The authors investigated the effect of aquatic macrophytes on the quantity of bacterioplankton. Among the 7 species of aquatic macrophytes the most pronounced effect on bacterioplankton is exerted by Potamogeton crispus, causing a decrease in its quantity to 53.28%. Polygonum amphibium stimulates the growth of bacteria to 121.96%. Under the influence of macrophytes the spherical to cylindrical ratio changes from 1:1.31 (Lemna minor) to 1:2.07 (Potamogeton crispus).
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