Acoustic cues to caller identity in lemurs: a case study |
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Authors: | Marco Gamba Camilla Colombo Cristina Giacoma |
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Institution: | (1) Department of Animal and Human Biology, University of Torino, Via Accademia Albertina 13, 10123 Turin, Italy |
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Abstract: | This study investigated the acoustic structure of grunt vocalizations in red-bellied lemurs (Eulemur rubriventer) and its potential for individual discrimination. Acoustic analyses were performed on 1,605 grunts recorded from seven lemurs
belonging to two captive groups. From the perspective of sound-filter theory, we described the acoustic structure of grunts,
measuring two sets of parameters: fundamental frequency characteristics as larynx-related variables and four formant frequencies
as filter-related features. Formants were effective in assigning 80.5% of the vocalizations to the correct emitter against
24.9% scored by the model based on larynx-related variables. We concluded that vocal tract resonances might potentially provide
conspecifics with individual cues. |
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