IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Imidacloprid accumulation in gills, blood and brain of the freshwater fish Australoheros facetus: an experimental approach.
Autor/es:
ITURBURU, GASTÓN; CONTARDO-JARA, VALESKA; MENONE, MIRTA LUJÁN; PFLUGMACHER- LIMA STEPHAN
Lugar:
Petnica
Reunión:
Congreso; 4th Young Environmental Scientist Meeting (SETAC); 2015
Institución organizadora:
SETAC
Resumen:
Imidacloprid (IMI) is a worldwide neonicotinoid insecticide used in several crops. Nowadays, it is under revision in the European Union because of its possible effects on non-target organisms, such as pollinators. The aim of this work was to study the uptake and distribution of IMI in fishes. The cichlid Australoheros facetus was exposed to 100, 300 and 2500 µg L-1 IMI during 24 and 48 h. The determination and quantification of IMI in gills, blood and brain was performed by LC?MS/MS. IMI concentration was higher as higher the concentration in water, in all the tissues analyzed, both at 24 and 48 h. Bioconcentration factors (BCFs) were calculated as the ratio of IMI concentration in the tissue (µg Kg-1 dry weight) to IMI concentration in water (µg L-1). In gills, BCFs did not varied among the three IMI concentrations tested but it were higher at 48 than at 24 h. These results confirm the organ as a main route of exposure, mainly in this case for an hydrophilic compound (log Kow = 0.57). In addition, they indicated that IMI accumulation is mainly influenced by the time of exposure. Blood and brain presented a similar BCF pattern, being lower BCF as higher the concentration in water. On the other hand, BCF were similar between 24 and 48 h. These results indicated that IMI could overpass the brain-blood barrier (BBB), which is an essential structure for maintaining brain homeostasis and protecting the organ from toxic substances. Our results highlight about the importance of IMI accumulation in essential tissues of freshwater fishes. Further studies are necessary to explore potential adverse effects in these aquatic organisms.