Cyanobacteria are a constant component of phytoplankton of lakes with different trophic status including lakes representing habitat 3140 Hard oligo-mesotrophic waters with benthic vegetation of Chara spp. In an article in Ecological Indicators Aleksandra Pełechata, Mariusz Pełechaty (Department of Hydrobiology) and Andrzej Pukacz (Polish-German Research Institute, Collegium Polonicum) compared the cyanobacteria community structure of four Chara-lakes: two small, mid-forest lakes with little recreational use and two large under considerable anthropogenic pressure. Small mid-forest Chara-lakes were distinguished by Chroococcales taxa, while Oscillatoriales and Nostocales preferred large recreationally used water bodies with catchment areas changed by human activity. The dominance of cyanobacteria was only detected in the two large Chara-lakes characterised by a worse ecological status compared to the small mid-forest ones.