Sensitivity to the pyrethroids deltamethrin and esfenvalerate (aqueous solution) and LC50 have been determined in acute (96-h) toxicological tests on mayfly larvae (Cloeon dipterum and Caenis miliaria), damselfly larvae (Lestes sponsa and Cordulia aenea), and juveniles from a laboratory culture of Daphnia magna. Sensitivity to deltamethrin increases in the series C. aenea (Odonata) < D. magna (Cladocera) < L. sponsa (Odonata) < C. miliaria(Ephemeroptera) < C. dipterum (Ephemeroptera), and that to esfenvalerate, in the series C. aenea < D. magna < L. sponsa ≈ C. miliaria ≈ C. dipterum. The values of LC50 about 0.01 μg/l determined for mayfly larvae are below those known for various hydrobionts from the literature, indicating a very high sensitivity of these insects to pyrethroids.
Russian Journal of Ecology – Springer Journals
Published: Oct 18, 2004
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