Actue Toxic Effects of Round-Up Herbicide on Wood Frog Tadpoles (<i>Rana sylvatica</i>)

Comstock, Brett A.; Sprinkle, Spencer L.; Smith, Geoffrey R.

doi:10.1080/02705060.2007.9664831

Cited by 8 publications

(6 citation statements)

References 20 publications

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“…Mann and Bidwell (1999b) examined the toxicity of a widely used commercial glyphosate formulation (Roundup Ò Herbicide) to four species of Australian anurans (Crinia insignifera, Heleioporus eyrei, Limnodynastes dorsalis and Litoria moorei) and reported markedly lower 48 h LC50 values for these formulations (2.9-11.6 mg acid equivalent (ae)/L) compared to the active constituent, glyphosate isopropylamine (>340 mg ae/L). Subsequent studies in a variety of species have confirmed the relatively high toxicity of glyphosatebased products containing POEA when exposed to amphibian larvae (Smith, 2001;Lajmanovich et al, 2003;Chen et al, 2004;Edginton et al, 2004b;Relyea, 2004aRelyea, , 2005aRelyea and Jones, in press;Cauble and Wagner, 2005;Comstock et al, 2007) and similarly found POEA to be responsible for the toxicity (Perkins et al, 2000;Edginton et al, 2004a;Howe et al, 2004). In acute toxicity tests, the toxic effects of POEA on aquatic biota appears to be associated with interference with gill morphology (Cardellini and Ometto, 2001;Lajmanovich et al, 2003), with mortality likely being the result of either the loss of osmotic stability or asphyxiation.…”

Section: Glyphosate Formulations -A Special Casementioning

confidence: 92%

Amphibians and agricultural chemicals: Review of the risks in a complex environment

Mann

Hyne²,

Choung

et al. 2009

Environmental Pollution

511

334

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Section: Glyphosate Formulations -A Special Casementioning

confidence: 92%

Amphibians and agricultural chemicals: Review of the risks in a complex environment

Mann

Hyne²,

Choung

et al. 2009

Environmental Pollution

511

334

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“…Apparently, the surfactants or adjuvants added to the formulation could contribute to these effects. In fact, it has been demonstrated that polyoxyethylene tallow amine (POEA), a glyphosate surfactant, contributes to the high toxicity of glyphosate-based products (Perkins et al, 2000;Howe et al, 2004;Comstock et al, 2007;Mann et al, 2009) and that there could be a synergistic effect of the surfactant and other ingredients of glyphosate-based products (Comstock et al, 2007). Aside POEA, other surfactants such as nonylphenol ethoxylate (NPE) and alcohol alkoxylate have been found to be toxic (Mann & Bidwell, 2001).…”

Section: Introductionmentioning

confidence: 99%

Commercially formulated glyphosate can kill non‐target pollinator bees under laboratory conditions

Abraham

Benhotons

Krampah

et al. 2018

Entomologia Exp Applicata

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The use of glyphosate‐based herbicides in agroecosystems has increased over the past few years because of the advent of genetically modified glyphosate‐resistant crops and resistant weeds. This is alarming because of potential damaging effects on non‐target organisms. In sub‐Saharan Africa, for example Ghana, many rural farmers have not received training in the use of glyphosate‐based herbicides, thus tend to apply higher than recommended concentrations on farms. Therefore, this study investigated the effect of glyphosate‐based herbicides on beneficial insects under laboratory conditions, using Apis mellifera L. (Hymenoptera: Apidae, Apini) and Hypotrigona ruspolii (Magretti) (Hymenoptera: Apidae, Meliponini) as models. The bees were put in contact for 24 h with the recommended concentration of Sunphosate 360 SL, a glyphosate‐based herbicide, 2× the recommended concentration, or distilled water as control. The effect of the herbicide on the bees was compared to the effect of a lambda‐cyhalothrin insecticide. Generally, more bees died after contact with plants freshly sprayed with the herbicide than on herbicide‐treated filter paper. In both cases, more bees died after contact with the higher concentration of the herbicide. These findings suggest that beneficial insects, specifically A. mellifera and H. ruspolii, may get killed if they are sprayed upon or come into contact with plants that have been freshly sprayed with (more than) the recommended concentration of glyphosate‐based herbicides. Therefore, it is important to restrict access and use of such herbicides to trained personnel who will comply with spraying guidelines, that is, recommended concentrations and timing of spray. Spraying at a time when insects are flying about may be detrimental to beneficial insects such as pollinator bees, parasitoids, and predators.

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“…Due to its relatively rapid dissipation, it can be assumed that most glyphosate values measured directly in the environment are probably below the peak concentrations present directly after herbicide applications or after downpour. However, knowing maximum concentrations—even if they prevail for short periods only—is crucial because most studies observed acute toxic effects of glyphosate‐based herbicides on tadpoles, that is, immediately within the first 24 h after tadpoles were exposed to the glyphosate‐based herbicide .…”

Section: Introductionmentioning

confidence: 99%

Questions concerning the potential impact of glyphosate‐based herbicides on amphibians

Wagner

Reichenbecher

Teichmann

et al. 2013

Enviro Toxic and Chemistry

146

107

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Use of glyphosate-based herbicides is increasing worldwide. The authors review the available data related to potential impacts of these herbicides on amphibians and conduct a qualitative meta-analysis. Because little is known about environmental concentrations of glyphosate in amphibian habitats and virtually nothing is known about environmental concentrations of the substances added to the herbicide formulations that mainly contribute to adverse effects, glyphosate levels can only be seen as approximations for contamination with glyphosate-based herbicides. The impact on amphibians depends on the herbicide formulation, with different sensitivity of taxa and life stages. Effects on development of larvae apparently are the most sensitive endpoints to study. As with other contaminants, costressors mainly increase adverse effects. If and how glyphosate-based herbicides and other pesticides contribute to amphibian decline is not answerable yet due to missing data on how natural populations are affected. Amphibian risk assessment can only be conducted casespecifically, with consideration of the particular herbicide formulation. The authors recommend better monitoring of both amphibian populations and contamination of habitats with glyphosate-based herbicides, not just glyphosate, and suggest including amphibians in standardized test batteries to study at least dermal administration.

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Actue Toxic Effects of Round-Up Herbicide on Wood Frog Tadpoles (Rana sylvatica)

Cited by 8 publications

References 20 publications

Amphibians and agricultural chemicals: Review of the risks in a complex environment

Amphibians and agricultural chemicals: Review of the risks in a complex environment

Commercially formulated glyphosate can kill non‐target pollinator bees under laboratory conditions

Questions concerning the potential impact of glyphosate‐based herbicides on amphibians

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