Abstract

The impact of 2,4-dichlorophenoxyacetic acid (2,4-D) (applied at 1 mg 2,4-D/l as an aquatic herbicide) on the natural macrobenthic community in artificial pond ecosystems was evaluated in 6 identical ponds planted with Eurasian water milfoil ( Myriophyllum spicatum). Four ponds were treated with 2,4-D, 2 receiving the N, N-dimethylamine salt, and 2 the butoxyethyl ester. The benthic macroinvertebrate communities showed no primary effects due to treatment. Secondary effects appeared over a period of months, and by 338 days after treatment the diversity in treated ponds was significantly ( P<0.05) lower than the diversity in control ponds. Treated ponds were numerically dominated by Tubificidae, while several genera of Chironomidae, Gastropoda, and Tubificidae were numerically codominant in the control ponds.

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