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Floodplain systems along rivers are influenced by the hydrological regime of the river to an extent which depends on the degree of connectivity. As a result, the age of water within the system varies widely. Zooplankton development is restricted to areas and periods of higher water age and thus the role of zooplankton in planktonic carbon flow is strongly influenced by the hydrological dynamics. In 1997 and 1998 the plankton community was examined in the floodplain system along the River Danube, at two sections differing in connectivity to the main river. Zooplankton grazing rates and consumption were calculated, using filtration rates from the literature, based on qualitative and quantitative phyto- and zooplankton data. A succession in grazing dominance from rotifers to cladocerans and copepods was found with increasing water age. Maximal carbon flow and impact on algae by grazing rates of &gt;100% (mean 40.5%) were observed at intermediate connectivity, when zooplankton biomass peaked. Mean grazing impact at high connectivity amounted to 2.5%, and at low connectivity 8.8%, of the total phytoplankton biomass. The main grazers were Synchaeta spp., Polyarthra spp., and the small cladoceran, Bosmina longirostris. Herbivory dominated carbon transfer in the planktonic food webs during dynamic conditions. When conditions are stable, additional food pathways (bacterivory, predation) increase in significance and result in an increased biotic control.

The significance of zooplankton grazing in a floodplain system of the River Danube