Diatoms are an important group of aquatic ecosystems. To date, there have been many important algological studies in diff erent river basins in Turkey. However, the use of diatoms in biomonitoring (according to diatom indices, Watanabe's or Van Dam's systems) is relatively new in Turkey. In the present study, 41 samples of epilithic diatoms were collected from 5 stations along Felent creek between June 2006 and February 2007 and a total of 117 diatom taxa were identifi ed. Th e bio-indication

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... utoecology and abundance scores in the communities) of Felent creek was investigated and, as a result, the organic pollution indicators of Watanabe's classifi cation (81 species, 69.2%) constituted 3 groups. Th e Sládečék's index calculated for each sampling station varied from 1.36 to 2.08 (from oligo-to betamesosaprobic) at stations, and the river pollution index was calculated for each defi ned environmental variable as well as for species richness and index of saprobity over stations in summer and winter. Th e river water was alkaline and temperate with low salinity, and there was organic pollution in summer. Species richness was mostly higher in winter than in summer.