Abstract # 13476 Event # 58:

Scheduled for Thursday, August 22, 2019 02:30 PM-02:45 PM: (Room 326) Oral Presentation


RATE OF EMISSION AND SOCIAL RELEVANCE OF NORTHERN MURIQUI (BRACHYTELES HYPOXANTHUS) SEQUENTIAL CALLS 

F. D. Mendes1,2, C. Ades2, D. Demolin3, C. T. Snowdon4 and K. B. Strier4
1Universidade de Brasília, Departamento de Processos Psicológicos Básicos, Brasilia, Distrito Federale 70910-900, USA, 2Universidade de São Paulo, 3Université Sorbonne Nouvelle, 4University of Wisconsin-Madison
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Data on the rate of emission and social context of muriqui sequential calls (SCs) are scarce, hindering the understanding of their usage and social relevance. We analyzed 667 focal samples (5 minutes each), conducted on members of the Caratinga population in Minas Gerais, Brazil. Data for each sample included records of vocalizations and non-vocal interactions (affiliative, reproductive, etc.) by the focal and other animals, as well as the overall activity (i.e., stationary/camping, scouting, traveling) and spacing (i.e., alone individual, small fission, cohesive, dispersed) of the group. SCs were the significantly (p<0.05) most frequent type of interaction of focal animals (vocal or not), occurring in 251 samples. Rates of calling of mature individuals varied from none (no SC as focal animal) to 15.4 calls/ hour (Mean+sd=7.2+4.1; n=619). Of SCs from focal animals, 81% were part of vocal exchanges that involved from 2 to 15 participants of variable sex-age combinations. SCs were neither temporally associated with non-vocal behaviors of callers or potential listeners, nor emitted when muriquis were “alone,” and occurred significantly less often when the group was stationary. The high rate and variety of social contexts of calling indicate that SCs are essential for intragroup coordination of spacing and movement. Further research is required to understand the informational content of SCs and their exact role in muriquis’ fission-fusion society.