Our study was undertaken to perform comparative analysis of five lakes in the area of the Promno Landscape Park: Brzostek, Dębiniec, Dobre, Kazanie, and Wójtostwo. The physico-chemical parameters of the lakes, including water temperature, chlorophyll-a, dry mass of seston, dissolved oxygen, pH, conductivity, visibility, nitrogen concentrations (ammonium, nitrate, and nitrite), and phosphorus (water-dissolved phosphates and total phosphorus) were measured.
The species composition, abundance, and biomass of phytoplanktonic organisms were studied in five lakes. Water samples were collected in summer 2007. The analysis exhibited extensive variability, both in respect to the number of taxa and phytoplankton abundance. The most numerous group of algae, in respect to the number of taxa, were green algae.