Toxicity of the herbicide glyphosate to Chordodes nobilii (Gordiida, Nematomorpha)

Achiorno, Cecilia Luján; Villalobos, Cristina de; Ferrari, Lucrecia

doi:10.1016/j.chemosphere.2008.02.001

Cited by 34 publications

(26 citation statements)

References 23 publications

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“…Most local research took laboratory bioassays into account, using freshwater algae (Asselborn and Zalocar de Domitrovic 1998;Sáenz et al 1997), macrophytes and invertebrates (Achiorno et al 2008). Others assessed glyphosate effects on Lemna gibba using field and laboratory studies (Sobrero et al 2007).…”

Section: Introductionmentioning

confidence: 99%

New evidences of Roundup® (glyphosate formulation) impact on the periphyton community and the water quality of freshwater ecosystems

et al. 2009

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Argentina is the second largest world producer of soybeans (after the USA) and along with the increase in planted surface and production in the country, glyphosate consumption has grown in the same way. We investigated the effects of Roundup (glyphosate formulation) on the periphyton colonization. The experiment was carried out over 42 days in ten outdoor mesocosms of different typology: "clear" waters with aquatic macrophytes and/or metaphyton and "turbid" waters with great occurrence of phytoplankton or suspended inorganic matter. The herbicide was added at 8 mg L(-1) of the active ingredient (glyphosate) in five mesocosms while five were left as controls (without Roundup addition). The estimate of the dissipation rate (k) of glyphosate showed a half-life value of 4.2 days. Total phosphorus significantly increased in treated mesocosms due to Roundup degradation what favored eutrophication process. Roundup produced a clear delay in periphytic colonization in treated mesocosms and values of the periphytic mass variables (dry weight, ash-free dry weight and chlorophyll a) were always higher in control mesocosms. Despite the mortality of algae, mainly diatoms, cyanobacteria was favored in treated mesocosms. It was observed that glyphosate produced a long term shift in the typology of mesocosms, "clear" turning to "turbid", which is consistent with the regional trend in shallow lakes in the Pampa plain of Argentina. Based on our findings it is clear that agricultural practices that involve the use of herbicides such as Roundup affect non-target organisms and the water quality, modifying the structure and functionality of freshwater ecosystems.

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Section: Introductionmentioning

confidence: 99%

New evidences of Roundup® (glyphosate formulation) impact on the periphyton community and the water quality of freshwater ecosystems

et al. 2009

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“…Numerous studies have shown that the formulations and surfactant additives are usually more toxic to test species (Barceló and Hennion, 1995;Giesy et al, 2000). Studies on various organisms such as nematode, juvenile frogs, freshwater crustaceans, microalgae and sturgeons showed that they exhibit significant toxicity to these organisms (Achiorno et al, 2008;Bernal et al, 2009;Ermis and Demir, 2009;Deepananda et al, 2011;Filizadeh and Islami, 2011;Bates and Edwards, 2013;Piola et al, 2013). Removal of glyphosate from soils is best carried out by bioremediation often employing glyphosate-degrading bacteria as the low con-centration of glyphosate in polluted soils make other form of remediation such as chemical and physical more expensive and unpractical.…”

Section: Introductionmentioning

confidence: 99%

ISOLATION AND CHARACTERIZATION OF A MOLYBDENUM-REDUCING AND GLYPHOSATE-DEGRADING Klebsiella oxytoca STRAIN SAW-5 IN SOILS FROM SARAWAK

et al. 2016

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Bioremediation of pollutants including heavy metals and xenobiotics is an economic and environmentally friendly process. A novel molybdenum-reducing bacterium with the ability to utilize the pesticide glyphosate as a carbon source is reported. The characterization works were carried out utilizing bacterial resting cells in a microplate format. The bacterium reduces molybdate to Mo-blue optimally between pH 6.3 and 6.8 and at 34 o C. Glucose was the best electron donor for supporting molybdate reduction followed by lactose, maltose, melibiose, raffinose, d-mannitol, d-xylose, l-rhamnose, l-arabinose, dulcitol, myo-inositol and glycerol in descending order. Other requirements include a phosphate concentration at 5.0 mM and a molybdate concentration between 20 and 30 mM. The molybdenum blue exhibited an absorption spectrum resembling a reduced phosphomolybdate. Molybdenum reduction was inhibited by mercury, silver, cadmium and copper at 2 ppm by 45.5, 26.0, 18.5 and 16.3%, respectively. Biochemical analysis identified the bacterium as Klebsiella oxytoca strain Saw-5. To conclude, the capacity of this bacterium to reduce molybdenum into a less toxic form and to grow on glyphosate is novel and makes the bacterium an important instrument for bioremediation of these pollutants.

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“…Until now, the sensitivity to glyphosate was only evaluated for a Gordiida species, Chordodes nobilii (Achiorno et al 2008). Thus, the present work represents the first report of the effect of an insecticide on a species of the Phylum Nematomorpha.…”

Section: Discussionmentioning

confidence: 93%

“…The experiments were carried out following protocols previously detailed by Achiorno et al (2008). The bioassays with embryos and larvae were performed at the following nominal concentrations expressed as lg a.i.…”

Section: Methodsmentioning

confidence: 99%

Sensitivity of preparasitic stages of Chordodes nobilii (Gordiida, Nematomorpha) to malathion

2009

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The largest part of the life cycle of Gordiida, known as horsehair worms, occurs in aquatic environments usually affected by agricultural activities. The free-living adults reproduce in freshwater environments, where preparasitic larvae undergo development. Since malathion is an insecticide used in the distribution area of Chordodes nobilii, the aim of this study is to evaluate the effect of malathion concentrations which might be expected in the environment on preparasitic stages of this species. The embryonic development and the viability of larvae were analyzed after a short-term exposure to malathion concentrations ranging between 36 and 220 microg a.i./l. Embryo development was inhibited at 220 microg a.i./l and the infective capacity of larvae derived from malathion-exposed eggs was significantly decreased starting from the lowest concentration. Larvae developed from malathion-exposed eggs exhibited malformations. Directly exposed larvae also showed decreased infectivity since the lowest assayed concentration. Our results indicate that a short-term exposure to malathion at levels potentially present in the surface water in environments inhabited by Chordodes nobilii affects significantly its preparasitic stages and the infective capacity of parasitic larvae.

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Toxicity of the herbicide glyphosate to Chordodes nobilii (Gordiida, Nematomorpha)

Cited by 34 publications

References 23 publications

New evidences of Roundup® (glyphosate formulation) impact on the periphyton community and the water quality of freshwater ecosystems

New evidences of Roundup® (glyphosate formulation) impact on the periphyton community and the water quality of freshwater ecosystems

ISOLATION AND CHARACTERIZATION OF A MOLYBDENUM-REDUCING AND GLYPHOSATE-DEGRADING Klebsiella oxytoca STRAIN SAW-5 IN SOILS FROM SARAWAK

Sensitivity of preparasitic stages of Chordodes nobilii (Gordiida, Nematomorpha) to malathion

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