A Study Of Seasonal Variation Of Phytoplankton In Relation To Variation In Water Quality In Lege Dadi Reservoir

The quality of I'later in Lege Dadi reservoir wasrnassessed in terms of its physical, ohemioal and biologicalrnoharacterstics for a period of one year from June 1982 -rnMay 1983.rnPhysical and chemical characterstios of the Io[aterrnassessed inolude temperature, pH, odour,taste,oolour,rnsuspended solids,turbidity,hardness,alkalinity,carbonrndioxide, oxygen, nitrate, nitrite, ammonia, phosphate,rnsilicate, fluoride, iron, manganese, copper andrnconducti vi ty. The data obtained were compared withrnWHO (ref. Cox, 1964) standard values for souroe Water.rnIt is found that almost all measurements fall withinrnthe maximum allowable values given by WHO (ref. Cox,rn1964) and prove that Lege Dadi reservoir is a goodrnsouroe of 11ater for the publio.rnBiologioal method of water quality assessmentrnwas performed using algae as indicator. Biomass estimate,rnperiodioity and speoies oomposition of phytoplankton wererninvestigated. Periodicity of various taxonomic divisionsrnsuoh as Chlorophyceae, Cyanophyceae, Baoillariophyceaernand Dinophyceae Was found to be related with some

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