草甘膦、乙草胺对日本三角涡虫摄食与再生的影响

研究了草甘膦和乙草胺对日本三角涡虫的急性毒性及其摄食与再生的影响.结果表明，草甘膦和乙草胺对日本三角涡虫的24和48 h LC₅₀分别为41.78和12.22 mg·L^-1、35.48和8.41 mg·L^-1.≥6.20 mg·L^-1的草甘膦和≥1.00 mg·L^-1的乙草胺对涡虫的再生影响显著（P<0.05），且其影响均随处理时间的延长而逐渐减小；术后84 h，除1.40和2.00 mg·L^-1乙草胺处理外，其余浓度乙草胺和各浓度草甘膦处理的涡虫均完成再生.表明乙草胺对日本三角涡虫的急性毒性及其摄食与再生的影响均大于草甘膦.表明日本三角涡虫可作为监测草甘膦和乙草胺污染的指示生物.

Impact of glyphosate and acetochlor on Dugesia japonica ingestion and regeneration.

In this paper, the acute toxicity of glyphosate and acetochlor on Dugesia japonica and the impact of these two chemicals on the ingestion and regeneration of D. japonica were studied. The results showed that the 24 h and 48 h LC₅₀ of glyphosate and acetochlor on D. japonica was 41.78 and 12.22 mg·L^-1, and 35.48 and 8.41 mg·L^-1, respectively. Glyphosate at the concentration of >6.20 mg·L^-1 and acetochlor at the concentration >1.0 mg·L^-1 impact the regeneration of D. japonica（P<0.05）significantly, but the impact decreased gradually with exposure time. If taking 84 hours after operation as a standard, D. japonica could regenerate well in glyphosate and acetochlor solutions at most of test concentrations except at 1.40 mg·L^-1 and 2.00 mg·L^-1 of acetochlor. It was indicated that comparing with glyphosate, acetochlor had stronger acute toxicity and stronger impact on D. japonica and its ingestion and regeneration, and D. japonica could be used as a bio-indicator to monitor glyphosate and acetochlor contamination.