Institution: | Center for Conservation Biology, Department of Biological Sciences, 371 Serra Mall, Stanford University, Stanford, CA 94305–5020, U.S.A.;Instituto de Ecología, Universidad Nacional Autónoma de México, Apartado Postal 70–275, México D.F. 04510, Mexico;Earth Observation Systems Laboratory, Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada |