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Abstract
The effect of liming on the benthic diatom community in three Welsh lakes has been followed over a period of years. The diatoms living on stones, macroscopic plants and sediments were sampled and the changes in dominance determined. Each lake prior to liming had a slightly different selection of acidobiontic species growing in waters of pH 4.0–5.0. After liming, changes were not immediately obvious but within three months dramatic changes were obvious in all the habitats with Achnanthes minutissima becoming dominant and other species having short growth periods. The pH in all the lakes was raised to circumneutral by the liming. The original diatom flora then gradually re-appeared as the effect of liming declined.