| Summary: | Global atmospheric concentrations of mercury (Hg) appear to be increasing and with it the potential for ecosystem exposure and ecological effects. rom 1990 to 1993 the authors examined U.S. arctic ecosystems over a broad spatial scale to develop baseline information on current concentrations of trace elements, heavy metals, (including Hg), persistent organic compounds, and radionuclides in various components of the terrestrial and freshwater biosphere. atrices reported here include vegetation (lichens and mosses) and lake sediments.
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