The vegetation of the Canadian Prairie Provinces III. Aquatic and semi-aquatic vegetation, Part 3 Aquatic plant communities
The aquatic vegetation of the Canadian Prairie Provinces is described, and a classification proposed. The macrophytic communities can be placed in the two existing classes: Lemnetea and Potametea. One order, four alliances, ten associations and five sociations are newly described. Phytoplankton analyses show that usually accepted criteria for characterizing water types are not reliable, as trophic levels appear to be determined primarily by nitrogen content. Algae and macrophytes both appear to react to eutrophication of the water in the same manner, but greatly increased density of macrophyte populations causes decreased density of algal populations.