1. Department of Biology, Algoma University, Sault Ste. Marie, ON, Canada, P6B 2G4
2. Department of Integrative Biology, University of Guelph, Guelph, ON, Canada, N1G 2W1
3. Freie Universität Berlin, Institut für Biologie, Plant Ecology, Altensteinstr. 6, D‐14195 Berlin, Germany
4. Biology and Physical Geography Unit, I.K. Barber School of Arts and Sciences, The University of British Columbia – Okanagan, SCI 311 – 3333 University Way, Kelowna, BC, Canada, V1V 1V7
5. West Virginia University, Morgantown, WV 26506‐6108, USA