Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations
The present study examined the acute and chronic toxicity of the neonicotinoid insecticides imidacloprid (IMI) and thiamethoxam (TIA) on the neotropical amphibian species Rhinella arenarum, Rhinella fernandezae and Scinax granulatus. The median lethal concentration after 96 hr exposure (96 hr-LC50)...
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| Format: | Artículo |
| Language: | Inglés |
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Taylor and Francis
2023
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| Online Access: | http://hdl.handle.net/20.500.12123/15797 https://www.tandfonline.com/doi/abs/10.1080/15287394.2023.2213259 https://doi.org/10.1080/15287394.2023.2213259 |
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| author | Brodeur, Celine Marie Fonseca Peña, Shirley Vivian Danie |
| author_browse | Brodeur, Celine Marie Fonseca Peña, Shirley Vivian Danie |
| author_facet | Brodeur, Celine Marie Fonseca Peña, Shirley Vivian Danie |
| author_sort | Brodeur, Celine Marie |
| collection | INTA Digital |
| description | The present study examined the acute and chronic toxicity of the neonicotinoid insecticides imidacloprid (IMI) and thiamethoxam (TIA) on the neotropical amphibian species Rhinella arenarum, Rhinella fernandezae and Scinax granulatus. The median lethal concentration after 96 hr exposure (96 hr-LC50) ranged between 11.28 and >71.2 mg/L amongst all species and development stages tested, indicating that these pesticides are not likely to produce acute toxicity in the wild. The subchronic toxicity was also low, with 21 day-LC50 values ranging between 27.15 and >71.2 mg/L. However, tadpoles of Rhinella arenarum exposed to thiamethoxam from stage 27 until completion of metamorphosis presented a significantly lower metamorphic success rate together with a smaller size at metamorphosis, starting from the lowest concentration tested. Although a number of studies previously examined the effects of neonicotinoids on amphibian tadpoles, these investigations focused on the time to metamorphosis and reported a variety of results including retardation, acceleration or lack of effect. Here, data demonstrated that thiamethoxam predominantly impacts metamorphosis through reduction of the transformation success and body weight, rather than by affecting the timings of metamorphosis. By closely monitoring progression of tadpoles through the different stages, impairment of metamorphosis was demonstrated to occur during the transition from stage 39 to 42, suggesting an effect on the thyroid system. An asymmetry in the length of the arms was also observed in metamorphs treated with thiamethoxam. Overall, these results indicate that thiamethoxam, and conceivably other neonicotinoids, have the potential to significantly impair metamorphosis of amphibians and diminish their performance and survival in the wild. |
| format | Artículo |
| id | INTA15797 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Taylor and Francis |
| publisherStr | Taylor and Francis |
| record_format | dspace |
| spelling | INTA157972023-11-02T10:41:00Z Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations Brodeur, Celine Marie Fonseca Peña, Shirley Vivian Danie Toads Frogs Metamorphosis Neonicotinoid Insecticides Pesticides Agriculture Sapo Rana Metamorfosis Insecticidas Neonicotinoides Plaguicidas Agricultura The present study examined the acute and chronic toxicity of the neonicotinoid insecticides imidacloprid (IMI) and thiamethoxam (TIA) on the neotropical amphibian species Rhinella arenarum, Rhinella fernandezae and Scinax granulatus. The median lethal concentration after 96 hr exposure (96 hr-LC50) ranged between 11.28 and >71.2 mg/L amongst all species and development stages tested, indicating that these pesticides are not likely to produce acute toxicity in the wild. The subchronic toxicity was also low, with 21 day-LC50 values ranging between 27.15 and >71.2 mg/L. However, tadpoles of Rhinella arenarum exposed to thiamethoxam from stage 27 until completion of metamorphosis presented a significantly lower metamorphic success rate together with a smaller size at metamorphosis, starting from the lowest concentration tested. Although a number of studies previously examined the effects of neonicotinoids on amphibian tadpoles, these investigations focused on the time to metamorphosis and reported a variety of results including retardation, acceleration or lack of effect. Here, data demonstrated that thiamethoxam predominantly impacts metamorphosis through reduction of the transformation success and body weight, rather than by affecting the timings of metamorphosis. By closely monitoring progression of tadpoles through the different stages, impairment of metamorphosis was demonstrated to occur during the transition from stage 39 to 42, suggesting an effect on the thyroid system. An asymmetry in the length of the arms was also observed in metamorphs treated with thiamethoxam. Overall, these results indicate that thiamethoxam, and conceivably other neonicotinoids, have the potential to significantly impair metamorphosis of amphibians and diminish their performance and survival in the wild. Fil: Brodeur, Celine Marie Julie. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fil: Fonseca Peña, Shirley V.D. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. 2023-11-02T10:27:19Z 2023-11-02T10:27:19Z 2023-05-22 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/15797 https://www.tandfonline.com/doi/abs/10.1080/15287394.2023.2213259 1528-7394 https://doi.org/10.1080/15287394.2023.2213259 eng info:eu-repograntAgreement/INTA/2019-PE-E2-I054-001, Gestión sostenible de fitosanitarios info:eu-repo/semantics/restrictedAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Taylor and Francis Journal of Toxicology and Environmental Health Part A 86 (13) : 443-445. (2023) |
| spellingShingle | Toads Frogs Metamorphosis Neonicotinoid Insecticides Pesticides Agriculture Sapo Rana Metamorfosis Insecticidas Neonicotinoides Plaguicidas Agricultura Brodeur, Celine Marie Fonseca Peña, Shirley Vivian Danie Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations |
| title | Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations |
| title_full | Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations |
| title_fullStr | Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations |
| title_full_unstemmed | Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations |
| title_short | Effects of the neonicotinoid insecticides Thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally-relevant concentrations |
| title_sort | effects of the neonicotinoid insecticides thiamethoxam and imidacloprid on metamorphosis of the toad rhinella arenarum at environmentally relevant concentrations |
| topic | Toads Frogs Metamorphosis Neonicotinoid Insecticides Pesticides Agriculture Sapo Rana Metamorfosis Insecticidas Neonicotinoides Plaguicidas Agricultura |
| url | http://hdl.handle.net/20.500.12123/15797 https://www.tandfonline.com/doi/abs/10.1080/15287394.2023.2213259 https://doi.org/10.1080/15287394.2023.2213259 |
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