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Behaviour and survival of Common Guillemot Uria aalge chicks at departure from a nest site in the Baltic Sea
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2012 (English)In: Ornis Svecica, ISSN 1102-6812, Vol. 22Article in journal (Refereed) Published
Abstract [en]

Common Guillemots Uria aalge often breed high up in cliffs, forcing the juveniles to jump down to the beach or sea sea when leaving their nests. We studied survival of Common Guillemot chicks at time of nest departure on the island Lilla Karlsö in the Baltic Sea. All jumps were conducted either together with one of the parents, or, more commonly, the parent few down shortly before the chick jumped. At this point, the parent was always found waiting for the chick directly underneath the nest, either on the beach or in the water, and never farther out than fve meters if there was no beach below the cliff. If separated, all observed parents and juveniles reunited within one minute and then swam close together out to sea. Juvenile mortality was very low, only 0.5% in 2011, with 2 of 426 chicks dying. In both cases hitting a lower cliff ledge caused the mortality. No case of predation was observed. The high survival rates are most likely due to the chicks’ close proximity to their male parent at all times.

Place, publisher, year, edition, pages
2012. Vol. 22
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Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-284843OAI: oai:DiVA.org:uu-284843DiVA: diva2:920864
Available from: 2016-04-19 Created: 2016-04-19 Last updated: 2017-11-30

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