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Abstract
Data from 66 cruises on Lake Ontario, sampling some 95 stations, were subjected to trend analysis. The data were reduced to monthly means and statistically significant (P≥0.01) decreases in total phosphorus (TP), chlorophyll a, and paniculate organic carbon (POC) were observed between 1974 and 1980. Seasonally corrected trend-in-time equations were formulated for the 17 zones established by the International Joint Commission for five commonly measured surveillance parameters (temperature, TP, chlorophyll a, POC, and chloride). In general, offshore areas produced seasonally corrected trend-in-time equations with higher coefficients than did nearshore areas, indicating that the offshore areas have been more stable during the historical period studied.
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