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- W2125684918 abstract "The accumulation of two mercury compounds—HgCl2 and CH3HgCl—by Hexagenia rigida (burrowing mayfly nymphs) from contaminated sediments was investigated experimentally. Three exposure periods were selected: 7, 14 and 28 days. Results reveal a high capacity of this species for Hg accumulation and considerable differences between the two chemical forms of the metal. Thus, the amount of total mercury accumulated after 28 days' exposure would be 60 times greater for the organic form if the two compounds were initially added to the sediment in the same concentrations. No significant growth inhibition appears for the different experimental conditions studied. Data treatment at the organism level showed a positive linear correlation between the fresh weight and Hg content in the nymphs; this was especially marked when the exposure time was relatively long and Hg was in the form of CH3HgCl. The study of mercury distribution in the organs of Hexagenia rigida (gills and gut) and the examination of results obtained in similar experimental conditions after contamination of the nymphs via the water column showed the importance of the trophic route, via ingested sediment, for the bioaccumulation of the metal initially introduced into the sediment." @default.
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- W2125684918 date "1991-01-01" @default.
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- W2125684918 title "Hexagenia rigida (ephemeroptera) as a biological model in aquatic ecotoxicology: Experimental studies on mercury transfers from sediment" @default.
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- W2125684918 doi "https://doi.org/10.1016/0269-7491(91)90163-q" @default.
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