A MODEL OF SOCIAL STRATEGY DURING NOCTURN AL REST IN MACACA ARCTOIDESIN OUTDOOR CAPTIVITY

Social strategies are complex behaviors that individuals develop in or der to obtain individual benefits within their belonging group. Non hu man primate's daily behaviors are affected by such strategies determin ing several individual benefits (obtaining food, the capacity to estab lish ''good'' relations within the group, the idea of belonging to a h igher social status and access to copulation). Such behaviors have bee n studied during the wakefulness period. However, similar behaviors ar e exhibited during the night, which suggests a model of social strateg y related to sleep quality. In this work, daytime and night time behav ior, as well as sleep behavior associated to kinship and gender in all ages were studied in a heterosexual group of ten stump tail macaques (M. arctoides) housed in exterior captivity in the Department of Ethno logy of the Neuroscience's Division of the Mexican institute of Psychi atry. Spontaneous behaviors were recorded and analyzed by means of hig h sensitivity video recordings for 60 hours. Multidimensional continge ncy table analysis, with gender and kinship as factors, was applied to data following a log-linear model. Then, the standardized residuals w ere computed to test the size of the discrepancies between the observe d and predicted frequencies of each behavior, as summarized by a chi-s quare statistic. Differences in the playing and shaking behavior with relation to their if kinship were observed. Also, significant differen ces were found in shaking, social grooming, aggression, consolidation and sleep behaviors in relation to gender.