Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands
Abstract 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 aroun...
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ftdoajarticles:oai:doaj.org/article:ea19b368770f47fab9b8a4545d3dffa6 2023-05-15T13:39:00+02:00 Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands Jessica Ann Phillips Annette L. Fayet Tim Guilford Fabrizio Manco Victoria Warwick-Evans Phil Trathan 2021-05-01T00:00:00Z https://doi.org/10.1186/s40462-021-00261-x https://doaj.org/article/ea19b368770f47fab9b8a4545d3dffa6 EN eng BMC https://doi.org/10.1186/s40462-021-00261-x https://doaj.org/toc/2051-3933 doi:10.1186/s40462-021-00261-x 2051-3933 https://doaj.org/article/ea19b368770f47fab9b8a4545d3dffa6 Movement Ecology, Vol 9, Iss 1, Pp 1-14 (2021) Chinstrap penguin Seabird Foraging Habitat selection Index of patch quality Prey availability Biology (General) QH301-705.5 article 2021 ftdoajarticles https://doi.org/10.1186/s40462-021-00261-x 2022-12-31T12:00:36Z Abstract 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 ... Article in Journal/Newspaper Antarc* antarcticus Chinstrap penguin South Orkney Islands Directory of Open Access Journals: DOAJ Articles South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Movement Ecology 9 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Chinstrap penguin Seabird Foraging Habitat selection Index of patch quality Prey availability Biology (General) QH301-705.5 |
spellingShingle |
Chinstrap penguin Seabird Foraging Habitat selection Index of patch quality Prey availability Biology (General) QH301-705.5 Jessica Ann Phillips Annette L. Fayet Tim Guilford Fabrizio Manco Victoria Warwick-Evans Phil Trathan Foraging conditions for breeding penguins improve with distance from colony and progression of the breeding season at the South Orkney Islands |
topic_facet |
Chinstrap penguin Seabird Foraging Habitat selection Index of patch quality Prey availability Biology (General) QH301-705.5 |
description |
Abstract 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 ... |
format |
Article in Journal/Newspaper |
author |
Jessica Ann Phillips Annette L. Fayet Tim Guilford Fabrizio Manco Victoria Warwick-Evans Phil Trathan |
author_facet |
Jessica Ann Phillips Annette L. Fayet Tim Guilford Fabrizio Manco Victoria Warwick-Evans Phil Trathan |
author_sort |
Jessica Ann Phillips |
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 |
BMC |
publishDate |
2021 |
url |
https://doi.org/10.1186/s40462-021-00261-x https://doaj.org/article/ea19b368770f47fab9b8a4545d3dffa6 |
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_source |
Movement Ecology, Vol 9, Iss 1, Pp 1-14 (2021) |
op_relation |
https://doi.org/10.1186/s40462-021-00261-x https://doaj.org/toc/2051-3933 doi:10.1186/s40462-021-00261-x 2051-3933 https://doaj.org/article/ea19b368770f47fab9b8a4545d3dffa6 |
op_doi |
https://doi.org/10.1186/s40462-021-00261-x |
container_title |
Movement Ecology |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766113769966010368 |