Small‐scale shear effects on heterocystous cyanobacteria

By Pia H. Moisander, James L. Hench, K. Kononen, Hans W. Paerl. 2002

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Do cyanobacteria dominate in eutrophic lakes because they fix atmospheric nitrogen (2004, background): “tive to weather changes, especially turbulent mixing, which may break up filaments (Paerl et al., 1981; Moisander et al., 2002).”
Disaggregation of Microcystis aeruginosa colonies under turbulent mixing: laboratory experiments in a grid-stirred tank (2004, background): “While they have also been used to investigate the impact of shear on cell and colony morphology (Moisander et al., 2002), three-dimensional turbulence is needed to fully investigate and understand the implications of turbulent mixing on break-up of cyanobacterial colonies in the wild.”
Ecology of Harmful Cyanobacteria (2006, methodology): “Increases in turbulence either as stirring or shaking or more welldefined small-scale shear can, however, inhibit CO2- and N2-fixing activities and growth, with excessive turbulence causing disaggregation, cell and filament damage, and rapid death among diverse colonial genera in culture and in natu”
Variability in nitrogen and phosphorus limitation for Baltic Sea phytoplankton during nitrogen-fixing cyanobacterial blooms (2003, background): “The list of potential controlling or limiting factors suggested for N2 fixation in marine environments includes trace elements (Falkowski 1997, Marino et al. 2002), phosphorus (Wu et al. 2000), grazing (Marino et al. 2002), and small-scale shear (Moisander et al. 2002).”