Physiological effects of chronic silver exposure in Daphnia magna

Daphnia magna were exposed to a total concentration of 5.0+/-0.04 microg Ag/l, added as AgNO(3) (dissolved concentration, as defined by 0.45 microm filtration = 2.0+/-0.01 microg Ag/l) in moderately hard synthetic water under static conditions (total organic carbon = 4.80+/-1.32 mg/l) with daily feeding and water renewal, for 21 days. There was no mortality in control daphnids and 20% mortality in silver-exposed animals. Silver exposure caused …