Bjørn Walseng,^* Norman D. Yan,^** Ann Kristin Schartau<sup>***


*</sup>Bjørn Walseng is a research ecologist at the Norwegian Institute of Nature Research (NINA). He focuses on the impacts of various ecological stressors on planktonic and littoral microcrustaceans (Cladocera and Copepoda) with special emphasis on their use as indicator organisms. Currently, he is working on the recovery of littoral microcrustacea from acidification in Norwegian and Canadian lakes. He is also running projects using crustaceans as indicators of water quality in agricultural landscapes. His address: Norwegian Institute of Nature Research (NINA), P.O. Box 736 Sentrum, N-0105 Oslo, Norway. bjorn.walseng@nina.no
^**Norman Yan is an associate professor in the biology department of York University, who works in partnership with the Ontario Ministry of the Environment's Dorset Environmental Science Centre. His research focuses on the influence of multiple ecological stressors on the zooplankton of Canadian Shield lakes. His address: York University, Department of Biology, 4700 Keele St., Toronto, Ontario, Canada M3J 1P3. yanno@ene.gov.on-ca
^***Ann Kristin L. Schartau is a scientist at the Norwegian Institute for Nature Research (NINA), Trondheim. Her research focuses on how freshwater biodiversity is related to environmental conditions with special emphasis on effects of pollution on the microcrustaceans. Her address: Norwegian Institute for Nature Research, Tungasletta 2, N-7485 Trondheim, Norway. ann.k.schartau@nina.no