Acoustic communication between mates in White-Throated Dippers, Cinclus cinclus
Résumé
In the vast majority of songbirds, females and males form monogamous pairs and coordinate their behaviours during the breeding season. In some species, a better behavioural coordination between partners improves the reproductive success and acoustic communication is likely to drive partners’ adjustments. Birdsong has been extensively studied as an important signal during the reproductive period (mate attraction, territory defence). But if males were particularly studied in temperate zones, female vocalisations and interactive communication between partners have been neglected. White throated dippers (Cinclus cinclus) are monogamous and both sexes have been reported to sing during pair formation. However interactive communication between partners after this phase has never been studied. We followed breeding in a wild population of white-throated dippers (Massif de la Charteuse, France). We recorded behaviour and interactive communication at the nest during two key periods: incubation and chicks’ rearing. For the time in this species, we described vocal signals produced at the nest by both partners. Using semi-manual and automated acoustic analyses we sought for acoustic proxies of female-male vocal signals structure. We hypothesised that some aspects of female-male vocal signals predict partners’ behaviour during parental care, especially female incubation behaviour. To go further, we would test relationships between partners’ communication and reproductive success.