A reservoir for drinking water supply was studied at 10 day intervals for one season. Changes in bacterial microscopic counts and chlorophyll and algal biomass showed a similar pattern. Bacterial peaks usually lagged slightly behind the algal maxima. Average volumes of bacterial cells, corrected for shrinkage, were mostly lower than 0.2 μm 3 . The average concentration of bacterial C in water was estimated to be 18 μg μg 1 −1 (from a volume biomass of 0.09 mm 3 per litre). Several years' fluctuations in bacterial numbers were compared with hydrological data and phyto‐ and zooplankton changes.
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Straškrabová et al. (1979) studied this question.