1. Decision Research; Galiano Island, 1160 Devina Drive BC V0N 1P0 Canada
2. Department of Geography; University of Calgary; Earth Science 448, 2500 University Drive Calgary Alberta T2N 1N4 Canada
3. Decision Research; 1201 Oak Street, Suite 200 Eugene OR 97401 U.S.A.
4. Ecology; Evolution and Environmental Science; School of Life Sciences; Arizona State University; Tempe AZ 85287-4501 U.S.A.