Abstract # 192:

Scheduled for Friday, August 18, 2006 07:00 PM-09:00 PM: Session 17 (Regency West 1/3 ) Poster Presentation

Agonistic interactions in corral-living groups of pigtailed monkeys (Macaca nemestrina): Females with and without infants

E. L. Zucker
Loyola University, Department of Psychology, New Orleans, LA 70118, USA
     Data from 7 groups of pigtail macaques at the Tulane National Primate Research Center indicated that more female-female agonism occurred in groups with high female-to-male ratios. Further analyses focused on group structure variables and whether participants had dependent infants (designated FI) or not (designated F). Overall, 47% of 622 agonistic interactions involved two F females (52% of possible dyads), 21% by F toward FI females (20% of dyads), 23% by FI toward F females (20% of dyads), and 9% between FI females (8% of dyads; chi-squared = 7.63, df = 3, p = 0.0543). For the 6 groups in which all combinations occurred, the distribution of agonism deviated from expected in 3 groups, while approaching significance in another, although two different patterns of deviation existed. Overall, the proportion of total agonism by F toward FI females was negatively correlated with the number of males in the group (r = -0.91, p = 0.004, df = 5) and the proportion of agonism by FI toward F females was negatively correlated with the female-to-male ratios in groups (r = -0.82, p = 0.022, df = 5). Thus, the number of males appears to mediate agonistic interactions of females, particularly females with infants, perhaps related to increased risks for psychosocial stress, injury, and mortality. Supported by NIH grants RR00164 and RR00166 to the TNPRC and WaNPRC, respectively.