Abstract # 119:

Scheduled for Sunday, September 20, 2009 04:30 PM-04:50 PM: Session 11 (Mission Bay Ballroom AB) Symposium


EXPERIMENTAL TESTING OF THREE MODELS OF FEMALE BEHAVIOR IN A GROUP OF COMMENSAL BONNET MACAQUES (MACACA RADIATA) IN MYSORE, INDIA

S. R. Chacko
University of California- San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0532 , USA
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Observational studies have so far been unable to completely distinguish among the three current sociecological models of female sociality. This project was designed to test the differences in the hypotheses regarding the relationship between ecological factors and within-group feeding competition. One group of commensal bonnet macaques (Macaca radiata) in Mysore, India was the study’s focus. All 11 adult females were identified and rank was determined using a modified Landau index. Wheat and raisins were presented on 3×3 meter platforms. The variables tested were: distribution, food size, food spacing, food item size, and food quality. The distribution data have been analyzed for differences in aggression, displacements, affiliation and food site depletion time as well as for rank differences in time on the platform and food consumed. Aggression was higher for the highly clumped distribution than for the dispersed and moderately clumped distributions [Χ², α=0.001]. Affiliation also higher in the clumped distribution [Χ2, α<0.05], however displacements and depletion time were not significantly different. In all distributions there was no significant difference in the time high, middle, and low rank females spent on the platform, but in all trials high ranking females fed significantly more than low or middle ranked females [Χ², α=0.001]. The results support all current models and are the basis for further analysis of the variables that may help distinguish between them.