1. Sustainability Research Institute, School of Earth and Environment, University of Leeds Leeds UK
2. Lolldaiga Hills Research Programme, P.O. Box 26 Nanyuki Kenya
3. Mpala Research Centre Nanyuki Kenya
4. USDA–ARS Rangeland Resources Research Unit Fort Collins CO USA
5. Department of Wildland Resources and Ecology Center Utah State University Logan UT USA
6. The Nature Conservancy, 258 Main Street, Suite 200, Lander Wyoming USA
7. Department of Environment and Geography University of York York UK
8. Department of Plant Sciences and Ecology Graduate Group University of California Davis CA USA