MACROZOOBENTHOS OF THE POLLUTED REGULATED SECTION OF UPPER STRETCH OF THE MYJAVA']JAVA RIVER

The results of the research of the influence of communal and galvanic polluted waters upon the macrozoobenthos of a regulated stretch of the Myjava river (Slovakia) are presented. The species richness of the zoobenthos is not correlated with the dissolved O2 concentration, but it reflects rather well the irregular galvanic waste pollution from a factory. The correspondence of the overall municipal pollution to the species richness pattern was ascertained as well. Gammarus pulex fosarum and Prodiamesa olivacea are the most abundant taxa at a nonpolluted locality. Tubificidae and Cricotopus gr. bicinctus dominate polluted sites. The combined galvanic and communal pollution drastically lowered the Chironomidae (Oligochaeta ratio).