Abstract
Changes in the buoyancy of Planktothrix agardhii populations were followed over a 24-h period in shallow fishpond Bila Lhota (Central Moravia, Czech Republic). The selected environmental variables (pH, oxygen, temperature, conductivity, nutrients, light) were measured together with the Planktothrix abundances, biovolume and filament lengths. While the exchange of cyanobacterial biomass between the surface layers (0 and 50 cm under the surface) was evident, the bottom part of the population was relatively stable. Similarly, the hierarchical clustering analysis based on filament lengths showed that the bottom part of the population is significantly different.
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