Rapid horizontal accumulation and bloom formation of the cyanobacterium Microcystis under wind stress

Chen, Huaimin; Zhu, Wei; Wang, Ruochen; Feng, Ganyu; Xue, Zhaohui

doi:10.1007/s10750-022-05048-8

Cited by 10 publications

(7 citation statements)

References 53 publications

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“…The observed trends can be attributed to the sinking of algal colonies under wind-induced turbulent forces. ,− These colonies reach a balance between buoyancy and turbulence − and drift with water currents. To demonstrate this, we used a one-dimensional (1D) hydrodynamic model and a recent in situ observational study to simulate vertical wind-induced current profiles (Text S3 of the Supporting Information). Results showed that the current velocity decreases with depth, especially in the upper layers (Figure S8 of the Supporting Information).…”

Section: Results and Discussionmentioning

confidence: 99%

“…This is consistent with a recent field study where the peak total horizontal biomass transport rate was observed at a wind speed of 2.1 m/s. 3 The observed trends can be attributed to the sinking of algal colonies under wind-induced turbulent forces. 14,27−30 These colonies reach a balance between buoyancy and turbulence 31−33 and drift with water currents.…”

Section: Abd Data Sets For Four Lakesmentioning

confidence: 99%

“…For instance, in situ observations in Lake Taihu have shown that, at wind speeds of <2.1 m/s, 60−77% of the total horizontally transported algal biomass within the water column is found within the top 1 cm layer. 3 2.7. Quantifying the Drift-Induced Bloom Accumulation in Lake Taihu.…”

Section: Algal Biomass Transport Index (Abti)mentioning

confidence: 99%

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Satellite Tracking Reveals the Speed Up of the Lacustrine Algal Bloom Drift in Response to Climate Change

Wang,

Li,

Ning

et al. 2024

Environ. Sci. Technol.

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Satellite evidence indicates a global increase in lacustrine algal blooms. These blooms can drift with winds, resulting in significant changes of the algal biomass spatial distribution, which is crucial in bloom formation. However, the lack of long-term, largescale observational data has limited our understanding of bloom drift. Here, we have developed a novel method to track the drift using multi-source remote sensing satellites and presented a comprehensive bloom drift data set for four typical lakes:

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Section: Results and Discussionmentioning

confidence: 99%

Section: Abd Data Sets For Four Lakesmentioning

confidence: 99%

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Satellite Tracking Reveals the Speed Up of the Lacustrine Algal Bloom Drift in Response to Climate Change

Wang,

Li,

Ning

et al. 2024

Environ. Sci. Technol.

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“…1). The ow eld data were collected every 13 cm from the water surface every 1 s, and the velocities at X (east), Y (north), and Z (depth) were recorded (Chen et al, 2022).…”

Section: Field Observationmentioning

confidence: 99%

Wind-driven hydrodynamic characteristics of Lake Taihu, a large shallow lake in China

Xue,

Zhu,

Cheng

et al. 2024

Environ Sci Pollut Res

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As an essential drinking water source and one of the largest eutrophic shallow lakes in China, the management of Lake Taihu requires an adequate understanding of its hydrodynamic characteristics. Studying the hydrodynamic characteristics of Lake Taihu based on eld observations is limited owing to its large area and the lack of ow eld stability. Previous studies using hydrodynamic models experienced challenges, such as dimensionality and lack of dynamic response analysis between ow eld and realistic wind; therefore, the results were still inconclusive. In this study, a 3D model of Lake Taihu, calibrated and validated based on eld observations, was used to simulate and compare three scenarios: windless, steady wind, and realistic wind. The hydrodynamic characteristics of Lake Taihu were analyzed as close to the actual conditions as possible. The results showed that wind-driven currents dominated the ow eld in Lake Taihu, and the horizontal velocity driven by wind was more than 6 times that without wind. Observing a stable ow eld in Lake Taihu was di cult because of the variability of realistic wind. The hydrodynamic characteristics of Lake Taihu were de ned as "strongly affected by wind", "higher on the surface and smaller at the bottom", and "difference between the surface and the bottom". Vertical turbulent kinetic energy can be used to characterize the variable ow eld of a winddriven lake and has a positive correlation with wind speed. Therefore, it could be used as a key component to predict water blooms with practical implications.

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“…Wind-generated turbulence can vertically disperse surface scum to deeper depths and reduce the light availability for Microcystis when the wind speed exceeds a critical value (2.6-3 m s -1 ) ( Cao et al., 2006 ; Wu et al., 2015 ). Below the critical wind speed, wind-generated flow leads to the accumulation of Microcystis in downwind areas of the basin ( Chen et al., 2023 ). Although the flows generated by wind, including basin-scale circulation, waves and turbulent eddies exceed the size of Microcystis colonies by far, these motions are coupled through the turbulent cascade to the small-scale viscous environment of cells and colonies ( Regel et al., 2004 ).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Microcystis surface scum formation under different wind conditions: the role of hydrodynamic processes at the air-water interface

Wu,

Rovelli

et al. 2024

Front. Plant Sci.

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Due to climate change, Microcystis blooms occur at increasing frequencies in aquatic ecosystems worldwide. Wind-generated turbulence is a crucial environmental stressor that can vertically disperse the Microcystis surface scum, reducing its light availability. Yet, the interactions of Microcystis scum with the wind-generated hydrodynamic processes, particularly those at the air-water interface, remain poorly understood. Here, we explore the response of Microcystis (including colony size and migration dynamics) to varying magnitudes and durations of intermittent wind disturbances in a mesocosm system. The flow velocities, size of Microcystis colonies, and the areal coverage of the water surface by scum were measured through video observations. Our results demonstrate that low wind speeds increase colony size by providing a stable condition where Microcystis forms a scum layer and aggregates into large colonies at the air-water interface. In contrast, wind disturbances disperse scum and generate turbulence, resulting in smaller colonies with higher magnitudes of wind disturbance. We observed that surface scum can form rapidly following a long period (6 h) of high-magnitude (4.5 m s-1) wind disturbance. Furthermore, our results indicate reduced water surface tension caused by the presence of Microcystis, which can decrease surface flow velocity and counteract wind-driven mixing. The reduced surface tension may also drive lateral convection at the water surface. These findings suggest that Microcystis reduces surface tension, likely by releasing surface-active materials, as an adaptive response to various wind conditions. This could result in an increased rate of surface scum re-formation under wind conditions and potentially facilitate the lateral expansion of scum patches during weak wind periods. This study reveals new insights into how Microcystis copes with different wind conditions and highlights the importance of the air-water interface for Microcystis scum dynamics.

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Rapid horizontal accumulation and bloom formation of the cyanobacterium Microcystis under wind stress

Cited by 10 publications

References 53 publications

Satellite Tracking Reveals the Speed Up of the Lacustrine Algal Bloom Drift in Response to Climate Change

Satellite Tracking Reveals the Speed Up of the Lacustrine Algal Bloom Drift in Response to Climate Change

Wind-driven hydrodynamic characteristics of Lake Taihu, a large shallow lake in China

Dynamics of Microcystis surface scum formation under different wind conditions: the role of hydrodynamic processes at the air-water interface

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