ABSTRACT. Genetic variations within and between troops of the Indonesian crab-eating macaque (Macacafascicularis) were studied. A total of 456 blood samples were collected from 29 free-ranging troops in 19 different localities on Sumatra, Java, Bali, Lombok and Sumbawa. Blood protein polymorphisms were examined electrophoreticalty. Mean genetic variability within troops was estimated to be Pvoly = 12.22~ and/-1 = 3.84~. Troops inhabiting small islands showed lower variability. Genetic differences were more marked between troops on different islands than between troops on the same island. Additionally, clinal variations of allelic frequencies at some loci were detected. The genetic features and socio-ecological and evolutionary implications are discussed.

ABSTRACT. The blood protein polymorphism of five local populations of Indonesian crab-eating macaques (cynos) was examined by gel electrophoresis. The measured genetic variability was compared with previous research results for Asian macaques. It was found that the level of genetic variability was mostly lower than that of Asian mainland macaques but higher than that of local troops of Japanese macaques. A remarkable genetic differentiation in Bali cynos from South Sumatra/West Java cynos was demonstrated. This result was inconsistent with the subspecies classification of cynos in Indonesia.