Impacts and pathways of mine contaminants to bull trout (Salvelinus confluentus) in an Idaho watershed

Archives of Environmental Contamination and Toxicology
Tim KiserBrian Kennedy

Abstract

Metals contamination from mining activities is a persistent problem affecting aquatic ecosystems throughout mining districts in the western USA. The Gold Creek drainage in northern Idaho has a history of mining within its headwaters and contains elevated sediment concentrations of As, Cd, Cu, Pb, and Zn. To determine system-wide impacts of increased metals, we measured concentrations of metals in water, sediment, and benthic macroinvertebrate tissues and related them to whole-body fish tissues and histopathological alterations in native salmonids. Water concentrations were higher than those in reference areas, but were below water quality criteria for protection of aquatic biota for most of the study area. Sediment and benthic macroinvertebrate tissue concentrations for all metals were significantly higher at all sites compared with the reference site. Fish tissues were significantly higher for all metals below mine sites compared with the reference site, but only Cd and Pb were higher in fish tissues in the furthest downstream reach in the Gold Creek Delta. Metals concentrations in benthic macroinvertebrate tissues and fish tissues were strongly correlated, suggesting a transfer of metals through a dietary pathway. The concent...Continue Reading

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Citations

Sep 12, 2013·Archives of Environmental Contamination and Toxicology·Hannah J BroadleyCelia Y Chen
May 2, 2014·Ecotoxicology and Environmental Safety·Nik VeldhoenCaren C Helbing

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