Managing the Invasive Cyanobacterium Lyngbya wollei in a Southeastern USA Reservoir: Evaluation of a Multi-year Treatment Program

Willis, Ben E.; Gravelie, Joseph T.; Bishop, West M.; Buczek, Sean B.; Cope, W. Gregory

doi:10.1007/s11270-020-04532-y

Cited by 2 publications

(1 citation statement)

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“…Microseira wollei (previously classified as Lyngbya wollei) is a benthic, nitrogen-fixing cyanobacteria and is a documented problem in shallow fresh and brackish waters around the world. − Blooms of M. wollei take the form of large, dense mats, usually near the shore of affected lakes or rivers, with mat densities capable of exceeding 5 kg biomass/m 2 of affected sediment (Figure S1).…”

Section: Introductionmentioning

confidence: 99%

Shoreline Drying of Microseira (Lyngbya) wollei Biomass Can Lead to the Release and Formation of Toxic Saxitoxin Analogues to the Water Column

Metz

Putnam

Scott

et al. 2022

Environ. Sci. Technol.

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The harmful, filamentous cyanobacteria Microseira (Lyngbya) wollei produces several toxic analogues of saxitoxin (Lyngbya wollei toxins 1–6, or LWTs 1–6), grows in shallow water, and can deposit significant biomass on nearby shorelines. Here, we show that the LWTs are stable in the biomass during subsequent drying but that the process facilitates the later release of LWTs upon return to the water column. Under basic conditions, LWTs hydrolyzed to generate products that were significantly more neurotoxic than the initial toxins. Aqueous LWTs were subjected to conditions of covarying temperature and pH, and their degradation rates and products were determined at each condition. LWTs 1, 5, and 6 degraded faster at pH ≥ 8 at all temperatures. Their degradation products, which included decarbamoyl saxitoxin and LWT 4, were consistent with a base-catalyzed hydrolysis mechanism and represented a net increase in total biomass toxicity normalized against the equivalent toxicity of saxitoxin. The corresponding pre-exponential terms and activation energies for hydrolysis were obtained for pH 6–10 over the temperature range 10–40 °C. A locally weighted scatterplot smoothing (LOWESS) regression was developed to predict the loss of parent toxins and subsequent products in the water column under conditions corresponding to those commonly encountered in cyanobacterial blooms.

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