Abstract # 73:

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


COOPERATING TO COMPETE: EVALUATING BEHAVIORAL COORDINATION IN RESPONSE TO SIMULATED TERRITORIAL INTRUSION IN CHIMPANZEES (PAN TROGLODYTES)

K. A. Cronin1, B. Pieper2, E. J. van Leeuwen3, C. Crockford4 and D. B. Haun3
1Lincoln Park Zoo, Lester E. Fisher Center for the Study and Conservation of Apes, 2001 North Clark Street, Chicago, Illinois 60614, USA, 2Dane County Humane Society, 3University of Jena, Germany, 4Max Planck Institute for Evolutionary Anthropology
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     We investigated cooperative behavior by simulating territorial intrusions with the playback of unfamiliar panthoots. We presented four groups of chimpanzees at Chimfunshi in Zambia with unique, unfamiliar panthoots on three test days. Behavior was recorded live and from camera traps located between the group start and the hidden speaker 50 to 120 meters away. Comparing behavior between interspersed control trials (familiar panthoots from neighboring groups) and test trials indicated that chimpanzees interpreted the playback as a threat (paired t-test N=4 groups, count of individuals who stand bipedally: p<0.001; touch conspecific: p=0.051; approach speaker: p=0.011). Therefore, we questioned if and how chimpanzees coordinated their response with group members, and whether chimpanzees preferentially coordinated with bond partners (quantified by proximity and grooming for the preceding year). Chimpanzees appeared to spatially and temporally coordinate their approach toward the speaker by pausing, visually monitoring, and physically contacting group mates. Chimpanzees preferentially looked at and made physical contact with conspecifics with whom they shared a higher than average social bond (binomial test, look: N=14, p<0.001; contact: N=22, p=0.006). This approach moves beyond the classic experimental paradigm of dyadic coordination to obtain food, and demonstrates the cooperative capacity of chimpanzees in a natural, competitive group context.