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¹ Dumlup ınar University, Fen Edebiy at Fakültesi, Biy oloji Bölümü, 43100 Kütahy a, Türkiy e. DOI : 10.4194/trjfas.2011.0105 Viewed : 4941 - Downloaded : 3762 In this study, the epilithic diatoms were investigated monthly to reveal the water quality of Upper Porsuk Creek. The Samples were collected from three stations between December 2004 and August 2005. In this study, a total of 57 diatom taxa were found along the creek. The water quality of Upper Porsuk Creek was determined according to these taxa. Different diatom indices (SLA- Sládecěk Index-, EPI-D-Eutrophication/Pollution Index, TDI-Trophic Diatom Index- and DESCYDescy Index) were used in this study. There were significant differences among three stations with regard to diatom index values. Also, the diatom indices were compared with each other and it was found that the correlation coefficients between the indices were quite high. Keywords : Benthic diatom, diatom indices, Porsuk Creek, water quality