Título:	Comparative toxicity of Euphorbia milii latex and synthetic molluscicides to Biomphalaria glabrata embryos
Autoria:	OLIVEIRA FILHO, E. C. de GERALDINO, B. R. COELHO, D. R. DE-CARVALHO, R. R. PAUMGARTTEN, F. J. R.
Afiliação:	EDUARDO CYRINO DE OLIVEIRA FILHO, CPAC; BARBARA R. GERALDINO, FIOCRUZ; DEISE R. COELHO, FIOCRUZ; ROSÂNGELA R. DE-CARVALHO, FIOCRUZ; FRANCISCO J. R. PAUMGARTTEN, FIOCRUZ.
Ano de publicação:	2010
Referência:	Chemosphere, v. 81, p. 218-227, 2010.
Páginas:	p. 218-227
Conteúdo:	Abstract: Plant molluscicides have been regarded as possible alternatives to the costly and environmentally hazardous molluscicides currently available. This study was undertaken to compare the developmental toxicity of a plant molluscicide (Euphorbia milii latex, LAT) with that of three synthetic molluscicidal compounds. Biomphalaria glabrata egg masses (0–15 h after spawning) were exposed to molluscicides for 96 h and thereafter examined up to the 14th day after spawning. Embryo deaths, abnormal embryo development (malformations) and the day of hatching were recorded. Although exhibiting a weak ovicidal effect, LAT markedly impaired the development of snail embryos at concentrations ⩾1000 μg L−1 and produced anomalies (EC50 = 2040 μg L−1) such as abnormal shells, hydropic embryos, cephalic and non-specific malformations. Embryolethal potencies of molluscicides were as follows: triphenyltin hydroxide (TPTH; LC50 = 0.30 μg L−1) > niclosamide (NCL; LC50 = 70 μg L−1) > copper sulphate (CuSO4; LC50 = 2190 μg L−1) LAT (LC50 = 34 030 μg L−1). A few malformations were recorded in embryos exposed to concentrations of TPTH within the range of lethal concentrations, while almost no anomalies were noted among those treated with NCL or CuSO4. A hatching delay (hatching on day 10 after spawning or later) was observed among LAT-exposed embryos. The effects of NCL, TPTH and CuSO4 on hatching were to some extent masked by their marked embryolethality. The no-observed effect concentrations (NOEC) for embryotoxicity were as follows: TPTH, 0.1 μg L−1; NCL, 25.0 μg L−1; CuSO4, 500.0 μg L−1 and LAT, 500.0 μg L−1. Results from this study suggest that, although LAT was not acutely embryolethal after a short-term exposure, it markedly disrupted snail development. The marked embryotoxicity of E. milii possibly contributes to its effectiveness as a molluscicide.
Thesagro:	Molusco Moluscicida Caracol Biomphalaria Glabrata
NAL Thesaurus:	Embryotoxicity Snails Euphorbia milii Molluscicides
Digital Object Identifier:	https://doi.org/10.1016/j.chemosphere.2010.06.038
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAC)