Methylmercury chloride and selenomethionine interactions on health and reproduction in mallards

  title={Methylmercury chloride and selenomethionine interactions on health and reproduction in mallards},
  author={Gary H. Heinz and David J. Hoffman},
  journal={Environmental Toxicology and Chemistry},
  • G. Heinz, D. Hoffman
  • Published 1 February 1998
  • Biology
  • Environmental Toxicology and Chemistry
Adult mallards (Anas platyrhynchos) were fed a control diet or diets containing 10 ppm mercury as methylmercury chloride, 10 ppm selenium as seleno‐DL‐methionine, or 10 ppm mercury plus 10 ppm selenium. One of 12 adult males fed 10 ppm mercury died, and eight others suffered paralysis of the legs by the time the study was terminated. However, when the diet contained 10 ppm selenium in addition to the 10 ppm mercury, none of 12 males became sick. In contrast to the protective effect of selenium… 

Reproduction in mallards exposed to dietary concentrations of methylmercury

It is concluded that mallard reproduction does not appear to be particularly sensitive to methylmercury, and the mercury concentrations in eggs may be more useful in extrapolating to possible harmful effects in nature than are the dietary levels the authors fed.

Interactions between methylmercury and selenomethionine injected into mallard eggs

Selenomethionine appeared to be more embryotoxic than equivalent doses of methylcury when injected into eggs, and both injected methylmercury and selenometHionine were more toxic to mallard embryos than when deposited naturally in the egg by the mother.

Selenium and mercury have a synergistic negative effect on fish reproduction.

Effects of mercury and selenium on glutathione metabolism and oxidative stress in mallard ducks

The ability of Se to restore the activities of G‐6‐PDH, GSH peroxidase, and glutathione status involved in antioxidative defense mechanisms may be crucial to biological protection from the toxic effects of methylmercury.

Chronic mercury chloride toxicity combined with selenium, by means of the hematological study in tilapia Oreochromis niloticus

Results indicated that the combination of mercury + sodium selenite did not cause changes to the hematological parameters, demonstrating the antagonistic effects to mercury, while the combinationof mercury + Sodium selenate caused synergism.

A Comparison of the Teratogenicity of Methylmercury and Selenomethionine Injected Into Bird Eggs

Overall, few interactions were apparent between methylmercury and selenomethionine with respect to the types of deformities observed, but the deformities spina bifida and craniorachischisis were observed only when Hg and Se were injected in combination.

Mercury and Selenium in American White Pelicans Breeding at Pyramid Lake, Nevada

Abstract American White Pelicans (Pelecanus erythrorhynchos) that breed on Anaho Island, Pyramid Lake, Nevada, are potentially exposed to a variety of contaminants. Therefore, the reproductive

Embryotoxic Thresholds of Mercury: Estimates from Individual Mallard Eggs

  • G. HeinzD. Hoffman
  • Environmental Science
    Archives of environmental contamination and toxicology
  • 2003
Although embryo mortality was seen in eggs estimated to contain as little as 0.74 μg/g mercury, there were considerable differences in the sensitivity of mallard embryos, especially from different parents, with some embryos surviving as much as 30 or more μg/G mercury in the egg.



Reproduction in mallards fed selenium

Mallards (Anas platyrhynchos) were fed diets containing 1, 5, 10, 25 or 100 ppm selenium as sodium selenite, a diet containing 10 ppm se lenium as seleno-DL-methionine or a control diet, and there did not appear to be a dose-response relationship at these lower levels.

Impaired reproduction of mallards fed an organic form of selenium

The dietary threshold of selenium as selenomethionine necessary to impair reproduction is between 4 and 8 ppm, which indicates that when eggs from a wild population contain > 1-ppm Selenium on a wet-weight basis, reproductive impairment may be possible and should be evaluated in that population.

Methylmercury: second-year feeding effects on mallard reproduction and duckling behavior

For 2 consecutive years mallard (Anas platyrhynchos) hens were fed a control diet or a diet that contained 0.5 or 3 ppm mercury as methylmercury, and ducklings from hens fed3 ppm mercury were less likely to survive to 1 week of age and hyper-responsive in avoidance behavior.

Embryotoxic and teratogenic effects of selenium in the diet of mallards.

Findings indicate that selenomethionine is considerably more teratogenic and generally more embryotoxic than sodium selenite, probably due to higher uptake of selenometrichions in hatchlings.

Overwinter survival of mallards fed selenium

Adult male mallards (Anas platyrhynchos) were fed diets supplemented with 0, 10, 20, 40, or 80 μg/g selenium in the form of selenomethionine during a 16-week exposure, but mortality was not clearly related to a threshold concentration of seenium in blood.

Subchronic hepatotoxicity of selenomethionine ingestion in mallard ducks.

Two-year-old male mallards received a control diet or diets containing 1, 2, 4, 8, 16, or 32 ppm Se as selenomethionine and showed signs of hepatotoxicity, with significant linear dose responses for hepatic oxidized glutathione (GSSG) concentrations and ratio of GSSG to reduced glutathion (GSH).

Dietary selenium protection of methylmercury intoxication of Japanese quail

Selenium, as sodium selenite, added at 5 ppm to purified diets of Japanese quail protected against methylmercury intoxication, and residues in liver, kidney, and brain are higher in male than female quail, which does not indicate that birds will show evidence of methylMERcury toxicosis.

A mutual protective effect of mercury and selenium in Japanese quail.

Dietary interactions between methylmercury (Ch3Hg) and sodium selenite (Na2SeO3) were studied in Japanese quail and analysis of tissues for total Hg showed that Hg was distributed in a pattern typical for alkyl mercurials.

Reproduction of mallards following overwinter exposure to selenium.

Influence of selenium on toxicity and metabolism of methylmercury in chicks and quail

The weight gain, liver Hg and muscle Hg data indicate that Semore modifies the toxicity and metabolism of Hg differently in chicks than in quail.