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Effects of Wind Mixing in a Stratified Water Column on Toxic Cyanobacteria and Microcystin-LR Distribution in a Subtropical Reservoir

  • Mauricio González-PianaEmail author
  • Andrea Piccardo
  • Carolina Ferrer
  • Beatriz Brena
  • Macarena Pírez
  • Daniel Fabián
  • Guillermo Chalar
Article

Abstract

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 µg/L) and toxic cyanobacteria biovolume occurred in the epilimnion (~ 1 m). The lowest microcystin concentrations were between 0.02 and 1.28 µg/L and occurred in the hypolimnion (~ 20 m). 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.

Keywords

Stratification Microcystin Cyanobacteria Reservoir Bonete 

Notes

Acknowledgements

We are grateful to the staff of the Administración Nacional de Usinas y Trasmisiones Eléctricas (UTE), Washington Larregui, Jaime da Silva, and Magdalena Mandiá for their logistical support. This research was partially funded by UTE.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Mauricio González-Piana
    • 1
    Email author
  • Andrea Piccardo
    • 1
  • Carolina Ferrer
    • 1
  • Beatriz Brena
    • 2
  • Macarena Pírez
    • 2
  • Daniel Fabián
    • 1
  • Guillermo Chalar
    • 1
  1. 1.Limnology Section, Institute of Ecology and Environmental Sciences, Faculty of SciencesUniversity of the RepublicMontevideoUruguay
  2. 2.Bioscience Department, Faculty of ChemistryUniversity of the RepublicMontevideoUruguay

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