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Phonotactic approach pattern in the neotropical frog Allobates femoralis: A spatial and temporal analysis

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Phonotactic approaches by 17 male Allobates femoralis were videotaped and analysed in terms of spatial and temporal patterns to assess this species' ability to localise sound. Jump angles of consecutive jumps and the straightness of paths were measured to quantify the accuracy of approach. The effect of interbout intervals on phonotactic approach was examined by comparing movement parameters of two tests, using a standard call with interbout intervals, and a continuous call without interbout intervals. Phonotactic approach occurred almost exclusively during calling bouts. Interbout intervals interrupted movement and did not alter the accuracy of approach. Our results suggest that only the calling bouts, but not the silent interbout intervals, play a crucial role for male phonotaxis in this species. Furthermore, anuran phonotactic approach is not strictly axis-alternated and, thus, not appropriately described by the generally used term 'zig-zagging'.

Affiliations: 1: Department of Evolutionary Biology, University of Vienna, Althanstraße 14, A-1090 Vienna, Austria


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