John B. Bradfordreceived the Ph.D. degree from Colorado State University, Fort Collins, CO, USA. He is a Research Ecologist with the Southwest Biological Research Center, U.S. Geological Survey, Flagstaff, AZ, USA. His research interests include the consequences of changing climatic conditions and land-use practices on terrestrial ecosystem structures and functions, focusing on carbon cycling, ecohydrology, and plant species distributions.