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Título

Determining pesticide exposure scenarios for reptiles

AutorOrtiz-Santaliestra, Manuel E.
Fecha de publicación2016
CitaciónXIV Congreso Luso-Español de Herpetología y XVIII Congreso Español de Herpetología (2016)
ResumenPesticide risk assessment on terrestrial vertebrates is based on oral exposure of birds and mammals, being such scenario considered to cover risks to reptiles. However, topic exposure during egg incubation, as well as dermal uptake and/or overspray of pesticides once hatchlings leave the nest could constitute relevant exposure ways for reptiles. We conducted a two-stage exposure of Podarcis muralis eggs and hatchlings to three pesticides in order to analyse the effects of pesticide exposure on each developmental stage and to compare the relative importance of dermal and oral exposure of juveniles through different exposure routes. Eggs were incubated in soils previously sprayed with a pesticide solution corresponding to 40% of the field application rate (to consider relevant crop interception) of formulations of either glufosinate ammonium (herbicide), folpet (fungicide) or fenpyroximate (insecticide). Eggs exposed to folpet hatched with a lower body mass than controls, whereas fenpyroximate showed effects on morphological differentiation. Upon hacthing, animals were assigned to a juvenile treatment consisting in the exposure through spiked soil (dermal) or food (oral) in a factorial block design considering both in-ovo and hatchling exposure. Concentrations during the hacthling exposure corresponded to 25% of the application rate. Interestingly, egg exposure but not hatching exposure determined the body mass gain during the post-hatch stage of lizards exposed to glufosinate ammonium, which highlights the importance of considering lagged effects in pesticide risk assessment. Effects of pesticides on juveniles exposed either dermally or orally were very similar, which suggests the convenience of considering dermal exposure in risk assessment for reptiles as an additional route of pesticide uptake.
DescripciónResumen del trabajo presentado al XIV Congreso Luso-Español de Herpetología y XVIII Congreso Español de Herpetología: "Retos de la Herpetología en el siglo XXI", celebrado en Lleida (España) del 5 al 8 de octubre de 2016.-- et al.
URIhttp://hdl.handle.net/10261/146914
Aparece en las colecciones: (IREC) Comunicaciones congresos
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