Abstract # 13150 Poster # 89:

Scheduled for Thursday, August 9, 2018 06:00 PM-08:00 PM: (Chula Vista ) Poster Presentation


SEX-SPECIFIC FEEDING BEHAVIOR IN WEDDELL’S SADDLEBACK TAMARINS (LEONTOCEBUS WEDDELLI) IN NORTHWESTERN BOLIVIA

L. M. Porter3, W. M. Erb1 and A. Di Fiore2
1Northern Illinois University, Dept. of Anthropology, DeKalb, IL 60115, USA, 2University of Texas at Austin, 3Northern Illinois University
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     Males and females of many species show sex-specific foraging strategies, which result from distinct energetic demands caused by differences in their body sizes and reproductive costs. Callitrichines are unusual primates in that 1) females may weigh slightly more than males and simultaneously lactate and ovulate and 2) males regularly engage in infant transport, thereby reducing the costs of infant care for females. Thus, it is unclear how male and female energetic demands differ in these cooperative breeding groups and whether dietary differences exist. In this study, we compared overall feeding frequencies and the frequency of fruit, insect, and exudate consumption by adult males and females. We studied four groups of Leontocebus weddelli in Bolivia on 175 days between August 2013 and September 2014. All groups comprised a single breeding female associated with 2-3 adult males (n=25 study animals). We used focal animal sampling at 5-min intervals to record feeding data (n=1,528 records). Using a GLM, we examined whether food type and overall feeding frequencies varied by sex. Females consumed food significantly more frequently (24% of activity) than males (17% of activity) in the two months postpartum but not during other periods. However, we found no sex differences in food type consumption across any period. Thus, despite the help of males, females must increase foraging to cope with postpartum reproductive costs.