Dean S. Jeffries,^* Thomas A. Clair,^** Suzanne Couture,^*** Peter J. Dillon,^**** Jacques Dupont,^***** Wendel (Bill) Keller,^****** Donald K. McNicol,^******* Michael A. Turner,^******** Robert Vet,^********* Russell Weeber<sup>**********


*</sup>Dean Jeffries is a research scientist at the National Water Research Institute of Environment Canada. His research focuses on assessing the aquatic effects of acidic deposition and the biogeochemical factors that control them. His address: Aquatic Ecosystems Impacts Research Branch, P.O. Box 5050, Burlington, Ontario, Canada L7R4A6. dean.jeffries@ec.gc.ca
^**Thomas Clair is a research scientist for the Atlantic Region of Environment Canada. He is a geochemist interested in freshwater dissolved organic carbon and its interactions with other chemical and catchment components. His address: Environmental Conservation Branch, Sackville, New Brunswick, Canada E4L1G6. tom.clair@ec.gc.ca
^***Suzanne Couture is Project Chief of the acid rain program for the Quebec Region of Environment Canada. She is in charge of monitoring activities conducted within the Quebec lake network as part of the national acid rain program. Her address: St. Lawrence Centre, 105 McGill Street, Montreal, Quebec, Canada H2Y2E7. suzanne.couture@ec.gc.ca
^****Peter Dillon is professor and NSERC Industrial Chair in the Department of Environmental and Resource Studies, Trent University. His research concentrates on nutrient dynamics and modelling, acidification of lakes and streams, and trace metal dynamics. His address: Trent University, Peterborough, Ontario, Canada K9J7B8. pdillon@trentu.ca
^*****Jacques Dupont is Department Head of the Aquatic Environment Information Service in Environment Quebec. He is a specialist in limnology and acid rain issues and active in acid rain initiatives of the Conference of New England Governors and Eastern Canadian Premiers. His address: 675 East Rene-Levesque Boulevard, 7th Floor, Quebec, Quebec, Canada G1R5V7. jacques.dupont@menv.gouv.qc.ca
^******Bill Keller is the senior environmental scientist (Northern Lakes) with the Ontario Ministry of Environment and 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 effects of multiple stressors on lakes and lake recovery. His address: Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6. bkeller@vianet.on.ca
^*******Don McNicol is Head of Integrated Programs with the Canadian Wildlife Service of Environment Canada. His research focuses on the effects of acidic precipitation on food webs and higher trophic levels in aquatic ecosystems, and particularly waterbirds in Ontario. His address: CWS - Ontario Region, 49 Camelot Drive, Ottawa, Ontario, Canada K1A0H3. don.mcnicol@ec.gc.ca
^********Michael Turner is a limnologist at the Experimental Lakes Area with the Department of Fisheries and Oceans. His research areas include recovery from acidification, littoral limnology, and impacts of climate variability and change. His address: Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, Canada R3T2N6. TurnerMi@dfo-mpo.gc.ca
^*********Robert Vet is an atmospheric scientist in charge of the management, quality assurance and analysis of data from Canada's national acid deposition monitoring network. His research focuses on the temporal and spatial variability of wet deposition across North America. His address: Meteorological Service of Canada, 4905 Dufferin Street, Toronto, Ontario, Canada M3H 5T4. Robert.Vet@ec.gc.ca
^**********Russell Weeber is an acid rain biologist with the Canadian Wildlife Service of Environment Canada. His research concentrates on the response of aquatic food webs and wildlife to the acidification and recovery of Ontario lakes and wetlands. His address: CWS - Ontario Region, 49 Camelot Drive, Ottawa, Ontario, Canada, K1A0H3. russ.weeber@ec.gc.ca