1. Department of Landscape Architecture and Environmental Planning, University of California at Berkeley, 202 Wurster Hall, Berkeley, CA 94720, U.S.A.
2. Center for Environmental Design Research, University of California at Berkeley, 390 Wurster Hall, Berkeley, CA 94720, U.S.A.
3. Department of Environmental Policy, Science & Management, University of California at Berkeley, 137 Mulford Hall #3114, Berkeley, CA 94720, U.S.A.
4. Department of Biology, Duke University, Durham, North Carolina 27708, U.S.A.