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dc.contributor.author
Brodeur, Celine Marie Julie  
dc.contributor.author
Fonseca Peña, Shirley Vivian Daniela  
dc.date.available
2023-12-15T13:19:53Z  
dc.date.issued
2023-03  
dc.identifier.citation
Brodeur, Celine Marie Julie; Fonseca Peña, Shirley Vivian Daniela; Effects of the neonicotinoid insecticides thiamethoxam and imidacloprid on metamorphosis of the toad Rhinella arenarum at environmentally-relevant concentrations; Taylor & Francis; Journal of Toxicology and Environmental Health-Part A-Current Issues; 86; 13; 3-2023; 434-445  
dc.identifier.issn
1528-7394  
dc.identifier.uri
http://hdl.handle.net/11336/220412  
dc.description.abstract
The goal of the present study was to examine the effects of environmentally relevant concentrations of the neonicotinoid insecticides thiamethoxam and imidacloprid on the metamorphosis of the toad Rhinella arenarum. Tadpoles were exposed from stage 27 until completion of metamorphosis to concentrations of thiamethoxam ranging between 1.05 and 1050 µg/L and concentrations of imidacloprid varying between 3.4 and 3400 µg/L. The two neonicotinoids were found to act differently at the range of concentrations tested. Thiamethoxam did not markedly alter the final % tadpoles completing metamorphosis but extended by 6–20 days the time needed for tadpoles to complete metamorphosis. The extra number of days required to reach metamorphosis was concentration-dependent between 1.05 and 100.5 µg/L, and then stable at 20 days between 100.5 and 1005 µg/L. In contrast, imidacloprid did not significantly interfere with the overall time needed to complete metamorphosis but decreased success of metamorphosis at 3400 µg/L, the highest concentration tested. Both neonicotinoid concentrations did not markedly alter body size and weight of the newly metamorphosed toads. With a lowest observed effect concentration (LOEC) of 1.05 µg/L, thiamethoxam may be more likely to impact tadpole development in the wild compared to imidacloprid, which was without any apparent effect at concentrations up to 340 µg/L (no-observed effect concentration or NOEC). As the influence of thiamethoxam was triggered after tadpoles had reached Stage 39, when metamorphosis is strictly dependent upon thyroid hormones, this observed effect is attributed to result from actions of this neonicotinoid insecticide on the hypothalamic-pituitary-thyroid axis.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Taylor & Francis  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
anfibios  
dc.subject
plaguicidas  
dc.subject
contaminación  
dc.subject.classification
Otras Ciencias Biológicas  
dc.subject.classification
Ciencias Biológicas  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
Effects of the neonicotinoid insecticides thiamethoxam and imidacloprid on metamorphosis of the toad Rhinella arenarum at environmentally-relevant concentrations  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-12-14T12:48:46Z  
dc.journal.volume
86  
dc.journal.number
13  
dc.journal.pagination
434-445  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Brodeur, Celine Marie Julie. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Recursos Biológicos; Argentina  
dc.description.fil
Fil: Fonseca Peña, Shirley Vivian Daniela. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.journal.title
Journal of Toxicology and Environmental Health-Part A-Current Issues  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1080/15287394.2023.2213259