Munagamage, T.Rathnayake, I.V.N.Pathiratne, A.Megharaj, M.2017-10-272017-10-272016Munagamage, T., Rathnayake, I.V.N., Pathiratne, A., and Megharaj, M., (2016). Sensitivity of Four Cyanobacterial Isolates from Tropical Freshwaters to Environmentally Realistic Concentrations of Cr6+, Springer US. Vol 96 (6). 816-821http://repository.kln.ac.lk/handle/123456789/17911Sensitivity of four tropical cyanobacteria viz. Coelosphaerium sp., Synechococcus sp., Oscillatoria sp. and Chroococcus sp. to environmentally relevant concentrations of Cr6+, Cd2+ and Zn2+was assessed based on fluorescence change as a proxy for growth reduction. At 24 h exposure, the growth reduction inthe cyanobacteria followed the order: Zn2+ < Cr6+ ≤ Cd2+. Of the four cyanobacteria, Synechococcus was the most sensitive for Cr6+, where as Chroococcus was the most sensitive for Cd2+and Zn2+. Sensitivity was gradually decreased by 96 h implying the acquisition of tolerance by cyanobacteria to heavy metal ions with prolonged exposure.enCyanobacteriaChromiumCadmiumZincFluorescenceConcentration responseArticle