title: Vocalisations of wild common marmosets are influenced by diurnal and ontogenetic factors.
abstract: The vocalisations of wild common marmosets, Callithrix jacchus, were recorded to investigate whether call rate by individuals is affected by time of day, age, sex or dominance rank within a group. We also investigated how vocalisation pitch was affected by age, focussing on a single common call, the trill call. Adults vocalised more than juveniles or infants during the majority of daylight hours. Only the call rate of juveniles varied significantly over the day. No differences were found between either sex or dominance rank with respect to rate of vocalisations. The trill calls emitted by young wild common marmosets were of a higher pitch than those emitted by adults. We conclude that the auditory communication of wild common marmosets is related to the age of the animals, both in terms of call rate and the physical characteristics of their vocalisations.
authors.affiliation: Bat Ecology and Bioacoustics Laboratory, School of Biological Sciences, University of Bristol, Woodland Road, BS8 1UG, Bristol, UK. bruna.bezerra@bristol.ac.uk
authors.forename: Bruna Martins
authors.initials: BM
authors.lastname: Bezerra
authors.forename: Antonio da Silva
authors.initials: Ada S
authors.lastname: Souto
authors.forename: Maria Adélia Borstelmann
authors.initials: MA
authors.lastname: de Oliveira
authors.forename: Lewis George
authors.initials: LG
authors.lastname: Halsey
mesh_terms: D000367:Age Factors; D000818:Animals; D001938:Brazil; D002144:Callithrix / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006608:Hierarchy, Social; D008297:Male; D012737:Sex Factors; D013018:Sound Spectrography; D014828:Vocalization, Animal / Q000502:physiology*