Effects of low concentrations of the phenylurea herbicide diuron on biofilm algae and bacteria

Ricart, Marta; Barceló, Damià; Geiszinger, Anita; Guasch, Helena; Alda, Miren López de; Romaní, Anna M.; Vidal, Gemma; Villagrasa, Marta; Sabater, Sergi

doi:10.1016/j.chemosphere.2009.06.017

Cited by 132 publications

(71 citation statements)

References 40 publications

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“…The toxic effects of diuron on the photosynthetic apparatus of different algal species have been examined by many authors [10, 24-27, 89, 93, 115, 117] and among other ecotoxicological data the values of IC 10 = 0.74 μL L −1 (based on PSII quantum yield) for Phaeodactylum tricornutum [27] and IC 50 = 7 μL L −1 (based on Φ m , 1.5 h) for S. capricornutum [10] are included. Natural periphyton studies have reported an induced increase in Chl-α content after long-term (29 days) exposure to low concentrations (1μg L −1 ) of diuron [122]. This observation is in agreement with other previous studies of Tlili et al, who found that periphyton chronically exposed to 1 μg L −1 of diuron showed higher Chl-α pigments and carbon incorporation rates than control periphyton from day 21 to day 32 of their microcosm experiment [123].…”

Section: E Huxleyi Fucus Vesiculosus Enteromorpha Intestinalis Ulsupporting

confidence: 83%

“…Depending on the nature, concentration, frequency, and duration of toxicants exposure, their impacts on biological communities can prove highly variable [89]. Until nowadays, many experimental studies of aquatic communities of microorganisms have been done using water-column phytoplanktonic species, but only a few have attempted to assess the effect of environmentally realistic pollution exposure scenarios on microbenthic periphyton [89,122,123,176]. The distribution characteristics of chemical toxicants between water phase and sediment are of major importance in the evaluation of their fate and ecotoxicological effects into environmental compartments, especially for organic hydrophobic pollutants.…”

Section: Conclusion and Trendsmentioning

confidence: 99%

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Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

Petsas¹,

Vagi²

2017

Chlorophyll

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Algal studies remain necessary for risk assessment and their utility in ecotoxicology is the evaluation of lethal and sub-lethal toxic effects of potential toxicants on inhabitants of several ecosystems. Effects on algal photosynthetic apparatus caused by various chemical species have been extensively studied. The present chapter summarizes the published data concerning the toxicity of various organic and inorganic pollutants such as oils, pesticides, antifoulants and metals on photosynthesis of aquatic primary producers. Biochemical mode of action resulting in the disruption of photosynthesis depends on the chemical's nature and the characteristics of the exposed microorganism. Observed differences in response and sensitivity by different species to the same toxicant were attributed to several algal characteristics including photosynthetic capacity, pigment type, cellular lipid and protein content, and cell size. Single species bioassays either for one chemical alone or in mixture have been well reported and tolerance of both marine and freshwater water-column phytoplaktonic species has been examined. Adequate published information on multispecies tests (communities) in laboratory and field studies exists. However, risk assessment on photosynthesis of microbenthic periphyton is inadequate, though it is essential especially for hydrophobic organic molecules. Further studies are required to evaluate the adverse effects of metabolites on aquatic microalgae.

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Section: E Huxleyi Fucus Vesiculosus Enteromorpha Intestinalis Ulsupporting

confidence: 83%

Section: Conclusion and Trendsmentioning

confidence: 99%

Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

Petsas¹,

Vagi²

2017

Chlorophyll

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“…15,19 There was a factor of 4 between the lowest and the highest values whereas a factor 7 was found for a group of eight marine diatoms. 14 Much higher values were obtained with natural periphyton from the Morcille River, 19 whose phototrophic community was composed of diatoms at 80%.…”

