Abstract # 2254 Event # 200:

Scheduled for Saturday, June 23, 2007 12:05 PM-12:20 PM: Session 19 (North Main Hall C/D) Symposium

Like Father, Like Son: Social Strategies of Cottontop Tamarin Family Males (Saguinus o. oedipus) in Two Life History Stages

A. J. Ginther and C. T. Snowdon
University of Wisconsin - Madison, Departments of Zoology and Psychology, 1202 West Johnson Street, Madison, WI 53706, USA
     Costs and benefits to breeders and helpers should affect social investments adult males make with family members. Adult cottontop tamarin sons in natal groups are sexually active and not hormonally suppressed, but also act cooperatively as primary infant care helpers in groups where their mother is the breeding female. Yet instead of conflict and social control, confluence of interest may make affiliative, bonding, or tolerant social investments the best strategy for adult males based on lifetime reproductive success. We analyzed patterns of dyadic social interactions in 6 captive families using ANOVA [a=0.05]. Fathers displayed significantly more affiliation with dams than with adult sons or other family members; but less aggression and threats with adult sons than with other offspring. Adult sons were significantly more aggressive with immature brothers, and least with parents. Whereas fathers appear tolerant, adult sons may play a dual role, being competitive with brothers and tolerant with fathers. Fathers and adult sons did not differ in mount rate with pregnant group mothers, and post-mount interactions were nearly all affiliative (98%). The sons, however, were most often the initiators of post-mount affiliation. Social tolerance of adult sons’ behavior may be important to retain alloparental services, and dams may bond with adult sons as well as with sires. Family relationships influence social strategies in cooperatively breeding primates. Supported by MH035215.