Non-microcystin producing Microcystis wesenbergii (Komárek) Komárek (Cyanobacteria) representing a main waterbloom-forming species in Chinese waters

Rapid quantification of total microcystins in cyanobacterial samples by periodate-permanganate oxidation and reversed-phase liquid chromatography

“…The variation among lakes that was observed may indicate that the dominant species of Microcystis produced different levels of toxins. For example, Microcystis wesenbergii has been shown to be a non-MC producer [51]. Conversely, concentrations of MCs in cyanobacterial bloom samples also varied with time (Table 3), as indicated by the concentrations of MCs from cyanobacterial samples obtained from the same locations of Dianchi Lake during different years.…”

Seasonal dynamics of water bloom-forming Microcystis morphospecies and the associated extracellular microcystin concentrations in large, shallow, eutrophic Dianchi Lake

“…The study above had indicated the dominant Microcystis species were identified as M. wesenbergii, M. ichthyoblabe and M. viridis. M. wesenbergii was one of the most dominant waterbloom-forming microcystis morphospecies from May to December (ranged between 25% and 42%), but were not shown to contain MC synthesis gene or MC by both molecular and chemical methods (Xu et al, 2008a(Xu et al, , 2008bOzawa et al, 2005). M. viridis dominated almost throughout the study, and the proportion of total Microcystis varied between 35% and 87%.…”

“…Interestingly, although the abundance of Microcystis was relatively high in Dianchi Lake (> 1.0 × 10 9 cells/L), the cellbound and extracellular MC concentrations were significant lower than the MC concentrations in raw drinking water samples from Taihu Lake and Chaohu Lake in China (Peng, 2012;Zheng et al, 2004;Song et al, 2007;Xu et al, 2008aXu et al, , 2008b. Although our research indicated that MC was correlated positively with WT, pH and DO, the MC concentrations could be probably associated with Microcystis morphospecies and colony size in Dianchi Lake.…”

How to mitigate cyanobacterial blooms and cyanotoxin production in eutrophic water reservoirs?

“…Interestingly, in the lakes with the single water-level regulation microcystins -LF, -RR and -LR were the dominant variants produced by a mixture of three species of Microcystis and M. wesenbergii seemed to be the main producer of MC-LF. MC production by this species was rarely reported: MC-LA was suggested by Monchamp et al (2014), while some European and Chinese strains did not produce MC at all (ViaOrdorika et al, 2004;Xu et al, 2008). The variability of the production of MC variants presented in this work is characteristic not only for Microcystis spp.…”