Abstract # 95:

Scheduled for Thursday, August 18, 2005 07:00 PM-09:00 PM: (Cambridge/Oxford Room) Poster Presentation

Social Exchange in Male Lion-tailed Macaques (Macaca silenus)

E. L. Terney and P. G. Judge
Bucknell University, 55 N. 8th St., Apt. 6, Lewisburg, PA 17837, USA
     The reciprocal exchange and interchange of social behavior has been well documented in a number of primate species, typically among females. However, research on male bonnet macaques (Macaca radiata) and chimpanzees (Pan troglodytes) indicate that males are capable of forming and maintaining long-term social bonds through social exchange. Unlike bonnet macaques, male lion-tailed macaques (Macaca silenus) dispersing from their natal groups travel alone and do not associate with one another in the wild. In this study, behavioral observations were conducted on a captive group of five male lion-tailed macaques to test for reciprocity and interchange of affiliative behaviors and aggressive interactions. Results of matrix permutation tests indicated that neither grooming (Kr = 4, Pr = 0.281) nor aggression (Kr = 3, Pr = 0.155) were reciprocated, with grooming generally directed up the dominance hierarchy and aggression directed down. Aggression and grooming activity were not correlated (Kr = 0. Pr = 0.5317), suggesting that grooming was not exchanged for tolerance. However, there was a significant negative correlation between aggression and proximity (Kr = 10, Pr = 0.0340) and a nearly significant negative correlation between aggression and vicinity (Kr = 8, Pr = 0.0750). Results indicate that male lion-tailed macaques spend more time near partners who do not behave aggressively towards them and behave more aggressively towards individuals they do not associate with.