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This study shows that metal-contaminated sediments cause adverse biological effects at all levels of biological organization, from cellular to ecosystem-level responses, even where the corresponding surface water meets water-quality-based criteria. We studied the effects of contamination from the abandoned Alder Mine, Alder Mill, and Red Shirt Mill located near the town of Twisp on the eastern slopes of the north Cascade Mountains in Okanogan County, Washington (U.S.A.) on fish and wildlife habitat in the Methow River. Ore deposits in the area were mined for gold, silver, copper and zinc until the early 1950s. An up-gradient and down-gradient approach was used to compare impacted sites to control sites. Although...
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