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30 of rotifers was low compared with that of phytoplankton (<30% of total carbon ingestion) except when phytoplankton biomass decreased below the incipient limiting level (ILL) of the main metazooplantonic species. In such conditions, protozoa (mainly ciliates) constituted  50% of total rotifer diet. These results give evidence that microbial organisms play a significant role within the planktonic food web of a eutrophic lowland river, ciliates providing an alternative food for 35 metazooplankton when phytoplankton becomes scarce.