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Benthic algae are the most productive organisms in aquatic ecosystemms and they’re the main source of food for benthic organisms and some fish’s larvae. The aim of this study was the Identification and study of abundance of Epipleonalgaecolonies in Shadegan international wetland. Samples collected in the one year period, from April 2010 to March 2011 according to the U.S. EPA method. 18 genius of Epipleon were identified in this study. The most frequent taxa respectively were Bacillariophyceae and Cyanophyceae, because of their high tolerance to the environmental conditions. The most important genius of Bacillariophyceae were Navicula,Nitzchia and Synedra and dominant genius of Cyanophyceae was Oscillatoria that indicating their presence in the waters with medium quality. The total mean number of Epipleon was 9555/m2 in the study area. The highest frequency of Bacillariophyceae and Cyanophycea was observed in autumnandDoragh region. According to One wayANOVAanalytical method, there is no significant difference between the frequency of Epipleon genius in the different regions (P> 0.05) however a significant difference was shown in the months (P<0.05). Cluster analysis showed more than75 percent similarity for 15 genius of algea and approximately 60% similarity between Doragh and Malh. Due to high salinity, Doragh and Malh, were in one group and Rgbh and Eetaysh made another group because of their similarity for little salinity.

Keywords: Epipleon Algea, Shadegan Wetland, Benthic Algae

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