Abstract # 13288 Event # 57:

Scheduled for Thursday, August 22, 2019 02:15 PM-02:30 PM: (Room 326) Oral Presentation


K. N. Gartland1, A. J. Hickmott1, C. M. Brand1, L. R. Ulibarri1, K. Coleman2 and F. J. White1
1University of Oregon, Department of Anthropology, 1218 University of Oregon, Eugene, Oregon 97403, USA, 2Oregon National Primate Research Center
     Adult male macaques have been observed to establish affiliative relationships with juveniles. In cases where the juvenile was the probable offspring of the adult male, these behaviors have been largely attributed to the kin selection hypothesis. However, males have also been observed to invest in non-kin juveniles, which requires other explanations. Adult male Japanese macaques at the Oregon National Primate Research Center have been observed carrying, grooming, and providing support in juvenile-directed aggressive interactions. We conducted 154 hours of focal observations on 14 adult males (7-25 years of age) with special attention to their social behaviors directed towards juveniles from June to September 2018. We ran an ANOVA which demonstrated that individual males differed significantly in their care, attention and protection of unrelated juveniles (F =3.436, df =13, 42, P<0.001). We also ran a linear regression which showed that age had a significant effect with older males engaging in significantly more affiliative behavior with juveniles than younger males (F =15.65, df =1,54, P<0.001, R2adj = 0.2104). Although relatively common, this behavior has not been widely reported in captive groups of macaques. More work is needed to examine potential causes, including the possibility that it is “learned”.