1 Yale University, 165 Prospect Street, New Haven, Connecticut 06520, USA.
2 Department of Ecology, Evolution and Behavior, University of Minnesota, 1987 Upper Buford Circle, St Paul, Minnesota 55108, USA.
3 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA.
4 National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, 735 State Street, Suite 300, Santa Barbara, California 93101, USA.
5 Department of Global Ecology, Carnegie Institution of Washington, 260 Panama Street, Stanford, California 94305, USA.
6 Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611, USA.
7 Max Planck Institute for Biogeochemistry, Hans-Knöll-Straße 10, 07745 Jena, Germany.
8 Department of Plant Sciences, University of California, Davis, 139 Veihmeyer Hall, Davis, California 95616, USA.
9 Harvard University, 26 Oxford Street, HMNH, Suite 43, Cambridge, Massachusetts 02138, USA.
10 University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
11 School of Geography, University of Brighton, 9 Old Court Close, Brighton BN1 8HF, UK.
12 Center for Spatial Technologies and Remote Sensing, University of California, Davis, 139 Veihmeyer Hall, Davis, California 95616, USA.