Abstract # 203:

Scheduled for Saturday, June 22, 2013 11:15 AM-11:30 AM: Session 24 (Auditorium) Oral Presentation


C. A. Shaffer
University of Missouri - St. Louis, St. Louis, Missouri 63121, USA

Bearded sakis (genus Chiropotes) and uakaris (Cacajao) are the widest ranging neotropical primates and among the widest ranging of any primates for their body size. Unfortunately, lack of data from continuous forest populations of these taxa has made understanding the factors influencing such large ranges difficult. To assess correlates of range size, I collected data on the ranging behavior of a 65 individual group of Chiropotes sagulatus in a continuous forest in Guyana over a 15-month period. The study group used a home range of 1000 ha and had a mean daily path length of 4 km. Daily path length was not correlated with group size, patch quality, food availability, or the spatial distribution of feeding trees. Daily path length was positively correlated with ripe fruit consumption, and dietary diversity, and home range size was positively correlated with percentage of seed eating. These results, combined with those of other recent studies of Chiropotes and Cacajao in continuous forest, suggest that large home ranges (approaching 1000 ha) are characteristic of these genera. The size of these ranges is in marked contrast to the much smaller ranges of the other member of the Pitheciinae, Pithecia. While variation in range sizes across the Pitheciinae may be related to group size, I suggest dietary differences and variation in the ability to digest highly fibrous seeds as additional explanations.