The application of discrete choice models to wildlife resource selection studies

This paper introduces the theory and application of discrete choice models to resource selection studies. Discrete choice models calculate the probabi lity of an individual selecting a resource as a function of the attributes of that resource and all other available resources. The data for these attr ibutes may be continuous or categorical. When availability is the same for all individuals and only two resources are available, the multinomial legit discrete choice model reduces to the logistic model. Discrete choice model s and advances in GIS technology give the researcher flexibility in definin g resource availability separately for each individual over time and space. The output of the discrete choice approach also provides managers with a t ool to explore the effects of potential management actions and provides res earchers with new hypotheses deserving of further investigation, To illustr ate the application of discrete choice models to resource selection studies , we present a case study of summer diurnal bed site selection by elk (Cerv us elaphus) in Cuter State Park, South Dakota, United States. The results d emonstrate the importance of factors relating to thermal regulation, hiding cover, and potentially forage, in elk bed site selection in this region.