Abstract # 6:

Scheduled for Thursday, August 18, 2005 10:45 AM-11:00 AM: Session 1 (Parliament Room) Oral Presentation

Provisioning of Young in Two Populations of Wild Golden Lion Tamarins (Leontopithecus rosalia)

L. G. Rapaport1 and C. R. Ruiz-Miranda2
1University of New Mexico, Department of Anthropology, Albuquerque, NM 87131, USA, 2Universidade Estadual do Norte Fluminense
     Provisioning weaned young is an integral part of the cooperative breeding system of marmosets and tamarins (family: Callitrichidae). Juvenile callitrichids receive a substantial proportion of their diet from adult group members, who may even actively initiate food transfer. For the juveniles of most other primate species, food is received from the mother through scrounging, and food transfer occurs at low frequencies. We conducted a longitudinal study of young wild golden lion tamarins 9-56 weeks of age in two different reserves in southeastern Brazil. The reserves present the tamarins with contrasting habitats: the Uniao consists of primary and late-stage secondary Atlantic rainforest while Poço das Antas contains secondary forest and regenerating agricultural land. General patterns of provisioning did not differ substantially between the two sites. For instance, rates at which juveniles received food were strikingly similar at all age categories (Mann-Whitney U-tests: 9-24wk: ns; 25-40wk: ns; 41-56wk: ns). Prey was provisioned more frequently than fruit (Wilcoxon signed-ranks test: Uniao: P = 0.002; PdA: P = 0.012). However, the proportion of prey that was provisioned was higher (88.4 ± 3.7% vs 75.6 ± 3.1%: Mann-Whitney U-Test, P = 0.03), and adult resistance to transfer was lower (9-24wk: P = 0.0004; 25-40wk: P = 0.0007; 41-56wk: P = 0.03), at Poço das Antas. Habitat variation may affect infant care behavior and ultimately may influence feeding proclivities.