ANDREW J. HANSEN,^* RONALD P. NEILSON,^** VIRGINIA H. DALE,^*** CURTIS H. FLATHER,^**** LOUIS R. IVERSON,^***** DAVID J. CURRIE,^****** SARAH SHAFER,^******* ROSAMONDE COOK,^******** PATRICK J. BARTLEIN<sup>*********


*</sup>Andrew J. Hansen (hansen@gemini.oscs.montana.edu) is an assistant professor in the Ecology Department at Montana State University, Bozeman, MT 59717.
^**Ronald P. Neilson is a bioclimatologist with the USDA Forest Service, 3200 S.W. Jefferson Way, Corvallis, Oregon 97331.
^***Virginia H. Dale is a senior scientist in the Environmental Sciences Division at Oak Ridge National Laboratory, Oak Ridge, TN 37831.
^****Curtis H. Flather is a research wildlife biologist, with the USDA Forest Service, Rocky Mountain Research Station, 2150 Center Ave., Bldg A, Fort Collins, CO 80526–1891.
^*****Louis Iverson is a research landscape ecologist, USDA Forest Service, Northeastern Research Station, 359 Main Road, Delaware, OH 43066.
^******David J. Currie is professor and chair of the Biology Department at the University of Ottawa, University of Ottawa, Box 450, Station A, Ottawa, Ontario, K1N 6N5.
^*******Sarah Shafer, now a research geologist with the US Geological Survey Earth Surface Team, Denver, CO 80225, was a research associate in the Department of Geography at the University of Oregon while this article was being prepared.
^********Rosamonde Cook is a postdoctoral research associate, with the USDA Forest Service, Rocky Mountain Research Station, 2150 Center Ave., Bldg A, Fort Collins, CO 80526–1891.
^*********Patrick J. Bartlein is a Professor in the Department of Geography at University of Oregon, Eugene OR, 97403-1251.