Influence of fluid motion on growth and vertical distribution of cyanobacterium Microcystis aeruginosa

Missaghi, Shahram; Hondzo, Miki; Sun, Chao; Guala, Michele

doi:10.1007/s10452-016-9583-2

Cited by 11 publications

(4 citation statements)

References 40 publications

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“…Despite their wide spread in the TGR, algal blooms rarely occur in cold winter and do not appear in the mainstream (Fu et al, 2010). As local climate conditions and nutrients in the reservoir water have little differences pre-and post-dam construction (Li et al, 2019), the changed hydrodynamic regime is considered by many researchers as the main driver for the algal bloom (Li et al, 2018a;Missaghi et al, 2016;Yang et al, 2018b). Therefore, the effect of the varying hydrodynamic conditions on the algal bloom is the pivot to study the mechanism of algal bloom and develop the control measurements in the TGR (Yang et al, 2013c;Yin et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

The influence of hydraulic characteristics on algal bloom in three gorges reservoir, China: A combination of cultural experiments and field monitoring

et al. 2022

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Section: Introductionmentioning

confidence: 99%

The influence of hydraulic characteristics on algal bloom in three gorges reservoir, China: A combination of cultural experiments and field monitoring

et al. 2022

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“…Microcystis aeruginosa , a unicellular prokaryotic cyanobacterium, is one of the most pervasive and hazardous HCBs species [ 2 ]. Its small colonies (30~100 μm) are vertically distributed in water [ 3 ] and require coagulants (e.g., aluminum salts) together with flocculant aids (e.g., polyacrylamide) to enhance agglomeration [ 4 ]. CFP has also been applied to facilitate the dewatering of microalgal biomass from dilute suspensions through cell aggregation and flocs formation [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Kinetic Measurement of Microalgae Agglomeration for Screening of Polysaccharides-Based Coagulants/Flocculants

Zhou

Jia

Gong

et al. 2022

IJERPH

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Time-resolved monitoring of microalgae agglomeration facilitates screening of coagulants/flocculants (CFs) from numerous biopolymer candidates. Herein, a filtering-flowing analysis (FFA) apparatus was developed in which dispersed microalgal cells were separated from coagulates and flocs formed by CFs and pumped into spectrophotometer for real-time quantification. Polysaccharides-based CFs for Microcystis aeruginosa and several other microalgae were tested. Cationic hydroxyethyl cellulose (CHEC), chitosan quaternary ammonium (CQA) and cationic guar gum (CGG) all triggered coagulation obeying a pseudo-second-order model. Maximal coagulation efficiencies were achieved at their respective critical dosages, i.e., 0.086 g/gM.a. CHEC, 0.022 g/gM.a. CQA, and 0.216 g/gM.a. CGG. Although not active independently, bacterial exopolysaccharides (BEPS) aided coagulation of M. aeruginosa and allowed near 100% flocculation efficiency when 0.115 g/gM.a. CQA and 1.44 g/gM.a. xanthan were applied simultaneously. The apparatus is applicable to other microalgae species including Spirulina platensis, S. maxima, Chlorella vulgaris and Isochrysis galbana. Bio-based CFs sorted out using this apparatus could help develop cleaner processes for both remediation of harmful cyanobacterial blooms and microalgae-based biorefineries.

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“…Conversely, as mixing increases, cyanobacteria can become displaced throughout the water column, as they are no longer able to regulate their buoyancy (Cao et al, ; Reynolds et al, ; Wu & Kong, ). Additionally, physical forcing from the wind (e.g., shear‐induced turbulence) can (i) modulate cyanobacteria metabolism including inorganic carbon uptake and dissolved oxygen production (Wilkinson et al, ), (ii) influence growth rate (Missaghi et al, ), and (iii) disrupt cyanobacteria colonies (Regel et al, ).…”

Section: Introductionmentioning

confidence: 99%

Investigating Abiotic Drivers for Vertical and Temporal Heterogeneities of Cyanobacteria Concentrations in Lakes Using a Seasonal In Situ Monitoring Station

Wilkinson

Hondzo

Guala

2019

Water Resources Research

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Harmful algal blooms (HAB) are ubiquitous ecological and public health hazards because they are composed of potentially toxic freshwater microorganisms called cyanobacteria. The abiotic drivers for toxic HAB are investigated using a research station deployed in a eutrophic lake in Minnesota in 2016. This research station provides full-depth water quality (hourly) and meteorological conditions monitoring (5 min) at the sampling site. Water quality monitoring provides chemical, physical, and biological measurements, that is, phycocyanin concentration, a photosynthetic pigment distinct to cyanobacteria. The high cyanobacteria biovolume (BV) in the epilimnion observed in mid-July persisted until late September when it was distributed uniformly throughout the water column. A scaling relationship was developed among BV heterogeneity, thermal stratification stability, and surface water temperature. This relationship was verified in a dimictic lake the following year. The proposed scaling relationship is relevant to sampling protocols of HAB as it informs if the sample depth is representative of the entire water column. During the strongly stratified period, BV accumulated above the thermocline and in the photic zone, with distinct peaks forming occasionally both near the water surface and at locations with photosynthetically active radiation approximately equal to 10 μE/m 2 s. Our observations suggest that the temporal/vertical variability of cyanobacteria BV is strongly influenced by lake dynamics, thermal structure, seasonal temperature variation, and light availability. These observations demonstrate that cyanobacteria tend to move and accumulate in specific warm water layers, confined by the thermocline and determined by well-defined light conditions.

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Influence of fluid motion on growth and vertical distribution of cyanobacterium Microcystis aeruginosa

Cited by 11 publications

References 40 publications

The influence of hydraulic characteristics on algal bloom in three gorges reservoir, China: A combination of cultural experiments and field monitoring

The influence of hydraulic characteristics on algal bloom in three gorges reservoir, China: A combination of cultural experiments and field monitoring

Time-Resolved Kinetic Measurement of Microalgae Agglomeration for Screening of Polysaccharides-Based Coagulants/Flocculants

Investigating Abiotic Drivers for Vertical and Temporal Heterogeneities of Cyanobacteria Concentrations in Lakes Using a Seasonal In Situ Monitoring Station

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