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Intake and assimilation of zinc, copper, and cadmium in the terrestrial isopod Porcellio scaber Latr. (Crustacea, Isopoda)



Intake and assimilation of zinc, copper, and cadmium in the terrestrial isopod Porcellio scaber Latr. (Crustacea, Isopoda)



Bulletin of Environmental Contamination and Toxicology 70(5): 1028-1035



A laboratory study was conducted to determine the Zn, Cu and Cd assimilation efficiency (AE) by comparing the intake and accumulation of metals in a pre-adult terrestrial isopod (Porcellio scaber). The effects of Zn, Cu and Cd contaminated food were quantified by measuring the feeding rates and described by sigmoidal dose-response curves, EC10 and EC50. Results showed that the consumption of Cd-dosed food was affected even at the lowest concentration and appears to be dose dependent, whereas the Cd concentrations in isopods were not. The AE of Cd was several times higher than that for Zn and Cu even at the highest concentration used. The EC10 values determined in the study for Zn corresponds to the Zn concentration in food that did not affect the reproduction or survival of P. scaber even on longer exposure. The EC10 for Cu was more than 3 times higher than the Cu concentration in food that caused reduction in growth or survival of isopods on longer exposure. It appears that the toxicity data for Zn and Cd obtained in different tests were similar. In contrast, the toxicity data for Cu may depend more on the endpoint selected. Laboratory toxicity data shoed that EC10 and EC50 for Zn were evidently higher than those for Cu and Cd, but the potential toxicity of Zn in a polluted environment should not be overlooked since concentrations of Zn can be more than 100 times higher than those of Cd and Cu. The results also indicate that a reduced feeding rate is one mechanism of metal intake regulation. However, the reduction of feeding seemed independent of metal storage capacities. Feeding rate is reduced in a dose-dependent manner after the consumption of Zn, Cd and Cu contaminated food.

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Accession: 003819325

Download citation: RISBibTeXText

PMID: 12719832

DOI: 10.1007/s00128-003-0086-1


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