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Gemenc floodplain lies between river kilometres km 1503 and 1469 of the Danube River; it is a part of the Danube-Dráva National Park in Hungary. The floodplain is one of the largest in Europe with an 18,000 hectares (Natura 2000) area, and various characteristic side arms and backwaters which lie completely in the floodplain. The area needs hydrological revitalization because of the sinking of the river bed caused by the regulation of the main arm at the end of the 19th century. For this revitalization an exhaustive knowledge of the hydrobiological relationships among the different water bodies is required. The aims of this study were to explore connections among the hydrological events, physico-chemical parameters of the water bodies and the diversity of the planktonic rotifer assemblages. From 2002 to 2004, 56 planktonic and 15 tychoplanktonic rotifer taxa were found in the area. The diversity of rotifer assemblages was generally higher in the parapotamal water bodies than in the main arm and in the plesio/paleo-potamal water bodies, which could be explained by the intermediate disturbance hypothesis. The diversity, dominance, and evenness of the assemblages were correlated with water flow and water temperature. The most important factors influencing the diversity patterns were the occurrence of flow (retention time) as a disturbance, connectivity with the main arm, and habitat diversity of the given water body. Most of these factors are determined by the water level fluctuation of the main arm.

Diversity of planktonic rotifer assemblages in the water bodies of the Gemenc floodplain (Duna-Dráva National Park, Hungary)