Abstract # 82:

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


WITHIN-GROUP SPATIAL POSITION AND SWATH GEOMETRY OF BEARDED CAPUCHIN MONKEYS (SAPAJUS LIBIDINOSUS)

A. Howard1, C. Jones2, W. Fagan1 and D. Fragaszy2
1University of Maryland, Department of Biology, College Park, MD 20742, USA, 2University of Georgia
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     The location of animals in space in relation to one another is a fundamental feature of social organization. At the group level, social relationships may be indicated by group density, within-group spatial position and swath geometry. At the level of individuals, social networks and affiliative relationships are derived from repeated measures of spatial proximity. We evaluated a novel method for collecting spatial locations of members of one group of capuchin monkeys using GPS-enabled tablets. For each recording, four researchers scanned the group for a maximum of 8 minutes, locating individuals visually within the image. Separately, we evaluated the accuracy of the GPS sensors and the accuracy of the humans in marking particular points. We conducted a total of 199 scans and observed 70.4% of the group on average (sd = 3.4 individuals). The group’s average swath size was 1046.8 m2, with a mean buffer around each monkey of 65.7 m2. As a whole, males had a mean inter-individual distance from other males of 23.9 m. Male-female inter-individual distance was of 22.8 m and female-female was 20.8 m. The shape of the group swath was often a horizontal wedge in relation to the direction of travel. We evaluate the usefulness of this system for measuring spatial properties of the group over time, social relationships among individuals, and variability of spatial organization in relation to landscape characteristics.