Section: Discussionmentioning

confidence: 99%

“…Higher chla concentrations compared to controls at low diuron doses had already been observed in experimental channels with biofilm. 15 This 'greening effect' may result from an adaptive increase of pigment production in microalgal cells to compensate for the reduction in photosynthetic efficiency caused by the herbicide. From our results, the extent of this adaptation can be estimated from the height and the broadness of the peak of chla f (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless the complex biotic interactions in diatom communities make the isolation of the toxic effect on individual species difficult, especially at low contamination levels. 3,15 In order to use periphytic diatoms as bioindicators of water contamination by pesticides, variations in the sensitivity of diatom species have to be clearly demonstrated and these variations must lead to the classification of diatoms into groups of tolerance defined on a taxonomic (species or genus level, like current diatom indices) or an ecological basis (life forms) as recently proposed by Rimet and Bouchez. 3 As a contribution to this objective, the present study independently compared the sensitivity to diuron of a few common diatom species isolated from the same river.…”

Section: Environmental Impactmentioning

confidence: 99%

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Variations of periphytic diatom sensitivity to the herbicide diuron and relation to species distribution in a contamination gradient: implications for biomonitoring

Roubeix¹,

Mazzella²,

Schouler³

et al. 2011

J. Environ. Monit.

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Diatoms are commonly used as bioindicators of trophic and saprobic pollution in rivers. However, more knowledge is needed concerning their sensitivity to toxicants such as agricultural herbicides. In this study, seven species of periphytic diatoms were isolated from the Morcille River (Beaujolais area, France) which presents a streamward contamination gradient by pesticides and particularly diuron. The sensitivity of these species to diuron was assessed through ecotoxicological tests based on short-term growth inhibition of monospecific cultures. After application of an appropriate toxicological model, EC50 were determined and the species were ranked according to their tolerance. EC50 values ranged from 4.5 to 19 μg L−1. Finally, the results were related to field periphyton samples from an upstream and a downstream site in order to check if variations in specific relative abundance between sites are consistent with differences in tolerance to diuron. Species distribution between sites was only partially in accordance with toxicological results suggesting that other factors (toxic or trophic) have an important influence on diatom communities in the river. Nevertheless, diatoms showed their potential to indicate water contamination by pesticides and toxic indices could be developed in complement to existing trophic indices

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Assessment and characterization of antifungal and antialgal performances for biocide‐enhanced linear low‐density polyethylene

Gitchaiwat

Kositchaiyong

Sombatsompop

et al. 2012

J of Applied Polymer Sci

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In this work, four biocides were used for the purpose of growth inhibition of fungi and algae in linear low-density polyethylene (LLDPE) specimens. Benzimidazol-2-yl-carbamicacid methyl ester [carbendazim (CB)], 5-chloro-2-(2,4-dichlorophenoxy)phenol [triclosan (TS)], and 3-iodo-2-propynyl N-butylcarbamate [iodopropynyl butylcarbamate (IPBC)] were used as antifungal agents, and 2-methylthio-4-ethylamino-6-tert-butylamino-triazin-1,3,5 [terbutryn (TT)] was used as an antialgal agent. Antifungal performance was evaluated by disk diffusion and dry weight techniques, and antialgal activities were carried out by disk diffusion and chlorophyll A methods. Aspergillus niger TISTR 3245 and Chlorella vulgaris TISTR 8580 were used as the testing fungus and alga, respectively. The experimental results suggested that the wettabilities of LLDPE specimens changed with the incorporation of CB, TS, IPBC, and TT biocides without significant changes in chemical structures and mechanical properties of the LLDPE. IPBC with the recommended content of 10,000 ppm was found to give the most satisfactory growth inhibition of A. niger. Antifungal performance evaluations were dependent on the testing methods used, whereas those for antialgal activity were not. The optimum concentration of TT agent for effective killing of C. vulgaris was 750 ppm; this loading could be reduced from 750 to 250 ppm by the addition of either TS or IPBC agent. TS and IPBC could be used as antialgal promoters in the LLDPE specimens.

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Effects of low concentrations of the phenylurea herbicide diuron on biofilm algae and bacteria

Cited by 132 publications

References 40 publications

Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

Variations of periphytic diatom sensitivity to the herbicide diuron and relation to species distribution in a contamination gradient: implications for biomonitoring

Assessment and characterization of antifungal and antialgal performances for biocide‐enhanced linear low‐density polyethylene

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