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Animal research commonly requires temporary handling of study animals. In this study, we compared the response to handling stress in urban and forest Great Tits (Parus major). We measured breath rate, which has been suggested as a proxy of the stress response of the bird. Urban birds displayed higher breath rates than forest birds. Results suggest that the(More)
The analysis of diet specialization provides key information on how different individuals deal with similar food and habitat constraints within populations. Characterizing parental diet specialization at the moment of breeding, and the consistency of these preferences under different levels of effort, may help us to understand why parents exploit(More)
Behavioural research traditionally focusses on the mean responses of a group of individuals rather than variation in behaviour around the mean or among individuals. However, examining the variation in behaviour among and within individuals may also yield important insights into the evolution and maintenance of behaviour. Repeatability is the most commonly(More)
Two main theories attempt to explain species coexistence: the neutral theory considers all the species as equivalents so biodiversity is mainly regarded as a function of total available resources (i.e. niche expansion), while the niche theory stresses the relevance of differences in niche use between species (i.e. niche packing). The relative importance of(More)
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