Hormesis Associated with a Low Dose of Methylmercury Injected into Mallard Eggs |
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Authors: | Email author" target="_blank">Gary?H?HeinzEmail author David?J?Hoffman Jon?D?Klimstra Katherine?R?Stebbins Shannon?L?Kondrad Carol?A?Erwin |
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Institution: | (1) United States Geological Survey, Patuxent Wildlife Research Center, BARC-East, Building 308, 10300 Baltimore Avenue, Beltsville, MD 20705, USA |
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Abstract: | We injected mallard (Anas platyrhynchos) eggs with methylmercury chloride at doses of 0, 0.05, 0.1, 0.2, 0.4, 0.8, 1.6, 3.2, and 6.4 μg mercury/g egg contents on
a wet-weight basis. A case of hormesis seemed to occur because hatching success of eggs injected with 0.05 μg/g mercury (the
lowest dose) was significantly greater (93.3%) than that of controls (72.6%), whereas hatching success decreased at progressively
greater doses of mercury. Our finding of hormesis when a low dose of methylmercury was injected into eggs agrees with a similar
observation in a study in which a group of female mallards was fed a low dietary concentration of methylmercury and hatching
of their eggs was significantly better than that of controls. If methylmercury has a hormetic effect at low concentrations
in avian eggs, these low concentrations may be important in a regulatory sense in that they may represent a no-observed adverse
effect level (NOAEL). |
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