Artificial small water reservoirs existing over peatbogs of Łęczyńsko-Włodawskie Lakeland have high ecological value. Planktonie rotifer communities of the reservoirs are characterized by high species diversity, presence of rare species as well as high abundance of periphytic and benthic-pcriphytic forms. Low nutrients concentrations of studied reservoirs confirmed low total rotifers density, presence of indicatory species and high ratio of algaevorous to detritivorous species. The analysis of domination structure of planktonie rotifers showed very low stability of their community and high vulnerability for changes of habitat conditions.