1. Department of Wildland Resources Utah State University 5230 Old Main Hill Logan UT 84322 U.S.A.
2. Ecology Center Utah State University 5205 Old Main Hill Logan UT 84322 U.S.A.
3. Southwest Biological Science Center US Geological Survey 2290 SW Resource Boulevard Moab UT 84532 U.S.A.
4. U.S. Department of Agriculture, Agricultural Research Service, Forage and Range Research Laboratory Utah State University Logan UT 84322 U.S.A.
5. Department of Plants, Soils and Climate Department Utah State University Logan UT 84322 U.S.A.
6. Department of Plant and Environmental Sciences New Mexico State University Las Cruces NM 88003 U.S.A.