Abstract # 13240 Poster # 110:

Scheduled for Thursday, August 9, 2018 06:00 PM-08:00 PM: (Chula Vista ) Poster Presentation


M. Tyrrell1, C. M. Berman1, M. Agil2, T. Sutrisno2 and A. Engelhardt3
1University at Buffalo, State University of New York, Buffalo, NY, USA, 2Bogor Agricultural University, Bogor, Indonesia, 3Liverpool John Moores University, Liverpool, United Kindom
     Crested macaques (Macaca nigra) have been classified as extremely socially tolerant according to Thierry’s social style scale. While this categorization has proven valid for females, social relationships between males have been characterized as extremely hierarchical and rigid by some researchers and extremely tolerant by others. It remains thus unclear how well Thierry’s scale fits males. We observed male relationships in 3 wild, habituated groups in the Tangkoko Reserve, Indonesia, using all-occurrence, focal animal sampling and point-time sampling. We observed 29 adult males for a total of 2598 hours between March 2016 and February 2017. Crested macaque males exhibited a suite of measures consistent with a moderately tolerant social style. Indications of tolerance included low proportions of aggression involving biting (median=0%, range=0%-1%, n=3 groups) and other contact aggression (median=1%, range=1%-4%, n=3), moderate hierarchical steepness (mean=0.39), and high conciliatory tendencies (CCT=31.0%; 28 attracted pairs, 6 dispersed pairs, 27 neutral pairs, Wilcoxon signed-ranks test: V=74, p<.0005). However, proportions of counter-aggression were low (median=4%, range=3-4%, n=3). Unlike tolerant and moderately tolerant female macaques, rates of overall affiliation (median=0.75 interactions/hr, range=0.69-2.53, n=3) were very low, and males appeared to avoid one another. Hence, the suite of traits frequently used to identify “tolerant” social styles do not necessarily imply friendliness and social bonding in males. We conclude that the use of social style criteria should be applied separately to each sex.