Advertisement call propagation and species recognition in anurans: in time and space / Propagação e reconhecimento específico do canto de anúncio de anuros: no tempo e no espaço

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

07/05/2012

RESUMO

This study evaluates the influence of the vegetation structure on the advertisement call propagation and the evolution of acoustic communication in anurans. The first chapter reviews the literature on the effects of vegetation in the advertisement-call transmission, addressing directly or not, the Acoustic Adaptation Hypothesis. The studies found were analyzed in detail and, the importance of improving the experimental design by increasing the number of sampling units, controlling for phylogeny and body size and, using a quantitative measure of the vegetation structure was highlighted. The second chapter tests the influence of vegetation, background noise and, morphology in the evolution of the advertisement calls, with the Hylidae family as the study model. We compared the results obtained by traditional statistical, which does not incorporate information on phylogeny into the analyses, and different analyses of the comparative method, performed on two phylogenetic hypotheses. All the results pointed to an adaptive model of evolution, suggesting stabilizing selection or strong directional evolution, with one or two adaptive peaks, as good models for the advertisement call evolution considering the tested environmental traits. Displacement in dominant frequency in noisy environments was not found. The evolution in dominant frequency is related to the evolution in body size. Local pressures can promote geographic variation in advertisement calls and in call recognition among populations of the same species or between phylogenetically related species. Therefore, the third chapter tests the ability of Allobates femoralis and Allobates hodli males to recognize conspecifics and heteroespecíficos calls, with wide geographical variation in number of notes. Cross-playback experiments were performed between sympatric populations of A. femoralis (four-note calls) and A. hodli (two- note calls) and, playback experiments were performed in another population of A. femoralis (four-note calls), where were broadcasted stimuli of allopatric populations of A. hodli (two- note calls), A. femoralis (three-note calls) and A. myersi (six-note calls). Males of A. femoralis from both populations (sympatric and allopatric) and A. hodli showed similar phonotatic response to all stimuli, indicating that evolutionary rates of advertisement call design and call perception are different, since the male s aggressive behavior did not follow the geographical variation in calls.

ASSUNTO(S)

evolução bioacústica herpetologia zoologia

ACESSO AO ARTIGO

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