Acid rain containing high levels of sulfuric and nitric acids is also a serious threat to
many freshwater ecosystems, particularly lakes at high altitudes and latitudes. These
pollutants enter the air mainly through the burning of fossil fuels, are transported atmospherically
to distant parts of the globe, and are finally released into freshwater
ecosystems through precipitation. In lakes susceptible to acidification (where acids are
not readily neutralized by the soil or water), lake pH is lowered dramatically, and
species composition and abundance can change as a result (Schindler et al., 1985;
Wright and Schindler, 1995).
Acid rain containing high levels of sulfuric and nitric acids is also a serious threat tomany freshwater ecosystems, particularly lakes at high altitudes and latitudes. Thesepollutants enter the air mainly through the burning of fossil fuels, are transported atmosphericallyto distant parts of the globe, and are finally released into freshwaterecosystems through precipitation. In lakes susceptible to acidification (where acids arenot readily neutralized by the soil or water), lake pH is lowered dramatically, andspecies composition and abundance can change as a result (Schindler et al., 1985;Wright and Schindler, 1995).
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