1. Hawkesbury Institute for the Environment University of Western Sydney Penrith South NSW 2751 Australia
2. Natural Resource Ecology Laboratory Colorado State University Fort Collins CO 80523 USA
3. Department of Biology Algoma University ON P6A 2G4 Canada
4. Center for Carbon, Water and Food University of Sydney Camden NSW 2750 Australia
5. Department of Ecosystem Science and Sustainability Colorado State University Fort Collins CO 80523 USA
6. Department of Botany University of Wyoming Laramie WY 82071 USA