Primary and complex stressors in polluted mediterranean rivers: Pesticide effects on biological communities

Ricart, Marta; Guasch, Helena; Barceló, Damià; Brix, Rikke; Conceição, Maria Hosana; Geiszinger, Anita; Alda, Miren López de; López-Doval, Júlio C.; Muñoz, Isabel; Postigo, Cristina; Romaní, Anna M.; Villagrasa, Marta; Sabater, Sergi

doi:10.1016/j.jhydrol.2009.08.014

Cited by 138 publications

(62 citation statements)

References 51 publications

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“…However, in natural samples, lethal effects of TCS were observed, by using the bioluminescence assay of Vibrio fisheri, at much lower concentrations of environmental relevance. For instance, DeLorenzo et al [25] reported an EC 50 of 53 mg l 21 for estuarine samples and Farré et al [26] determined an EC 50 of 280 mg l 21 in waste-waters while Ricart et al [27] observed mortality within a river biofilm at only 0.21 mg l 21 TCS. The same is true for the acute toxic effects of TCS exposure on cooccurring non-target components, especially for microalgae [22,27,28] and for higher organisms such as shrimps [29].…”

Section: Triclosan -More Than Just Concentrationmentioning

confidence: 99%

“…It has been indicated that TCS acts as a bacteriostatic agent at low concentrations, inhibiting bacterial growth and reproduction [16,23], but becomes bactericidal at higher concentrations causing permanent damage to the bacterial membrane [24]. For instance, Ricart et al [27] reported on steeply decreasing live/dead ratio of bacteria with increasing TCS concentrations (e.g. 0.7 in control as opposed to 0.3 for 50 -100 mg L -1 ) and environmental relevant concentrations caused increased mortality (No Effect Concentration (NEC) of 0.21 mg L -1 ).…”

Section: The Significant Role Of the Eps Matrix For Binding And The Imentioning

confidence: 99%

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The RNA Processing Enzyme Polynucleotide Phosphorylase Negatively Controls Biofi lm Formation by Repressing Poly-N-Acetylglucosamine (PNAG) Production in Escherichia coli C

Sayen¹

2014

Biofilm Control and Antimicrobial Agents

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The accumulation of the widely-used antibacterial and antifungal compound triclosan (TCS) in freshwaters raises concerns about the impact of this harmful chemical on the biofilms that are the dominant life style of microorganisms in aquatic systems. However, investigations to-date rarely go beyond effects at the cellular, physiological or morphological level. The present paper focuses on bacterial biofilms addressing the possible chemical impairment of their functionality, while also examining their substratum stabilization potential as one example of an important ecosystem service. The development of a bacterial assemblage of natural composition -isolated from sediments of the Eden Estuary (Scotland, UK) -on non-cohesive glass beads (,63 mm) and exposed to a range of triclosan concentrations (control, 2 -100 mg L 21 ) was monitored over time by Magnetic Particle Induction (MagPI). In parallel, bacterial cell numbers, division rate, community composition (DGGE) and EPS (extracellular polymeric substances: carbohydrates and proteins) secretion were determined. While the triclosan exposure did not prevent bacterial settlement, biofilm development was increasingly inhibited by increasing TCS levels. The surface binding capacity (MagPI) of the assemblages was positively correlated to the microbial secreted EPS matrix. The EPS concentrations and composition (quantity and quality) were closely linked to bacterial growth, which was affected by enhanced TCS exposure. Furthermore, TCS induced significant changes in bacterial community composition as well as a significant decrease in bacterial diversity. The impairment of the stabilization potential of bacterial biofilm under even low, environmentally relevant TCS levels is of concern since the resistance of sediments to erosive forces has large implications for the dynamics of sediments and associated pollutant dispersal. In addition, the surface adhesive capacity of the biofilm acts as a sensitive measure of ecosystem effects.

