[Map of Niagara River and Grand River] - part 2. 1815
Abstract
Scale [ca. 1:180,000] Oriented with north to the bottom. Watermark: 'J Bates 1812' Relief shown by hacures.'Map of Grand River &c. Map of River Niagara &c. &c.' - title used in 'Mapping Upper Canada 1780-1867' / Joan Winearls. Digital reproduction of map (33 x 80 cm.) in the Brock University Map, Data & GIS Library collection. Georeferenced and modified from Brock call # G 3462 N53 1815 M37 by Map, Data and GIS Library, Brock University.Collections
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Sediment genotoxicity and its relationship to the frequency of chironomid labial plate deformitiesSediment samples were taken from seven locations in the WeIland River in December 1986 and April 1987. The DMSO extracts of these sediment samples showed a significant (p<O.Ol) · genotoxic effect for one location situated dir ectly below a polyvinyl chloride plant's discharge pipe (station D-l) . It was concluded that genotoxic contaminants were associated with the sediments from this l ocation. Analysis of sediment samples from the nearby station D-2 resulted in a significant (p <0 . 05) positive genotoxic response in December but not in April. Chironomids (midge larvae) taken from each of seven study locations were analyzed for the frequency of chironomid labial plate deformities (over 1000 individual specimens were observed) . The samples from station D-l showed the highest frequency of chironomid labial plate deformities (10 . 9% ± 3.2%), while samples from the upstream control (station A) displayed t,he lowest frequency of deformities (3.8% ± 1.3%). All samples were coded to avoid unconscious biases . The results of the genotoxicity study indicated that station D-l in the WeIland River was contaminated with genotoxic materials. The genotoxic materials may have induced the observed increased frequency in chironomid labial plate deformities . Samples from stations C and D-l, located in a downstream portion of the river bounded by an industrialized area were slightly toxic according to -the alkaline phosphatase inhib_ii~ion component of the 50S chromotest analyses. The toxicity of these samples was only evident once they had been activated by the 59 (liver extract) mixture.
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Margherita Howe fonds, 1972, 1977-1995, n.d.30 cm textual records 1 photograph: b & w 3 diaries
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Niagara River (Ontario) Remedial Action Plan fonds, 1984-1997, n.d.Fonds contains material relating to the work and activities of the Niagara River (Ontario) Remedial Action Plan Committees. The bulk of the material is meeting minutes and reports. Other materials include correspondence, newsletters, news clippings, promotional material, and audio and video cassette tapes.
