Vízügyi Közlemények, 2004 (86. évfolyam)

3-4. füzet - Gulyás Pál: A rotatoria és curstacea plankton biodiverzitás monitorozása a Tiszabercel Balsa közötti Tisza szakaszon és holtágban

A Rotatoria és Crustacea plankton biodiverzitás monitorozása a ... 509 VITUKJ: A Szamos és a Tisza folyók romániai eredetű cianid- és nehézfém szennyezése által okozott természeti károk felmérésének harmadik szakasza (2001. június-december). Zárójelentés. Budapest. 1-103. 2002. Zsuga К:. Benthic entomostraca fauna of the Tisza and its tributaries. Tiscia (Szeged). 16:. 1981. Zsuga K.: A Kiskörei-tározó zooplanktonja. In: Bancsi I., Zsuga K. (szerk.): Komplex műszaki és biológiai eszközrendszer fejlesztése a Tisza-tó környezeti állapotának védelme és javítása érdekében. OMFB pályázati munka 1993. évi részeredményei. Szolnok. Kézirat.. 1994. Zsuga K. : Quantitative and qualitative changes of plankton structure in different reaches of River Tisza. In: Vermes L. (ed.): Investigations of environmental impacts on river basin and/or flood plain management. Proc. The 2nd International PhD Seminar. Budapest, Hungary. 5-8 July,. 1997. Zsuga К.-. Spatial Heterogeneity and Mosaic-Like Structure of Zooplankton in Kisköre Reservoir. -Internat. Rev. Hydrobiol. 83.. 1998. Zsuga K.-Bancsi I.: Biodiverzitás alakulása a Kiskörei-tározóban. In: Bíró, P. (szerk.): Biomonitorozás és biodiverzitás. Tihany. 1995. * * * Monitoring the biodiversity of Rotatoria and Crustacea planktons in the River Tisza and its oxbow lakes, along the river reach between Tiszabercel and Balsa by Pál GULYÁS professor of biology Development of the biodiversity monitoring programme of Hungary was launched in 1996. A pilot area was assigned for testing the biodiversity monitoring procedure on various elements of the biota. The Pilot area is the river reach between Tiszabercel and Balsa and its oxbow-lakes and other wetlands (Figure 1) The groups of the biota selected for the analysis were the Cladocera, the Copepods and the Rotatoria. The species list presented in Table I shows the results of the qualitative and quantitative analyses carried out in the years 1996, 2000 and 2001. The series of investigations made in the year 2000 were justified by the cyanide and heavy metal pollution accidents in the Romanian parts of the catchment in January and March, 2000. These investigations were completed in 2001 with the determination of the stock of planktonic Rotatoria. The investigations revealed the presence of a total of 108 species of Rotatoria and Crustacea, as shown in Table I. The number of species that were found in both before and after the cyanide catastrophe was 34. In 1996 we identified 14 such species that have not been found in the later investigations. However in 2000 and 2001 we found 10 new species, which had not been detected in the earlier analyses. The summary list of species is given in Tables II and III and it can be seen that actually the total number of species have not changed much, but the species composition was substantially altered in 2000. The dominant species remained the same but the so-called auxiliary ones were partially replaced by others. Namely, some of them were not found in the past two years. Evaluating the results of the investigations of 1996 we may state that the species composition of Cladocera was much richer than that of the Copepods and some rare species had also been registered. These were found mainly in shallow wetlands (Lake János, the Dead Tisza of MarótZug and Lake Kacsa) with lasting low water state. For example in the River Tisza a mass production of Bosmina longirostris was observed at Tiszabercel. This phenomena indicates the formation of "eutrophication waves" in this river reach, where the impounding (bakewater) effect of the river barrage of Tiszalök is felt. The species number of Copepods were much smaller, but in certain occasions some species or their larvae were found in higher density.