00000nam 2200000za 4500 9.848542 CaOODSP 20241203113640 cr ||||||||||| 171211s1985 onca|||fob|||f000 0 eng d CaOODSP eng eng fre n-cn-on x6x8 En13-5/85-101E-PDF Rosa, Fernando. Lake Erie central basin total phosphorus trend analysis from 1968 to 1982 [electronic resource] / by Fernando Rosa. Burlington, Ont. : Aquatic Ecology Division, National Water Research Institute, [1985]. 13, [3] p. : ill. NWRI contribution ; 85-101 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references: p. 11-13. "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. Includes executive summary and abstract in French. gccst Water quality gccst Water pollution gccst Statistical analysis trend study area re-suspension anoxic regeneration epilimnion Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 85-101 (CaOODSP)9.844121 PDF 1.16 MB https://publications.gc.ca/collections/collection_2017/eccc/En13-5-85-101-eng.pdf