Paleolimnological evidence for the recent acidification of Llyn Hir, Dyfed, Wales

S. C. Fritz, A. C. Stevenson, S. T. Patrick, P. G. Appleby, F. Oldfield, B. Rippey, J. Natkanski, R. W. Battarbee

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)245-262
Number of pages18
JournalJournal of Paleolimnology
Issue number4
StatePublished - Dec 1989
Externally publishedYes


  • Wales
  • acidification
  • diatoms
  • magnetic stratigraphy
  • paleolimnology
  • sediment chemistry
  • soot

ASJC Scopus subject areas

  • Aquatic Science
  • Earth-Surface Processes


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