Abstract
Agricultural activity, especially the increasing use of pesticides, is considered one of the main reasons for the decline of amphibian populations. Mancozeb (MCZ) is one of the most used fungicides worldwide, despite its ancient use and toxicity demonstrated in different taxa. However, there is limited information about the effects of MCZ in amphibians, which are keystones of riparian ecosystems. For species conservation purposes, it is essential to identify the most sensitive developmental period(s) of a given species to a xenobiotic. We evaluated the toxicity of a commercial fungicide of mancozeb, (80% active ingredient) on the early development of the common South American toad Rhinella arenarum (Anura, Bufonidae). Embryos from early blastula (S.4) and larvae from complete operculum (S.25) stages were exposed to a wide range of MCZ concentrations during acute, subchronic and chronic exposure (up to 504 h) periods. The toxicity profiles for lethal and sublethal effects were performed. At all exposure times, MCZ was more toxic to embryos, for instance, NOEC 504 h were 0.01 and 0.05 mg MCZ/L for embryos and larvae, respectively. Thus, embryo sensitivity was 5-fold higher than larvae. A Teratogenic Index of 14 indicated the significant teratogenic potential of this fungicide. Among sublethal effects, embryos exhibited a wide range of abnormalities with high incidence. The ecological risk assessment demonstrated that the estimated Risk Quotient value for Rhinella arenarum embryos at chronic exposure was higher than the Level of Concern value, which warns about the potential risk of MCZ for this native species.
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Acknowledgments
The authors thank Ferring Pharmaceuticals Argentina, for providing human chorionic gonadotropin hormones and Institute of Analysis Fares Taie for the analytical determination.
Funding
Y. Asparch has received a fellowship from CONICET and from the Universidad Nacional de San Martín (UNSAM). This work was partially supported by UNSAM. This study was supported by a grant from CONICET (PIP 2014-2016 Res. 112-201301-00140-CO). C. Pérez Coll and G. Svartz are scientists of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).
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Asparch, Y., Svartz, G. & Pérez Coll, C. Toxicity characterization and environmental risk assessment of Mancozeb on the South American common toad Rhinella arenarum. Environ Sci Pollut Res 27, 3034–3042 (2020). https://doi.org/10.1007/s11356-019-07248-7
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DOI: https://doi.org/10.1007/s11356-019-07248-7