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The PIRLA project (paleoecological investigation of recent lake acidification): Preliminary results for the Adirondacks,New England,N. Great Lakes states,and N. Florida |
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| Authors: | Donald F. Charles Donald R. Whitehead Dennis S. Anderson Raymond Bienert Keith E. Camburn Robert B. Cook Thomas L. Crisman Ronald B. Davis Jesse Ford Brian D. Fry Ronald A. Hites Jeffrey S. Kahl John C. Kingston Russell G. Kreis Jr. Myron J. Mitchell Stephen A. Norton Linda A. Roll John P. Smol P. Roger Sweets Allen J. Uutala Jeffrey R. White Mark C. Whiting Robert J. Wise |
| Affiliation: | 1. Department of Biology, Indiana University, 47405, Bloomington, IN, USA 2. Department of Botany and Plant Pathology, University of Maine at Orono, 04469, Orono, ME, USA 3. Department of Environmental Engineering, University of Florida, 32611, Gainesville, FL, USA 4. Department of Geology, University of Minnesota, 55812, Duluth, MN, USA 5. Department of Geoscience, Indiana University of Pennsylvania, 15705, Indiana, PA, USA 6. Ecosystems Research Center, Cornell University, 14853, Ithaca, NY, USA 7. School of Public and Environmental Affairs and Department of Chemistry, Indiana University, 47405, Bloomington, IN, USA 8. Department of Geological Sciences, University of Maine at Orono, 04469, Orono, ME, USA 9. Department of Environmental and Forest Biology, SUNY College of Environmental Science and Forestry, 13210, Syracuse, NY, USA 10. Department of Biology, Queens University, K7L 3N6, Kingston, Ontario, Canada 11. Department of Botany and Plant Pathology, University of Maine at Orono, 04469, Orono, ME, USA |
| Abstract: | The PIRLA project is an interdisciplinary paleoecological study designed to provide reconstructions of the recent acidification histories of a representative set of lakes in four acid-sensitive regions in North America. We are trying to determine if lakes in the study regions have acidified, and if so, to what extent, over what time period and why. Sediment cores from 5 to 15 lakes in each region are being analyzed for several characteristics. Diatoms and chrysophytes are being used to reconstruct lakewater pH. Results for three Adirondack lakes with current pH of 4.8 to 5.0 indicate a decrease in pH beginning in the 1930's–1950's. Increased atmospheric deposition of strong acids appears to be the primary factor responsible for the pH decline. Two lakes (pH 4.4 and 4.7) in New England show clear evidence of acidification probably due to acidic deposition. Preliminary reconstructions for two lakes in Michigan (pH 4.4 and 5.6), one in Wisconsin (pH 5.3), and one in Minnesota (pH 6.8) suggest no recent pH decrease. For, the one Florida lake (pH 4.4) analyzed, inferred pH decreases by about 0.5 unit, beginning in the 1950s; the cause has not been determined. |
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