Department of Global Ecology, Carnegie Institution of Washington, 260 Panama Street, Stanford, CA 94305
Department of Global Ecology, Carnegie Institution of Washington, 260 Panama Street, Stanford, CA 94305
USDA Forest Service, International Institute of Tropical Forestry, International Institute of Tropical Forestry, San Juan, PR 00926 ; Complex Systems Research Center, Morse Hall University of New Hampshire, Durham, NH 03824
Department of Global Ecology, Carnegie Institution of Washington, 260 Panama Street, Stanford, CA 94305