1. Department of Biology University of Iowa 143 Biology Building Iowa City IA 52242 U.S.A.
2. Biology Department Mount Allison University Sackville NB E4L 1G7 Canada
3. Department of Biosciences University of Oslo Box 1066 Blindern 0316 Oslo Norway
4. Department of Integrative Biology Oklahoma State University 501 Life Sciences West Stillwater OK 74078 U.S.A.
5. Department of Biology, Program in Ecology and Evolutionary Biology University of Oklahoma 730 Van Vleet Oval, Room 304 Norman OK 73019 U.S.A.