Abstract # 13215 Poster # 80:

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


D. A. Bertrand5, C. M. Berman5,1, S. W. Margulis2, A. Muhammad4, U. Sutiah4, A. Engelhardt3, A. Engelhardt3,6 and M. Agil4
1University at Buffalo, Department of Anthropology, 380 Fillmore Academic Center , Ellicott Complex, North Campus, Buffalo, NY 14261, USA, 2Canisius University, Departments of Animal Behavior and Biology, Buffalo NY, 3German Primate Center, Primate Sexual Selection, Goettingen, Germany, 4Bogor Agricultural University, Faculty of Veterinary Medicine, 5University at Buffalo, 6Liverpool John Moores University, School of Natural Sciences and Psychology
     Crop raiding by primates is common in human/primate overlapping ranges. While killing offenders is the most harmful method of prevention, we know little about how stressful non-lethal techniques are. We assessed effects of crop guarding (CG) by frightening monkeys away on stress-related and social behavior in three groups of critically endangered wild crested macaques (Macaca nigra) exposed to different amounts of CG in the Tangkoko Reserve, Sulawesi, Indonesia. R2 group was exposed to frequent CG, R1 to less frequent CG, and PB1 to no CG. However, CG was noisy, and all groups were within hearing distance. Almost 800 hours of data were collected over 11 months from thirty-three adults of both sexes via focal animal, all occurrence, point time, and 1/0 sampling. All data were analyzed with General Linear Mixed Models. When we examined focal sessions when CG was not actually occurring, we found that all groups displayed self-directed behaviors (SDB) (Z=-5.46,p<.001), vocalized (Z=-2.64,p=.008), and affiliated (Z=2.80,p=.005), more in months when the number of CG events in the reserve were lower. Hence, many behaviors were subdued when CG was frequent. However, aggression was higher in groups with more exposure to CG [R1>R2>PB1 (Z=2.39, p=.012; Z=2.04, p=.042; Z=-2.39, p=.017]. Overall, results suggest that frequent CG may negatively affect behavior even in groups that are not directly exposed and even when exposed groups are not experiencing CG.