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acid precipitation acidic lakes Adirondack Mountain Adirondack Park alkalinity aluminum aquatic plants bottom area covered CD CD classifying the plant CM CM community similarity concentrations confervoides Council Canada 1981 Dendrogram Dendrogram obtained depth zone Distribution of macrophytes dominant Eriocaulon septangulare Euclidean Distance geminiscapa Grahn Halvorsen 1977 Hellquist 1980 Herkimer County Hutchinson 1975 Isoetes spp Lake Colden Lake pH 4.8 Linthurst littoral Lobelia dortmanna Lyon Lake measure of community Muenscher Myriophyllum tenellum National Research Council Nilssen number of species Nuphar luteum obtained by classifying Ontario percent of bottom percent of total pH and alkalinity pH values phosphorus plant communities Pond pH 6.9 Potamogeton Proportional Similarity Research Council Canada samples sediment shallow water Sphagnum Sphagnum spp submersed survey Table Tollan total lake cover ueq/L Utricularia geminiscapa Utricularia purpurea Utricularia resupinata Utricularia spp watershed zone and percent