Freshwater periphyton response to technical-grade and two commercial formulations of glyphosate

Juárez, Ángela Beatriz; Krug, C. Pamela; Santos, Marina; Vera, María Solange

doi:10.25260/ea.19.29.1.0.816

Cited by 9 publications

(8 citation statements)

References 25 publications

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“…( Table 4 , Table 5 and Table 6 ). The increased toxicity of the formulations in the presence of formulating agents (e.g., POEA) has already been proven in several studies [ 15 , 77 , 120 , 121 ]. Based on our results, POEA proved to be more toxic than APG ( p < 0.001) ( Table 4 and Table 6 ).…”

Section: Discussionmentioning

confidence: 99%

“…For example, the determined 72 h EC 50 values are in the range of 24.7–166 mg/L [ 15 , 20 , 73 ] for P. subcapitata , while for Desmodesmus subspicatus higher values were calculated (72.9–166 mg/L) [ 41 , 52 , 74 , 75 , 76 ] during the ecotoxicological testing on the effects of glyphosate. Moreover, potential adverse effects of glyphosate and GBHs were indicated also on freshwater periphyton [ 77 , 78 , 79 ]. Moreover, the increased toxicity of Roundup was demonstrated on cyanobacterial and green algal species ( M. aeruginosa, Nitella microcarpa var.…”

Section: Introductionmentioning

confidence: 99%

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Hormesis, the Individual and Combined Phytotoxicity of the Components of Glyphosate-Based Formulations on Algal Growth and Photosynthetic Activity

Klátyik,

Takács,

Barócsi

et al. 2024

Toxics

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The occurrence of the market-leading glyphosate active ingredient in surface waters is a globally observed phenomenon. Although co-formulants in pesticide formulations were considered inactive components from the aspects of the required main biological effect of the pesticide, several studies have proven the high individual toxicity of formulating agents, as well as the enhanced combined toxicity of the active ingredients and other components. Since the majority of active ingredients are present in the form of chemical mixtures in our environment, the possible combined toxicity between active ingredients and co-formulants is particularly important. To assess the individual and combined phytotoxicity of the components, glyphosate was tested in the form of pure active ingredient (glyphosate isopropylammonium salt) and herbicide formulations (Roundup Classic and Medallon Premium) formulated with a mixture of polyethoxylated tallow amines (POEA) or alkyl polyglucosides (APG), respectively. The order of acute toxicity was as follows for Roundup Classic: glyphosate < herbicide formulation < POEA. However, the following order was demonstrated for Medallon Premium: herbicide formulation < glyphosate < APG. Increased photosynthetic activity was detected after the exposure to the formulation (1.5–5.8 mg glyphosate/L and 0.5–2.2 mg POEA/L) and its components individually (glyphosate: 13–27.2 mg/L, POEA: 0.6–4.8 mg/L), which indicates hormetic effects. However, decreased photosynthetic activity was detected at higher concentrations of POEA (19.2 mg/L) and Roundup Classic (11.6–50.6 mg glyphosate/L). Differences were demonstrated in the sensitivity of the selected algae species and, in addition to the individual and combined toxicity of the components presented in the glyphosate-based herbicides. Both of the observed inhibitory and stimulating effects can adversely affect the aquatic ecosystems and water quality of surface waters.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hormesis, the Individual and Combined Phytotoxicity of the Components of Glyphosate-Based Formulations on Algal Growth and Photosynthetic Activity

Klátyik,

Takács,

Barócsi

et al. 2024

Toxics

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“…Toxicological tests on microalgae (most commonly planktonic marine diatoms) are conducted widely throughout the world [1,10,33,34]. Many of these tests are conducted on single strains, which only provide information regarding so-called potential niches.…”

