Multistressor negative effects on an experimental phytoplankton community. The case of glyphosate and one toxigenic cyanobacterium on Chlorophycean microalgae

Hernández-García, Claudia Ivette; Martínez‐Jerónimo, Fernando

doi:10.1016/j.scitotenv.2020.137186

Cited by 25 publications

(19 citation statements)

References 73 publications

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“…It has been shown that herbicides may promote the growth of cyanobacteria and restrain other algal taxa. ,, At the same time, the degradation of glyphosate-based herbicides (GBH) increases anthropogenic phosphorus input to water ecosystems, which supports the growth of cyanobacteria . However, researchers also declare that GBH probably disrupt the growth of both microalgae and cyanobacteria by damaging cell membrane integrity. ,, In the present study, glyphosate addition alone did not obviously affect the abundance or biomass of total phytoplankton or Microcystis (Figures – and Table S3), supporting findings by Gomes and Juneau . The reason might be that the dose (10 μg/L) used in our experiment was low.…”

Section: Resultsmentioning

confidence: 49%

“…It has been shown that herbicides may promote the growth of cyanobacteria and restrain other algal taxa. 84,94,95 At the same time, the degradation of glyphosate-based herbicides (GBH) increases anthropogenic phosphorus input to water ecosystems, 96 which supports the growth of cyanobacteria. 97 However, researchers also declare that GBH probably disrupt the growth of both microalgae and cyanobacteria by damaging cell membrane integrity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…99 The reason might be that the dose (10 μg/L) used in our experiment was low. Hernańdez-Garci ́a and Marti ́nez-Jerońimo 94 reported that the inhibitory concentrations (IC 50 ) of phytoplankton were specific to species and were generally greater than 1.0 mg/L.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Chemodiversity of Cyanobacterial Toxins Driven by Future Scenarios of Climate Warming and Eutrophication

Yang

Wang

Yan

et al. 2023

Environ. Sci. Technol.

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Climate change and eutrophication are two environmental threats that can alter the structure of freshwater ecosystems and their service functions, but we know little about how ecosystem structure and function will evolve in future scenarios of climate warming. Therefore, we created different experimental climate scenarios, including present-day conditions, a 3.0 °C increase in mean temperature, and a "heatwaves" scenario (i.e., an increase in temperature variability) to assess the effects of climate change on phytoplankton communities under simultaneous stress from eutrophication and herbicides. We show that the effects of climate warming, particularly heatwaves, are associated with elevated cyanobacterial abundances and toxin production, driven by a change from mainly nontoxic to toxic Microcystis spp. The reason for higher cyanobacterial toxin concentrations is likely an increase in abundances because under the dual pressures of climate warming and eutrophication individual Microcystis toxin-producing ability decreased. Eutrophication and higher temperatures significantly increased the biomass of Microcystis, leading to an increase in the cyanobacterial toxin concentrations. In contrast, warming alone did not produce higher cyanobacterial abundances or cyanobacterial toxin concentrations likely due to the depletion of the available nutrient pool. Similarly, the herbicide glyphosate alone did not affect abundances of any phytoplankton taxa. In the case of nutrient enrichment, cyanobacterial toxin concentrations were much higher than under warming alone due to a strong boost in biomass of potential cyanobacterial toxin producers. From a broader perspective our study shows that in a future warmer climate, nutrient loading has to be reduced if toxic cyanobacterial dominance is to be controlled.

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Section: Resultsmentioning

confidence: 49%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Chemodiversity of Cyanobacterial Toxins Driven by Future Scenarios of Climate Warming and Eutrophication

Yang

Wang

Yan

et al. 2023

Environ. Sci. Technol.

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“…This is attributed to the phosphorus content in glyphosate, which is essential to microalgae growth (20). Several other studies also suggested that Chlorella species, including C. pyrenoidosa, C. saccharophila, C. sorokiniana and C. vulgaris are sensitive to glyphosate depending on its concentration and exposure time, which are critical parameters to determine the damage to the balance of the aquatic environment (31,37,42,48,58).…”

