Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands
Background: According to central place foraging theory, animals will only increase the distance of their foraging trips if more distant prey patches offer better foraging opportunities. Thus, theory predicts that breeding seabirds in large colonies could create a zone of food depletion around the co...
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BioMed Central
2021
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Online Access: | https://arro.anglia.ac.uk/id/eprint/706557/ https://arro.anglia.ac.uk/id/eprint/706557/6/Phillips_et_al_2021.pdf https://doi.org/10.1186/s40462-021-00261-x |
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ftarro:oai:arro.anglia.ac.uk:706557 2023-05-15T14:01:02+02:00 Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands Phillips, Jessica A. Fayet, Annette L. Guilford, Tim Manco, Fabrizio Warwick-Evans, Victoria Trathan, Philip N. 2021-05-04 text https://arro.anglia.ac.uk/id/eprint/706557/ https://arro.anglia.ac.uk/id/eprint/706557/6/Phillips_et_al_2021.pdf https://doi.org/10.1186/s40462-021-00261-x en eng BioMed Central https://arro.anglia.ac.uk/id/eprint/706557/6/Phillips_et_al_2021.pdf Phillips, Jessica A., Fayet, Annette L., Guilford, Tim, Manco, Fabrizio, Warwick-Evans, Victoria and Trathan, Philip N. (2021) Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands. Movement Ecology, 9 (1). p. 22. ISSN 2051-3933 cc_by_4 CC-BY Journal Article PeerReviewed 2021 ftarro https://doi.org/10.1186/s40462-021-00261-x 2022-11-20T21:35:54Z Background: According to central place foraging theory, animals will only increase the distance of their foraging trips if more distant prey patches offer better foraging opportunities. Thus, theory predicts that breeding seabirds in large colonies could create a zone of food depletion around the colony, known as “Ashmole’s halo”. However, seabirds’ decisions to forage at a particular distance are likely also complicated by their breeding stage. After chicks hatch, parents must return frequently to feed their offspring, so may be less likely to visit distant foraging patches, even if their quality is higher. However, the interaction between prey availability, intra-specific competition, and breeding stage on the foraging decisions of seabirds is not well understood. The aim of this study was to address this question in chinstrap penguins Pygoscelis antarcticus breeding at a large colony. In particular, we aimed to investigate how breeding stage affects foraging strategy; whether birds foraging far from the colony visit higher quality patches than available locally; and whether there is evidence for intraspecific competition, indicated by prey depletions near the colony increasing over time, and longer foraging trips. Methods: We used GPS and temperature-depth recorders to track the foraging movements of 221 chinstrap penguins from 4 sites at the South Orkney Islands during incubation and brood. We identified foraging dives and calculated the index of patch quality based on time allocation during the dive to assess the quality of the foraging patch. Results: We found that chinstrap penguin foraging distance varied between stages, and that trips became shorter as incubation progressed. Although patch quality was lower near the colony than at more distant foraging patches, patch quality near the colony improved over the breeding season. Conclusions: These results suggest chinstrap penguin foraging strategies are influenced by both breeding stage and prey distribution, and the low patch quality near the colony may ... Article in Journal/Newspaper Antarc* antarcticus Chinstrap penguin South Orkney Islands Anglia Ruskin University: Anglia Ruskin Research Online (ARRO) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Movement Ecology 9 1 |
institution |
Open Polar |
collection |
Anglia Ruskin University: Anglia Ruskin Research Online (ARRO) |
op_collection_id |
ftarro |
language |
English |
description |
Background: According to central place foraging theory, animals will only increase the distance of their foraging trips if more distant prey patches offer better foraging opportunities. Thus, theory predicts that breeding seabirds in large colonies could create a zone of food depletion around the colony, known as “Ashmole’s halo”. However, seabirds’ decisions to forage at a particular distance are likely also complicated by their breeding stage. After chicks hatch, parents must return frequently to feed their offspring, so may be less likely to visit distant foraging patches, even if their quality is higher. However, the interaction between prey availability, intra-specific competition, and breeding stage on the foraging decisions of seabirds is not well understood. The aim of this study was to address this question in chinstrap penguins Pygoscelis antarcticus breeding at a large colony. In particular, we aimed to investigate how breeding stage affects foraging strategy; whether birds foraging far from the colony visit higher quality patches than available locally; and whether there is evidence for intraspecific competition, indicated by prey depletions near the colony increasing over time, and longer foraging trips. Methods: We used GPS and temperature-depth recorders to track the foraging movements of 221 chinstrap penguins from 4 sites at the South Orkney Islands during incubation and brood. We identified foraging dives and calculated the index of patch quality based on time allocation during the dive to assess the quality of the foraging patch. Results: We found that chinstrap penguin foraging distance varied between stages, and that trips became shorter as incubation progressed. Although patch quality was lower near the colony than at more distant foraging patches, patch quality near the colony improved over the breeding season. Conclusions: These results suggest chinstrap penguin foraging strategies are influenced by both breeding stage and prey distribution, and the low patch quality near the colony may ... |
format |
Article in Journal/Newspaper |
author |
Phillips, Jessica A. Fayet, Annette L. Guilford, Tim Manco, Fabrizio Warwick-Evans, Victoria Trathan, Philip N. |
spellingShingle |
Phillips, Jessica A. Fayet, Annette L. Guilford, Tim Manco, Fabrizio Warwick-Evans, Victoria Trathan, Philip N. Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
author_facet |
Phillips, Jessica A. Fayet, Annette L. Guilford, Tim Manco, Fabrizio Warwick-Evans, Victoria Trathan, Philip N. |
author_sort |
Phillips, Jessica A. |
title |
Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
title_short |
Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
title_full |
Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
title_fullStr |
Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
title_full_unstemmed |
Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
title_sort |
foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the south orkney islands |
publisher |
BioMed Central |
publishDate |
2021 |
url |
https://arro.anglia.ac.uk/id/eprint/706557/ https://arro.anglia.ac.uk/id/eprint/706557/6/Phillips_et_al_2021.pdf https://doi.org/10.1186/s40462-021-00261-x |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
South Orkney Islands |
geographic_facet |
South Orkney Islands |
genre |
Antarc* antarcticus Chinstrap penguin South Orkney Islands |
genre_facet |
Antarc* antarcticus Chinstrap penguin South Orkney Islands |
op_relation |
https://arro.anglia.ac.uk/id/eprint/706557/6/Phillips_et_al_2021.pdf Phillips, Jessica A., Fayet, Annette L., Guilford, Tim, Manco, Fabrizio, Warwick-Evans, Victoria and Trathan, Philip N. (2021) Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands. Movement Ecology, 9 (1). p. 22. ISSN 2051-3933 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1186/s40462-021-00261-x |
container_title |
Movement Ecology |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766270470596853760 |