Abundance and structure of rotifer community in a humic Lake Smolak twenty years after the experimental mineral fertilisation

Abstract

Liming and supplying with N, P and K of a humic Lake Smolak carried out in 1971-1974 resulted in changes of abundance and composition of the rotifer community. The changes indicated eutrophication of the lake. Discontinuation of treatment caused further changes, which indicated olig- otrophication, although 20 years after the fertilisation high species diversity of Rotifera is still observed. The community is dominated by detritivorous species, typical of productive, alkaline waters. Also the number and biomass of rotifers remains high.