Abstract
Eutrophication associated with high concentrations of phosphorus in Missisquoi Bay has raised concerns about its influence on submersed aquatic vegetation. Subaqueous soils could play an important role in nutrient cycling, algae blooms, the spread of invasive aquatic vegetation, and water quality. The objectives of this study were to (a) characterize some of the morphological, physical and chemical properties of subaqueous soils in Missisquoi Bay based on ground-penetrating radar and soil analysis; and (b) assess relationships among the subaqueous soil landscapes, radar facies, and submersed aquatic vegetation. Coarse Stratified Sediments and Lacustrine Silt radar facies associated with Delta/Nearshore and Lakebed/Bay Bottom subaqueous soil-landscape units covered 90 percent of the study area. The Lacustrine Silt radar facies occurred in relatively deep, low-energy, depositional areas and had the highest P concentrations. The majority of the submersed aquatic vegetation was associated with Delta/Nearshore and Fringing Peatland subaqueous soil landscapes under shallow water.
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