La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Patterns of dawn singing by Buff-breasted Flycatchers
Auteurs :	M. Ross Lein, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (78(4) DEC 2007)
Article en page(s) :	343-351
Langues:	Anglais
Résumé :	Many passerine species exhibit a "dawn chorus"-a bout of intense singing activity before or at dawn, but our understanding of this phenomenon is poor. Tyrant flycatchers (Tyrannidae) exhibit pronounced daily bouts of dawn singing. I documented this behavior in several populations of Buff-breasted Flycatchers (Empidonax fulvifrons) in Arizona, tape recording > 30,000 songs of 23 individuals during dawn singing. Individual males sang a dawn bout each morning, even during breeding phases when daytime song was almost completely absent. Dawn bouts began 5-10 min before local civil twilight and continued for 25-30 min. Each male possessed two song types delivered at high rates during dawn singing (four times the rate during sustained daytime singing). Song rate varied significantly over the course of dawn bouts, increasing to

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