Spatial dynamics of two harvested wild pig populations

Simple one-and two-dimensional spatial models are developed for the harvesting of wild pigs in North Sulawesi, Indonesia. The models are used to explore the effects of changes in biological and economic parameter values on the spatial persistence of harvested populations, when off-take must be transported to market. A two-species model shows that the relative catchability of species harvested together strongly affects the distance from market at which each species persists. Due to strong positive feedback, travel costs are a major determinant of the length of the regions where pigs are extinct and exploited.