Vocal interactions between pairs of Sumatran laughingthrushes (Garrulax bicolor) – April 2013

By AnaïsTritto

anais.tritto@hotmail.fr

Anais Tritto

Anais Tritto

This vocalization study tries to determine the frequency of calls made by pairs of Sumatran laughingthrushes at Cikananga Conservation Breeding Centre. As this species is quite sensitive and seems to be territorial, it is worth knowing if several pairs housed in the same building can have deleterious effect on their welfare and on the breeding success. In the centre, two buildings house one pair of this species, two other buildings house two pairs and one building houses three pairs and two single males. After recording and analysing the frequency of calls in each building (the female call, the male calls and when they are duetting), we can conclude that the calls seem to be linked with the number of pairs housed in a building but mainly with the life history of each pairs. Firstly, if a pair is recently created, the number of duet is higher in frequency to create pair-bond and warn potential rivals of their mate status. Secondly, the number of vocalizations can be linked with a recent settlement inside a building. Male calls are frequent for a pair that just arrived in a building. These calls are loud and directed to outsiders to affirm the male territory and its position as mate. But these calls decrease along the days until a reasonable level which can be linked with an adaptation of the pair to the new environment and neighbours. Finally, the breeding condition has the opposite impact on the number of vocalizations as pairs which are sitting on the nest or rearing chicks will be quiet to avoid predators to discover the nest and thus, compromise the breeding success

A pair of Sumatran Laughing Thrushes (Garrulax bicolor)

A pair of Sumatran Laughingthrush (Garrulax bicolor)

Posted in CCBC.