Abstract # 5955 Event # 116:

Scheduled for Sunday, September 14, 2014 02:45 PM-03:00 PM: Session 19 (Decatur A) Oral Presentation


INFLUENCE OF FRUIT AND INVERTEBRATE AVAILABILITY ON PATTERNS OF SPATIAL ASSOCIATION IN WHITE-FACED CAPUCHIN MONKEYS (CEBUS CAPUCINUS) IN NORTHEASTERN COSTA RICA

E. K. Mallott
University of Illinois at Urbana-Champaign, Department of Anthropology, 109 Davenport Hall, 607 S Mathews Ave, Urbana, IL 61801, USA
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     The influence of variation in fruit availability on patterns of spatial association in nonhuman primates has been well studied; however, for highly insectivorous primates, such as Cebus capucinus, variation in invertebrate availability is likely equally influential. To better understand how variation in both fruit and arthropod availability influences patterns of spatial association in primates, a group of C. capucinus was followed for a 12-month period (1341 hours of observation) at La Suerte Biological Field Station. Using instantaneous focal sampling, information on activity budget, diet, nearest neighbor distance, and feeding subgroup size and spread were collected for adult female (n=5), adult male (n=4), and juvenile (n=12) individuals. Fruit availability was assessed at 2-week intervals using 25 100x4 meter transects. Arthropod availability was measured using canopy insect traps (n=10) and sweep nets (n=10) every 2-weeks. There was no effect of fruit or insect availability on feeding subgroup size or spread (GLM, all p>0.05). Periods of high fruit availability had slightly but significantly larger nearest neighbor distances than periods of low fruit availability (8.30±7.20m vs. 7.85±7.21m) and periods of high arthropod availability had slightly but significantly smaller nearest neighbor distances than periods of low arthropod availability (7.82±6.98m vs. 8.31±7.39m) (GLM, F(1,1590)=15.774 and F(1,1590)=12.515, all p<0.001). These results indicate that variation in food availability has minimal effect on C. capucinus patterns of spatial association in this population.