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Trophic Transition in a Lake on the Virginia Coastal Plain

Department of Biology, College of William and Mary, Williamsburg, VA 23187

View larger version (19K): [in a new window]   Fig. 1. Outline of the Lake Matoaka watershed in southeastern Virginia, showing the location of five perennial streams (solid lines) and associated subwatersheds (dotted lines). Subwatershed coring stations in the five stream deltas in the lake are shown.

View larger version (108K): [in a new window]   Fig. 2. Median separation plots for HCl-extractable Fe (open circles = 0.03–0.14%, filled circles = 0.15–0.40%) and total P (open circles = 0.02–0.12%, filled circles = 0.13–0.30%) in surface sediments of Lake Matoaka.

View larger version (96K): [in a new window]   Fig. 3. Median separation plots for weight percent organic matter (open circles = 5–13%, filled circles = 14–40%) and biogenic silica (open circles = 0.01–0.10%, filled circles = 0.11–0.25%) in surface sediments of Lake Matoaka.

View larger version (111K): [in a new window]   Fig. 4. Molar C to N ratios in surface sediments of Lake Matoaka. Open circles = C to N ratio of <20, filled circles = C to N ratio of 20. One-meter depth contours are shown; depths of >3 m are shaded darker.

View larger version (24K): [in a new window]   Fig. 5. Depth profiles of biogenic silica and total P from delta cores downstream of more-developed Subwatersheds 1 and 2 (solid symbols) and less-developed Subwatersheds 3, 4, and 5 (open symbols).