The goal of our studies was to determine the taxonomic composition of phytoplankton and physico-chemical water properties in selected lakes and reservoirs in Western Poland to estimate the influence of restoration measurements. Polimictic Maltański Reservoir (restored by means of phosphorus inactivation and biomanipulation) was characterized by increased concentrations of ammonium nitrogen as well as chlorophyll a (over 100 μg l⁻¹ in autumn 2011), related to cyanobacteria bloom. Slightly lower values of chlorophyll-a were noted in Sławskie Lake (ca. 42 μg l⁻¹, sewage inflow divertion), where organic nitrogen and orthophosphate content increased in time in analyzed season. Lowest concentrations of phosphorus were noted in Głębokie Lake (aeration and phosphorus inactivation), while a little bit higher were observed in polimictic Turawa Średnia Reservoir (also aeration and phosphorus inactivation). The latter water body was characterized by some increases in the abundance of cyanobacteria in warm months.
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