1. Dept of Environmental and Forest Biology; State Univ. of New York, College of Environmental Science and Forestry, Syracuse, NY, USA, and Roosevelt Wild Life Station, State Univ. of New York, College of Environmental Science and Forestry; Syracuse NY USA
2. Environmental and Life Sciences Graduate Program, Trent Univ.; Peterborough ON Canada
3. Centre for Mathematical Biology, Dept of Mathematical and Statistical Sciences and Dept of Biological Sciences, Univ. of Alberta; Edmonton AB Canada
4. Conservation Visions Inc., St. John's, Newfoundland and Labrador; Canada
5. School of Mathematics and Statistics, Univ. of Sheffield; Sheffield UK