2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 9:30 AM - 9:45 AM | FINDING A WAY – CYANOBACTERIA BLOOM IN NUTRIENT-ENRICHED LOWLAND BLACKWATER SYSTEMS | 306B
FINDING A WAY – CYANOBACTERIA BLOOM IN NUTRIENT-ENRICHED LOWLAND BLACKWATER SYSTEMS
Coastal Plain blackwater ecosystems are not the most hospitable environments for hosting cyanobacterial blooms. The DOM-enriched dark water color attenuates light rapidly, and large Piedmont rivers entering the lowlands carry high suspended sediment loads that further attenuate light. Regardless, nuisance and toxic blooms of cyanobacteria have apparently been on the increase in nutrient-enriched blackwater systems in recent years. In the lower Cape Fear River blooms of Microcystis form on the surface to avoid light limitation and potentially have first chance at atmospherically-borne nutrients. These blooms have been constrained to years when high flushing did not occur. Blackwater Greenfield Lake is a eutrophic urban system in Wilmington, North Carolina, that previously suffered from dense surface cyanobacterial blooms leading to severe hypoxia. Installation of Solarbee mixers in 2005 substantially reduced the occurrence of surface blooms. However, the blooms morphed from surface habitats into massive Anabaena blooms that permeate the water column, with average chlorophyll a concentrations increasing from 19 to 34 ppb since addition of the mixers. Thus, unless nutrient inputs are strongly curtailed, cyanobacterial blooms will continue to infect such ecosystems.
- C24 Eutrophication
- C36 Water Resource Management
- S20 Understanding physical controls on cyanobacteria dominance: toward prediction and prevention
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Presenters/Authors
Michael Mallin
(), University of North Carolina Wilmington, Center for Marine Science, mallinm@uncw.edu;
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Bradley Saul
(), University of North Carolina Chapel Hill, Department of Biostatistics, saulb@live.unc.edu;
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