1. Department of Ecosystem Science and Management, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
2. Department of Agricultural and Applied Economics, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
3. Department of Geography and City & Regional Planning, California State University, Fresno, 2555 E. San Ramon Avenue, M/S SB69, Fresno, CA 93740, USA