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Owl dusk chorus is related to the quality of individuals and nest-sites
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Orientador(es)
Resumo(s)
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.
Descrição
Palavras-chave
Calls Individual quality Vocal display
Contexto Educativo
Citação
IBIS, 156, 892-895
Editora
Wiley-Blackwell