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Influence of Winter Ranging Behaviour on the Social Organization of a Cooperatively Breeding Bird Species, The Apostlebird
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
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2009 (English)In: Ethology, ISSN 0179-1613, E-ISSN 1439-0310, Vol. 115, no 9, 888-896 p.Article in journal (Refereed) Published
Abstract [en]

Most cooperative breeding bird species live in family groups that are formed through the prolonged association of offspring with their parents. Research into cooperative families has in particular investigated the balance between cooperation and conflict over reproductive decisions. As a consequence of this research focus, social interactions among group members outside the breeding season are rarely studied, despite the fact that they are likely to be crucial for social decisions. We investigated the social dynamics and ranging behaviour of the family group living cooperatively breeding apostlebird (Struthidea cinerea) outside the breeding season. Group size changed between, but not within, the seasons, being smaller during the breeding season than in the winter season. This change in group size was a consequence of breeding groups merging after breeding, then splitting again before the next breeding season. While breeding groups used small, non-overlapping home ranges (x = 113 ha) around the nesting site, during winter groups moved up to 1200 ha (x = 598 ha), and interacted frequently with up to four other winter groups. In particular large groups often joined together during winter and spent up to 50% of their time associating with other large winter groups. This apparent fission-fusion system facilitated the exchange of group members, offering the possibility to form new breeding coalitions and new groups. The results of this study suggest that behaviour outside the breeding season can be of considerable importance to the social dynamics of both families and cooperative breeding in such systems.

Place, publisher, year, edition, pages
2009. Vol. 115, no 9, 888-896 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-128316DOI: 10.1111/j.1439-0310.2009.01678.xISI: 000268925400010OAI: oai:DiVA.org:uu-128316DiVA: diva2:331259
Available from: 2010-07-22 Created: 2010-07-20 Last updated: 2017-12-12Bibliographically approved

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