Abstract # 9:

Scheduled for Wednesday, June 19, 2013 10:30 AM-10:45 AM: (San Geronimo Ballroom B) Symposium


GROUP SIZE, COMPOSITION, BODY MEASUREMENTS, AND RELATEDNESS IN WILD WEDDELL’S SADDLEBACK TAMARINS: IMPLICATIONS FOR UNDERSTANDING PRIMATE MATING PATTERNS

P. A. Garber1, L. M. Porter2, J. Spross3 and A. Di Fiore4
1University of Illinois, Department of Anthropology, Urbana, Illinois 61801, USA, 2Department of Anthropology, Northern Illinois University, Dekalb, Illinois, 3Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, 4Department of Anthropology, University of Texas, Austin
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     Tamarins of the genus Saguinus are reported to live in small multimale-multifemale social groups characterized by a single breeding female. Here we present information on the size and composition of 12 groups of wild-trapped, measured, and released Weddell’s saddleback tamarins from northern Bolivia, along with data on individual morphometrics and genetic relatedness for a subset of these groups. Mean group size was 6.25 ± 1.6 including an average of 2.16 adult males (range 1-4) and 2.0 adult females (1-3). No group contained only one adult male-adult female pair. Adult females (N=24) were significantly heavier (390.8 gm ± 33.5) than adult males (N=23; 359 gm ± 31.9) (p<.002). Although there was no evidence that more than one female in each group was currently breeding, 25% of groups contained two parous females. Using DNA from pulled hair, we identified 13 polymorphic markers for assessing genetic relatedness. Across the population, mean relatedness was low and not significantly different for adult males and adult females, suggesting that both sexes disperse from their natal groups. However, adults of both sexes tended to have close-same sex relatives within their groups; relatedness among adult females of the same group averaged 0.44 and among adult males was 0.40. We argue that polyandry rather than monogamy is the primary mating pattern of Saguinus fuscicollis weddelli and other tamarin species.