1. Department of Biology, University of Waterloo, Waterloo, ON, Canada N2L 3G1, Centre for Toxicology, University of Guelph, Guelph, ON, Canada N1G 2W1, Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1, National Water Research Institute, Environment Canada, Burlington, ON, Canada L7R 4A6, Wellington Laboratories, Guelph, ON, Canada N1G 3M5, and National Water Research Institute, Environment Canada, Saskatoon, SK, Canada S7N 3H5