| fate and effects of the insecticide dursban 4e in indoor elodea-dominated and macrophyte-free freshwater model ecosystems: i. fate and primary effects of the active ingredient chlorpyrifos. | the fate of the insecticide dursban 4e (active ingredient chlorpyrifos) and its effect on crustaceans and insects was studied in indoor experimental freshwater ecosystems that intended to mimick drainage ditches. a single dose (simulating aerial drift) was applied to achieve nominal chlorpyrifos concentrations of 5 or 35 micrograms/l. two experiments were performed, one in which all model ecosystems were dominated by the macrophyte elodea nuttallii, and one using systems devoid of macrophytes. i ... | 1991 | 1379031 |