Quagga mussels (Dreissena bugensis) as biomonitors of metal contamination: A case study in the upper St. Lawrence River

►Quaggas mussels are useful as biomonitors for trace metals ►Bioaccumulation shows enrichment in the upper St. Lawrence River ►Metals in tissues varied among sites and years ►No strong declines in metal concentrations occurred from 1999 to 2007 ►Dreissenid filtration in Lake Ontario and reduce loadings may reduce loads to the river