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Foraging behaviour of Razorbills Alca torda during chick-rearing at the largest colony in the Baltic Sea
Stockholm University, Faculty of Science, Stockholm Resilience Centre.
Number of Authors: 42019 (English)In: Bird Study, ISSN 0006-3657, E-ISSN 1944-6705, Vol. 66, no 1, p. 11-21Article in journal (Refereed) Published
Abstract [en]

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 Karlso, 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.

Place, publisher, year, edition, pages
2019. Vol. 66, no 1, p. 11-21
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-172079DOI: 10.1080/00063657.2018.1563044ISI: 000479100000002OAI: oai:DiVA.org:su-172079DiVA, id: diva2:1344767
Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-08-22Bibliographically approved

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