Preventing formation of large colonies and reducing colony size of the cyanobacterium Microcystis may lead to reductions in bloom formation. Here we investigated the effects of artificial mixing on morphology and disaggregation dynamics of Microcystis colonies in vivo, using a stirring device and a laser particle analyzer. The turbulent dissipation rate (ε$\text{ε}$) was varied from 0.020 to 0.364 m² s⁻³. We hypothesized that colonies of M. aeruginosa and M. ichthyoblabe would be more susceptible to disaggregation from turbulent mixing than colonies of M. wesenbergii. Our results showed that colony size of M. aeruginosa and M. ichthyoblabe decreased with increased turbulence intensity and duration of stirring for ε$\text{ε}$ > 0.094 m² s⁻³, while M. wesenbergii showed less obvious changes in colony size with mixing. Spherical M. wesenbergii colonies exposed to high turbulence intensities for 30 min gradually transitioned to colony morphologies similar to M. ichthyoblabe and M. aeruginosa-like colonies (irregular, elongated or lobed, with distinct holes). Our results suggest that turbulent mixing is an important factor driving morphological changes of Microcystis colonies, and artificial mixing may effectively reduce colony size of Microcystis, thereby preventing bloom formation.

防止形成大菌落并减小蓝藻微囊菌的菌落大小可能会导致水华形成减少。在这里，我们使用搅拌装置和激光颗粒分析仪，研究了人工混合对体内微囊藻菌落形态和分解动力学的影响。湍流耗散率（ε$\text{ε}$）从0.020变化到0.364m ²  s ^-3。我们假设铜绿假单胞菌和ichthyoblabe的菌落比韦森伯格氏菌的菌落更易于从湍流混合中分解。我们的结果表明的那菌落大小微囊藻和M. ichthyoblabe搅拌的增加的湍流强度和持续时间减少ε$\text{ε}$> 0.094 m ²  s ^-3，而韦森伯氏菌在混合时菌落大小变化不那么明显。暴露于高湍流强度下30分钟的球形Wesenbergii菌落逐渐转变为类似于ichthyoblabe和M. aeruginosa- like菌落的菌落形态（不规则，细长或浅裂，有明显的孔）。我们的研究结果表明，湍流混合是驱动微囊藻菌落形态变化的重要因素，而人工混合可有效减小微囊藻菌落的菌落大小，从而防止水华形成。