Qualitative and Quantitative study of Epipelic diatoms in Tigris River within Wasit province, Iraq

The present study conducted to epipelic diatoms in the Tigris River within Wasit province for one year from June 2015 May 2016, five sites have been chosen along river between Al-Aziziyah and Kut .The aim of was identify main distributed them data were collected by qualitative quantitative diatoms. A total number 161 species recorded belongs 36 genera, where central 14 belonged 7 genera (8.69%) pinnate 147 belonging 27 (91.30%). Seasonal spatial variations observed numbers benthic diatom during period, results lowest rate both (745.29× 104/cm3) site1 highest (1122.92 × 104 /cm3) site4.Some higher period; these Nitzschia, Navicula, Cymbella, Gomphonema, Amphora, Cyclotella, Melosira, Cocconies, Caloneis, Diatoma, Fragiaria, Surirella Synedra. revealed that Bacillariophyceae abundant, reflecting quality water mud determine extent pollution polluted type