The 84th Annual Meeting of the American Association of Physical Anthropologists (2015)

Spatial structure in the distribution of feeding trees used by the Japanese macaques of Yakushima Island, Japan


1Ecosystem Informatics Division, Nat Inst Agro-Environmental Sci, 2Lab Human Evolution Studies, Kyoto University

March 28, 2015 , Gateway Ballroom 2/3/4/5 Add to calendar

Home range utilization may reflect multiscale spatio-temporal problems faced by primates. Many statistical methods are now available to researchers for analyzing the spatial structure of primate home range use in GIS software. We report results of spatial analyses on the locations of trees used by female Japanese macaques (Macaca fuscata yakui) in Yakushima, Japan. First, we applied a kernel density estimate on feeding locations. Second we applied Hot-Spot analysis and Moran’s I spatial autocorrelation tests on the trees for number of days of tree use and time spent in trees. The kernel density estimate was largely consistent with the Hot-Spot analyses identifying clusters of trees used by monkeys. In addition, Moran’s I spatial autocorrelation test found significant autocorrelation in the number of days of tree use. However, spatial autocorrelation was weak for time spent in trees, and statistical significance depended on one tree species. Removing that tree species resulted in no significant autocorrelation for time spent in trees within the home range as a whole for all remaining tree species or any one tree species. These results are partly due to differences in the statistical measures, but we also interpret the results to be due to the time-space budget of the monkeys. Multiple use trees may be located near places where monkeys carry out other activities, especially grooming, in addition to feeding. By contrast, monkeys can spend large amounts of time feeding in trees that they rarely visit distributed throughout the home range.