Abstract

• Monthly variations of green algae (Chlorophyceae) and water quality of Sedawgyi Dam, Madaya Township, Mandalay Region were studied from March to December 2018. Algal specimens and water samples were collected from three stations of Sedawgyi Dam. Physicochemical parameters of water samples such as pH, temperature, alkalinity, total hardness, nitrite nitrogen, phosphate, biological oxygen demand and dissolved oxygen were also analyzed. In the present study, a total of 14 genera and 37 species of green algae (Chlorophyceae) were recorded. The green algae specimens of Sedawgyi Dam consisted of Chlorococcum (1 species), Tetradon (1 species), Selenastrum (1 species), Kirchneriella (1 species), Coelatrum (2 species), Scenedesmus (5 species), Pediastram (10 species), Closterium (4 species), Cosmarium (3 species), Spondylosium (2 species), Arthrodesmus (1 species), Staurastrum (4 species), Stauradesmus (1 species) and Eurastrum (1 species). The algal specimens were found to be more abundant in April and May and less abundant in July to September. The physio-chemical data analysed in Sedawgyi Dam indicates that the lake is at present free from pollution.