APPLICATION OF DIATOMIC INDICES (EPIPHYTIC DIATOMS) FOR ASSESSING WATER QUALITY FOR LOTIC ECOSYSTEMALI O. SHAAWIAT AND FIKRAT M. HASSANAbstract The aims of this study was to identify the quality of the Al-Shamiyah River by using the Physicochemical and biological factors (diatoms) from March 2013 to February 2014. Two aquatic plants (Ceratophyllum demersum and Phragmites australis) were selected to study epiphytic diatoms. Pollution, trophic and diversity indices were applied to assess water quality in the river. The pollution indices were Saprobic Index (S), Pollution Tolerance Index (P.T.I), Palmer Pollution Index (PPI), Index of Pollution Sensitivity (IPS) and Biological Water Quality Index (BWQI). The Trophic Indices were Percent Sensitive Species (SS %), Trophic diatom index (TDI), Diatomic Index (DI), Generic Diatom Index (GDI) and Trophic State Index (TSI). The Diversity Indices included Simpson Index (SI), Richness index (D), Shannon-Weaver index (Hâ), Evenness index (E) and McIntosh Diversity Index (Mc). The results showed that Al-Shamiyah River is a slight to medium polluted, oligotrophic -mesotrophic and high diversity of diatoms. The quality of water is ranging from moderate to good quality.
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