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Habitat-specific demography in a social, territorial bird species
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Ecology and Evolution.
Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-94428OAI: oai:DiVA.org:uu-94428DiVA: diva2:168269
Available from: 2006-04-20 Created: 2006-04-20 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Effects of Habitat Quality on Behavioural Decisions and Population Dynamics in the Siberian Jay
Open this publication in new window or tab >>Effects of Habitat Quality on Behavioural Decisions and Population Dynamics in the Siberian Jay
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The dynamics of natural populations may be influenced by a variety of factors, ranging from feeding interference and territoriality to the risk of predation and climatic effects. The relative influence of these factors may be contingent upon the quality of the habitat in which individuals reside. A factor that can largely affect population dynamics and that often covaries with habitat structure is predation risk. However, the combined effect of habitat and predation risk can vary according to the social context and intrinsic characteristics that affect individual behavioural responses. This thesis investigates the effects of habitat quality at the level of the population and the individual, and examines how it relates to the above factors in Siberian jays (Perisoreus infaustus), a territorial, group-living species in which the main cause of mortality is predation. The results demonstrate a strong effect of habitat on survival, reproduction and behaviour. Mortality was generally higher in open areas and managed forests and reproductive success decreased after forest management. Breeding females were more sensitive to environmental factors than males, possibly because of higher reproductive costs. Estimates of spatial demography suggested that there were more sinks than sources, and that they were located in open, managed forests. Behavioural decisions confirmed that open forests were associated with higher predation risks. However, decisions depended on social context; immigrants took highest risks and were the recipients of most aggression, largely an effect of social subordination. Also, parents provide their offspring with benefits that are withheld from immigrants. As a result, first-year survival was higher in retained offspring. Investigating the effects of multi-scale habitat quality on individual behaviour and population dynamics has generated an increased understanding of the effects of forest management on the dynamics of this population. This approach should facilitate development of an effective conservation management policy for this species.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 45 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 174
Biology, Perisoreus infaustus, relatedness, delayed dispersal, predation risk, foraging, trade-off, demography, source-sink dynamics, forest structure, Biologi
urn:nbn:se:uu:diva-6835 (URN)91-554-6553-6 (ISBN)
Public defence
2006-05-12, Zootissalen, Evolutionary Biology Centre, Norbyvägen 9, Uppsala, 10:00 (English)
Available from: 2006-04-20 Created: 2006-04-20 Last updated: 2010-03-16Bibliographically approved

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