EN
The study revealed an impoverishment of the planktonic community in water bodies of the Krakow region (Borek Falecki).The results compared with data obtained from 1959-1966 in the same area.Areduction in the number of taxa, especially ciliates, can now be observed.Paramecium novaurelia was the only species noted among the four species of the P.aurelia complex previously found in this area.