室内実験水路を用いた殺虫剤フェノブカルブの河川底生動物に対する急性毒性影響

概要

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Effects of fenobucarb, a methylcarbarnatc insecticide, on several species of aquatic insects were investigated using indoor model streams. Concentrations of fenobucarb residues in the water of the model streams were 78-85 % of its nominal level until 24 h, except at low concentrations (less than 20 μg1-1) in the water. The LC50 values of fenobucarb for the larvae of Ephemeroptera, Epeorus latifolium, Ecdyonurus yoshidae and Baetis thermicus were low (2-17 μg1-1). Their predators, the larvae of Oyamia gibba and Protohermes grandis, were less sensitive (48-h LC50 values,42 and >160 μg1-1, respectively)than the Ephemeroptera to fenobucarb.　LC50 values among the Ephemeroptera larvae were considered to be significantly different since their 95% confidence limits did not overlap. The larvae of Isonychia japonica and E.yoshidae were more sensitive to fertobucarb in their earlier stages (at head capsule widths of <1.0 mm and <1.6 mm, respectively). On the other hand, the larvae of E. lattfolium seemed to differ considerably in their sensitivity to a low concentration (10 μg1-1) of fenobucarb.
日本環境毒性学会の論文