Abstract # 20:

Scheduled for Thursday, June 19, 2008 02:00 PM-03:00 PM: (Meeting Room 2DEF) Featured Speaker

From kinship to friendship: Cooperation and affiliation in male New World primates

P. A. Garber
Univ. of Illinois Urbana-Champaign, Dept. of Anthropology, 109 Davenport Hall, 607 S. Matthews Ave., Urbana, IL 61801, USA
     Traditional studies of primate sociality have focused on the roles of competition and aggression in structuring within-group social interactions. However, group living requires that individuals form predictable social relationships, exploit a common set of resources, and defend a common range, which is facilitated by the development of mutually beneficial social bonds. In this regard, the study of New World monkeys offers critical insight into models of sociality in which the potential costs of group living are offset by the benefits of social affiliation and cooperation, especially among adult males. Male cooperation in New World primates occurs in several contexts: males remaining in their natal group to help care for younger siblings, males dispersing from their natal group with partners that are known or suspected to be brothers or father-son pairs, phylopatric males that are highly tolerant of each other and share sexual access to reproductive partners, unrelated males that act co-operatively in female mate defense, and the participation of unrelated males in infant care. In contrast with many species of Old World monkeys, established groups of New World monkeys contain a relatively equal number of adult males and adult females, which is likely to influence mating strategies and social behavior. In this presentation, I explore the costs, benefits, and basis of male cooperation in platyrrhines using models of partner competency, byproduct mutualism, and kin selection.