Gravenhurst Bay, part of a soft-water lake system in Ontario's Precambrian Shield has been affected by phosphorus loadings of 2.37 g P/m 2 /yr, resulting mainly from municipal sewage discharges. In August of 1971, improved treatment at waste treatment plants reduced the loading of phosphorus to 0.40 g P/m 2 /yr. Since that time there have been a number of limnological responses toward improved water quality.
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Michalski et al. (1975) studied this question.
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