Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea
Capsule: Foraging behaviour in the Razorbill Alca torda during breeding was similar to that found elsewhere, aside from dive shape. Aims: To investigate the foraging behaviour of Razorbills during the breeding season at the largest colony in the central Baltic Sea. Methods: A combination of global p...
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British Trust for Ornithology
2019
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Online Access: | https://lup.lub.lu.se/record/14fa927f-d891-4a13-bfa5-1c4c2ace229c https://doi.org/10.1080/00063657.2018.1563044 |
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ftulundlup:oai:lup.lub.lu.se:14fa927f-d891-4a13-bfa5-1c4c2ace229c 2023-05-15T13:12:13+02:00 Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea Isaksson, Natalie Evans, Tom J. Olsson, Olof Åkesson, Susanne 2019-01-28 https://lup.lub.lu.se/record/14fa927f-d891-4a13-bfa5-1c4c2ace229c https://doi.org/10.1080/00063657.2018.1563044 eng eng British Trust for Ornithology https://lup.lub.lu.se/record/14fa927f-d891-4a13-bfa5-1c4c2ace229c http://dx.doi.org/10.1080/00063657.2018.1563044 scopus:85060832091 Bird Study; 66(1), pp 11-21 (2019) ISSN: 0006-3657 Zoology contributiontojournal/article info:eu-repo/semantics/article text 2019 ftulundlup https://doi.org/10.1080/00063657.2018.1563044 2023-02-01T23:37:29Z Capsule: Foraging behaviour in the Razorbill Alca torda during breeding was similar to that found elsewhere, aside from dive shape. Aims: To investigate the foraging behaviour of Razorbills during the breeding season at the largest colony in the central Baltic Sea. Methods: A combination of global positioning system (GPS) and time-depth recorder (TDR) devices were used on Razorbills breeding on the island of Stora Karlsö, Baltic Sea, during the chick-rearing period. Results: Five GPS tracks and nine TDR logs were retrieved from 12 Razorbills, and 7399 dives were analysed. Razorbills foraged south and southwest of the colony. Maximum and mean (±sd) foraging range from the colony was 72.7 km and 13.1 ± 13.5 km, respectively. Mean dive depth (15.3 ± 2.4 m) and duration (53.1 ± 8.5 s) were similar to those of a more southern Baltic Sea Razorbill colony. Dive depth had a bimodal distribution, with 70% of dives deeper than 10 m and 30% shallower than 10 m. There was a clear diel foraging pattern with 89% of dives occurring during daytime and a higher proportion of shallow dives at night. Unexpectedly, dives were primarily U-shaped. The Razorbills spent 31% of their overall time activity budget flying or diving. Conclusion: Aside from dive shape, foraging behaviour was consistent with that reported at other colonies of Razorbills. Inconsistency in dive shape may be due to a bimodal foraging strategy, local prey behaviour or competition with the Common Guillemot Uria aalge. Article in Journal/Newspaper Alca torda common guillemot Razorbill Uria aalge uria Lund University Publications (LUP) Bird Study 66 1 11 21 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Zoology |
spellingShingle |
Zoology Isaksson, Natalie Evans, Tom J. Olsson, Olof Åkesson, Susanne Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea |
topic_facet |
Zoology |
description |
Capsule: Foraging behaviour in the Razorbill Alca torda during breeding was similar to that found elsewhere, aside from dive shape. Aims: To investigate the foraging behaviour of Razorbills during the breeding season at the largest colony in the central Baltic Sea. Methods: A combination of global positioning system (GPS) and time-depth recorder (TDR) devices were used on Razorbills breeding on the island of Stora Karlsö, Baltic Sea, during the chick-rearing period. Results: Five GPS tracks and nine TDR logs were retrieved from 12 Razorbills, and 7399 dives were analysed. Razorbills foraged south and southwest of the colony. Maximum and mean (±sd) foraging range from the colony was 72.7 km and 13.1 ± 13.5 km, respectively. Mean dive depth (15.3 ± 2.4 m) and duration (53.1 ± 8.5 s) were similar to those of a more southern Baltic Sea Razorbill colony. Dive depth had a bimodal distribution, with 70% of dives deeper than 10 m and 30% shallower than 10 m. There was a clear diel foraging pattern with 89% of dives occurring during daytime and a higher proportion of shallow dives at night. Unexpectedly, dives were primarily U-shaped. The Razorbills spent 31% of their overall time activity budget flying or diving. Conclusion: Aside from dive shape, foraging behaviour was consistent with that reported at other colonies of Razorbills. Inconsistency in dive shape may be due to a bimodal foraging strategy, local prey behaviour or competition with the Common Guillemot Uria aalge. |
format |
Article in Journal/Newspaper |
author |
Isaksson, Natalie Evans, Tom J. Olsson, Olof Åkesson, Susanne |
author_facet |
Isaksson, Natalie Evans, Tom J. Olsson, Olof Åkesson, Susanne |
author_sort |
Isaksson, Natalie |
title |
Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea |
title_short |
Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea |
title_full |
Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea |
title_fullStr |
Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea |
title_full_unstemmed |
Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea |
title_sort |
foraging behaviour of razorbills alca torda during chick-rearing at the largest colony in the baltic sea |
publisher |
British Trust for Ornithology |
publishDate |
2019 |
url |
https://lup.lub.lu.se/record/14fa927f-d891-4a13-bfa5-1c4c2ace229c https://doi.org/10.1080/00063657.2018.1563044 |
genre |
Alca torda common guillemot Razorbill Uria aalge uria |
genre_facet |
Alca torda common guillemot Razorbill Uria aalge uria |
op_source |
Bird Study; 66(1), pp 11-21 (2019) ISSN: 0006-3657 |
op_relation |
https://lup.lub.lu.se/record/14fa927f-d891-4a13-bfa5-1c4c2ace229c http://dx.doi.org/10.1080/00063657.2018.1563044 scopus:85060832091 |
op_doi |
https://doi.org/10.1080/00063657.2018.1563044 |
container_title |
Bird Study |
container_volume |
66 |
container_issue |
1 |
container_start_page |
11 |
op_container_end_page |
21 |
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1766250860442025984 |