Lake Erie central basin total phosphorus trend analysis from 1968 to 1982 / by Fernando Rosa. : En13-5/85-101E-PDF

"Cultural eutrophication in Lake Erie and the other Great Lakes has been attributed to an increase in the in-lake phosphorus concentrations, due to increasing lake loadings. The Great Lakes Water Quality Agreement (GLWQA) was signed in 1972 to reduce nutrient loadings to the Great Lakes. The Lake Erie Central Basin total phosphorus data from 1968 to 1982 was analyzed to determine the in-lake response to the GLWA phosphorus loading reductions. The data set for each year was subdivided into five different subsets according to time of year, and according to the water column segmentation. The in-lake total phosphorus concentrations in all five data subsets showed a significant decline (P < 0.01). This study has conclusively shown that both the phosphorus loadings to Lake Erie, and the in-lake concentrations have been decreasing at a rate of 1010 metric tonnes per year, and 0.56 mg.m-3yr-1, respectively, over the time period covered by the study"--Exec. summary.

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