1. Department of Biology, Boise State University, Boise, Idaho 83725, Microbial Ecology Program, Division of Biological Sciences, The University of Montana, Missoula Montana 59812, Geology Department, The University of Montana, Missoula Montana 59812, Institut für Biologie, Plant Ecology, Freie Universität Berlin, Berlin, Germany, School of Oceanography, University of Washington, Box 357940, Seattle, Washington 98195-7940, and Montana—Ecology of Infectious Diseases Program, The University of Montana,...