Preliminary Studies of Quality Assessment of Aquatic Environments from Cluj Suburban Areas, Based on Some Invertebrates Bioindicators and Chemical Indicators

Abstract

"Systematic categories of invertebrates bioindicators correlated with some chemical parameters,were an effective way to characterize the quality of lotic (Someş River) and lentic (Lake Gilău) aquatic environment from Cluj-Napoca area. Invertebrate fauna was represented by species belonging to the following dominant systematic categories: Nematoda, Annelida, Crustacea and Insecta. This paper contains also some preliminary data on the bioindicators species belonging to Protozoa phylum. Dominant groups were crustaceans (the sampling points in Lake Gilău) and annelids (Somes River) and among species Gammarus pulex, Daphnia pulex, Tubifex tubifex. The fauna composition shows the β-α mesosaprobic character of the water, with an evolution from β mesosaprobity upstream the Cluj-Napoca city to polysaprobic downstream of the city. This aspect has been observed and analyzed according to chemical parameters (pH, TDS, ORP, EC, t) and indices of saprobity (relative cleanliness, state of relative pollution, the deficit of species, saprobiological index)."