Section: Discussionmentioning

confidence: 99%

“…It easily reaches water bodies through surface runoff waters and this affects photosynthetic microorganism communities that are often the foundation of the functioning of aquatic ecosystems. Hence, monitoring the reactions of microorganisms to glyphosate is an important element of environmental management [1]. Since relatively little is known about the impact glyphosate has on communities of aquatic organisms, and especially those of marine organisms, the aim of this study was to assess the impact of glyphosate in the popular herbicide Roundup ® on the condition of the natural microphytobenthos in the Baltic Sea.…”

Section: Introductionmentioning

confidence: 99%

Ecotoxicological Studies on the Effect of Roundup® (Glyphosate Formulation) on Marine Benthic Microalgae

Sylwestrzak

Zgrundo

Pniewski

2021

IJERPH

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Glyphosate is a very effective herbicide and the main active ingredient in Roundup®—the most extensively used herbicide in the world. Since glyphosate is highly water soluble it reaches water bodies easily in surface water runoff. This prompted us to undertake an experiment to evaluate the effects of glyphosate in Roundup® on natural communities of marine microphytobenthos. Microphytobenthos communities were obtained from the environment, and after transporting them to the laboratory and acclimatizing them, they were tested under controlled conditions. Changes in microphytobenthos composition and structure and the deteriorating condition of the cells of community-forming organisms (assessed by analyzing changes in chloroplast shape) were used to assess the impact of Roundup® on endpoints. The tests indicated that microphytobenthic communities were relatively resistant to herbicide. The species richness of the communities probably enabled them to rebuild effectively. Sensitive species were replaced by those more tolerant of glyphosate. Only at the highest glyphosate concentration (8.5 g·dm−3) tested was a strong negative effect noted that limited community abundance and eliminated some of the organisms. The dominant diatoms in the communities were replaced by intensively developing cyanobacteria, which ultimately comprised nearly 60% of all the cells observed in the communities.

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“…For example, a study showed some adverse effects on two species of Annelids at concentrations that greatly exceed the recommended field application rate of glyphosate (García-Torres et al, 2014). Besides, high concentrations of glyphosate (order of mg L -1 ) decreased the abundance of Chlorophytes in the periphyton (Gonzalez et al, 2019).…”

Section: Initial Community Structure and Composition Of Biofilmsmentioning

confidence: 99%

Interaction between glyphosate and dissolved phosphorus on bacterial and eukaryotic communities from river biofilms

Carles

Artigas

2020

Science of The Total Environment

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Since the capacity of river biofilms to degrade glyphosate has been proven to increase when the availability of dissolved phosphorus (P) in water decreases, the present study investigates the diversity responses of bacterial and eukaryotic microbial communities from biofilms in a search for glyphosate-degrader candidates. Glyphosate and P interactions were observed for eukaryotic communities, the highest community richness and diversity being preserved at low concentrations of glyphosate and P. This trend marked by glyphosate was also observed in the structure of eukaryotic communities. Therefore, phosphorus and glyphosate had a synergistic effect in decreasing the richness and diversity of eukaryotes species in biofilms. However, species richness and diversity in bacterial communities were not affected by glyphosate, though shifts in the structure of these communities were concomitant with the degradation of the herbicide. Bacterial communities capable of using glyphosate as P source were characterized by increases in the relative abundance of certain Bacteroidetes, Chloroflexi, Cyanobacteria, Planctomycetes and alpha-Proteobacteria members. Glyphosate-degrader candidates found in natural river biofilms can be further isolated for better understanding of glyphosate degradation pathways, and used as bioremediation strategies in heavily contaminated sites.

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Freshwater periphyton response to technical-grade and two commercial formulations of glyphosate

Cited by 9 publications

References 25 publications

Hormesis, the Individual and Combined Phytotoxicity of the Components of Glyphosate-Based Formulations on Algal Growth and Photosynthetic Activity

Hormesis, the Individual and Combined Phytotoxicity of the Components of Glyphosate-Based Formulations on Algal Growth and Photosynthetic Activity

Ecotoxicological Studies on the Effect of Roundup® (Glyphosate Formulation) on Marine Benthic Microalgae

Interaction between glyphosate and dissolved phosphorus on bacterial and eukaryotic communities from river biofilms

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