Journal
IBIS
Volume 156, Issue 4, Pages 892-895Publisher
WILEY
DOI: 10.1111/ibi.12178
Keywords
calls; individual quality; vocal display
Categories
Funding
- Spanish Ministry of Economy and Competitiveness [CGL2012-33240]
- Spanish Ministry of Economy and Competitiveness (FEDER)
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Dawn and dusk choruses represent one of the most investigated topics in avian vocal behaviour, but their underlying basis remains unclear. As with the dawn chorus in passerines, dusk chorus in owls seems to support the mate and rival assessment hypothesis and happens during the most constraining period, as individuals have not yet fed and, under the handicap principle, dusk chorus is likely to reveal inter-individual differences in competitive ability, body condition and/or habitat quality. Here, a study of vocal displays at dusk of 14 Eurasian Eagle Owls Bubo bubo revealed a temporal succession in the order in which males began their vocalizations. The vocalization order appeared to be related to both the quality of the nesting territory (based upon mean number of fledged young and proportion of rats in the diet) and the male's individual quality, as revealed by haematocrit values and the brightness of the white throat patch.
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