A recent study from the University of Nevada, Reno reveals persistent mercury contamination in the Carson River, resulting from 19th-century gold mining. High levels of methylmercury—up to 60 times federal safety limits—were found in resident wood ducks, particularly affecting ducklings, which showed mercury levels three times higher than adults. Flood events mobilize mercury from riverbanks, reintroducing it into the food web, primarily through aquatic sources like invertebrates. Despite alarming findings, Nevada lacks consumption advisories for waterfowl, raising significant health concerns. The study emphasizes that reducing river flow could limit mercury exposure, though it would impact agriculture and waterfowl reproduction. The research calls for advisories to inform public choices about waterfowl consumption.
Impact of Historic Gold Mining on the Carson River Watershed and Waterfowl Today
By Terrain News
