The Microtox test was evaluated as a tool to measure the presence of p
horate, an organophosphate insecticide, in northern prairie wetlands.
Microtox test results were inconsistent with results of other in situ
toxicity tests with aquatic invertebrates and ducklings. The Microtox
test often indicated no toxicity, even though both invertebrates and d
ucklings died. Caution should be used when interpreting the results of
the Microtox test to evaluate wetlands for pesticide contamination.