Relating populations to habitats using resource selection functions

Habitat use can be characterized by resource selection functions (RSFs) that are proportional to the probability of an area being: used by an animal. We highlight two procedures that have recently been used to relate RSFs to population density, dependent upon which field procedures are practical for a species. These new developments allow RSF models to be interfaced with geographical information systems (GIS) to map the probability of use, and ultimately populations, across landscapes.