Abstract # 7879 Poster # 4:

Scheduled for Saturday, August 26, 2017 06:00 PM-08:00 PM: (National Ballroom AB) Poster Presentation


EFFECTS OF AGE, SEX, AND REPRODUCTIVE STATE ON INJURY IN PHAYRE'S LEAF MONKEYS

J. A. Feder1, C. Borries1,2, A. Koenig1,2 and A. Lu1,2
1Stony Brook University, Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook, NY 11794, USA, 2Department of Anthropology, Stony Brook University, Stony Brook, NY, 11794
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Primate aggression is an expression of both the need for resources and the costs of potential injury. Therefore, individuals with greater resource needs (e.g., cycling and pregnant females) may engage in aggression and risk injury more than individuals for whom injury would mainly be costly (e.g., lactating females and older individuals). Here we investigated how injuries in Phayre’s leaf monkeys (Trachypithecus phayrei crepusculus) were related to age-sex class and female reproductive state. In this species, young infants are frequently subject to allomothering, which might increase their risk of injury. Furthermore, adult female rank is age-inversed and mainly dependent on individual competitive ability, suggesting that injury risk should be highest in young adults. We used GLMMs to test two years of data on the monthly occurrence of injury (n=64) in two groups at the Phu Khieo Wildlife Sanctuary, Thailand. In the larger group only, young infants experienced a greater proportion of months with injury (β=-0.67; p<0.001). Among adult females, there was a trend toward more injury in young females in the smaller group (β=1.25; p=0.07) and during preconception in the larger group (β=-1.21; p=0.03). Our findings suggest that dependent infants and young adult females experience greater injury risk and that group composition may influence these patterns. Whether injury risk in infants is related to allomothering needs further investigation. Supported by NSF, the Leakey Foundation, and ASP.