Abstract # 4538 Event # 198:

Scheduled for Saturday, June 22, 2013 10:00 AM-10:00 AM: Session 24 (Auditorium) Oral Presentation


M. A. Norconk1, T. Gregory2 and C. L. Thompson3
1Kent State University, Kent, OH 44242, USA, 2Smithsonian Institution, 3Northeast Ohio Medical University

The platyrrhine family, Pitheciidae, is known for its highly divergent dentition, tendency to eat seeds, and deep evolutionary history dated to 20 mya. Recent studies have found tremendous diversity in social behavior within this clade of four genera that does not map easily onto their ecology, but may provide insight into how multi-male groups evolve. Titis (Callicebus spp.) at the base of the radiation have the least specialized diet, the lowest seed intake of the clade and few dental specializations. They occupy the broadest range of habitats of the pitheciids, are reportedly uniform in having cohesive pair bonds, paternal care, territoriality, and duetting. If titis are at one end of a socio-sexual continuum, then the two largest-bodied taxa are at the other end. Chiropotes spp. and Cacajao spp. form large fission-fusion multi-male, multi-female groups that are strongly dependent on seeds, have large day ranges, and exhibit affiliative male social behaviors. Pithecia (sakis) represent a socal behavioral middle ground often found in small one-male groups. While social bonds are strong between male-female pairs, sakis are not sexually monogamous. Pithecia spp. have the most variable expression of traits such as sexual dichromatism, habitat use, home range size, and behavioral correlates of territoriality. Variable one-male groups seen in Pithecia that retain strong affiliation between males and females could be transitional from monogamy to larger multi-male polygynous groups.