Hidrológiai Közlöny 2001 (81. évfolyam)

5-6. szám - XLII. Hidrobiológus Napok: „A magyar hidrobiológia időszerű kérdései az ezredfordulón” Tihany, 2000. október 4–6.

464. HIDROLÓGIAI KÖZLÖNY 2001. 81. ÉVF. 5-6. SZ. Stiller J. (1939): Eine neue Gattung der Ordnung Peritricha, Geleilla vagans gen. n. sp. n. - Acta Biol. 5: 53-56. Stiller J. (1963): Zur Limnologie der Natrongewässer Ungars. I Der Natronsee Nagyszék und seine Peritrichen Fauna. - Int. Rev Ges. Hydrobiol. 48:603-612. Stiller J. (1971): Szájkoszorús csillósok.- Peritricha.- Fauna Hung. 105. Akad. Kiad. Bp. Stiller J. (1974): Járólábacskás csillósok - Hypotrichida- Fauna Hung. 115. Akad. Kiad. Bp. Szabó A. (1983): Összehasonlító mikrofaunisztikai vizsgálatok a HNP különböző sziki Növénytársulásaiban. DATE. Tud. Közi. 23: 91-108. Szabó A. (1986): Újabb adatok a szikes ökoszisztémák csillós faunájához. - Tessedik S. Tiszántúli Mg. Tud. Napok.. Stud. Univ. Sei. Agr. Debrecen. 117. Szabó A. (1999): Protozoológiai kutatások a HNP szikes biotópjaiban I. A vízi élőhelyek Ciliata faunája. - Acta Biol. Debr. Oecol. Hung 9: 219-241 Szabó A. (1999): Protozoológiai kutatások a HNP szikes biotópjaiban. II. A szikes talajok Ciliata faunája. - Acta Biol. Debr. Oecol. Hung. 9: 243-256. Szabó A. - Wilbert N. (1987): Adatok a Laurentiella acuminata Fedr et. al. magyarországi előfordulásához és ökológiájához- DATE. Tud. Közi. 27: 439-451. Szabó A. - Wilbert N. (1995): Redescription of the Morphology of Onychodromus grandis Stein 1859 and the Systematic Implications of its Morphogenesis. - J. Euk. Microbiol. 42(1): 50-60. Protozoological (Ciliata) study of salinised small water bodies in the Kiskunság National Park András Szabó, Debrecen University, Agricultural Centre, H-4032. Böszörményi str. 13, Debrecen Our studies were performed in the astatic and semistatic waters of chloride character in the Kiskunság National Park (KNP, Hungary). Small water bodies analysed on the area of the KNP except for the sampling site Kisrét - are very alkaline with high salt content and have stable ion composition throughout the year They are of Na-HC0

3-Cl character and a slippery sense of touch, due to the presence of C0

3 ions and their high Na-content. Their depth is usually 20-50 cm and they are opalescent except for the waters of Kisrét. The activity of algae is low in the waters studied, they are usually oligo- or ultra* oligotrophic, rarely mesotrophic. Results demonstrate that the chemical character of these waters influences species diversity as well as the S/G ratio. There were many cosmopolitan species of wide ecological tolerance spectrum found in the small salinised water bodies. The number of species tends to decrease parallel with the increase of the salt content and pH The number of Ciliata species found was 37 at the Kisrét, 13 at the Zabszék, 12 at the Fehér-szék, 18 at the Kelemen-szék and 8 at the Böddi-szék sampling site. On the other hand, parallel with the increase of the salt content the number of species tolerating or preferring the salinised environment (Epistylis halophila, E. microdiscum, Uronema marirtum, Hemiophrys fusidens, Vorticella difficilis, Hastatella radians, Astylozoon fallax, A. vagans, Mycterotrix ovata, Metastrombidium sp.) has also increased. Proportion of such species at Kisrét was extremely low (1-2 %), while at Zab-szék 18 %, at Fehér-szék 40 %, at Kelemen-szék 50 %. In the water of Böddi-szék 90% of the Ciliata fauna belonged to species tolerating or preferring the salty, salinised environment. Comparing these results with the Ciliata fauna living in the small salinised waters of chloride character (Zámpuszta) of the Hortobágy National Park (HNP), there are remarkable differences in the quantity and quality of species as well. In the similar waters of the HNP 69 Ciliata species were found, of which there are only 29 common ones with that of the KNP. As it has been proven by earlier (1992) studies 30-32 % of Ciliata species in the small water bodies of the KNP were preferring alkaline environment, while this figure was found to be only 18-20 % in the case of the HNP. The recent study has found this value in the salinised waters of chloride character to be 50-90 % in the case of the KNP, and 35-50 % in HNP. This can be explained by the differences in the ecological character of the two areas studied. Small water bodies of Zám-puszta, accumulating in the micro-geomorphologically deeper, barren areas are found on different subtypes of solonetz soils, thus their water is usually neutral or slightly alkaline (pH: 7.3-8.6). Conductivity values are relatively low (470-900 pS/cm) becoming only higher (up to 2000-5800 pS/cm) during the concentration process The water character is mainly Na-HC0

3-Cl at Zámpuszta. Protozoological research of small alkaline bodies may arouse interest not only in Hungary but abroad as well, hence these biotopes are unique in Europe, or perhaps all over the world.