English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/12432
Título

Aquatic ecotoxicity of a pheromonal antagonist in Daphnia magna and Desmodesmus subspicatus

AutorRosa, Esmeralda; Barata Martí, Carlos; Damásio, Joana B.; Bosch, María Pilar; Guerrero, Ángel
Palabras claveDaphnia
Desmodesmus
Sesamia nonagrioides
Ecotoxicity
Trifluoromethyl ketones
Pheromone
Antagonist
Fecha de publicación3-jul-2006
EditorElsevier
CitaciónAquatic Toxicology 79(3): 296-303 (2006)
ResumenEvaluation of the ecotoxicological potential of (Z)-11-hexadecenyl trifluoromethyl ketone (Z11-16:TFMK), a new biorational agent with high prospective features to control the Mediterranean corn borer Sesamia nonagrioides in infested maize fields, in comparison to the parent pheromone compound (Z)-11-hexadecenyl acetate (Z11-16:Ac) is described. Acute and sublethal toxicity tests of both compounds against the cladoceran Daphnia magna and the chlorophyte Desmodesmus subspicatus were conducted, the endpoints being immobilisation and feeding inhibition for Daphnia and growth rate inhibition for Desmodesmus. In addition, effects on B esterases including cholinesterase and carboxylesterase activities in Daphnia were also assessed to evaluate the mode of action of both chemicals. Toxicities of both compounds were moderate with EC50 values ranging from 3.11 to 103.74 mg l−1 in algae growth, from 0.07 to 1.20 mg l−1 in Daphnia survival, and from 0.10 to 0.53 mg l−1 in Daphnia feeding rate. In all cases Z11-16:TFMK was more toxic than the naturally occurring pheromone component. Serine esterase assays showed a strong inhibition of the carboxylesterase activities in Daphnia at concentrations with apparently no effects on survival or feeding, suggesting that inhibition of other key esterases may be the possible mechanism of toxicity of this compound. The results obtained have been related with some physico-chemical properties of the compounds, such as water solubility and octanol–water partition coefficient, suggesting that Z11-16:TFMK may affect aquatic organisms at lower concentrations than expected from non-polar narcosis.
Descripción8 pages, 4 figures, 2 tables.-- PMID: 16899308 [PubMed].-- Printed version published Sep 12, 2006.
Versión del editorhttp://dx.doi.org/10.1016/j.aquatox.2006.06.019
URIhttp://hdl.handle.net/10261/12432
DOI10.1016/j.aquatox.2006.06.019
ISSN0166-445x
Aparece en las colecciones: (IQAC) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.