Summer cyanoprokaryote blooms in eleven reservoirs in South Bulgaria (2019)

Abstract

Forty taxa from the Cyanoprokaryota division were identified in eleven reservoirs in South Bulgaria, and seventeen of them dominated by biomass in 2019. The potential producers of cyanotoxinsMicrocystis aeruginosa,Microcystis wesenbergii, Dolichospermum spiroides and Planktothrix agardhii caused intense blooms. Cyanoprokaryote blooms persisted throughout the summer, and their contribution to the total phytoplankton biomass varied from 15 to 100%. In September, in the Sinyata Reka reservoir, the biomass o f Microcystis aeruginosa reached 35.3 mg L'1, and o f Microcystis wesenbergii - 10.5 mg L-l. In Novo Zhelezare reservoir in July the biomass of Dolichospermum spiroides reached 18.81 mg L'1, and Planktothrix agardhii in August -16.8 mg L'1.

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