An investigation of contaminants and benthic communities in the major rivers of the Hudson Bay Lowland, Ontario / R.C. McCrea ... [et al.]. : En36-503/131E-PDF

"A comprehensive water quality study was conducted June 4-11, 1981, near the mouths of the five major rivers of the Hudson Bay Lowland. A wide range of trace organic and trace metal contaminants were measured in water, fish, suspended and bottom sediments. Although levels of organochlorine pesticides were generally low in the water samples, a wide range of compounds were detected. Total PCB's (polychlorinated biphenyls), αz-BHC and p,p'-DDE were most often detected in fish and the concentrations of all of the compounds present were very low. Polychlorinated biphenyls were the only compounds detected in suspended sediment samples and all trace organic contaminants were below the detection limit in bottom sediment. The results of the survey conducted to determine benthic structure indicate that a large number of benthic species were present in each river, but that no one species predominated. The Chironomidae and Tubificidae families were the two major taxonomic groups in terms of numbers of individuals in each river"--Abstract, p. v.

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