Microbial Ecology

, Volume 67, Issue 2, pp 465–479

Role of Environmental Factors and Toxic Genotypes in the Regulation of Microcystins-Producing Cyanobacterial Blooms

  • Ilona Gągała
  • Katarzyna Izydorczyk
  • Tomasz Jurczak
  • Jakub Pawełczyk
  • Jarosław Dziadek
  • Adrianna Wojtal-Frankiewicz
  • Adam Jóźwik
  • Aleksandra Jaskulska
  • Joanna Mankiewicz-Boczek
Genes and Genomes

DOI: 10.1007/s00248-013-0303-3

Cite this article as:
Gągała, I., Izydorczyk, K., Jurczak, T. et al. Microb Ecol (2014) 67: 465. doi:10.1007/s00248-013-0303-3

Abstract

The aim of this study was to understand: (1) how environmental conditions can contribute to formation of Microcystis-dominated blooms in lowland, dam reservoirs in temperate climate—with the use of quantitative molecular monitoring, and (2) what is the role of toxic Microcystis genotypes in the bloom functioning. Monitoring of the Sulejow Reservoir in 2009 and 2010 in two sites Tresta (TR) and Bronislawow BR), which have different morphometry, showed that physicochemical conditions were always favorable for cyanobacterial bloom formation. In 2009, the average biomass of cyanobacteria reached 13 mg L−1 (TR) and 8 mg L−1 (BR), and in the second year, it decreased to approximately 1 mg L−1 (TR and BR). In turns, the mean number of toxic Microcystis genotypes in the total Microcystis reached 1 % in 2009, both in TR and BR, and in 2010, the number increased to 70 % in TR and 14 % in BR. Despite significant differences in the biomass of cyanobacteria in 2009 and 2010, the mean microcystins (MCs) concentration and toxicity stayed at a similar level of approximately 1 μg L−1. Statistical analysis indicated that water retention time was a factor that provided a significant difference between the two monitoring seasons and was considered a driver of the changes occurring in the Sulejow Reservoir. Hydrologic differences, which occurred between two studied years due to heavy flooding in Poland in 2010, influenced the decrease in number of Microcystis biomass by causing water disturbances and by lowering water temperature. Statistical analysis showed that Microcystis aeruginosa biomass and 16S rRNA gene copy number representing Microcystis genotypes in both years of monitoring could be predicted on the basis of total and dissolved phosphorus concentrations and water temperature. In present study, the number of mcyA gene copies representing toxic Microcystis genotypes could be predicted based on the biomass of M. aeruginosa. Moreover, MCs toxicity and concentration could be predicted on the basic of mcyA gene copy number and M. aeruginosa (biomass, 16S rRNA), respectively. Present findings may indicate that Microcystis can regulate the number of toxic genotypes, and in this way adjust the whole bloom to be able to produce MCs at the level which is necessary for its maintenance in the Sulejow Reservoir under stressful hydrological conditions.

Supplementary material

248_2013_303_MOESM1_ESM.pdf (627 kb)
Online Resource 1(PDF 627 kb)
248_2013_303_MOESM2_ESM.pdf (437 kb)
Online Resource 2(PDF 436 kb)
248_2013_303_MOESM3_ESM.pdf (187 kb)
Online Resource 3(PDF 187 kb)
248_2013_303_MOESM4_ESM.pdf (193 kb)
Online Resource 4a(PDF 193 kb)
248_2013_303_MOESM5_ESM.pdf (193 kb)
Online Resource 4b(PDF 193 kb)

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Ilona Gągała
    • 1
  • Katarzyna Izydorczyk
    • 1
  • Tomasz Jurczak
    • 2
  • Jakub Pawełczyk
    • 3
  • Jarosław Dziadek
    • 3
  • Adrianna Wojtal-Frankiewicz
    • 2
  • Adam Jóźwik
    • 4
  • Aleksandra Jaskulska
    • 1
    • 2
  • Joanna Mankiewicz-Boczek
    • 1
    • 2
  1. 1.European Regional Centre for Ecohydrology of the Polish Academy of SciencesLodzPoland
  2. 2.Department of Applied EcologyUniversity of LodzLodzPoland
  3. 3.Institute of Medical Biology of the Polish Academy of SciencesLodzPoland
  4. 4.Institute of Biocybernetics and Biomedical Engineering of the Polish Academy of SciencesWarsawPoland

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