Ábrahám Levente: Vegyes tanulmányok - Natura Somogyiensis 3. (Kaposvár, 2002)

Körmendi Sándor - Lanszki József: A Duna-Dráva Nemzeti Park különböző vizes élőhelyeinek kvalitatív zooplankton vizsgálata I. Rotatoria fauna - Investigation of Zooplankton from different water bodies of Duna-Dráva National Park.I. Qualitative investigation of Rotatoria fauna.

22 NATURA SOMOGYIENSIS Investigation of Zooplankton from different water bodies of Duna-Dráva National Park.I. Qualitative investigation of Rotatoria fauna SÁNDOR KÖRMENDI & JÓZSEF LANSZKI There were found 75 Rotatoria taxons in the investigated water bodies of Duna-Dráva National Park (Dráva, Rinya, gravel pit lakes, dead arms, marsh, moor). Most of occured species are cosmopolitan, well-adaptable species of high ecological tolerance. Some rare rotatorian species occured, such as Brachionus diversicornis homoceros, Brachionus qudridentatus mehleni, Trichocerca vernalis. The number of taxons can be significantly increased by systematical research of the different habitats (for example benton, metaphyton).The number of species can be determined by different factors in the river (Dráva) and in the brook (Rinya) (for example water pollution, discharge fluctuations), that is why there can be extremely fluctuation of a number of taxons. Based on the occurence of the saprobic indicator species it can be ascertained that the eutrophication process speeds up in the gravel pit lakes and dead arms and leads to water quality problems because of different human effects (for example intensive fish stocking, fish nutrition, influent of different organic matter). The most significant purpose of the futher researches is to determine the changes of water quality of different water habitats by biomonitoring. Authors ' addresses: Sándor KÖRMENDI Dr. József LANSZKI University of Kaposvár H-7400 Kaposvár Po. Box 16. HUNGARY