|
Interactive Poster Session: Soil Ecotoxicology (TU18/9) Effect of Fenoxycarb, a juvenile hormone analogue, on the soil invertebrate Folsomia candida. Campiche, Sophie1, Becker-van Slooten, Kristin1, Tarradellas, Joseph1, 1 EPFL, Lausanne, Switzerland, Switzerland ABSTRACT- Endocrine effects are mainly evaluated on aquatic organisms and on vertebrates. Little knowledge is available on soil invertebrates, although they have an essential ecological role. The objective of this study is to investigate the sublethal effects of potential endocrine disrupting chemicals on collembola. The organism used for this study is the springtail Folsomia candida (Isotomidae). It is an ecologically relevant and widely used organism in ecotoxicology, having a fairly short generation time. The compound tested is the insecticide fenoxycarb, an insect growth regulator (IGR). It is an analogue of the insect juvenile hormone and can therefore be considered as an endocrine disruptor. Artificial OECD soil was contaminated with different amounts of fenoxycarb (from 0.05 ug/g to 2500 ug/g). Two days old organisms were exposed individually to compressed contaminated soil for about 30 days. Parameters such as number of eggs and hatched juveniles as well as mortality of adults were observed. Results show that fenoxycarb probably has two different modes of action. Very low concentrations (0.16-0.8 ug/g) induce a reduction of the number of laid eggs, which might be due to an endocrine effect. Fenoxycarb only shows an effect on the number of laid eggs, not on the hatching of the juveniles. At higher concentrations (2500 ug/g) adult mortality is observed, probably due to narcosis. Key words: Fenoxycarb, Folsomia candida, Soil invertebrate, Insecticide |
