Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53807#.VNR0jSzQrzE Author(s) Fikrat M. Hassan 1* , Ali Obaid Shaawiat 2 Affiliation(s) 1 College of Science for Women, University of Baghdad, Baghdad, Iraq . 2 College of Education, University of Al-Qadisiyah, Al Diwaniyah, Iraq . ABSTRACT The study was conducted on epipleic diatoms in a lotic ecosystem. The Al-Shamiyah River was selected which is a distance from industrial activities. Four sites along the river were selected for sampling during the period from March 2013 to February 2014. A total of 173 species of epipelic diatoms were identified. The pennate diatoms predominated and represented about 92.49% of the total diatoms, while centric diatoms formed only 7.51%. The total number of diatoms ranged between 185.1 - 422.34 cell × 10 4 /cm 2 . Some of the pennate diatom species were Achnanthes affinis Grunow, Achnanthes mintussima Küetzin...
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