Abstract # 4537 Poster # 72:

Scheduled for Thursday, June 20, 2013 07:00 PM-09:00 PM: Session 9 (SG Foyer ABC) Poster Presentation


LOW JUVENILE MORTALITY AND MINIMAL SEX DIFFERENCES IN AGE-SPECIFIC SURVIVAL CURVES OF WILD OWL MONKEYS (AOTUS AZARAI) OF ARGENTINA

S. M. Larson1, E. Fernandez-Duque1, F. Colchero2 and O. Jones2
1University of Pennsylvania, 4619 Chester Ave. Apt. A208, Philadelphia, PA 11943, USA, 2Max Planck Institute for Demographic Research (MPIDR)
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     The forested habitat, partial nocturnality, and behavioral profile of the monogamous Azara’s owl monkey present frequent challenges to demographic data collection, and by extension the examination of the influence of monogamy and biparental care on survivorship. We present the results of a Bayesian Survival and Trajectory Analysis (BaSTA) to estimate age-specific survival curves from recapture data. We predicted that high parental care would buffer the early-life declines in survivorship seen frequently in primates and that males and females would have similar age-specific mortality patterns as both are intensively involved in the care of offspring. Our data were the 215 capture and recapture events of 149 owl monkey subjects, between 1999 and 2012. The birth and death timings were known for 143 and 26 individuals respectively. We report the age-specific survival distributions and Divergence Information Criterion (DIC) generated from four different mortality functions (Weibull, Gompertz, Logistic, and Exponential) extended to three different shapes (Simple, Makeham, and Bathtub). We found that the best performing model was the Weibull-Simple, suggesting that high levels of early-life mortality (as would-be suggested in the Bathtub shape) were not present in this sample. Furthermore, we report minimal difference in the probability distributions of males and females as measured by the Mean Kullback-Leibler Discrepency Calibration (KLDC) in all models, suggesting that males and females followed similar survivorship trajectories.