1. Biotoxin Metrology, National Research Council Canada, 1411 Oxford Street, Halifax, Nova Scotia B3H 3Z1, Canada
2. Canadian Rivers Institute, University of New Brunswick, P.O. Box 4400, Fredericton, New Brunswick E3B 5A3, Canada
3. Department of Biology, University of New Brunswick, 10 Bailey Drive, Fredericton, New Brunswick E3B 5A3, Canada