Imidacloprid induced alterations in enzyme activities and energy reserves of the land snail, Helix aspersa

Radwan, Mohamed; Magdy, Mohamed

doi:10.1016/j.ecoenv.2013.05.019

Cited by 53 publications

(29 citation statements)

References 42 publications

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“…Although we cannot provide direct evidence now, literature data confirm our suggestions. Altered AChE activity was reported in the tissues of a number of invertebrates treated by neonicotinoids including insects [100][101][102], earthworm [103], mussel [85] and snail [104]. We cannot exclude, therefore, that neonicotinoids interact with both the nAChR and the AChE enzyme, which share a common substrate, the ACh molecule.…”

Section: Discussionmentioning

confidence: 95%

Neonicotinoids: Spreading, Translocation and Aquatic Toxicity

Mörtl

Vehovszky

Klátyik

et al. 2020

IJERPH

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Various environmental and ecotoxicological aspects related to applications of neonicotinoid insecticides are assessed. Dosages of neonicotinoids applied in seed coating materials were determined and are compared to other applications (spray and granule). Environmental levels in soils and affecting factors in translocation are discussed. Excretion of neonicotinoids via guttation from coated maize seeds up to two months upon emergence, as well as cross-contamination of plants emerged from non-coated seeds or weeds nearby have been demonstrated. Contamination of surface waters is discussed in scope of a worldwide review and the environmental fate of the neonicotinoid active ingredients and the formulating surfactant appeared to be mutually affected by each other. Toxicity of neonicotinoid active ingredients and formulations on Daphnia magna completed with some investigations of activity of the detoxifying glutathione S-transferase enzyme demonstrated the modified toxicity due to the formulating agents. Electrophysiological results on identified central neurons of the terrestrial snail Helix pomatia showed acetylcholine antagonist (inhibitory) effects of neonicotinoid insecticide products, but no agonist (ACh-like) effects were recorded. These data also suggested different molecular targets (nicotinergic acetylcholine receptors and acetylcholine esterase enzyme) of neonicotinoids in the snail central nervous system.Before the approval of neonicotinoids in seed treatment, numerous insect pests were controlled with the use of in-furrow granular insecticides. Seed coating is regarded as a precise delivery method of pesticides, which is therefore more effective compared to other plant protection product (PPP) applications (e.g., spraying). Neonicotinoids persist long enough to provide an effective control on a broad spectrum of insects, which led to their increased adoption by growers. As for maize, an estimated annual average of 45% and 25% of the total crop cultivation in the US was treated with CLO and TMX, respectively (with annual maxima of 65% for CLO and 45% for TMX in any given year) [16], and corresponding average proportion of the use of seeds coated with CLO or TMX are 46%, 33%, 24% and 18% for sugar beet, cotton, sorghum and soybean, respectively [16]. In accordance with these maximum rates, nearly 100% of maize in the US and canola in Canada is cultivated from seeds coated with neonicotinoids [17] and often fungicides as well.One of the first signs of the environmental problem caused by neonicotinoids was detected in Germany in the spring 2008, when abrasion of active substance from treated seeds during sowing of maize led to mass poisonings incidents of bees [18]. Thereafter, substantial efforts were made to minimize the environmental impacts of these crop protection products. Improvements in seed coating technology (e.g., application of polymers) and modification of pneumatic planters have been introduced to reduce abrasion of the seed coating material during planting. Polymers in seed treatment not only i...

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Section: Discussionmentioning

confidence: 95%

Neonicotinoids: Spreading, Translocation and Aquatic Toxicity

Mörtl

Vehovszky

Klátyik

et al. 2020

IJERPH

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“…At the end of each time interval, the head-foot region from 6 randomly selected live snails of each experimental group (two animals from each container) was excised with sharp scissors and the cerebral ganglia were dissected and removed under stereomicroscope (Radwan and Mohamed, 2013). Cerebral ganglia were pooled and homogenized in 10 volumes (w/v) of 0.1 M phosphate buffer (pH 7.5) for 1 min.…”

Section: Tissue Preparationmentioning

confidence: 99%

“…The digestive gland of each snail was dissected, taken out, washed with ice-cold physiological saline (0.9%) and weighed. Digestive glands were pooled and homogenized in 10 volume of ice-cold saline solution for 1 min (Radwan and Mohamed, 2013). The homogenates were centrifuged at 4000g for 30 min at 4°C and the supernatant was used to assay the oxidative stress biomarkers.…”

Section: Tissue Preparationmentioning

confidence: 99%

Toxicological effects and oxidative stress responses in freshwater snail, Lanistes carinatus, following exposure to chlorpyrifos

Khalil

2015

Ecotoxicology and Environmental Safety

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“…Biomarkers found in aquatic and terrestrial organisms following exposure to pesticides have been intensively studied in order to predict the presence of pesticides in the environment (Henson-Ramsey et al, 2011;Jamec et al, 2010). Recently, many studies have reported the use of terrestrial organisms for developing biomarkers in response to residual pesticides (Henson-Ramsey et al, 2011;Radwan and Mohamed, 2013;Stepić et al, 2013), and among these, earthworms were widely used to understand the impacts of pesticides in the environment. In two earthworm species, Eisenia fetida and Lumbricus terrestris, multiple esterases, including acetylcholinesterase (AChE), butyrylcholinesterase, and carboxylesterase (CE), have been assessed as biomarkers for malathion exposure (HensonRamsey et al, 2011).…”

Section: Introductionmentioning

confidence: 99%