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| Author(s): |
Liliam Patricia Pinto
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia |
| Defense date: | 2008-01-29 |
| Examining board members: |
Eleonore Zulnara Freire Setz;
Stephen Francis Ferrari;
Denise de Alemar Gaspar;
Flavio Antonio Maës dos Santos;
Wesley Rodrigues Silva;
Lisa Maria Veiga
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| Advisor: | Eleonore Zulnara Freire Setz |
| Abstract | |
The ecology of a group of red-nosed bearded sakis (Chiropotes albinasus) was studied between August 2004 and January 2006 in continuous primary forest at the Floresta Nacional do Tapajós, Pará. To investigate food availability and food preferences, tree composition, forest structure and phenology were measured in 16 plots of 25 x 25 m, totaling 1 ha. C. albinasus diet and activity budgets were recorded by instantaneous scan method. This study represents the largest study of Chiropotes in continuous forest. During 38 complete observation days over eleven months, bearded sakis fed on 125 plant species from 38 families (n = 5,197 feeding records). Brosimum parinarioides (Moraceae) was the most used food source (9.5% of records), and has a high selectivity index. Immature seeds were the most consumed items (48.2%), followed by ripe fruit pulp (39.2%) and mature seeds (6.0%). Most time (n = 22,373 activity records) was spent in traveling (36.3%) and resting (27.5%). Feeding represented 23.8% of the records and social activities 8.8%. The group with up to 56 individuals could subdivide in subgroups of variable sizes, which could remain apart for some hours or up to several days. This grouping dynamic differed from other studied bearded sakis. Home range was estimated in more than 1000 ha, one of the largest recorded for a Neotropical primate. Food resource heterogeneity in space and time influenced feeding ecology of the red-nosed bearded saki, which showed preference for more productive plant species and adjusted their foraging patterns to food availability (AU) | |