Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition

Abstract Acute toxicity of inorganic mercury [Hg(II)] and methylmercury (MeHg) to Daphnia magna was characterized using a 48-h static, non-renewal acute toxicity test, in which we compared the toxicity of Hg(II) and MeHg in the absence (water-only) and presence of diet [green alga (Raphidocelis subc...

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Autores principales:	Christopher A. Hylton, Martin Tsz-Ki Tsui
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2f09188d3bf848c7b0ae4347e963e009
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spelling	oai:doaj.org-article:2f09188d3bf848c7b0ae4347e963e0092021-11-28T12:16:00ZAlteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition10.1038/s41598-021-02300-42045-2322https://doaj.org/article/2f09188d3bf848c7b0ae4347e963e0092021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02300-4https://doaj.org/toc/2045-2322Abstract Acute toxicity of inorganic mercury [Hg(II)] and methylmercury (MeHg) to Daphnia magna was characterized using a 48-h static, non-renewal acute toxicity test, in which we compared the toxicity of Hg(II) and MeHg in the absence (water-only) and presence of diet [green alga (Raphidocelis subcapitata), yeast, Cerophyll, and trout chow (YCT), or both]. Overall, Hg(II) is more toxic to D. magna than MeHg, with 48-h median lethal concentrations (LC50s) being 4.3 µg/L (95% confidence interval: 4.1–4.5 µg/L) for Hg(II) and 14.3 µg/L (13.2–15.3 µg/L) for MeHg. For Hg(II), the addition of any diet would significantly increase its 48-h LC50, but the 48-h LC50 for MeHg decreased significantly to 7.1 µg/L (6.4–7.8 µg/L) with the algal addition. We also show that the addition of diets significantly influenced the levels and speciation (dissolved vs. particulate) of both Hg forms in the test solution. The bioaccumulation of Hg(II) and MeHg was impacted by the dietary addition, and it appears that the body residue level triggering mortality varied widely among treatments. The results suggest that standard short-term toxicity tests (water-only) should be supplemented with extra tests with dietary addition to provide a more environmentally relevant estimation of short-term toxicity of chemical compounds.Christopher A. HyltonMartin Tsz-Ki TsuiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Christopher A. Hylton Martin Tsz-Ki Tsui Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition
description	Abstract Acute toxicity of inorganic mercury [Hg(II)] and methylmercury (MeHg) to Daphnia magna was characterized using a 48-h static, non-renewal acute toxicity test, in which we compared the toxicity of Hg(II) and MeHg in the absence (water-only) and presence of diet [green alga (Raphidocelis subcapitata), yeast, Cerophyll, and trout chow (YCT), or both]. Overall, Hg(II) is more toxic to D. magna than MeHg, with 48-h median lethal concentrations (LC50s) being 4.3 µg/L (95% confidence interval: 4.1–4.5 µg/L) for Hg(II) and 14.3 µg/L (13.2–15.3 µg/L) for MeHg. For Hg(II), the addition of any diet would significantly increase its 48-h LC50, but the 48-h LC50 for MeHg decreased significantly to 7.1 µg/L (6.4–7.8 µg/L) with the algal addition. We also show that the addition of diets significantly influenced the levels and speciation (dissolved vs. particulate) of both Hg forms in the test solution. The bioaccumulation of Hg(II) and MeHg was impacted by the dietary addition, and it appears that the body residue level triggering mortality varied widely among treatments. The results suggest that standard short-term toxicity tests (water-only) should be supplemented with extra tests with dietary addition to provide a more environmentally relevant estimation of short-term toxicity of chemical compounds.
format	article
author	Christopher A. Hylton Martin Tsz-Ki Tsui
author_facet	Christopher A. Hylton Martin Tsz-Ki Tsui
author_sort	Christopher A. Hylton
title	Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition
title_short	Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition
title_full	Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition
title_fullStr	Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition
title_full_unstemmed	Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition
title_sort	alteration of acute toxicity of inorganic and methyl mercury to daphnia magna by dietary addition
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2f09188d3bf848c7b0ae4347e963e009
work_keys_str_mv	AT christopherahylton alterationofacutetoxicityofinorganicandmethylmercurytodaphniamagnabydietaryaddition AT martintszkitsui alterationofacutetoxicityofinorganicandmethylmercurytodaphniamagnabydietaryaddition
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Alteration of acute toxicity of inorganic and methyl mercury to Daphnia magna by dietary addition

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