| mercury exposure and effects on cavity-nesting birds from the carson river, nevada. | mercury (hg) concentrations were 15-40 times higher in the eggs and livers of tree swallows (tachycineta bicolor) and house wrens (troglodytes aedon) that nested along the carson river at and below dayton, nevada than in the same species above the mining-impacted areas. hg contamination was mainly the result of processing mills in the 1800s that used hg to separate gold and silver from ore. the exposure pattern of tree swallows and house wrens along the carson river was consistent with their tro ... | 2007 | 17083002 |