Aquatic effects of acidic deposition by Timothy J Sullivan

By Timothy J Sullivan

"While now not an everyday information merchandise, acidic deposition continues to be a widespread factor for environmental managers and coverage makers. Emissions of sulfur and nitrogen from strength crops, commercial amenities, and motorcars - significant explanations of acidic deposition - nonetheless pour into the ambience each day. Aquatic results of Acidic Deposition summarizes and synthesizes significant developments in clinical research, Read more...

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It is unfortunate that many federal program managers fail to recognize the cumulative value of these long-term databases. With each monitoring program that is discontinued, we forever weaken our ability to make future assessments of the impacts of acidic deposition, climate change, and other anthropogenic or natural environmental stressors. 1 Historical Water Quality Assessment Techniques Historical Measurements Significant decreases in measured ANC or pH would provide the most direct evidence of acidification, but reliable historical data are seldom available (Schofield, 1982).

S. , 1990). , 1990a). The response of S in watersheds, and to a lesser extent its chronic effects on surface water quality, are now reasonably well understood. This understanding has been developed largely through the efforts of three large multidisciplinary research efforts: the Norwegian SNSF program (Acid Precipitation Effects on Forests and Fish, 1972–1980), NAPAP (1980–1990), and the British-Scandinavian Surface Water Acidification Program (SWAP 1984–1990). 2 Nitrogen The second important acid anion found in acidic deposition, in addition to sulfate, is nitrate.

0. 1). Biological effects on 20 Aquatic Effects of Acidic Deposition fish are better understood than are effects on other aquatic life forms, but it is clear that virtually the entire aquatic ecosystem is affected when acidification is pronounced. The most important chemical parameters that cause or contribute to the adverse effects of acidification on aquatic biota are decreased pH (increased H+), increased inorganic Al, and decreased Ca2+ concentrations. Different species and stages in the life history of a given species differ in their tolerance to variations in these three critical parameters.

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