Rubin, E., Stermer, C., Boyce, W. & Torres, S. Assessment of Predictive Habitat Models for Bighorn Sheep in California's Peninsular Ranges. JOURNAL OF WILDLIFE MANAGEMENT 73, 859-869 (2009).

This study compared 3 models for predicting the habitat use of Bighorn Sheep in southern California’s Peninsular Ranges.  Two of these models are specific to use with GIS, the Ecological Niche Factor Analysis(ENFA) and the General Algorithm for Rule-set Production(GARP).  These framework models were tailored to Bighorn sheep in the study area using day time GPS coordinates collected from GPS-collared individuals in 5 subpopulations, and the resulting analyses were comnpared to analyses obtained from the non-GIS model that is recommended by the U.S. Fish and Wildlife recovery plan for Bighorn sheep.  Both GIS models proved to yield results comparable to the expert-based model, with the GARP model being slightly more statistically powerful than the ENFA model.  This is another good example of using GIS models to prove existing models and the power of GIS to offer various methods of achieving the same result.