Most treatments to control freshwater algal blooms are not effective: Meta-analysis of field experiments

Anantapantula, Saranya S.; Wilson, Alan E.

doi:10.1016/j.watres.2023.120342

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…Finally, questions related to governance and management model assumptions related to how cyanobacteria risks are communicated, which levels are deemed sufficient for public information dissemination, and who in the community is advised (when, how, and why), expose systemic limitations that require further investigation. The emergence of tropical cyanobacteria species in non-tropical areas [63], record-breaking rain and flooding events followed by drought [67], post-fire support for environment recovery [68], endangered species [69], P-nutrient stewardship [70], and effective large scale treatment of blooms [71] are elements that could be incorporated into a more holistic Lake Hume management plan. Likewise, international water management trends, such as incorporating professional engagement with local communities and using research by 'honest brokers' [72], might be considered.…”

Section: Discussionmentioning

confidence: 99%

Bloomin’ Ridiculous: Climate Change, Water Contamination and Algal Blooms in a Land Down Under

Crampton,

Ragusa

2023

Hydrology

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Climate and anthropogenic change, particularly agricultural runoff, increase blue-green algae/cyanobacteria blooms. This article researches cyanobacteria alert-level identification, management, and risk communication in Lake Hume, Australia. Two methods, document and content analysis, evidence contamination events and risk communication, reflect water governance and data management limitations. Results found that Lake Hume had amber or red alerts for only one week, December 2021–December 2022. This failed to prevent government tourism promotion of recreational usage, contravening water authority red alert advice. Lake-use restrictions lacked compliance enforcement. Events during amber alerts lacked risk communication to vulnerable populations (children). Lake Hume’s governance by the Murray–Darling Basin Authority restricted risk communication to one authority that reproduced generic advice in minimal outlets/time points. Geophysical signage failed to address diversity needs (language, literacy, age, and disabilities). No risk communication was found for residents with diseases exacerbated by aerosolization. Despite WHO promoting cyanotoxin investigation, Australian research is absent in international literature. Further, Lake Hume cyanobacteria produce potentially carcinogenic microcystein. This coexists with census data revealing cancer rates higher than the national average in a waterside town. The results demonstrate the need to incorporate robust public health risk assessments, communication, and management into water management and advocate international legislation changes based on evidence-based research to reduce blooms and prevent agricultural runoff.

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Section: Discussionmentioning

confidence: 99%

Bloomin’ Ridiculous: Climate Change, Water Contamination and Algal Blooms in a Land Down Under

Crampton,

Ragusa

2023

Hydrology

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“…Various strategies have been tested to prevent or control freshwater cyanobacterial blooms with variable success rates depending on the type of environment, but most of these strategies are not effective under eld conditions (Anantapantula and Wilson, 2023). These include chemical, physical or biological (mostly plant-based) agents with long-or short-term effects on the improvement of water quality.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of bloom control strategies include the application of phosphate-adsorptive materials to lakes (Douglas et al, 2016), the use of macrophytes that compete for resources and release substances that inhibit cyanobacterial growth (Maredová et al, 2021), arti cial mixing of the water column (Visser et al, 2018) and biomanipulation of biotic interactions involving sh, macrophytes or zooplankton (Triest et al, 2016). Once a bloom is established, cyanobacterial cells can be brie y suppressed using conventional algaecides such as copper sulfate (Anantapantula and Wilson, 2023).…”

Section: Introductionmentioning

confidence: 99%

Compositional Changes and Ecotoxicological Aspects of Hydrogen Peroxide Application to a Natural Plankton Community

Santos,

Silva,

Azevedo

et al. 2024

Preprint

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Cyanobacterial blooms compromise water quality worldwide, demanding nutrient input control. However, once established, other strategies are necessary to control the growth of cyanobacteria. Oxidation processes such as hydrogen peroxide (H2O2) offer a potential solution; however, research on planktonic community recovery post-H2O2 exposure is limited. Here, we investigated the impact of the addition of H2O2 alone at various concentrations (1, 10, and 100 mg/L) on the natural phytoplankton and bacterioplankton communities of a eutrophic reservoir over 21 days under laboratory conditions. We aimed to evaluate the differential susceptibility of cyanobacteria and green algae, possible phytoplankton regrowth, changes in bacterioplankton composition and the effect of residual H2O2 or its byproducts on organisms at different trophic levels. Initially, cyanobacteria (mainly Microcystis and Cyanobium) were the main contributors to chlorophyll (Chl) concentrations, followed by green algae. Within 7 days, the phytoplankton abundance decreased under all conditions, with pronounced effects occurring in the H2O2 treatments within the first 48 hours. H2O2 exposure led to residual Chl concentrations for cyanobacteria and green algae, and after fresh culture medium addition, green algae, but not cyanobacteria, were able to regrow in the <10 mg/L treatment. At lower H2O2 concentrations, Microcystis, Cyanobium, Limnothrix, and Planktothrix resisted, while at higher concentrations, Cyanobium and Mastigocladopsis persisted. In the bacterioplankton community, H2O2 addition led to a greater abundance of taxa from the hgcI clade, Comamonadaceae family, Craurococcus-Caldovatus and Staphylococcus. Ecotoxicological assays revealed transient effects of H2O2 on Daphnia similis survival, while Danio rerio remained unaffected. Our findings demonstrate that, compared with cyanobacteria, green algae exhibit greater resistance and resilience to H2O2, with transient effects on zooplankton at concentrations up to 10 mg/L. This research underscores the complexity of managing cyanobacterial blooms and emphasizes the need for comprehensive strategies considering ecological impacts.

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Flocculation-enhanced photobiological hydrogen production by microalgae: Flocculant composition, hydrogenase activity and response mechanism

Wang,

Chen,

Guo

et al. 2024

Chemical Engineering Journal

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Most treatments to control freshwater algal blooms are not effective: Meta-analysis of field experiments

Cited by 9 publications

References 34 publications

Bloomin’ Ridiculous: Climate Change, Water Contamination and Algal Blooms in a Land Down Under

Bloomin’ Ridiculous: Climate Change, Water Contamination and Algal Blooms in a Land Down Under

Compositional Changes and Ecotoxicological Aspects of Hydrogen Peroxide Application to a Natural Plankton Community

Flocculation-enhanced photobiological hydrogen production by microalgae: Flocculant composition, hydrogenase activity and response mechanism

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