Abstract # 71:

Scheduled for Thursday, June 18, 2015 06:00 PM-08:00 PM: (Cascade AJBCD) Poster Presentation


G. J. Clifton1, L. K. Sheeran1, R. S. Wagner1 and J. H. Li2
1Central Washington University, 400 East University Way, Ellensburg, WA 98926, USA, 2School of Life Sciences, Hefei Normal University, 1688 Lianhua Road, Hefei, Anhui, 230601, China
     Bridging is an affiliative interaction in which two individuals lift an infant or juvenile between each other. Male-male bridging has been studied in several macaque (Macaca) species, but female-female bridging has received less focus. Bridging between males is believed to act as an agonistic buffer, but it may function differently for females. We studied female-female bridging in provisioned Tibetan macaques (M. thibetana) from August-September 2014. We predicted that female-female bridges would show distinct patterns when compared to what has been reported for males. We recorded bridging behavior (n=119, 76 successful, 43 unsuccessful) from an ethogram using all-occurrences and focal-animal sampling of 8 adult and 4 subadult females. Rank was positively correlated with bridge initiations for females (Spearman’s rank correlation; rs=0.75, n=12, p<0.05), but in contrast to what has been reported for males, within bridging dyads, initiators were not more likely to be subordinate to recipients (Wilcoxon signed rank; z=0.53, n=21, p>0.05). Initiators utilized infants as the bridge more often than juveniles (Wilcoxon signed rank; W=33, n=9, W(p<0.05)=29), but bridges were equally likely to succeed with either (chi square test; X2=0.93, df=1, p>0.05). Mothers more often received bridges utilizing their own offspring (Wilcoxon signed rank; W=21, n=6, W(p<0.05)=17). Our data suggest that female-female bridging in this study group is not consistent with the trends reported in male-male bridging. Supported by NSFC (30970414, 31172106) and NSF-OISE (1065589).