Document Type : Primary Research paper
A seasonal study of Epipelion algal community (epipelic algae) was conducted in Euphrates River (Al-Hussainya) for the period from October 2012 to September 2013. A total of 203 taxa of Epiplion algae were identified which belonging to five classes of algae. The algal community dominated by Bacillariophyceae was (79.3%) followed by Cyanophyceae (10.84%) and Chlorophyceae (6.9%). Euglenophyceae and Dinophyceae were constituted 1.48% of the total number. The total number of Epipelic algal cells ranged from 9924.5 x 104 cell/cm2 in the autumn to 10.02 x 104 cell/cm2 in the summer. Some genera of algae were dominated during this study in the term of number of species, these genera include Nitzsche, Navicula, Cymbella, Fragilaria and Oscillatoria. These algae might be indicated that the river under the impact of organic pollution.