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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	African parrot vocalizations and their functional significance
Auteurs :	V. Venuto, Auteur ; R. Massa, Auteur ; L. Bottoni, Auteur
Type de document :	Article
Dans :	Ostrich (No number JUL 2001)
Article en page(s) :	224-228
Langues:	Anglais
Résumé :	Parrot vocalisation is a very complex bioacoustic subject even to those biologists who are familiar with songbird analysis. This appears to be related to the great semantic complexity of vocal communication of these birds. Therefore,the detailed description of vocalisations appears to be crucial for future analysis of Parrot communication. Since 1993, we started to investigate different aspects of both learned and innate vocalisations of African Poicephalus Parrots. In this paper, we review these studies to summarise the following findings potentially useful to the study of Parrot communication: (i) Duets: in the Red-fronted Parrot Poicephalus gulielmi, the complexity of the duet is a function of the stability of the pair bond; the song convergence increases with the length of time that the pair has previously spent together and duet complexity is learned and refined over time; (ii) Identification motif we studied the nest interactions between parents and chicks in Meyer's Parrot (Poicephalus meyeri). We found that identification motifs are developed which are peculiar to an individual and function as a way of identifying the individual to its family group; (iii) Food begging call: we describe the ontogeny and possible fate of food begging calls in 5 species of Poicephalus Parrots. This call has a pulsing structure and the number of pulses is reduced with time. The final outcome of the develop-mental process from the innate food begging call seems to be the learned contact call of adults; (iv) Distress call: the distress call of African Poicephalus Parrots is a sexually dimorphic vocalisation, with significant differences in the main physical parameters of the two sexes of all the species studied. We also found significant differences between species and superspecies even though this vocalisation is extremely conservative.

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