Laurentian Great Lakes monitoring : biology and the Lake Erie case / Murray N. Charlton. : En13-5/99-209E-PDF

"Pollution increased until the late 1960s. At that time the public was shocked by a series of studies that showed that even these huge lakes could be seriously polluted by the population on the shores. Eutrophication symptoms were similar to those elsewhere: beach closings, objectionable algal accumulations, fish kills, and severe oxygen depletion in Lake Erie. Eventually, the Great Lakes Water Quality Agreement between Canada and the U.S. was signed in 1972. The agreement mandated eutrophication controls and monitoring as well as research. Subsequent versions of the agreement concentrated on toxic chemicals and residual highly contaminated areas. Monitoring or long term research has been used to assess the lakes and the effects of controls as well as to increase our understanding of the systems so that management decisions can be made on the basis of good information"--Abstract.

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