A Study of Seasonal Variation of Phytoplankton in Relation to Variation in Water Quality In Lege Dadi Reservoir

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Addis Ababa University


The quality of I'later in Lege Dadi reservoir was assessed in terms of its physical, ohemioal and biological oharacterstics for a period of one year from June 1982 - May 1983. Physical and chemical characterstios of the Io[ater assessed inolude temperature, pH, odour,taste,oolour, suspended solids,turbidity,hardness,alkalinity,carbon dioxide, oxygen, nitrate, nitrite, ammonia, phosphate, silicate, fluoride, iron, manganese, copper and conducti vi ty. The data obtained were compared with WHO (ref. Cox, 1964) standard values for souroe Water. It is found that almost all measurements fall within the maximum allowable values given by WHO (ref. Cox, 1964) and prove that Lege Dadi reservoir is a good souroe of 11ater for the publio. Biologioal method of water quality assessment was performed using algae as indicator. Biomass estimate, periodioity and speoies oomposition of phytoplankton were investigated. Periodicity of various taxonomic divisions suoh as Chlorophyceae, Cyanophyceae, Baoillariophyceae and Dinophyceae Was found to be related with some