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TOXSWA |
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Experimental research |
Dutch-registration |
EU-registration |
Toxswa team |
References |
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TOXSWA |
Because you have no Flash-player installed on your computer, you get to see a simplified version of our menu |
Experimental research |
Dutch-registration |
EU-registration |
Toxswa team |
References |
| Research is performed in co-operation with the theme 'Aquatic risk assessment' in experimental systems ranging from laboratory-scale systems, via microcosms and 1 m wide enclosures, to outdour experimental ditches of 40 m length each. The use of microcosms, enclosures and ditches provides a bridge between the laboratory and the field. |
There with providing the opportunity to do higher tier exposure assissment, estimate process parameters
and validate fate models. Data were collected on the fate of several pesticides to support higher-tier exposure assessments. Some of these data sets are currently used to validate the main processes of the TOXSWA model. Contact for more information:ir. Wim Beltman |
| For the ecological risk assessment of pesticides, microcosm and mesocosm experiments are carried out (indoor and field studies). Microcosms, mesocosms, experimental ditches and enclosures are all model ecosystems, i.e. experimental systems which mimic parts of natural ecosystems. The complexity of these systems has to be high enough to include direct and indirect interactions, e.g. intraspecific and interspecific competition for food and nutrients, between all structurally and functionally important groups. |
The use of microcosms or mesocosms provides a bridge between the laboratory
and the field, in terms of providing the opportunity to perform
ecosystem-level research in replicable test systems. The systems provide
realism in terms of ecological processes and exposure to the chemical. We
have various microcosms and mesocosms in operation. They vary in size and
consequently in ecosystem complexity and realism. The whole range of test
systems include small plankton-dominated aquaria and macrophyte-dominated
microcosms in the laboratory as well as more complex, semi-field mesocosms
and outdoor experimental ditches.
Contact for more information:Dr. Theo C.M. Brock |
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indoor microcosm experiment |
outdoor mesocosm experiment |
outdoor field study under controlled conditions |
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microcosm multi-species experiments |
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outdoor microcosms |
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| aerial overview of the experimental ditches of Wageningen University and Research Centre | close-up of one of the experimental ditches | enclosure with emergence trap in an experimental ditch |
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application of pesticides to one of the experimental ditches |
application of pesticides to one of the experimental ditches during very good weather |
taking a water sample from one of the experimental ditches |
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Effects of a combination of pesticides on macrophyte biomass |
Effects of a combination of pesticides on the survival of Asellus aquaticus in bioassays |
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