thumbnail

Enhanced reproduction in mallards fed a low level of methylmercury: An apparent case of hormesis

Environmental Toxicology and Chemistry

By:
, , ,
DOI: 10.1002/etc.64

Links

Abstract

Breeding pairs of mallards (Anas platyrhynchos) were fed a control diet or a diet containing 0.5 mg/g mercury (Hg) in the form of methylmercury chloride. There were no effects of Hg on adult weights and no overt signs of Hg poisoning in adults. The Hg-containing diet had no effect on fertility of eggs, but hatching success of eggs was significantly higher for females fed 0.5 ??g/g Hg (71.8%) than for controls (57.5%). Survival of ducklings through 6 d of age was the same (97.8%) for controls and mallards fed 0.5 ??g/g mercury. However, the mean number of ducklings produced per female was significantly higher for the pairs fed 0.5 ??g/g Hg (21.4) than for controls (16.8). Although mercury in the parents' diet had no effect on mean duckling weights at hatching, ducklings from parents fed 0.5 mg/g Hg weighed significantly more (mean = 87.2 g) at 6 d of age than did control ducklings (81.0 g). The mean concentration of Hg in eggs laid by parents fed 0.5 ??g/g mercury was 0.81 ??g/g on a wet-weight basis. At this time, one cannot rule out the possibility that low concentrations of Hg in eggs may be beneficial, and this possibility should be considered when setting regulatory thresholds for methylmercury. ?? 2009 SETAC.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Enhanced reproduction in mallards fed a low level of methylmercury: An apparent case of hormesis
Series title:
Environmental Toxicology and Chemistry
DOI:
10.1002/etc.64
Volume
29
Issue:
3
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Toxicology and Chemistry
First page:
650
Last page:
653
Number of Pages:
4