1. New Mexico State University, Department of Fish, Wildlife and Conservation Ecology, Las Cruces, NM 88003, USA.
2. US Geological Survey, New Mexico Cooperative Fish and Wildlife Research Unit, Las Cruces, NM 88003, USA.
3. New Mexico State University, Economics, Applied Statistics & International Business Department, Las Cruces, NM 88003, USA.
4. University of California-Davis, Wildlife, Fish & Conservation Biology Department, Davis, CA 95616, USA.