Abstract
Diatom analysis of the recent sediments of an acid lake in Galloway, southwest Scotland, suggests that there was an increase in lake water pH following the ploughing of catchment soils in 1961 before conifer plantation. It is argued that the increase is an artifact resulting from the erosion and transfer of soils containing mainly nonacidobiontic diatoms to the sediments and the consequent depression of autochthonous acidobiontic taxa in the percentage diatom counts. This interpretation is supported by the data for diatom accumulation rates which indicate no decrease in the accumulation rates of the acidobiontic taxa over this period.
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