Section: Growth Inhibition Test To Assess the Glyphosate Toxicitymentioning

confidence: 99%

“…Specifically, glyphosate interferes with 5-enol-pyruvyl-shikimate-3-phosphate synthase (EPSPS), which block enzymes and prevents the production of aromatic amino acids, including phenylalanine, tyrosine and tryptophan in plants and microorganisms, through the shikimate pathway (32)(33)(34). Previous studies have been demonstrated that toxicity differences to glyphosate exposure in Chlorella microalgae, including C. kessleri (35,36), C. pyrenoidosa (37)(38)(39)(40)(41), C. saccharophila (42), C. sorokiniana (43) and C. vulgaris (20,42,(44)(45)(46)(47)(48)(49). While the toxicity of Chlorella microalgae can be evaluated based on their ubiquity and short life cycle (50), there are no reports on the half-maximal inhibition in response to glyphosate exposure at 24 hr acute toxicity.…”

Section: Introductionmentioning

confidence: 99%

Toxicity response of Chlorella microalgae to glyphosate herbicide exposure based on biomass, pigment contents and photosynthetic efficiency

2021

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The extensive use of glyphosate (N-(phosphonomethyl) glycine) herbicide in agriculture is accompanied by the risk of environmental contamination of aquatic ecosystems. In this study, the effects of glyphosate at different concentrations (50–500 µg ml-1) on three Chlorella species including Chlorella ellipsoidea, Chlorella sorokiniana and Chlorella vulgaris especially in relation to the biomass, pigment contents and photosynthetic efficiency were assessed. After treatment for 24 hr, the acute toxicity results showed that C. vulgaris (IC50 = 449.34 ± 6.20 µg ml-1) was more tolerant to glyphosate than C. ellipsoidea (IC50 = 288.23 ± 23.53 µg ml-1) and C. sorokiniana (IC50 = 174.28 ± 0.50 µg ml-1). After a 72-hr chronic toxicity treatment with glyphosate, glyphosate concentrations decreased to 400–500 µg ml-1 in C. ellipsoidea, 200–300 µg ml-1 in C. sorokiniana and 200–500 µg ml-1 in C. vulgaris respectively. During 24-hr acute toxicity exposure to glyphosate, the pigment contents and maximum quantum efficiency of photosystem II (Fv/Fm) decreased as the concentration of glyphosate increased. Overall, the biomass, pigment contents and photosynthetic efficiency presented a high positive correlation. It is worthwhile to mention that our study provides detailed information on the toxicity and sensitivity of these Chlorella species to glyphosate.

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Lifecycle-dependent toxicity and removal of micropollutants in algal cultures of the green seaweed Ulva (Chlorophyta)

2023

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The green marine seaweed Ulva (Chlorophyta) is widely suggested as a biofilter for cost-effective bioremediation in integrated multitrophic aquaculture and wastewater management. Micropollutants (MPs), including antibiotics, endocrine disruptors, and herbicides, can severely affect humans and the environment. As these compounds may be accumulated or transformed by Ulva, its simultaneous function as an efficient biofilter and as a food and feed source might be affected. Therefore, we investigated the removal of ten MPs often found in wastewater effluents by Ulva and its associated bacteria, and characterized the effects of these MPs on the alga during two crucial lifecycle phases (germination and vegetative growth) using dose dependent tests. We monitored MP detoxification at elevated concentrations in a reductionistic tripartite Ulva mutabilis-Roseovarius-Maribacter model system to reduce interference from the fluctuating algal microbiome. Our results showed that the tripartite community was resistant to the MPs tested, although the gametes were between 2 to 140 times more susceptible based on the half-effective concentrations (EC50) than the growing vegetative alga. The herbicide atrazine and the endocrine disruptor bisphenol A proved the most toxic MPs for germinating gametes. U. mutabilis and its associated bacteria could not eliminate the tested antibiotics and herbicides but efficiently reduced the concentration of endocrine disruptors, including bisphenol A, estradiol, and ethinylestradiol, by over 98% to below the detection limit. We also confirmed that Ulva is not likely to become contaminated under the studied exposure conditions because no biotic processes are used to remove the other MPs, which emphasizes yet another benefit of its use in aquaculture. Compared to green microalgae, U. mutabilis appears to be more resistant to micropollutants.

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Multistressor negative effects on an experimental phytoplankton community. The case of glyphosate and one toxigenic cyanobacterium on Chlorophycean microalgae

Cited by 25 publications

References 73 publications

Chemodiversity of Cyanobacterial Toxins Driven by Future Scenarios of Climate Warming and Eutrophication

Chemodiversity of Cyanobacterial Toxins Driven by Future Scenarios of Climate Warming and Eutrophication

Toxicity response of Chlorella microalgae to glyphosate herbicide exposure based on biomass, pigment contents and photosynthetic efficiency

Lifecycle-dependent toxicity and removal of micropollutants in algal cultures of the green seaweed Ulva (Chlorophyta)

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