1. Southwest Watershed Research Center USDA Agricultural Research Service Tucson AZ USA
2. School of Geography, Development & Environment University of Arizona Tucson AZ USA
3. Department of Geography University of Colorado Boulder Boulder CO USA
4. National Center for Atmospheric Research Boulder CO USA
5. School of Forestry Northern Arizona University Flagstaff AZ USA
6. Department of Biology University of New Mexico Albuquerque NM USA