| Summary: | . The overall objectives of my study are 1) to establish a high-resolution temporal reconstruction of environmental and climatic impacts on aquatic conditions at three sites, each at a different latitude and in a different ecoclimatic zone; 2) to develop a spatial-temporal image of postglacial environmental changes in the Québec-Labrador region through the use of radiocarbon dating; and 3) to compare the synchronicity of several indicators (diatoms, chironomids, and pollen) in order to assess differences between the responses of aquatic and terrestrial organisms to climate change. . The first lake, K2 (informal name), is located at 58° 44' N, 65° 56' W, 6 km northeast of the town of Kangiqsualujjuaq and about 11 km southwest of Ungava Bay. The second lake, Oksana (informal name), is located at 54° 49 N, 66° 50' W, near Schefferville. The third lake, Lac au Sable at 51° 24' N, 66° 13' W, was sampled by researchers George A. King and Herb E. Wright (Limnological Research Center, University of Minnesota) and is located about 130 km north of Sept-Îles. The sediment cores from each lake were subsampled at 1 cm intervals, each representing a period of approximately 10 - 50 years. . So far, diatoms and chironomids have been underexploited as biological indicators of change in northern Québec-Labrador, and they will be increasingly used in future research. .
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