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Section: Triclosan -More Than Just Concentrationmentioning

confidence: 99%

Section: The Significant Role Of the Eps Matrix For Binding And The Imentioning

confidence: 99%

The RNA Processing Enzyme Polynucleotide Phosphorylase Negatively Controls Biofi lm Formation by Repressing Poly-N-Acetylglucosamine (PNAG) Production in Escherichia coli C

Sayen¹

2014

Biofilm Control and Antimicrobial Agents

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“…Although extensive studies to evaluate the potential carcinogenicity of bentazone indicated the absence of significant tumor increase when chronic and high doses were administered to rats and mice, the concern for human health is still very high. Its low adsorption and high water solubility make bentazone one of the most commonly detected pollutants in the surface waters and groundwaters of Portugal and other European countries [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Methods that have been reported for the quantification of bentazone in environmental samples include gas chromatography and high performance liquid chromatography (HPLC) [9][10][11][12][13]. Although these methods have been widely applied due to their high sensitivity, selectivity and ability to minimize interferences, these merits are overshadowed by extensive and time-consuming sample preparation, making them unsuitable for routine environmental monitoring.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Determination of the Herbicide Bentazone Using a Carbon Nanotube β‐Cyclodextrin Modified Electrode

et al. 2013

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An electrochemical sensor has been developed for the determination of the herbicide bentazone, based on a GC electrode modified by a combination of multiwalled carbon nanotubes (MWCNT) with b-cyclodextrin (b-CD) incorporated in a polyaniline film. The results indicate that the b-CD/MWCNT modified GC electrode exhibits efficient electrocatalytic oxidation of bentazone with high sensitivity and stability. A cyclic voltammetric method to determine bentazone in phosphate buffer solution at pH 6.0, was developed, without any previous extraction, clean-up, or derivatization steps, in the range of 10-80 mmol L À1 , with a detection limit of 1.6 mmol L À1 in water. The results were compared with those obtained by an established HPLC technique. No statistically significant differences being found between both methods.

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“…qP는 광계II의 초기 전자 수용체인 QA의 redox상태에 의해 결정되며 전자전달에 사용되는 에너지를 의미한다 (Horton et al, 1999). Ricart et al, 2010;Bilger and Björkman, 1990). …”

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Assessment of Heavy Metal Effects on the Freshwater Microalga, Chlorella vulgaris, by Chlorophyll Fluorescence Analysis

Oh¹,

Koh

2015

Journal of Environmental Science International

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The response of the freshwater microalga, Chlorella vulgaris, to heavy metal stress was examined based on chlorophyll fluorescence analysis to assess the toxic effects of heavy metals in freshwater ecosystems. When toxic effects were analyzed using regular chlorophyll fluorescence analysis, photosystem II activity(Fv/Fm) decreased significantly when exposed to Cu , and Cd 2+. These results suggest that Fv/Fm, as well as Φ′PSII, RFd, Fo, and NPQ could be used to assess the effects of heavy metal ions in freshwater ecosystems. However, because many types of heavy metal ions and toxic compounds co-occur under natural conditions, it is difficult to assess heavy metal toxicity in freshwater ecosystems. When Chlorella was exposed to heavy metal ions for 12 or 24h, Fv/Fm and maximal fluorescence yield(Fm) changed in response to Hg 2+ and Cu 2+ based on image analysis. However, assessing quantitatively the toxic effects of several heavy metal ions is challenging.

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Primary and complex stressors in polluted mediterranean rivers: Pesticide effects on biological communities

Cited by 138 publications

References 51 publications

The RNA Processing Enzyme Polynucleotide Phosphorylase Negatively Controls Biofi lm Formation by Repressing Poly-N-Acetylglucosamine (PNAG) Production in Escherichia coli C

The RNA Processing Enzyme Polynucleotide Phosphorylase Negatively Controls Biofi lm Formation by Repressing Poly-N-Acetylglucosamine (PNAG) Production in Escherichia coli C

Electrochemical Determination of the Herbicide Bentazone Using a Carbon Nanotube β‐Cyclodextrin Modified Electrode

Assessment of Heavy Metal Effects on the Freshwater Microalga, Chlorella vulgaris, by Chlorophyll Fluorescence Analysis

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