[1] Aquatic Ecosystem Protection Branch, National Water Research Institute, Burlington, Ont. L7R 4A6, Canada
[2] Department of Biology, McMaster University, Hamilton, Ont. L8S 4K1, Canada
[3] ICMA, University of Lausanne, BCH, 1015 Lausanne, Switzerland
[4] Department of Chemistry, McMaster University, Hamilton, Ont. L8S 4M1, Canada
[5] Pest Management Research Centre, Agriculture and Agri-Food Canada, Vineland Station, Ont. L0R 2E0, Canada
[6] Department of Biochemistry, McMaster University, Hamilton, Ont. L8S 3Z5, Canada