HA12 Environmental Risk Assessment: Global Perspectives
B115 & B116
8:00 AM - 12:00 PM, Thursday
() Fate and effects of the insecticide chlorpyrifos: comparison between temperate and tropical conditions.
Daam, M.A.1, Nogueira, A.J.A.1, Van den Brink, P.J.2, Yakupitiyage, A.3, Satapornvanit, K.3, 4, 5, 1 University of Aveiro, Portugal2 ALTERRA, The Netherlands3 Asian Institute of Technology, Thailand4 Kasetsart University, Thailand5 University of Stirling, United Kingdom
ABSTRACT- In tropical agricultural areas, pesticides are used increasingly to improve productivity of crops. As only few ecotoxicological studies have been undertaken so far in tropical regions, knowledge regarding fate and toxic effects of pesticides is still scarce. This paper aims to provide more insight in the fate and ecological effects of pesticide stress on freshwater ecosystems in tropical regions. For this a microcosm study with the insecticide chlorpyrifos was performed at the Asian Institute of Technology in Thailand. Pesticide fate, direct effects on (zoo)plankton and macro-invertebrate communities and following indirect effects were determined. Furthermore, an additional experiment with two subsequent chlorpyrifos applications was made to come to a better understanding of recovery of tropical zooplankton communities. In this paper the results of these experiments will be presented and a comparison with results from studies performed in temperate regions will be made. Also the implications for risk assessment in tropical regions will be discussed.
Key words: ecological risk assessment, pesticides, microcosm study, tropic