THE ZOOPLANKTON OF THE RÁCKEVE-SOROKSÁR DANUBE: SPATIO-TEMPORAL CHANGES AND SIMILARITY PATTERNS

The Rackeve-Soroksar Danube has a great importance as it is the second largest side arm in the Hungarian section of the river Danube and many demands of exploitation are expected. The aim of this study is to analyse the spatial and temporal changes of the zooplankton (Copepoda, Cladocera) community in this river arm, moreover the similarity patterns of zooplankton communities in different Hungarian water bodies are presented in special consideration of the Rackeve-Soroksar Danube. Basically this study is based on data from literature, however our data are also used for compiling the database for the spatio-temporal changes of the Rackeve-Soroksar Danube. We put emphasis on the three typical sections of the side arm, as these are stressed due to hydromorphological aspects, but creating artificial borders are objectionable as well. The results show that both spatial and temporal changes are evident, what is more, the stagnant water character of the side arm should be underlined.