Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 101, Issue 5, Pages 611-616Publisher
SPRINGER
DOI: 10.1007/s00128-018-2446-x
Keywords
Stratification; Microcystin; Cyanobacteria; Reservoir; Bonete
Categories
Funding
- UTE
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We analyzed the effects of stratification changes due to wind on the vertical cyanobacteria distribution and microcystin-LR concentrations in a reservoir and assessed the implications for water management. Under stratified conditions, the highest microcystin concentrations (up to 4.16 mu g/L) and toxic cyanobacteria biovolume occurred in the epilimnion (1m). The lowest microcystin concentrations were between 0.02 and 1.28 mu g/L and occurred in the hypolimnion (20m). A cold front passage associated with high wind velocities induced water column mixing, promoting the redistribution of microcystin-LR and cyanobacteria throughout the water column and increasing their concentrations in deeper zones. Microcystin-LR concentration was positively correlated with cyanobacteria biovolume (r=0.747) and chlorophyll a concentration (r=0.798). Changes in thermal profile due to wind would imply a greater challenge for drinking water treatment plants, since high cyanobacterial and microcystin concentrations could reach deep-water intakes.
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