1. Natural Resource Ecology Laboratory; Colorado State University; Fort Collins CO 80524 - 1499 USA
2. Department of Biological Sciences; Texas Tech University; Lubbock TX 79409 - 3131 USA
3. Hawkesbury Institute for the Environment; University of Western Sydney; Richmond NSW 2753 Australia
4. Environmental Studies Department; University of California; Santa Cruz CA 95064 USA
5. USDA; Wind Erosion and Water Conservation Unit; 3810 4th Street Lubbock TX 79415 USA
6. The Institute for Environment and Human Health; Department of Environmental Toxicology; Texas Tech University; Lubbock TX 79409 - 1163 USA