Abstract
Ten major surveys of biological and chemical variables in Lake Erie were carried out during the 1970 shipping season. The observed distributions of temperature, turbidity, O2, soluble and particulate P, NO3 plus NO2, NH4, and soluble reactive silica are presented. Comment on the probable causes of the observed distribution patterns is included where appropriate. NH4 quantities in the lake remained almost unchanged throughout the year while NO3 plus NO2 quantities varied considerably. The ratio of particulate to total P showed very little seasonal change.

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