Vocalisations of wild common marmosets are influenced by diurnal and ontogenetic factors |
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Authors: | Bruna Martins Bezerra Antonio da Silva Souto Maria Adélia Borstelmann de Oliveira Lewis George Halsey |
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Institution: | (1) Bat Ecology and Bioacoustics Laboratory, School of Biological Sciences, University of Bristol, Woodland Road, BS8 1UG Bristol, UK;(2) Departamento de Zoologia, Universidade Federal de Pernambuco, Recife, Brazil;(3) área de Fisiologia, Universidade Federal Rural de Pernambuco, Recife, Brazil;(4) School of Human and Life Sciences, Roehampton University, London, UK |
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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. |
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Keywords: | Age-related variations Rate of vocalisations Daily time variation Call characteristics Vocal communication |
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