1. Department of Earth and Environmental Science, Acadia University, Wolfville, NS B4P 2R6, Canada
2. Department of Geography and Environmental Studies, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
3. Department of Biology, Acadia University, Wolfville, NS B4P 2R6, Canada
4. Nova Scotia Department of Natural Resources, P.O. Box 698, Halifax, NS B3J 2T9, Canada
5. Nova Scotia Provincial Office, Ducks Unlimited Canada, P.O. Box 430, Amherst, NS B4H 3Z5, Canada