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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Online Access: | https://pure.uhi.ac.uk/en/publications/5d964545-f5e4-4ff5-ba50-cba2d02ebcaf https://doi.org/10.1080/00063657.2018.1563044 http://www.scopus.com/inward/record.url?scp=85060832091&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85060832091&partnerID=8YFLogxK |
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ftuhipublicatio:oai:pure.atira.dk:publications/5d964545-f5e4-4ff5-ba50-cba2d02ebcaf 2024-04-28T07:53:46+00:00 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://pure.uhi.ac.uk/en/publications/5d964545-f5e4-4ff5-ba50-cba2d02ebcaf https://doi.org/10.1080/00063657.2018.1563044 http://www.scopus.com/inward/record.url?scp=85060832091&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85060832091&partnerID=8YFLogxK eng eng https://pure.uhi.ac.uk/en/publications/5d964545-f5e4-4ff5-ba50-cba2d02ebcaf info:eu-repo/semantics/closedAccess Isaksson , N , Evans , T J , Olsson , O & Åkesson , S 2019 , ' Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea ' , Bird Study , vol. 66 , no. 1 , pp. 11-21 . https://doi.org/10.1080/00063657.2018.1563044 article 2019 ftuhipublicatio https://doi.org/10.1080/00063657.2018.1563044 2024-04-11T00:05:55Z 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 University of the Highlands and Islands: Research Database of UHI Bird Study 66 1 11 21 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
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 |
spellingShingle |
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 |
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 |
publishDate |
2019 |
url |
https://pure.uhi.ac.uk/en/publications/5d964545-f5e4-4ff5-ba50-cba2d02ebcaf https://doi.org/10.1080/00063657.2018.1563044 http://www.scopus.com/inward/record.url?scp=85060832091&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85060832091&partnerID=8YFLogxK |
genre |
Alca torda common guillemot Razorbill Uria aalge uria |
genre_facet |
Alca torda common guillemot Razorbill Uria aalge uria |
op_source |
Isaksson , N , Evans , T J , Olsson , O & Åkesson , S 2019 , ' Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea ' , Bird Study , vol. 66 , no. 1 , pp. 11-21 . https://doi.org/10.1080/00063657.2018.1563044 |
op_relation |
https://pure.uhi.ac.uk/en/publications/5d964545-f5e4-4ff5-ba50-cba2d02ebcaf |
op_rights |
info:eu-repo/semantics/closedAccess |
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 |
_version_ |
1797573238265479168 |