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Artículo

Environmentally-relevant concentrations of atrazine induce non-monotonic acceleration of developmental rate and increades size metamorphosis in Rhinella arenarum tadpoles

Brodeur, Celine Marie JulieIcon ; Sassone, Alina GriselIcon ; Hermida, Gladys Noemí; Codugnello, Nadia BeatrizIcon
Fecha de publicación: 03/2013
Editorial: Elsevier
Revista: Ecotoxicology and Environmental Safety
ISSN: 0147-6513
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Despite of the various studies reporting on the subject, anticipating the impacts of the widely-used herbicide atrazine on anuran tadpoles metamorphosis remains complex as increases or decreases of larval period duration are almost as frequently reported as an absence of effect. The aim of the present study was to examine the effects of environmentally-relevant concentrations of atrazine (0.1, 1, 10, 100, and 1000 μg/L) on the timings of metamorphosis and body size at metamorphosis in the common South American toad, Rhinella arenarum (Anura: bufonidae). None of the atrazine concentrations tested significantly altered survival. Low atrazine concentrations in the range of 1–100 μg/L were found to accelerate developmental rate in a non-monotonic U-shaped concentration–response relationship. This observed acceleration of the metamorphic process occurred entirely between stages 25 and 39; treated tadpoles proceeding through metamorphosis as control animals beyond this point. Together with proceeding through metamorphosis at a faster rate, tadpoles exposed to atrazine concentrations in the range of 1–100 μg/L furthermore transformed into significantly larger metamorphs than controls, the concentration–response curve taking the form of an inverted U in this case. The no observed effect concentration (NOEC) was 0.1 μg atrazine/L for both size at metamorphosis and timings of metamorphosis. Tadpoles exposed to 100 μg/L 17β-estradiol presented the exact same alterations of developmental rate and body size as those treated with 1, 10 and 100 μg/L of atrazine. Elements of the experimental design that facilitated the detection of alterations of metamorphosis at low concentrations of atrazine are discussed, together with the ecological significance of those findings.
Palabras clave: Amphibian , Atrazine , Agriculture , Pesticide , Hormesis
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/28012
DOI: http://dx.doi.org/10.1016/j.ecoenv.2013.01.019
URL: http://www.sciencedirect.com/science/article/pii/S0147651313000353
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Brodeur, Celine Marie Julie; Sassone, Alina Grisel; Hermida, Gladys Noemí; Codugnello, Nadia Beatriz; Environmentally-relevant concentrations of atrazine induce non-monotonic acceleration of developmental rate and increades size metamorphosis in Rhinella arenarum tadpoles; Elsevier; Ecotoxicology and Environmental Safety; 92; 3-2013; 10-17
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