IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Do the neonicotinoid insecticide imidacloprid affect the aquatic macrophyte Myriophyllum quitense? A multiple biomarker study.
Autor/es:
GARANZINI D.S.; MENONE M.L.; ITURBURU F.G.
Lugar:
Wiscosin, Madison.
Reunión:
Encuentro; 7th SETAC Young Environmental Scientists Meeting.; 2018
Institución organizadora:
SETAC
Resumen:
The neonicotinoid imidacloprid (IMI) is a systemic insecticide widely used on crop protection. This hydrophyllic compound is under review by different government agencies because the unexpected effects of IMI on non-target organisms, mainly on invertebrates. Besides the toxicity on these organisms, other components of the aquatic community could be affected, like fish or macrophytes. In this context, the objective of this work was to evaluate the effects of IMI on the macrophyte Myriophyllum quitense, both on conventional parameters (growth) as on sublethal biochemical biomarkers related with oxidative stress and photosynthetic pigments concentration. For this purpose, two bioassays were performed. One testing biomarkers in plants exposed to 1, 10, 100 and 1000 μg/L IMI during 48 h and the other using 10, 100, 1000, 10000 and 20000 µg/L IMI and 14 days. At 48 h there was a decrease of chlorophyll A and B concentrations as well as an increase of H2O2 and lipid peroxidation in plants exposed to low IMI concentrations. These effects seem not to be kept on time because after 14 days of exposure, plant growth was not affected by any IMI concentration, and there was an increase of carotenoids and chlorophylls A and B concentrations, but only at the highest assayed concentration (20000 ug/L IMI). The results showed that after a short term exposure to environmentally relevant IMI concentrations, sublethal effects could be produced in M. quitense, while a longer exposure time seems not to affect plant growth.