Abstract
Levels of acidic deposition have declined in Galloway over the last two decades. At the Round Loch of Glenhead this has led to a slight recovery from lake acidification, lake water pH rose by approximately 0·2 units between 1978 and 1989. The diatom flora of the lake has responded to this recovery and a clear floristic reversal dating to the late 1970s is apparent in the sediment cores studied. The detection of this reversibility trend, however, is dependent on the accumulation rate of individual cores. The trend could be detected only in cores with accumulation rates greater than 0·7 mm year −1. It is also argued that sediment mixing has led to some loss of resolution of the sedimentary record.
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