Intermittent disturbance benefits colony size, biomass and dominance of Microcystis in Lake Taihu under field simulation condition

Yang, Guijun; Tang, Xiangming; Wilhelm, Steven W.; Pan, Wenwen; Zheng, Rui; Xu, Lei; Zhong, Caihong; Hu, Xiquan

doi:10.1016/j.hal.2020.101909

Cited by 22 publications

(13 citation statements)

References 38 publications

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Section: Discussionmentioning

confidence: 99%

“…Then the effect of frequency and intensity of disturbance on the algal shift was considered [27][28][29] . The intensity of disturbance can affect the growth of Microcystis by changing the absorption and utilization of P by Microcystis 27 .…”

Section: Discussionmentioning

confidence: 99%

“…The intensity of disturbance can affect the growth of Microcystis by changing the absorption and utilization of P by Microcystis 27 . The disturbance frequency can affect the algal shift, including that continuous hydrodynamic mixing weakens the dominance of Microcystis 28 and intermittent disturbance benefits colony size, biomass and dominance of Microcystis in Lake Taihu under simulated field conditions 29 . www.nature.com/scientificreports/ However, the effect from the biomass of bloom-forming colonial Microcystis was not reviewed by Visser et al 19 , as few researches payed attention to effects from algal biomass 16 .…”

Section: Discussionmentioning

confidence: 99%

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The biomass of bloom-forming colonial Microcystis affects its response to aeration disturbance

Wang

Qin

Tang

et al. 2022

Sci Rep

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The algal succession in Microcystis blooms of varying biomass under continuous aeration was studied in a greenhouse. There were four treatments (control, Low, Medium, and High) with initial chlorophyll a (Chl-a) of 32.5, 346.8, 1413.7, and 14,250.0 μg L−1, respectively. During the experiment, Cyanophyta biomass was the lowest in the Medium treatment (P < 0.05), while its Chlorophyta biomass was the highest (P < 0.05). Both Chlorophyta and Bacillariophyta biomass were the lowest in the High treatment (P < 0.05). Bacillariophyta biomass, particularly the diatom Nitzschia palea was the highest in the Low treatment (P < 0.05), and Nitzschia palea cells were attached to the Microcystis colonies. Thus, the algal shift in Microcystis blooms under aeration disturbance depends on its initial biomass, and it shift to green algae or/and diatom dominance in the control, Low, Medium treatments. Diatom cells, particularly N. palea, grew in an attached form on Microcystis colonies in treatment Low, in which the colonies provided media for the adherence. The mechanism of the algal shift with different biomass must be related to the nutrient level, low light and aerobic conditions under aeration disturbance as well as the aeration itself, which destroyed the Microcystis colonies’ advantage of floating on the water.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The biomass of bloom-forming colonial Microcystis affects its response to aeration disturbance

Wang

Qin

Tang

et al. 2022

Sci Rep

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“…In a laboratory mesocosm experiment, Wu et al ( 2019 ) found that increasing wind (up to 3.6 m/s) increased the volumetric median colony diameter at the water surface. Field experiments by Yang et al ( 2020 ) found that intermittent wind‐induced disturbance favored (i) larger colony sizes, (ii) higher biomass, and (iii) stronger dominance of Microcystis over constant quiescent or constant wind conditions. We believe this result agrees nicely with our conclusion that wind is necessary to promote aggregation, quiescent conditions are necessary for algal growth, and the combination of the two in subsequent order is a recipe for a harmful algal bloom.…”

Section: Discussionmentioning

confidence: 99%

“…We would expect slower frequencies of wind mixing to result in more opportunities for growth at the water surface during low wind conditions, leading to faster aggregation, which would cause a discrepancy between slow frequency and high‐frequency wind mixing not currently demonstrated in this model. Recall that Yang et al ( 2020 ) determined that intermittent disturbance not only promoted aggregation in M. aeruginosa but total biomass as well.…”

Section: Discussionmentioning

confidence: 99%

A theoretical modeling framework for motile and colonial harmful algae

Taylor

Calderer

Hondzo

et al. 2022

Ecology and Evolution

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Climate change is leading to an increase in severity, frequency, and distribution of harmful algal blooms across the globe. For many harmful algae species in eutrophic lakes, the formation of such blooms is controlled by three factors: the lake hydrodynamics, the vertical motility of the algae organisms, and the ability of the organisms to form colonies. Here, using the common cyanobacterium Microcystis aeruginosa as an example, we develop a model that accounts for both vertical transport and colony dynamics. At the core of this treatment is a model for aggregation. For this, we used Smoluchowski dynamics containing parameters related to Brownian motion, turbulent shear, differential setting, and cell‐to‐cell adhesion. To arrive at a complete description of bloom formation, we place the Smoluchowski treatment as a reaction term in a set of one‐dimensional advection‐diffusion equations, which account for the vertical motion of the algal cells through molecular and turbulent diffusion and self‐regulating buoyant motion. Results indicate that Smoluchowski aggregation qualitatively describes the colony dynamics of M. aeruginosa . Further, the model demonstrates wind‐induced mixing is the dominant aggregation process, and the rate of aggregation is inversely proportional to algal concentration. Because blooms of Microcystis typically consist of large colonies, both of these findings have direct consequences to harmful algal bloom formation. While the theoretical framework outlined in this manuscript was derived for M. aeruginosa , both motility and colony formation are common among bloom‐forming algae. As such, this coupling of vertical transport and colony dynamics is a useful step for improving forecasts of surface harmful algal blooms.

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Biotechnological approaches for suppressing Microcystis blooms: insights and challenges

Kang,

Jeong,

et al. 2024

Appl Microbiol Biotechnol

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Intermittent disturbance benefits colony size, biomass and dominance of Microcystis in Lake Taihu under field simulation condition

Cited by 22 publications

References 38 publications

The biomass of bloom-forming colonial Microcystis affects its response to aeration disturbance

The biomass of bloom-forming colonial Microcystis affects its response to aeration disturbance

A theoretical modeling framework for motile and colonial harmful algae

Biotechnological approaches for suppressing Microcystis blooms: insights and challenges

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