No need to shout: Effect of signal loudness on sibling communication in barn owls Tyto alba

Détails

ID Serval
serval:BIB_729D85F5EE6C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
No need to shout: Effect of signal loudness on sibling communication in barn owls Tyto alba
Périodique
Ethology
Auteur(s)
Dreiss A.N., Ducouret P., Ruppli C.A., Rossier V., Hernandez L., Falourd X., Marmaroli P., Cazau D., Lissek H., Roulin Al.
ISSN
1439-0310
ISSN-L
0179-1613
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
123
Numéro
6-7
Pages
419-424
Langue
anglais
Résumé
In animal communication, signal loudness is often ignored and seldom measured. We used a playback experiment to examine the role of vocal loudness (i.e., sound pressure level) in sibling to sibling communication of nestling barn owls Tyto alba. In this species, siblings vocally negotiate among each other for priority access to parental food resources. Call rate and call duration play key roles in this vocal communication system, with the most vocal nestlings deterring their siblings from competing for access to the food item next delivered by parents. Here, we broadcast calls at different loudness levels and call rate to live nestlings. The loudness of playback calls did not affect owlets' investment in call rate, call duration or call loudness. The rate at which playback calls were broadcast affected owlets' call rate but did not influence their response in terms of loudness. This suggests that selection for producing loud signals may be weak in this species, as loud calls may attract predators. Moreover, given that owlets do not overlap their calls and that they communicate to nearby siblings in the silence of the night, loud signals may not be necessary to convey reliable information about food need.
Mots-clé
acoustics, amplitude, begging, communication, competition, multiple signals, negotiation, playback
Web of science
Création de la notice
07/07/2017 9:14
Dernière modification de la notice
20/08/2019 14:30
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