A glance at a large scale map of Labrador-Ungava brings to the forefront the fact that a myriad of lakes abound in the area. Schefferville, Quebec, the site of the McGill Sub-Arctic Research Laboratory and of the field work included in this thesis, is in an extremely advantageous location for the study of lakes, both large and small, for besides being in a formerly glaciated area, it is located on folded sedimentaries surrounded by the Canadian Shield. [...]

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