Acute toxicity of inorganic selenium to Daphnia magna (Straus) and the effect of sub-acute exposure upon growth and reproduction |
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Authors: | P. A. Johnston |
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Affiliation: | School of Biological Sciences, Queen Mary College, London, U.K. |
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Abstract: | The acute toxicities of sodium selenite (Na2SeO3) and sodium selenate (Na2SeO4) to Daphnia magna were determined in defined culture at 22°C. For adults, the 48-h LC50 values were 0.68 ppm selenium as selenite and 0.75 ppm selenium as selenate. Juveniles were more sensitive, with a 48-h LC50 of 0.55 ppm selenium as selenate. Eggs and embryos were found to be much less sensitive, with a 72-h LC50 of 1.4 ppm selenium as selenate. Sub-acute exposure of D. magna to sodium selenate caused suppression of growth over instars 1–5 and reduced egg production in instar 9 when adults were exposed to test solutions from instar 6 onwards. These sublethal effects were found at concentrations in the range proposed as suitable for the use of selenium in the amelioration of mercury contamination. |
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Keywords: | Selenium Toxicity, acute and sub-acute D. magna |
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