Jason Lefrandt, Brigham Young University
Social and Behavioral Sciences
Dominant behaviors frequently occur in both human and non-human primates. In the non-human primate world, high and low dominance rankings are rated through interactions recorded within the group, specifically, aggressive and submissive behaviors. Dominance within Rhesus macaques (Macaca mulatta) also tends to be governed by a matrilineal effect: meaning that if two monkeys are in the same family, than both monkeys will show similar rankings within the group. This current study looks into how genotypic variables correlate with overall behavioral expression in dominance. Utilizing archived dominance and genetic data from the National Institute of Health including serotonin, MAO-A, and rearing, we analyzed the correlations with social dominance rankings of rhesus macaques. In order to control for matrilineal effects within established groups, all subjects were placed in smaller, newly formed social groups. This was done in order to facilitate great analyses of genetic influences on dominant behavior. Our original hypothesis was that macaques with long homozygote serotonin for the long allele; were mother-reared; and have the MAO-A gene will have high social dominant rankings. On the contrary, our preliminary findings have shown that subjects who were reared by mothers who were not genetically their own tend to show more dominant related behaviors, and are subsequently rated much higher than those subjects who were mother-reared or peer-reared.