ASSESSMENT OF THE WATER QUALITY OF UM EL-NAAJ MARSHES BY DIATOMSNeran A. AL Naqeeb, Jinan S. Al Hassany and Fouad K. MashiAbstract This study is to assess the water quality in Um El-Naaj Marshes which is used the Diatoms community as a bioindicator for assessing the water quality. Diatom indices {Trophic diatom index (TDI), Diatom index (DI), Generic diatom index (GDI)} about the status of the freshwater ecosystem. In this study, the epiphytic diatoms on host aquatic plants Phragmites australis were collected from six sites at Um El-Naaj Marshes from November 2018 to April 2019. A total of 155 diatom taxa were identified. The results have shown that families such as Naviculaceae 27.2%, 21.5%, 25.5%, 26.4%, 18.4%, 18.4% were the most dominant followed by Fragilariaceae 18.2, 10.7, 13.9, 16.9, 13.8, 13.8% respectively. The presence of these families indicates that the trophic status of the ranges from mesotrophic to eutrophic, and the Um El-Naaj Marshes is ranged from abundant to moderate, while the DI was moderately polluted or significantly eutrophicated. |