Paleolimnological evidence for the recent acidification of Llyn Hir,Dyfed, Wales |
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| Authors: | S. C. Fritz A. C. Stevenson S. T. Patrick P. G. Appleby F. Oldfield B. Rippey J. Natkanski R. W. Battarbee |
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| Affiliation: | (1) Limnological Research Center, University of Minnesota, 310 Pillsbury Drive S.E., 55455 Minneapolis, MN, USA;(2) Department of Geography, University of Newcastle upon Tyne, NE1 7RU Newcastle upon Tyne, UK;(3) Palaeoecology Research Unit, Department of Geography, University College London, 26 Bedford Way, WC1H OAP London, UK;(4) Department of Applied Mathematics & Theoretical Physics, University of Liverpool, P. O. Box 147, L69 3BX Liverpool, UK;(5) Department of Geography, University of Liverpool, P.O. Box 147, L69 3BX Liverpool, UK;(6) Freshwater Laboratory, University of Ulster, Traad Point, BT45 6LR Ballyronan, N. Ireland |
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| Abstract: | A variety of paleolimnological techniques, coupled with historical data on land-use and fisheries, are used to evaluate the magnitude, timing, and causes of acidification of Llyn Hir, a moorland lake in central Wales. pH reconstruction based on diatom analysis suggests a gradual decline in lakewater pH beginning ca. 1870 and intensifying in the mid-1930's, with a total decline of 1.1 pH units between 1870 and 1984. This pH decline correlates with increased sedimentary concentrations of carbonaceous particles, trace metals, and magnetic minerals, which indicate the local deposition of atmospherically transported products of fossil-fuel combustion. Pollen data and the historical record show no significant alterations in land-use or catchment vegetation, indicating that acidification of Llyn Hir is a result of the increased deposition of atmospheric pollutants, not of land-use and vegetation change.Limnological Research Center Contribution No. 374. |
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| Keywords: | acidification diatoms sediment chemistry magnetic stratigraphy soot paleolimnology Wales |
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