The Changes in the Composition of the Diatom Assemblages Found in the Surface Sediments of Blelham Tarn in the English Lake District During 1973

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Abstract
A study has been made of the accumulation of diatom frustules in the surface layers of lake sediments, taking advantage of the appearance of a new diatom bloom in Blelham Tarn in the English Lake District. Results from monitoring the top 5 cm of sediment and seston trap material, and comparison with phytoplankton records show that there is good agreement between all three and that sediment diatom assemblages change in response to the living populations so that the record of large ‘blooms’ can be quickly diluted. The centric diatom, Stephanodiscus astraea var. minutula appeared to sink out of the phytoplankton quickly and mix down into older sediments fairly readily, circumstances which may be assisted by the compact shape of its frustule.

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