Effect of Body Size on Toxicity of Zinc in Neonates of Four Differently Sized Daphnia Species |
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| Authors: | Sarka Vesela Jacobus Vijverberg |
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| Affiliation: | (1) Research and Development Centre Hostivice, Jiraskova 165, 253 01 Hostivice, Czech Republic;(2) Department of Toxicology, Faculty of Military Health Sciences, University of Defense, Trebesska 1575, Hradec Kralove, Czech Republic;(3) Department of Food Web Studies, Netherlands Institute of Ecology (NIOO-KNAW), Centre for Limnology, Rijksstraatweg 6, NL-3631, AC , Nieuwersluis, the Netherlands;(4) Present address: Central Military Hospital Prague, U Vojenské nemocnice 1200, 169 02 Praha 6, Czech Republic |
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| Abstract: | The sensitivity of neonates of four Daphnia species to zinc was tested in relation to their mean body size. These mean sizes of these four Daphnia spp were: D. magna, 0.813 ± 0.055 mm, D.␣pulicaria, 0.745 ± 0.063 mm, D. pulex, 0.645 ± 0.044 mm and D. galeata, 0.611 ± 0.058 mm. A positive relationship between EC50 (24, 48) values and neonates size was found. The smaller the size of the daphnid the higher was the sensitivity to heavy metal toxicity. For all tested species did the EC50 values decrease with time; the decrease was most marked for D. magna and the least for D. galeata. The EC50 values of D. magna were higher than would be expected on basis of its body size. |
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| Keywords: | Body size Crustacean Metallothioneins Metals Toxicity tests |
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