00000nam 2200000za 4500 9.867032 CaOODSP 20241203113645 cr ||||||||||| 190114s2001 onc #ot f|0| 0 eng d CaOODSP eng eng fre n-cn-on En13-5/01-177E-PDF Review of eutrophication and undesirable algae in Lake Erie [electronic resource] / Murray Charlton ... [et al.]. [Burlington, Ont.] : Environment Canada, [2001] [86] p. : figures. NWRI contribution ; no. 01-177 Digitized edition from print [produced by Environment and Climate Change Canada]. "Prepared for the Lake Erie LaMP, Preliminary Beneficial Use Impairment Assessment." "Technical Report 10." Includes bibliographic references. "Lake Erie still has impairment due toeutrophication and algae. Oxygen conditions are still low in the central basin bottom water in summer. Noxious filamentous algae still wash up on shores in the central and east basin. The west basin is experiencinga reoccurrence of bluegreen algae blooms which are producing hazardous toxins. Most rivers contain phosphorus well above guideline concentrations. Fish populations are degraded in impaired downstream sections of larger rivers. Large increases in the ratio of nitrogen to phosphorus have occurred in the lake since the beginning of phosphorus controls in the early 1970. Atmospheric loads, fertilisers, and municipal sources of nitrogen have not been controlled as much as phosphorus. The changing N:P ratio may have unforeseen effects on stimulating nuisance algae. Zebra mussels have tended to clear up the water near shores and this can allow more growth of macrophytes and attached algae not subject to the mussels’ grazing. Meanwhile, the water offshore has had good clarity for twenty years"--Abstract. Abstracts in French and English. gccst Lakes gccst Aquatic plants gccst Water management Charlton, Murray N. Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 01-177. (CaOODSP)9.844121 PDF 3.64 MB https://publications.gc.ca/collections/collection_2019/eccc/En13-5-01-177-eng.pdf