Effects of lead and cadmium on population density and specific growth rate of fresh water cladoceran Daphnia magna

In this study, the effects of four different concentrations of lead (0, 15, 48.6 and 150 µg/L) and four different concentrations of cadmium (0, 1.2, 3.7 and 6.2 µg/L) with low (2×105 cell/ml) and high (6×105 cell/ml) algal concentrations of Scenedesmus quadricauda on the density, specific growth rate )SGR( and doubling time (Dt) of fresh water cladoceran Daphnia magna were investigated. The experiment was carried out as a completly random design for 21 days with three replications. Results showed that the density and SGR were increased when concentrations of lead and cadmium decrease significantly (p