oceanic waters, probably associated with the Polar Front north of South Georgia, and also over shelf-slope waters around the Antarctic Peninsula. After leaving the colony, birds commuted to areas with predictable prey concentrations, where they remained for several days. During search periods, birds landed more often and had a higher intake rate, but spent the same proportion of time in flight as on commuting days. Although intake rates were particularly high in shelf-break waters around the Antarctic Peninsula (only one individual foraged in this area), prey were also consumed in reasonable quantities during commuting flights. While at sea, birds spent most (81%) of the day flying, and most (94%) of the night resting on the water. A considerable proportion (26% by mass) of prey was consumed during darkness. The majority of prey were detected and captured during search flights, but 35% were located while sitting on the sea surface. Many ingestion events (up to 27% of the overall food intake) showed temperature signatures characteristic of fluids, suggesting that albatrosses may feed on gelatinous and rapidly digested prey (e.g. salps and jellyfish) much more often than previously suspected. Diet samples delivered to the chicks comprised mostly squid (particularly Martialia hyadesi) and Antarctic krill Euphausia superba. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Bird Island Euphausia superba Instituto Universitário de Ciências Psicológicas, Sociais e da Vida: Repositório do ISPA Antarctic The Antarctic Antarctic Peninsula Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
institution |
Open Polar |
collection |
Instituto Universitário de Ciências Psicológicas, Sociais e da Vida: Repositório do ISPA |
op_collection_id |
ftispalisboa |
language |
English |
topic |
Seabird Feeding behaviour Stomach temperature Salp Jellyfish South Georgia |
spellingShingle |
Seabird Feeding behaviour Stomach temperature Salp Jellyfish South Georgia Catry, Paulo Phillips, Richard A. Phalan, Ben Silk, Janet R. D. Croxall, John P. Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events |
topic_facet |
Seabird Feeding behaviour Stomach temperature Salp Jellyfish South Georgia |
description |
We identified a range of foraging strategies adopted by grey-headed albatrosses Thalassarche chrysostoma rearing chicks at Bird Island, South Georgia, by simultaneously using satellite telemetry, wet/dry activity recorders and stomach temperature loggers. The albatrosses foraged mostly over oceanic waters, probably associated with the Polar Front north of South Georgia, and also over shelf-slope waters around the Antarctic Peninsula. After leaving the colony, birds commuted to areas with predictable prey concentrations, where they remained for several days. During search periods, birds landed more often and had a higher intake rate, but spent the same proportion of time in flight as on commuting days. Although intake rates were particularly high in shelf-break waters around the Antarctic Peninsula (only one individual foraged in this area), prey were also consumed in reasonable quantities during commuting flights. While at sea, birds spent most (81%) of the day flying, and most (94%) of the night resting on the water. A considerable proportion (26% by mass) of prey was consumed during darkness. The majority of prey were detected and captured during search flights, but 35% were located while sitting on the sea surface. Many ingestion events (up to 27% of the overall food intake) showed temperature signatures characteristic of fluids, suggesting that albatrosses may feed on gelatinous and rapidly digested prey (e.g. salps and jellyfish) much more often than previously suspected. Diet samples delivered to the chicks comprised mostly squid (particularly Martialia hyadesi) and Antarctic krill Euphausia superba. |
format |
Article in Journal/Newspaper |
author |
Catry, Paulo Phillips, Richard A. Phalan, Ben Silk, Janet R. D. Croxall, John P. |
author_facet |
Catry, Paulo Phillips, Richard A. Phalan, Ben Silk, Janet R. D. Croxall, John P. |
author_sort |
Catry, Paulo |
title |
Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events |
title_short |
Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events |
title_full |
Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events |
title_fullStr |
Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events |
title_full_unstemmed |
Foraging strategies of grey-headed albatrosses Thalassarche chrysostoma: Integration of movements, activity and feeding events |
title_sort |
foraging strategies of grey-headed albatrosses thalassarche chrysostoma: integration of movements, activity and feeding events |
publisher |
Inter-Research |
publishDate |
2012 |
url |
http://hdl.handle.net/10400.12/1468 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Bird Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Bird Island |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Bird Island Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Bird Island Euphausia superba |
op_relation |
Marine Ecology Progress Series, 280, 261-273 0171-8630 http://hdl.handle.net/10400.12/1468 |
op_rights |
restrictedAccess |
_version_ |
1766260868187684864 |