Effects of heavy metals on the isopod Asellus aquaticus (L.) are studied by static toxicity tests. Results demonstrate that the species is sensitive to Cd + 2, Cr + 6, Cu + 2, Fe + 3, Hg + 2, Ni + 2, Pb + 2 and Zn + 2, but the toxicity of each metal is different. Differences are also found between adults and between adults and juveniles. The comparative analysis of all data on the toxicity has been performed on the concentrations of metal ions and not on metal compound concentrations.Criteria for establishing water quality in order to guarantee protection of the environment are discussed.
The effects of chronic exposure to 5 pg.1-I cadmium or copper on the crustacean Isopod Asellus aquaticus (L.) were studied by analyzing survival and body growth in the first stages of the life-cycle and by determining fecundity and survival of embryo-bearing females. Juveniles survival is differently affected by the two metals in that embryonic development is more sensitive to cadmium while juvenile development is more sensitive to copper. Juvenile body growth is stimulated by cadmium and depressed by copper. Embryo-bearing female survival and fecundity are significantly reduced by cadmium but are not affected by copper. The consequence of environmental contamination by a sublethal cadmium or copper concentration is discussed.
The effects of Copper on the life-cycle of two crustacean isopods, Asellus aquaticus (L.) and Proasellus coxalis Dollf., are studied. ST 50 indicates that females and males are differently sensitive in comparison with juveniles . The two species do not show differences in sensitivity in the range of 0.01-15 mg-1 -1 between adults and juveniles . The effect of 0 .005 mg • 1 -1 Copper sulphate was strongest on embryonic and larval stages .Ecological implications are discussed .
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