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Silveira-Martins, Debora. (2015). BIOACOUSTICS AND WELFARE IN CAPTIVITY: ROARS OF Alouatta caraya (Primates, Atelidae ) AS ENVIRONMENTAL ENRICHMENT ELEMENT. Master Dissertation Faculdade de Filosofia Ciencias e Letras de Ribeirao Preto, Universidade de Sao Paulo, Sao Paulo. The Bioacoustics offers useful tools for diverse academic, scientific and applied sciences and practices in use and conservation of animal life. We hypothesized that natural call, as the loud roar of the black-howler monkey, would act as environmental enrichment element if its execution increased the display of natural behavior in captivity. The howler-monkey makes an everyday use of the roar and its emission is known to evoke free-living howler-monkeys to call back in response. To test the effectiveness of roars in improving welfare we conducted an experiment in Bosque e Zoologico Fabio Barreto, in the municipality of Ribeirao Preto where thirteen individuals (6 females and 7 males) were living in five adjacent enclosures. They had visual and acoustic contact between them and with two other primate species and a free-living black-howler monkey group. We adopted the ABABA experimental design, in which control phases A were interspersed with treatment (roar playback) phases B, two times a day (morning and afternoon). In the first B phase, the stimulus was always played at the same time (predictable) and, in the other different random schedules were adopted (unpredictable). We evaluate changes in relative duration of 6 behaviors from A to B phases, between sex and in both periods with a repetitive factorial ANOVA. We reported increase in natural behavior of the species in treatment phases, as alert, oriented attention, and social interactions, coupled with the decrease of stereotyped behaviors, suggesting welfare improvement. Thus, natural emissions of roars also increased. We concluded that both predictable and unpredictable routines improved welfare and we propose the use of playback of specie-specific calls as a new category of environmental enrichment. The answer of the other primates led us to conclude that there was a neighborhood effect that can be beneficial or harmful according to the species and the psychological condition of the animals.

Bioacústica e bem-estar em cativeiro: rugidos de Alouatta caraya (Primates, Atelidae) como elemento de enriquecimento ambiental