![]() Environ Sci Technol 45(8):3781–3787īradford DF, Stanley K, McConnell LL, Tallent-Halsell NG, Nash MS, Simonich SM (2010) Spatial patterns of atmospherically deposited organic contaminants at high-elevation in the southern Sierra Nevada mountains, California. Environ Toxicol Chem 29:1–9īergeron CM, Hopkins WA, Todd BD, Hepner MJ, Unrine JM (2011) Interactive effects of maternal and dietary mercury exposure have latent and lethal consequences for amphibian larvae. Environ Toxicol Chem 26:118–125īergeron CM, Bodinof CM, Unrine JM, Hopkins WA (2010) Mercury accumulation along a contamination gradient and nondestructive indices of bioaccumulation in amphibians. Mercury concentrations were not related to distance from the adjacent San Joaquin Valley, a source of agricultural and industrial pollutants.īank MS, Crocker J, Connery B, Amirbahman A (2007) Mercury bioaccumulation in green frog ( Rana clamitans) and bullfrog ( Rana catesbeiana) tadpoles from Acadia National Park, Maine, USA. ![]() ![]() Concentrations in tadpoles were also lower than those observed in predaceous fish in the study region presumably because tadpoles in the present study were much younger (1–2 months) than fish in the other study (3–10 years), and tadpoles represent a lower trophic level than these fish. sierra were below concentrations known to be harmful in premetamorphic tadpoles of another species and below threshold concentrations for risk to predaceous wildlife. Median mercury concentrations were 14 ng/g wet weight (154 ng/g dry weight), which were generally low in comparison to tadpoles of 15 other species/location combinations from studies that represented both highly contaminated and minimally contaminated sites. Total mercury concentrations were measured in whole tadpoles of the Sierra chorus frog, Pseudacris sierra, two times at 27 sites from high elevations (2786–3375 m) in the southern Sierra Nevada. Amphibians in alpine wetlands of the Sierra Nevada mountains comprise key components of an aquatic–terrestrial food chain, and mercury contamination is a concern because concentrations in fish from this region exceed thresholds of risk to piscivorous wildlife.
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