Summer changes in cyanobacterial bloom composition and microcystin concentration in eutrophic Czech reservoirs

Environmental Toxicology
Petr ZnachorEliska Zapomelová

Abstract

In mid-July and August 2003 and 2004, 18 reservoirs in the Czech Republic were sampled for phytoplankton species composition and concentration of intracellular microcystins (MCs). As a consequence of high nutrient loading, most of the reservoirs experienced cyanobacterial blooms of various intensities, with the prevalence of cyanobacteria increasing markedly in August, along with a conspicuous shift in species composition toward dominance of Microcystis spp. Microcystins were detected in 90% of the samples, and their amount also increased considerably in August, reflecting the cyanobacterial biomass. In Microcystis-dominated samples, a significantly higher amount of MCs (p < 0.001) occurred than in samples in which other taxa prevailed. Microcystins were positively correlated with chlorophyll a and cyanobacterial biovolume (p < 0.05, R2 = 0.61 and 0.66, respectively), with the strongest correlation found for Microcystis spp. biovolume (p < 0.001, R2 = 0.87). This taxon was the most important producer of MCs in Czech reservoirs. The main structural variants of MCs were MC-LR, MC-RR, and MC-YR. This study's data also indicate that the relative share of MC variants (MC-LR and MC-RR) varies considerably with time, most likely as a ...Continue Reading

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Citations

Dec 13, 2012·Environmental Monitoring and Assessment·Som Cit SinangAnas Ghadouani
Mar 25, 2014·Environmental Science and Pollution Research International·Daniel JančulaPavel Babica
Feb 1, 2011·Environmental Microbiology Reports·Susie A WoodDaniel R Dietrich
Apr 10, 2015·Environmental Science and Pollution Research International·Zakaria A MohamedWesam M El-Raghi
Jan 7, 2014·Toxicon : Official Journal of the International Society on Toxinology·Amber F RoegnerGualberto Gonzalez-Sapienza
May 21, 2009·FEMS Microbiology Ecology·Zakaria A Mohamed, Abdulrahman M Al Shehri
Mar 17, 2007·Environmental Toxicology·Angeline R TillmannsRocio Aranda-Rodriguez
Jan 8, 2020·Environmental Science and Pollution Research International·Lisa SpoofJussi Meriluoto
Dec 14, 2011·Journal of Environmental Monitoring : JEM·A ZamyadiS Dorner
Jul 28, 2019·Archives of Toxicology·Zorica SvirčevGeoffrey A Codd
Mar 7, 2021·International Journal of Environmental Research and Public Health·Wenqing XiaoKangding Gu
Jan 6, 2018·Environmental Science & Technology·Eun-Hee LeeAhjeong Son

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