The first widescale assessment of methylmercury in adult amphibians in the U.S. to date shows that, in amphibians, this toxic compound is common, widespread and, at least for some, can reach very high levels.
, brought together scientists from around the country to test more than 3,200 amphibians representing 14 species from 26 populations.
Although the variation in concentrations between amphibians was large, with the highest measurement 33 times more than the lowest, it was much less than the variation reported for other animals like dragonflies, fishes and birds. The authors suggested the lower variation among amphibians was possibly because they collected samples mainly from wetlands whereas the studies on the other animal types collected samples from a larger diversity of habitats.
Study author and lead for the USGS Amphibian Research and Monitoring Initiative, Michael Adams, noted that this study also provides new methods and baseline data that can help scientists and managers assess the risk from mercury for species of management concern, including species listed as threatened and endangered under the Endangered Species Act.
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