2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:15 AM - 11:30 AM | NUTRIENT RATIO EFFECTS ON PHYTOPLANKTON ASSEMBLAGES IN A POTABLE SOURCE-WATER RESERVOIR OF THE SOUTHEASTERN U.S. | 254 B
NUTRIENT RATIO EFFECTS ON PHYTOPLANKTON ASSEMBLAGES IN A POTABLE SOURCE-WATER RESERVOIR OF THE SOUTHEASTERN U.S.
Many potable waters in the U.S. are sustaining cultural eutrophication, concomitant with major shifts in nutrient ratios. Falls Lake is a representative, eutrophic potable source-water reservoir characterized by a degraded upper region prone to algal blooms relative to the lower region. We conducted in situ summer experiments to assess phytoplankton assemblage response to inorganic N:P ratios (molar, 16:1 and 50:1) at ambient P with N added as ammonium or nitrate, and at N:P 16:1 with both inorganic N and P enriched. In the upper region, chlorophyll a significantly increased under all three conditions (16:1 using nitrate; 50:1 using nitrate or ammonium; and 16:1 with both N and P enriched, using nitrate or ammonium). In the lower region, chlorophyll a significantly increased under the 16:1 ratio with both N and P enriched, using nitrate or ammonium. The natural assemblage in the upper region was dominated by toxigenic cyanobacteria regardless of the N-enriched form, whereas in the lower region nitrate additions favored chlorophytes and ammonium additions favored toxigenic cyanobacteria. The data suggest that co-managed, balanced reductions of N and P are needed to minimize harmful algae in this important potable-source water.
- Eutrophication
- Nitrogen
- Phosphorous
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Presenters/Authors
Nicole Lindor
(), North Carolina State University, nllindor@ncsu.edu;
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JoAnn Burkholder
(), North Carolina State University, jburk@ncsu.edu;
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