L. Forró szerk.: Miscellanea Zoologica Hungarica 9. 1994 (Budapest, 1994)
Csányi, B.: The macrozoobenthon community of the Danube between Rajka and Budapest
detailed analysis of the impact on the flood plain is not the object of the present paper because only the problems of the main river are discussed here. Although, the problems of the flood protected area with high diversity of different former water bodies (old meanders, oxbows, marshlands, swamps, dead arms etc.) have to be mentioned. Conclusions The macroscopic invertebrate community of the upper Hungarian Danube was investigated during the last 6 years in order to reveal the faunal distribution of taxa along the river. Two different sampling methods (kicking and dredging) resulted in similar conclusions. The number of taxa is gradually increasing downstream to Budapest. On the bases of multivariate analysis, one identical section situated along the Szigetköz section of the river containing four sampling sites has very similar macrozoobenthon community, most probably due to similar, fast flowing conditions. Several data referring to the Danubian macrozoobenthon fauna are new, especially the results of the dredge samples from the profundal region of the river. References Bothár, A. (1966): Beiträge zur Kenntnis der Weichtierfauna der ungarischen Donau (Danubialia Hungarica XXXVI) - Opusc. zool. Budapest 6: 93-107. Csányi, B. (1989): Hidrobiológiái vizsgálatok a Szigetköz víztereiben. Makrozoobentosz (Hydrobiological investigations of the water-bodies of Szigetköz. The macrozoobenthos). - Műhely (Suppl.), MTA Földrajztudományi Kutató Intézet, Budapest. Csányi, B., Németh, J. & Gulyás, P. (1985): Vergleichende hydrobiologische Untersuchungen in dem Haupt- und Nebenarm der Donau bei Ásványráró in 1984. I. Gelöster Sauerstoffgehalt und photosyntetische Sauerstoffproduktion. - 25. Arbeitstagung der IAD, Bratislava/CSSR, Wissenschaftliche Kurzreferate, pp. 190-193. Cs. Bereczky, M. (1987): A Duna magyarországi felső szakaszának szaprobiológiai jellemzése egysejtű indikátor szervezetekkel (Saprobiological characterization of the upper Hungarian Danube using the Ciliata plankton. - In: T. Dvihally, Zs. (ed.): A kisaföldi Duna-szakasz ökológiája (Ecology of the Danube at the Kis-Alföld section). VE AB Veszprém, pp. 126-147. Furse, M.T., Moss, D, Wright, J.F. & Armitage, P.D. (1984): The influence of seasonal and taxonomic factors on the ordination and classification of running-water sites in Great Britain and on the prediction of their macro-invertebrate communities. - Freshwater Biology 14: 257-280. Göcsei, I. (1979): A Szigetköz természetföldrajza. (Geography of the Szigetköz). - Földrajzi Tanulmányok 16: 1-120. Gulyás, P. (1989): Rotatoria és Crustacea vizsgálatok a Szigetköz vízterciben (Investigations of Rotatoria and Crustacea plankton in the water bodies of Szigetköz). - Műhely (Suppl.), MTA Földrajztudományi Kutató Intézet, Budapest. Gulyás, P. (1991): Saprobiologische Untersuchungen in der Donaustrecke zwischen Strom-km 1848-1659 sowie in ihren Nebengewässern. - 29. Arbeitstagung der IAD, Kiev, II. Molod., pp. 146-150. Gulyás, P., Németh, J. & Csányi, B. (1991): Hydrobiologische Untersuchungen in den Donau-Nebenarmen der Kleinen Schüttinsel (Szigetköz). - Öko-text 5: 239-258. Holcik, J., Brastl, I., Ertl, M. & Vranovsky M. (1981); Hydrobiology and ichthyology of the Czechoslovak Danube in relation to predicted changes after the constmction of the Gabcikovo-Nagymaros River Barrage System. - Práce Laboratória Rybarstva a Hydrobiológia 3: 19-158.
