L. Forró szerk.: Miscellanea Zoologica Hungarica 10. 1995 (Budapest, 1995)

Tittizer, T., Leuchs, H.; Banning, M.: The consequences of river impoundments for the macrozoobenthos - demonstrated at the example of the River Danube in Germany

Fig. 2. Sectional drawing of the Geisling impoundment Fig. 3. The mean velocity under low-flow conditions interrupted not only by the weir itself but also by the extreme reduction of flow velocity and by the accompanying changes in the structure of the river bed. The macro-zoocoenosis before the damming-up Before the construction of the impounding weir Geisling, the community was dominated especially in the 1960's and 1970's - by waste water-tolerating species. Water quality maps from 1950 to 1984 show this reach always in quality class III. Until 1977, during the winter