00000nam 2200000zi 4500 9.868953 CaOODSP 20241203113646 m o d f cr ||||||||||| 190227s1987 oncbd #ob f100 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn-on En13-5/87-104E-PDF Rao, S. S. (Salem S.), 1934- author. Microbiological studies of lake acidification : toxicological implications / by Salem S. Rao, B. Kent Burnison and Jerome O. Nriagu. Burlington, Ontario : National Water Research Institute, Canada Centre for Inland Waters, River Research Branch, Lakes Research Branch, [1987] 1 online resource (15 pages) : maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 87-104 Title from cover. "RRB-87-18"--Cover. "Presented as an invited special lecture at the International Conference on Reservoir Limnology and Water Quality, June 15-20, 1987, Czechoslovakia, which was organized by the Czech. Academy of Science"--Cover. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "Bacteriological and biogeochemical data collected for water and sediment cores from some Ontario lakes receiving acidic deposition indicate that bacterial populations and activities can be diminished by 20-30% under acidic populations. Bacterial biodegradation of organic material in acid stressed enviroments was approximately 30% less than those from non-stressed enviroments. The decrease in the rate of organic matter degradation might explain the relatively high organic content at the surface sediments of lakes receiving acid precipitation. This suggests that recalcitrant materials found in these ecosystems probably persist for longer periods of time and this could have adverse effects on the overall trophic level in the ecosystem. In addition, atmospheric fallout results in increased loading of pollutant metals that are toxic to biological communities. Measurements such as direct counts of total and respiring bacteria, heterotrophic plate counts, nitrifying and sulfur cycle bacteria, microbial activities, (02 consumption rates and organic substrate utilization), physiology, and trace metal concentrations will be presented, and some implications of the studies discussed"--Abstract. Includes a management perspective and an abstract in English and French. gccst Lakes gccst Acid rain gccst Pollutants Burnison, B. K., author. Nriagu, Jerome O., 1942- author. Canada. Environment Canada. National Water Research Institute (Canada). Rivers Research Branch. National Water Research Institute (Canada). Lakes Research Branch. Canada Centre for Inland Waters. NWRI contribution ; 87-104. (CaOODSP)9.844121 PDF 1.67 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-87-104-eng.pdf