Effect of laying sequence on egg mercury in captive zebra finches: an interpretation considering individual variation

Environmental Toxicology and Chemistry
Langbo OuDaniel A Cristol

Abstract

Bird eggs are used widely as noninvasive bioindicators for environmental mercury availability. Previous studies, however, have found varying relationships between laying sequence and egg mercury concentrations. Some studies have reported that the mercury concentration was higher in first-laid eggs or declined across the laying sequence, whereas in other studies mercury concentration was not related to egg order. Approximately 300 eggs (61 clutches) were collected from captive zebra finches dosed throughout their reproductive lives with methylmercury (0.3 μg/g, 0.6 μg/g, 1.2 μg/g, or 2.4 μg/g wet wt in diet); the total mercury concentration (mean ± standard deviation [SD] dry wt basis) of their eggs was 7.03 ± 1.38 μg/g, 14.15 ± 2.52 μg/g, 26.85 ± 5.85 μg/g, and 49.76 ± 10.37 μg/g, respectively (equivalent to fresh wt egg mercury concentrations of 1.24 μg/g, 2.50 μg/g, 4.74 μg/g, and 8.79 μg/g). The authors observed a significant decrease in the mercury concentration of successive eggs when compared with the first egg and notable variation between clutches within treatments. The mercury level of individual females within and among treatments did not alter this relationship. Based on the results, sampling of a single egg in each ...Continue Reading

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Aug 27, 2013·Environmental Pollution·Claire W Varian-RamosDaniel A Cristol

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Citations

Dec 29, 2015·Environmental Pollution·Joshua T AckermanC Alex Hartman
Apr 21, 2016·The Science of the Total Environment·Joshua T AckermanColleen E Bryan
Sep 2, 2016·Environmental Toxicology and Chemistry·Phyllis C FuchsmanVictor S Magar
Jul 9, 2017·Environmental Pollution·Joshua T AckermanMark P Herzog
Dec 25, 2019·Environmental Science & Technology·Joshua T AckermanC Alex Hartman

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