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| Author(s): |
Luiz Carlos Matos Biondi
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Psicologia (IP/SBD) |
| Defense date: | 2010-12-15 |
| Examining board members: |
Patricia Izar Mauro;
Briseida Dogo de Resende;
Michele Pereira Verderane
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| Advisor: | Patricia Izar Mauro |
| Abstract | |
The genus Cebus is a taxon that groups arboreal species in which the main locomotor mode is quadrupedal locomotion and the main posture mode is sitting down. However, all the studies reviewed describe positional behavior of rainforest inhabitating populations, an environment to which the genus is not restricted. The aims of this study were (1) to describe the behavior of a population of Cebus libidinosus that uses exclusively an ecotone Cerrado-Caatinga and (2) to check if individuals of different gender and age classes differ in their positional behaviors, since changes that accompany growing individuals influence their daily activities. I used the focal scan method to collect behavioral data and Poisson regression for the statistical analysis. The positional behavior, substrate use and the use of arboreal substrates were investigated by activity, since these require different placements. The age groups differed significantly in the frequency of feeding, play and rest activities. In most activities the age groups differed significantly in the frequency of use of positional behaviors such as climbing, quadrupedal locomotion, suspension, among others, suggesting their ontogenetic development requires animals to model their locomotor and postural modes depending on environmental characteristics and anatomical and physiological differences. As for the substrates used, the trees were always the favorites (except for the nutcrack activity, conducted exclusively on the ground) and multiple branches were more frequently used in most of the activities. Infants used multiple branches more and large single branches less than adults during travel. Older individuals used terrestrial environments more often than younger ones during play and travel. In the activities that the available literature allowed comparisons, the Cebus libidinosus of this study use terrestrial substrates more than other species of the genus, although they present similar positional behavior and activity budget (AU) | |