In 2007, aquatic ecosystem scientists everywhere were saddened by the passing of two titans of limnology: Dr. Richard A. Vollenweider (January 20, Burlington) and Dr. John (Jack) R. Vallentyne (June 16, Hamilton). It is fitting that the Aquatic Ecosystem Health and Management Society (AEHMS) publish this joint memorial issue. Both scientists made vanguard contributions to resolving the challenge of eutrophication in freshwaters and to establishing the ecosystem approach to management. Jack published The Algal Bowl: Lakes and Man (1974), effectively promoting the rationale and campaign for phosphorus abatement and neutralizing vested opposition. Richard developed his famous phosphorus loading models with their links to primary production and algal biomass, allowing abatement targets to be established. Both worked at the Canada Centre for Inland Waters (CCIW) in Burlington, Ontario. Indeed, it was Jack, along with Wally Johnson, who lured Richard to the Great Lakes to lead the first lake-wide biological investigations of...

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