1. Environment Canada, Canadian Rivers Institute, Department of Biology, University of New Brunswick, P.O. Box 4400, Fredericton, New Brunswick, E3B 5A3, Canada
2. Environment Canada, Canada Centre for Inland Waters, 867 Lakeshore Road, Burlington, Ontario, L7R 4A6, Canada
3. Biodiversity Institute of Ontario, University of Guelph, 50 Stone Road East, Guelph, Ontario, N1G 2W1, Canada