DAVID L. PETERSON is a research biologist at the U.S. Geological Servey Biological Resources Division and Survey and professor at the College of Forest Resources at the University of Washington. He is coeditor with D. R. Johnson of Human Ecology and Climate Change: People and Resources in the Far North, and with C. V. Climas of The Role of Restoration in Ecosystem Management.V. THOMAS PARKER is professor of biology at San Francisco State University. He is coeditor, with M. A. Leck, and R. L. Simpson of Ecology of Soil Seed Banks.