Abstract # 98:

Scheduled for Friday, June 20, 2008 05:00 PM-07:00 PM: Session 12 (Ball Rooms A and B) Poster Presentation

Dry Season Ranging Behavior and Intergroup Relations in White-Faced Capuchins (Cebus capucinus) at Santa Rosa National Park, Costa Rica

N. Parr1, F. Campos1, A. Childers2, L. Fedigan1 and K. Jack2
1University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada, 2Tulane University
     Primate ranging patterns are spatial realizations of socioecological pressures. Specifically, they result from a balance of intra- and intergroup interactions related to the acquisition of resources and mating opportunities. We studied the ranging behavior and intergroup dynamics in four neighboring groups of Cebus capucinus in Santa Rosa National Park, Costa Rica from January through May 2007. Using handheld GPS units, we recorded group locations at 30-minute intervals over 1282 contact hours. Range sizes were calculated using adaptive local convex hulls, with core and total ranging areas being defined as the 50 and 100 percent isopleths, respectively. Total range sizes varied from 97.7 ha to 147.9 ha with a mean of 118.2 ha, while core areas varied from 11.3 to 22.2 ha with a mean of 18.7 ha. Daily path lengths differed significantly among groups [Kruskal-Wallis Test, a=0.05], with larger groups exhibiting a tendency towards longer daily path lengths. Dyadic range overlap of neighboring study group ranges varied from 0.0 to 26.5 percent. Males were the primary participants in 29 observed intergroup encounters, with groups exhibiting consistent intergroup dominance hierarchies. Our results suggest that ranging behavior may be influenced by the costs of inter- and intragroup resource competition. Additionally, ranging may be influenced by intergroup variation in male demographics resulting from male dispersal strategies related to long-term intrasexual competition.