1. Division of Biology, Ackert Hall, Kansas State University, Manhattan, Kansas 66506 USA
2. Landcare Research, PO Box 69, Lincoln 8152, New Zealand
3. Department of Fisheries and Wildlife, Oregon State University, Corvallis, Oregon 97331 USA
4. Department of Zoology, Arizona State University, Tempe, Arizona 85287-1501 USA
5. Kellogg Biological Station, 3700 E. Gull Lake Dr., Hickory Corners, Michigan 49060 USA
6. Department of Biology, University of North Carolina Greensboro, Greensboro, North Carolina 27402 USA
7. Centre d’Estudis Avancats deBlanes, Cami de Sta. Barabara s/n, 17300 Blances, Girona, Spain
8. Department of Natural Resources, James Hall, University of New Hampshire, Durham, New Hampshire 03824 USA
9. Institute of Ecology, University of Georgia, Athens, Georgia 30602-2602 USA
10. The Proctor and Gamble Company, Experimental Stream Facility, 1003 Route 50, Milford, Ohio 45150 USA
11. Environmental Science Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6036 USA
12. Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543 USA
13. Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556-0396 USA
14. Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virgina 24061 USA