Macrozoobenthos as an Indicator of the Level of the Trophy and Saprobit,y of Lake JarrunSun, / I I ( L T~: During complex ecological investigations on La,lie Jiwiin (and neighbouring interst,itial underground \vat,ers) which took place in 1984 and 1985, niacrozoobenthos was also studied. I t s qualitative and quantitativr composition in a lmge part deprnds 011 the degree of t,rophy and saprobity of the water. Specially examined mere the oligochnetes and chironomids larvae, which besides having R large numerical perceiit.agr also occurred with R large number of species. I n addition, t,he representatives of other groups of macroscopic invertebrat'es mere also mentioned, especially those which have a special significance as indicators of a certain degree of trophy and saprobity, and which are important because of their oasis preservation in this ecosystem.

SUMMARYThis paper describes investigations of fundamental biological and pratical importance. Interstitial subterranean water (hyporheic) which is near a polluted river in a plain is the subject of the study. The water is becoming increasingly important as a source of drinking water. The relation of the hyporheic water to the physical. chemical. bacteriological and faunistic characteristics of the river is discussed.

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La d:rnamique de population de I'lsopode Proasellus slavus ssp.n.

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