00000nam 2200000za 4500 9.863894 CaOODSP 20241203113644 cr ||||||||||| 181030s1984 oncbd ob f000 0 eng d 0662133277 (print) CaOODSP eng eng fre n-cn-on En36-503/131E-PDF En36-503/131E An investigation of contaminants and benthic communities in the major rivers of the Hudson Bay Lowland, Ontario [electronic resource] / R.C. McCrea ... [et al.]. Burlington, Ont. : Inland Waters Directorate, Ontario Region, Water Quality Branch, 1984. v, 47 p. : chart, maps. Technical bulletin ; no. 131 Issued also in French under title: Polluants et communautés benthiques des principales rivières des basses terres de la Baie d'Hudson (Ontario). Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 6-7). "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. Includes abstract in French. Water quality Water pollution Benthos Ontario, Northern Hudson Bay Region McCrea, R. C. Canada. Environment Canada. Canada. Inland Waters Directorate. Ontario Region. Water Quality Branch. Polluants et communautés benthiques des principales rivières des basses terres de la Baie d'Hudson (Ontario) (CaOODSP)9.863896 Technical bulletin (Canada. Inland Waters Directorate) no. 131. (CaOODSP)9.861123 PDF 1.48 MB https://publications.gc.ca/collections/collection_2018/eccc/en36-503/En36-503-131-eng.pdf