Navegando por Assunto "Reconhecimento específico"

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Acesso aberto (Open Access)
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.
Acesso aberto (Open Access)
Estrutura e organização de sistemas complexos de comportamento vocal em cinco espécies do Gênero Turdus (Aves, Passeriformes, Turdinae)
(Universidade Federal do Pará, 2012-03-07) NASCIMENTO, Luis Fernando Teixeira; SILVA, Maria Luisa da; http://lattes.cnpq.br/2101884291102108
Communication is essential for animal life maintenance. In birds prevails acoustic communication, the song is the sound emission that has the specific recognition function, can be repetitive and predictable or complex with variations levels between individuals conspecifics. The genus Turdus provides members with a melodious and varied song, as is the case of five syntopic species in Brazil (T. leucomelas, T. rufiventris, T. fumigatus, T. amaurochalinus and T. albicollis), the high variation level may to cause recognition confusion of these species among experienced researchers and lovers in the listening birds practice. The structure analysis and complex organization of communication systems can give us answers to their functionality. In present study we gathered recordings of 72 individuals of five species above mentioned, from various localities, identified and named each of the 4826 notes, the song units of sound, and we measure their physical parameters. Through mathematical tools based on the theory of information verified the individual predictability of the corner and use as a criterion for comparison between individuals and species. We analyzed the data, sketched sequences and synthesized the results of cluster analysis to define the structure and organization of the song. The analyzes showed similarity in the song complexity of species compared some specific patterns were observed, such as T. amaurochalinus showed the highest values of the rhythm of the song and the maximum frequency of the notes, T. albicollis stood out by low values of these parameters, as for T. leucomelas, T. rufiventris and T. fumigatus was not observed characteristics, the three species show great variation in the parameters analyzed. But the evolutionary success of these species makes it clear that their songs are successful to exercise the functions of communication and specific recognition.