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Ceriodaphnia
dubia—the water flea
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Ceriodaphnia dubia, a
tiny aquatic invertebrate, is used as an indicator organism to measure
toxicity in water. C. dubia is considered to be a representative
of important
creek organisms at the bottom of the food web. Toxicity
to this species is believed to indicate poor water quality.
Diazinon and chlorpyrifos have been identified as impairing water quality
because they are occurring at levels toxic to Ceriodaphnia dubia.
These pesticides can cause toxicity to Ceriodaphnia at very low
levels.
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