1. Canadian Rivers Institute and
Department of Biology, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada
2. Donald Danforth Plant Science Center, St Louis, Missouri, United States
3. Nautilus Environmental, Burnaby, British Columbia, Canada
4. Department of Biology, University of the Fraser Valley, 33844 King Road, Abbotsford,
British Columbia, Canada V2S 7M8