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Fate of cyanobacterial hepatotoxins in artificial recharge of groundwater and in bank filtration
Published in Jos H. Peters, Artificial Recharge of Groundwater, 2020
K. Lahti, J. Vaitomaa, A-L. Kivimaki, K. Sivonen
Concentration of microcystins in the upper 2 metres of lake Rehtijärvi ranged from less than 0.1 to 1.9 µg l-1 during the period from July to October 1997. Dominance of Planktothrix agardhii corresponded with microcystin occurrence (Fig. 7). Microcystins and cyanobacterial cells were occasionally detected in samples taken from the observation tubes and the pumping well. The distance from the lake to the intake well was 0.1 km. However, the concentrations of microcystins were usually below 0.1 µg l-1 (0.03 – 0.32 µg l-1) determined both with immunoassay and HPLC. A few cyanobacteria belonging to Oscillatoriales, Chroococcales and Nostocales were detected in every sample taken from the pumping well.
Quantifying the role of organic phosphorus mineralisation on phytoplankton communities in a warm-monomictic lake
Published in Inland Waters, 2019
Matthew J. Prentice, David P. Hamilton, Anusuya Willis, Katherine R. O'Brien, Michele A. Burford
Collectively, the cyanobacterial assemblage in the surface waters of all sites (1–4) comprised 40 taxa representing 4 orders: synechococcales (18 taxa), chroococcales (10), nostocales (9), and oscillatoriales (3). Abundance and biovolume increased from October through December before decreasing in January (Fig. 2d, Site 4 shown; Fig. 4a–b). Nostacales and synechococcales were overwhelmingly dominant (Fig. 5a–b). The N-fixing nostocales comprised a mean biovolume of 1.60 mm3 L−1 (60% share; Fig. 5b) and represented 5 of the 10 most dominant cyanobacteria by biovolume, including the toxic R. raciborskii (Table 2), and typically increased in biovolume from October through December before decreasing in January. Synechococcales comprised a mean biovolume of 0.84 mm3 L−1 (34%; Fig. 5b), representing 4 of the 10 most dominant cyanobacteria by biovolume (Table 2), and increased in biovolume from October through December before decreasing in January.