1. Aquatic Ecosystem Management Research Branch; National Water Research Institute; Burlington ON Canada L7R 4A6
2. Department of Biology; McMaster University; Hamilton ON Canada L8S 4K1
3. Faculty of Health Sciences Electron Microscope Facility; McMaster University; Hamilton ON Canada L8N 3Z5
4. Department of Chemistry; Biology and Chemical Engineering, Ryerson University; Toronto ON Canada M5B 2K3