Assessment of the surface water quality in the whole Europe affected the Directive 2000/60/ECof the waters, according to which is the evaluation method of surface waters based on the the evaluationof the ecological and chemical status of the surface water bodies. For environmental assessment are keyinformations on the qualitative and quantitative composition of communities aquatic organisms. On thisbasis, we collected 28 samples of water flow at 7 sites Caradice brook during year 2009, in thesouthwestern part of the Slovak Republic. In the water flow Čaradice stream, which spring in themountain of Pohronský Inovec and is righthand tributary of the Hron River, thus we obtained 30 776individuals macrozoobenthos. By determining the mentioned number of the individuals, we found thepresence of 146 kinds that were included into 16 systematic groups: Turbellaria, Oligochaeta, Hirudinea,Gastropoda, Bivalvia, Isopoda, Amphipoda, Ephemeroptera, Plecoptera, Odonata, Heteroptera,Megaloptera, Coleoptera, Trichoptera, Diptera, Chironomidae. From these systematic groups the largestnumber of representatives of the systematic group Amphipoda had regularly occurred at all samplingsites. Most widespread type of this systematic group and also the most numerous of all species ofmacroinvertebrate found in the waters of the Caradice stream was Gammarus fossarum, which we regardto its mass occurrence (28%) identified as eudominant species. The smallest numerous individuals wererepresented systematic group Megaloptera that monitored the water flow occurred infrequently, so weincluded them to subrecedent species. The greatest constancy, i.e. stability of in the community hadspecies Eiseniella tetraedra, Gammarus fossarum, Pisidium obtusale, which we evaluated as the speciesalways present. The species of Cloeon dipterum, Erpobdella octoculata, Hydropsyche angustipennis wasspecies the almost always present. The greatest frequency had family Chironomidae (100%). TheSaprobic indices in the reporting period ranged from 1.7151 to 2.2399 on the basis of what wecategorized the water from Caradice stream to the level of beta - mesosaprobity. The average annualvalue of the saprobic index of benthic invertebrates of Čaradice brook (SAS=2,00) does not meet therequirements of the indicator of water quality - Part E "biological and microbiological parameters,which are set out in Government Regulation No. 269/2010 Coll. (SAS = 1,3).

biodiversity, Čaradice stream, quality of water, macrozoobenthos, Slovak Republic

Presentation: oral