Abstract # 119:

Scheduled for Friday, August 18, 2006 10:10 AM-10:40 AM: Session 11 (Regency East #3) Oral Presentation

The effects of forest fragmentation on the bearded saki monkey (Chiropotes sagulatus) in the Brazilian Amazon

S. A. Boyle1, W. R. Spironello2 and A. T. Smith1
1Arizona State University, SOLS Graduate Programs, PO Box 874601, Tempe, Arizona 85287-4601, USA, 2Instituto Nacional de Pesquisas da Amazônia
     Habitat loss is a concern affecting the sustainability of ecosystems worldwide. Here we present our findings of the responses of the bearded saki monkey (Chiropotes sagulatus) to forest fragmentation in the Brazilian Amazon. The data presented here were collected during January-December 2005 at the Biological Dynamics of Forest Fragments Project (BDFFP) study sites, located 80 km north of Manaus. We conducted primate censuses in nine forest fragments, ranging in size from 1 ha to 100 ha, and in two areas of continuous forest. If a bearded saki group was present in a fragment, we tracked the group for four days. Every five minutes we recorded the group’s GPS location, and conducted behavioral observations using group scan sampling methods. Although one individual was present in a 1 ha fragment during 2003, no bearded sakis were found in 1 ha fragments during 2005. Two 10 ha fragments and two 100 ha fragments contained bearded saki groups. We found that group size increased with fragment size (p<0.05), average daily distance traveled increased with fragment size (p<0.01), diet differed between periods of high and low fruit abundance, and neither of the 10 ha fragments experienced colonization by new individuals. Our results suggest that there are significant behavioral and ecological differences between bearded saki groups living in fragmented landscapes. This research was partially funded by an ASP Small Conservation Grant.