Sensitivity of freshwater periphytic diatoms to agricultural herbicides

Debenest, Timothée; Pinelli, Éric; Coste, Michel; Silvestre, Jérôme; Mazzella, Nicolás; Madigou, Céline; Delmas, François

doi:10.1016/j.aquatox.2009.02.014

Cited by 95 publications

(68 citation statements)

References 44 publications

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“…This suggests that fucoxanthin-containing cells may have contributed to other phototrophic communities, which was furthermore confirmed in the Versailles soil, where specific HPLC dosages of isolated bryophyta and cyanobacteria confirmed the presence of small quantites of fucoxanthin (data not shown). Effects of formulated S-metolachlor on soil diatoms were coherent with already published studies (Debenest et al 2009;Roubeix et al 2011) which have highlighted the deleterious effect of low doses of metolachlor (racemic form of S-metolachlor) on freshwater diatoms, by temporally stopping their development.…”

Section: Microbial Phototrophic Colonizationsupporting

confidence: 59%

Soil surface colonization by phototrophic indigenous organisms, in two contrasted soils treated by formulated maize herbicide mixtures

et al. 2014

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Soil phototrophic microorganisms, contributors to soil health and food webs, share their particular metabolism with plants. Current agricultural practices employ mixtures of pesticides to ensure the crops yields and can potentially impair these non-target organisms. However despite this environmental reality, studies dealing the susceptibility of phototrophic microorganisms to pesticide mixtures are scarce. We designed a 3 months microcosm study to assess the ecotoxicity of realistic herbicide mixtures of formulated S-metolachlor (Dual Gold Safeneur(®)), mesotrione (Callisto(®)) and nicosulfuron (Milagro(®)) on phototrophic communities of two soils (Limagne vertisol and Versailles luvisol). The soils presented different colonizing communities, with diatoms and chlorophyceae dominating communities in Limagne soil and cyanobacteria and bryophyta communities in Versailles soil. The results highlighted the strong impairment of Dual Gold Safeneur(®) treated microcosms on the biomass and the composition of both soil phototrophic communities, with no resilience after a delay of 3 months. This study also excluded any significant mixture effect on these organisms for Callisto(®) and Milagro(®) herbicides. We strongly recommend carrying on extensive soil studies on S-metolachlor and its commercial formulations, in order to reconsider its use from an ecotoxicological point of view.

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Section: Microbial Phototrophic Colonizationsupporting

confidence: 59%

Soil surface colonization by phototrophic indigenous organisms, in two contrasted soils treated by formulated maize herbicide mixtures

et al. 2014

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“…For M. varians, however, general knowledge of its sensitivity to pollution (eutrophication and saproby) is not consistent with the findings of certain herbicide studies. Indeed M. varians is generally recorded in clean rivers but appears to accommodate well to high herbicide concentrations (Spawn et al, 1997;Debenest et al, 2009).…”

Section: Species Sensitive/tolerant To Metolachlormentioning

confidence: 99%

Impact of the herbicide metolachlor on river periphytic diatoms: Experimental comparison of descriptors at different biological organization levels

Roubeix

Mazzella

Méchin

et al. 2011

Ann. Limnol. - Int. J. Lim.

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-A microcosm experiment was carried out in order to test the effect of the herbicide metolachlor on river periphytic diatoms and to find potential diatom bioindicators of contamination. Effects were investigated at different biological organization levels (biofilm, diatom community, population and individual levels). The colonization of glass substrates by natural biofilm in artificial streams did not vary quantitatively between control and contaminated conditions (5 and 30 mg.L x1 ). However, non-parametric multivariate analysis of variance revealed a significant difference between contaminated and control diatom communities with regard to species composition. The difference was due to the greater development of probably tolerant species in the presence of the herbicide (e.g., Planothidium frequentissimum, Planothidium lanceolatum, Amphora montana, Surirella brebissonii and Nitzschia gracilis). An increase in the occurrence of abnormal forms was observed in relation to metolachlor concentration. In particular, up to 8% of the frustules of the species Surirella angusta exhibited prominent deformities. Monospecific acute toxicity tests were then performed on two species to estimate toxicity parameters based on growth inhibition. These tests also confirmed the teratogenic effect of the herbicide on S. angusta. This study shows that low concentrations of metolachlor in natural streams may significantly alter diatom community structure and that abnormal diatom forms should be taken into account in water contamination assessment.

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“…In order to evaluate the direct impact of herbicides on microbial communities, Blank et al (1988) have developed a very interesting concept, known as PICT (Pollution Induced Community Tolerance). This concept is based on the fact that communities contain species with differing sensitivities to various chemicals (see for example for diatoms, Debenest et al, 2009). After exposure to these pollutants for long enough, sensitive species or strains will be eliminated and tolerant ones will be selected, and the resulting restructured community will become more tolerant.…”

Section: Field Studies To Evaluate the Impact Of Contaminants On Micrmentioning

confidence: 99%

Herbicide Contamination of Freshwater Ecosystems: Impact on Microbial Communities

Villeneuve¹,

Larroudé²,

Humbert³

2011

Pesticides - Formulations, Effects, Fate

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Sensitivity of freshwater periphytic diatoms to agricultural herbicides

Cited by 95 publications

References 44 publications

Soil surface colonization by phototrophic indigenous organisms, in two contrasted soils treated by formulated maize herbicide mixtures

Soil surface colonization by phototrophic indigenous organisms, in two contrasted soils treated by formulated maize herbicide mixtures

Impact of the herbicide metolachlor on river periphytic diatoms: Experimental comparison of descriptors at different biological organization levels

Herbicide Contamination of Freshwater Ecosystems: Impact on Microbial Communities

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