Isolation of viable cell mass from frozen Microcystis viridis bloom containing microcystin-RR

Gábor Vasas, István Bácsi, Gyula Surányi, Márta Mikóné Hamvas, Csaba Máthé, Sándor Alex Nagy, György Borbély

Research output: Contribution to journalArticle

10 Citations (Scopus)


Cyanobacterial species commonly occur in the phytoplankton of freshwater lakes and sometimes develop as toxin-producing blooms. Microcystis is one of the most common genera of freshwater cyanobacteria and is often the dominating phytoplankton of eutrophic lakes all over the world. In eutrophic lakes, large amounts of Microcystis may overwinter in the sediment and re-inoculate the water column in spring. In most cases, the overwintering pelagic population-if it exists-is small, and its role in re-inoculation has not been clear yet. In December 2005, we found large amounts of Microcystis on the surface, frozen in the ice cover in a eutrophic pond (Pond Hármashegy, Hungary). We identified the Microcystis species and investigated the viability and the toxicity of the frozen cells. The dominant species in the bloom samples was Microcystis viridis. Viability tests showed that the colonies isolated from the ice cover were composed of living cells. The isolated strain was found toxic, we analyzed the microcystin composition in the frozen planktonic Microcystis mass; in the investigated samples microcystin-RR was the main cyanotoxin.

Original languageEnglish
Pages (from-to)147-151
Number of pages5
Issue number1
Publication statusPublished - Jan 1 2010


  • Microcystin-RR
  • Microcystis viridis
  • Overwintering
  • Pelagic population

ASJC Scopus subject areas

  • Aquatic Science

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