Abstract # 1057 Poster # 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
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     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.