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• W2578751172 abstract "Copper exposures from algaecide applications in aquatic systems are hypothesized to impede bacterial degradation of microcystin (MC), a cyanobacterial produced hepatotoxin. Despite regulatory implications of this hypothesis, limited data exist on influences of copper-exposures on MC-degrading bacteria and consequent MC-degradation. In this study, influences of copper-algaecide concentrations and formulations on bacterial composition and microcystin-LR (MCLR) degradation were investigated. Microcystis aeruginosa was exposed to four concentrations (0–5.0 mg Cu L−1) of three copper-algaecide formulations, and rates and extents of MCLR degradation were measured. In untreated controls and following exposures of 0.1, 0.5, and 1.0 mg Cu L−1, MCLR concentrations decreased at a rate of ∼41–53 μg MCLR/L d−1. Following exposure to 5.0 mg Cu L−1 MCLR degradation rates decreased an order of magnitude to ∼3–7 μg MCLR/L d−1. Bacterial diversity decreased following copper-exposures greater than 0.1 mg Cu L−1 for all formulations. Relative abundance of certain groups of MC-degrading bacteria identified in treatments increased with increasing copper concentration, suggesting they may be less sensitive to copper exposures than other, MCLR and non MC-degrading heterotrophic bacteria present in the assemblage. Results from this study revealed that copper concentration can influence degradation rates of MCLR, however this influence was not significant within copper concentrations currently registered for use (≤1.0 mg Cu L−1) of the tested algaecides. Copper formulation did not significantly alter degradation rates or bacterial composition. These data augment our understanding of the influences of copper algaecide-exposures on MCLR degradation, and can be used to inform more accurate risk evaluations and use of copper-algaecides for management of MCLR-producing cyanobacteria." @default.
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• W2578751172 date "2017-05-01" @default.
• W2578751172 modified "2023-09-23" @default.
• W2578751172 title "Influence of CuSO 4 and chelated copper algaecide exposures on biodegradation of microcystin-LR" @default.
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• W2578751172 doi "https://doi.org/10.1016/j.chemosphere.2017.01.079" @default.
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