Preliminary aspects regarding the use of some invertebrate bioindicator species in the ecological study of an aquatic lotic ecosystem.

"Using invertebrate bioindicator species is one of the most important methodologies for evaluating the quality of the environment. The paper presents some data about monitoring studies, made during 1985-2008, with reference to some invertebrate bioindicator species, in the Some?? River within the Cluj-Napoca city???s limits. A number of 16 systematic categories were highlighted. The results presented in this paper are the preliminary data for a wider study referring to the evolution of this aquatic ecosystem???s quality. On the other hand, the data show, for the studied period, a progressive increase of the level of the ecosystem???s aggression and pollution."