Norman D. Yan,^* Brian Leung,^** Wendel (Bill) Keller,^*** Shelley E. Arnott,^**** John M. Gunn,^***** Gunnar G. Raddum<sup>******


*</sup>Norman Yan is an associate professor at York University. He works in partnership with the Ontario Ministry of Environment's Dorset Environmental Science Centre. His research focuses on the impacts of multiple stressors on freshwater zooplankton. His address: Department of Biology, York University, 4700 Keele Street, Toronto, Ontario, Canada, M3J 1P3. nyan@yorku.ca
^**Brian Leung is a research assistant professor at the University of Notre Dame. His current research focuses on ecological forecasting and bioeconomic risk analysis of invasive species, using mathematical, computational, and statistical models. His address: Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556-0369, USA. bleung@nd.edu
^***Bill Keller is the senior environmental scientist – Northern Lakes, with the Ontario Ministry of Environment, and is an adjunct professor in the Department of Biology, Laurentian University. His studies focus on documenting and understanding the recovery process in damaged aquatic systems, and on investigating the combined effects of multiple stressors on lakes and on lake recovery. His address: Department of Biology, Laurentian University, Sudbury, Ontario, Canada, P3E 2C6. bkeller@vianet.on.ca
^****Shelley Arnott is an assistant professor in the Department of Biology at Queen's University. Her research focuses on determining the chemical and ecological factors that influence the recovery of aquatic biota from historical acidification in the face of climatic variability and the spread of nonindigenous species. Her address: Department of Biology, Queen's University, Kingston, Ontario, Canada, K7L 3N6. arnotts@biology.queensu.ca
^*****John Gunn is a fisheries research scientist with the Ontario Ministry of Natural Resources and heads up the Cooperative Freshwater Ecology Unit at Laurentian University. He specializes in restoration ecology of acid-damaged ecosystems as well as the ecology of salmonid fishes of Ontario. His address: Department of Biology, Laurentian University, Sudbury, Ontario, Canada, P3E 2C6. jgunn@nickel.laurentian.ca
^******Gunnar G. Raddum is an associate professor at the University of Bergen. He is Head of the unit: Laboratory for Freshwater Ecology and Inland Fisheries, Zoological Institute, UiB. His main interest is the effects of acidification, liming and restoration of freshwater ecosystems in general. His address: University of Bergen, Institute of Zoology, Allegt. 41, N-5007 Bergen, Norway. gunnar.raddum@zoo.uib.no