Abstract # 109:

Scheduled for Friday, August 19, 2005 10:00 AM-10:15 AM: Session 8 (Mayfair Room) Oral Presentation

Patterns of male and female range use in white bellied spider monkeys (Ateles belzebuth) in YASUNÍ National Park, Ecuador

S. N. Spehar1,2, A. Link1,2 and A. Di Fiore1,2
1New York University, NYU Anthropology Dept., 25 Waverly Pl., New York, NY 10003, USA, 2New York Consortium of Evolutionary Primatology
     Patterns of range use in spider monkeys have been described as similar to chimpanzees, with individual females more commonly found in core areas that constitute a fraction of the total community range, and with males using larger home ranges that are largely coincident and overlap those of multiple females. Therefore, spider monkeys, like chimpanzees, are usually considered sex-segregated in their ranging behavior. Over two and a half years of research (July 2002- December 2004) on one community of spider monkeys (Ateles belzebuth) in western Amazonia, we characterized the ranging patterns of adult male and female community members (5 males, 13 females) and evaluated the extent to which they conform to previously reported patterns. Focal animals were followed continuously for between one and 12 hours, and the location of focal animals was recorded every 5 minutes. Subgroup composition, used to augment the set of location data, was recorded every 15 minutes. In contrast to ranging patterns at other sites, the ranges of study females overlapped considerably, with little evidence of exclusive range use by individuals. Average male and female home range size was comparable, and data on subgroup composition suggested that all male subgroups were less common than reported elsewhere. Our data suggest that some spider monkeys populations may live in less sex-segregated societies than previously thought. Comparison with results from other species of Ateles highlights interesting variation in fission-fusion sociality within this geographically widespread genus.