SummaryDiatoms provide evidence of lake conditions in the past. The pattern of change of the diatom content of lake sediments from North Wales is similar to that from the Lake District (Northern England). The early period is dominated by species of Fragilaria and Epithemia, while the more recent period has a dominance of Achnanthes, Anomoeoneis, Eunotia and Tabellaria. Changes in the diatom flora are related to changing water conditions and to changing habitats within the lakes.
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K Crabtree (1969) studied this question.
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