Navegando por Assunto "Canto em dueto"

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Duetos na Amazônia: análise da sintaxe do canto em dueto do gênero Thryothorus (Aves, Troglodytidae)
(Universidade Federal do Pará, 2012-03-06) MONTE, Amanda de Almeida; SILVA, Maria Luisa da; http://lattes.cnpq.br/2101884291102108
In many duet-singing songbirds, paired birds combine their song types non randomly to form antiphonal duet songs. In Troglodytidae family (wrens and thrushes), 23 species have been reported to duet, Thryothorus genibarbis is a duet specie. The duet song carries the specie-specific information, however, its physical parameters (frequency and duration) varies among pairs and just the syntax, that means the notes sequence, is conserved. To investigate the syntax and physical parameters’ importance in coding the specie-specific information, playback experiments were conducted using modified duet song in syntax and frequency bandwidth with pairs at Gunma Ecological Park (Santa Bárbara city, Pará State) at Federal University of Pará (Belém city, Pará State). We search for evidence of a modulation pattern in song units of this specie, and investigate the similarities between the Thryothorus genibarbis song syntax and other seven same genera species. Our analysis of the modulation of the duet of this species revealed that was a modulation pattern in duet song units of different pairs. By comparing the similarity of duet song syntax between T. genibarbis and other species, we showed that T. genibarbis and T. leucotis, syntopic species, are most different than sympatric ones. We thus show experimentally that the duet syntax of T. genibarbis must be important to coordinate the duet song among pairs, but there is no specie-specific code in duet syntax, however, if we modify the frequency bandwidth more than 36% from original signal, the duet song could lose the specie-specific code.