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- W199695770 abstract "Three case studies that deal with the recovery of aquatic ecosystems from acidic stress are presented. These studies include (1) the experimental acidification and partial recovery of Lake 223 in the Experimental Lakes Area (ELA) of northwestern Ontario, (2) the recovery of two severely acidified and metal-contaminated lakes near the now-closed Coniston Smelter in Ontario, and (3) the recovery of moderately acidified lakes in the Sudbury region of Ontario following regional reductions of S02 emissions. All of these studies indicate that lake water quality improves rapidly once acidic inputs are reduced. Improvements include an increase in pH, a decrease in S04 concentrations, and a decrease in concentrations of trace metals. Rapid recovery is attributed primarily to in situ alkalinity production (bacterial S04 and N03 reduction) and to the natural flushing of lakes. Geological weathering within the drainage basin in areas of base-poor bedrock is not an important source of lake alkalinity. Improvements in water quality are followed by changes in biota. New species may invade unoccupied niches, and rare species may become more abundant when their natural predators and competitors are eliminated or when their food supply increases. Rapidly reproducing species, such as rotifers and phytoplankton, are among the first to become better established in lakes recovering from acidification. Amphibians and fish become more abundant once the pH is sufficiently high to allow them to reproduce successfully. However, information about biological recovery is still insufficient to enable us to determine to what extent and at what rate the biota do recover naturally following reductions of acidic and trace metal inputs." @default.
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- W199695770 date "1990-01-01" @default.
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- W199695770 title "Recovery of Acidified and Metal-Contaminated Lakes in Canada" @default.
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- W199695770 doi "https://doi.org/10.1007/978-1-4612-4456-1_7" @default.
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