Effects of Atrazine and Nicosulfuron on Phytoplankton in Systems of Increasing Complexity

Seguin, C. Leboulanger F.

doi:10.1007/s002440010164

Cited by 61 publications

(3 citation statements)

References 48 publications

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“…Another study found the triazine atrazine to be more toxic to the chlorophytes than to diatoms (Seguin et al, 2001). From the data available in literature, it is still unclear whether diatoms are more sensitive to triazine than other microalgae, since this sensitivity can vary depending on the herbicide (Suresh Kumar et al, 2014) and the diatom species (Larras et al, 2014).…”

Section: Herbicide Toxicity Towards the Two Wild Strainsmentioning

confidence: 98%

Microalgal sensitivity varies between a diuron-resistant strain and two wild strains when exposed to diuron and irgarol, alone and in mixtures

Dupraz¹,

Coquillé²,

Ménard³

et al. 2016

Chemosphere

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A wild strain of Chaetoceros calcitrans and wild and diuron-resistant strains of Tetraselmis suecica, were exposed to the PSII inhibitor herbicides diuron and irgarol, individually and in mixtures. The effects of three concentrations of diuron and irgarol and four binary mixtures were evaluated on doubling time, relative reactive oxygen species and lipid content by flow cytometry, and on photosynthetic efficiency by pulse amplitude modulated fluorescence. In both wild strains, significant effects were observed for each molecule at the highest concentration tested: at irgarol 0.5 μg L(-1), C. calcitrans was shown to be more sensitive than T. suecica (+52% and +19% in doubling time, respectively), whereas at diuron 5 μg L(-1), T. suecica was more affected (+125% in doubling time) than C. calcitrans (+21%). Overall, irgarol had a higher toxicity at a lower concentration than diuron (no effect at diuron 0.5 μg L(-1)) for both wild strains. The strongest mixture (irgarol 0.5 μg L(-1) + diuron 5 μg L(-1)) increased doubling time by 356% for T. suecica, thus showing amplified effects when the two compounds were mixed. Sequencing of the diuron-resistant strain demonstrated a single mutation in the psbA gene coding sequence. Although resistance of this strain to diuron was confirmed with no effect at the highest diuron concentration, no resistance to irgarol was shown. In addition, the mutant strain exposed to the strongest mixture showed a 3.5-fold increase in doubling time compared with irgarol alone, thereby supporting the hypothesis of a biochemical interaction between these two compounds.

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Section: Herbicide Toxicity Towards the Two Wild Strainsmentioning

confidence: 98%

Microalgal sensitivity varies between a diuron-resistant strain and two wild strains when exposed to diuron and irgarol, alone and in mixtures

Dupraz¹,

Coquillé²,

Ménard³

et al. 2016

Chemosphere

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“…Such systems give a view of the whole community, including populations that are hard to maintain; they can thus provide a wider survey of organism sensitivity for toxicants (Yasuno et al 1993). Leboulanger et al (2001) and Seguin et al (2001) pointed out the need for reliable toxicity data from such microcosm systems.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of three analysis methods (TTGE, flow cytometry and HPLC) for xenobiotic impact assessment on phytoplankton communities

Stachowski-Haberkorn

Quiniou²,

Beker³

et al. 2008

Ecotoxicology

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The impacts of the fungicide Opus (epoxiconazole) on marine phytoplankton communities were assessed in a 12-day field experiment using in situ microcosms maintained underwater at 6 m depth. Three community analysis methods were compared for their sensitivity threshold in fungicide impact detection. When phytoplankton communities were exposed to 1 microg l(-1) of epoxiconazole, no effects could be demonstrated using TTGE (Temporal Temperature Gradient gel Electrophoresis), flow cytometry or HPLC. When exposed to 10 microg l(-1), TTGE fingerprints from PCR amplified 18S rDNA of communities exhibited significant differences compared with controls (ANOSIM, P = 0.028). Neither flow cytometry counts, nor HPLC pigment profiles allowed to show significant differences in microcosms exposed to 10 microg l(-1) of epoxiconazole. When exposed to 100 microg l(-1), all three methods allowed to detect significant differences in treated microcosms, as compared to controls. The TTGE analysis appears in this study as the most sensitive method for fungicide impact assessment on eukaryote microbial communities.

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“…Environmental concentrations of the sulfonylurea herbicides in these surface waters were, in all studies, less than 1 µg L −1 . However, concentrations of sulfonylurea herbicides in the range of 0.4 to 2 µg L −1 have been shown to affect some algae species (Nyström et al, 1999;Seguin et al, 2001;Couderchet and Vernet, 2003;Vulliet et al, 2004) as well as the macrophyte Lemna minor (Fairchild et al, 1999;Vulliet et al, 2004). Chlorsulfuron, metsulfuron-methyl (Nyström et al, 1999;Fairchild et al, 1999), and triasulfuron (Vulliet et al, 2004) affected both algae and Lemna minor, whereas flazasulfuron (Couderchet and Vernet, 2003), nicosulfuron (Seguin et al, 2001), bensulfuron-methyl, and imazosulfuron (Ishihara, 2009) were shown to affect algae.…”

Section: Spring To Fallmentioning

confidence: 99%

Persistence of the Sulfonylurea Herbicides Sulfosulfuron, Rimsulfuron, and Nicosulfuron in Farm Dugouts (Ponds)

Cessna

Donald

Bailey³

et al. 2015

J. Environ. Qual.

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Sulfonylurea herbicides are applied at relatively low rates (3-40 g ha) to control weeds in a variety of crops grown in the prairie pothole region of south-central Canada. Because of their high phytotoxicity and the likelihood of their transport in surface runoff, there is concern about impacts of sulfonylurea herbicides to wetland ecosystems embedded in agricultural landscapes. In a previous study, dissipation half-lives (DT values) were determined for three sulfonylurea herbicides (thifensulfuron-methyl, ethametsulfuron-methyl, and metsulfuron-methyl), each possessing a hydrolyzable methyl ester linkage. In the current study, persistence of three sulfonylurea herbicides without a methyl ester linkage was determined in prairie farm dugouts (ponds). The dugouts were fortified with environmentally relevant concentrations (3.3-6.5 μg L) of either sulfosulfuron, rimsulfuron, or nicosulfuron. The order of persistence of these herbicides in dugout water from May and June to November and December was nicosulfuron > sulfosulfuron > rimsulfuron, with DT values of 75, 44, and 10 d, respectively. The lack of a methyl ester linkage in these herbicides did not significantly affect their overall persistence relative to those with the ester linkage. In all three dugouts, the decrease in herbicide mass in the water column from water loss via hydrological discharge to groundwater was minimal. The relatively long persistence of these herbicides in the water column of the dugouts reflects the stability of the sulfonylurea linkage to hydrolysis in weakly alkaline waters and indicates not only that microbial and photolytic degradation were low but also that there was little partitioning into sediments.

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Effects of Atrazine and Nicosulfuron on Phytoplankton in Systems of Increasing Complexity

Cited by 61 publications

References 48 publications

Microalgal sensitivity varies between a diuron-resistant strain and two wild strains when exposed to diuron and irgarol, alone and in mixtures

Microalgal sensitivity varies between a diuron-resistant strain and two wild strains when exposed to diuron and irgarol, alone and in mixtures

Comparative study of three analysis methods (TTGE, flow cytometry and HPLC) for xenobiotic impact assessment on phytoplankton communities

Persistence of the Sulfonylurea Herbicides Sulfosulfuron, Rimsulfuron, and Nicosulfuron in Farm Dugouts (Ponds)

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