The principal aim of the study which was conducted between May 1995 and May 1997 was to collect and analyze information that would be considered vital to any future management actions that may be applied to the deer living in the wild in the Bali Barat National Park ecosystem in Indonesia. The systems approach used sought to analyze the complex interactions between the soil, plant, animal and human activity subsystems. In particular, interaction between Rusa deer and Muntjac deer was compared where possible, although the principal focus of the study was on the population of Muntjac deer. The soils in habitats frequented by deer in Bali Barat National Park were found to be of relatively low fertility status. Chemical analysis of the soil revealed that all of the mineral element contents considered in this study were in the lowest range for soils, in general. During this study the population of Muntjac deer in the Bali Barat National Park was submitted to phylogenetic analysis to determine whether the Bali population is distinct. Preliminary results indicate that these deer are apart of a diverse, but monophyletic group of Muntiacus Muntjac. The potential unique status of Muntjac deer in Bali Barat National Park, and the need to preserve them as part of the natural resource base that constitutes the Indonesian archipelago increased the importance of this study of the ecosystem and social system surrounding Bali Barat National Park. / Doctor of Philosophy (PhD)