1. Assistant professor, Department of Biology, Indiana University, Bloomington 47405
2. Associate professor, Department of Biology, University of New Mexico, Albuquerque 87131
3. Associate professor, College of Forest Resources, University of Washington, Seattle 98195
4. Assistant scientist, The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543
5. Professor, Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755
6. Assistant professor, Department of Agronomy, University of Georgia, Athens 30601