1. Graduate Group in Ecology; University of California; Davis, One Shields Avenue; Davis CA 95616 U.S.A.
2. Department of Anthropology; Graduate Group in Ecology and Center for Population Biology; University of California; Davis One Shields Avenue, Davis CA 95616 U.S.A.
3. Center for Spatial Technologies and Remote Sensing, University of California, Davis; Department LAWR, One Shields Avenue, Davis; CA 95616 U.S.A.
4. CSIC, Global Ecology Unit; CREAF-CEAB-CSIC-UAB, Cerdanyola del Vallès 08193 Barcelona Catalonia Spain
5. CREAF, Cerdanyola del Vallès; 08193 Barcelona Catalonia Spain