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This material is flushed into stream channels from riparian and floodplain habitats or resuspended from material that had accumulated on the stream bottom. Our study showed significant correlation between rotifer abundance and amount of inflow and a tendency in the ��13C signature of 10�C50-?m fraction of seston towards a level typical of terrestrial plant material with elevated inflow. Suggestion of a dependence http://www.selleck.cn/products/PLX-4720.html of zooplankton community on POM was indicated by Hou et al. [7], and they mentioned also direct POM consumption by planktonic filtratores. Such relationships may be obscured by interactions from competitors and predators. In general, the strongest were correlations with preceding flushing summed over a short period of about 1.5?wk. Quick recovery of rotifer communities after high water inflow (1?wk after flood event) was observed in submountane reservoirs [19, 21, 22]. This result may be due to effects of seasonal occurrences of conditions promoting development of r-strategists. Such species can http://www.selleckchem.com/products/avelestat-azd9668.html quickly react on changes of habitat conditions in an unstable environment, because their body size is small, reproduction is fast, and lifespan is short [23]. Their need for high concentrations of food may be met partly by an elevated level of fine POM that is of the proper size to be available as food. The rotifer species dominant in the Dobczyce Reservoir are filter feeders and according to published data consume particles http://www.selleckchem.com/products/a-1331852.html [8, 7]. We cannot discount the possibility that rotifer density may be influenced by a release from predators and/or competitors accordingly to the value of preceding flushing of reservoir. Such relations between dynamics of whole food chains including rotifers and reservoir hydrology need further study. Proposed explanation of obtained results remains in accordance with other studies aimed to explain what happens with terrestrial organic matter in aquatic ecosystems [6]. It is worth of note that after higher river inflow the ��13C signature in rotifer-dominated fraction of zooplankton in the Dobczyce Reservoir tended towards the value characteristic of terrestrial C3 plants in northern latitudes [2], which points to the terrestrial origin of incorporated carbon [3, 10].