Ecotoxicological effects of abamectin (MK-936) on natural populations of selected invertebrates in man-made ponds

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  • ALI Arshad
    University of Florida, IFAS, Central Florida Research and Education Center
  • XUE Rui De
    University of Florida, IFAS, Central Florida Research and Education Center
  • ALAM Shawn K.
    Lake Restoration Section, Florida Game and Fresh Water Fish Commission

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Other Title
  • 人工池における無脊椎動物の自然個体群に対する abamectin (MK-936) の生態毒物学的効果
  • Ecotoxicological effects of abamectin M

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Effects of abamectin on invertebrate populations in man-made ponds in central Florida were studied. A 0.15 EC formulation of abamectin (AVID^[○!R] was applied at rates of 5.7,11.3,22.7,45.4,and 90.7g AI/ha. Each rate was applied to 3 ponds and 3 untreated ponds were maintained as controls. Pretreatment and periodic posttreatment quantitative samples of zooplankton, and benthic and free-swimming invertebrates in each pond were collected. In the laboratory, all samples were examined, invertebrates identified and counted. The pre-, and posttreatment population data for each invertebrate group were statistically analyzed to determine any significant (P=0.05) reductions due to treatments. Immature insects (Baetis sp., Coleoptera larvae and nymphal Hemiptera) were adversely affected but recovered at 14 days posttreatment in all treated ponds; adult Coleoptera and Hemiptera were not affected. Gastropoda were slightly affected at 2 days posttreatment only at 90.7g AI/ha of abamectin. Chironomid larvae were significantly reduced at all treatment rates for up to 14 days posttreatment. Cladocera (>95% Moina spp.) were reduced to varying degrees at all treatment rates, recovering between 14-53 days posttreatment, depending upon the rate of treatment. Nauplius and adult Copepoda (90% Cyclops spp.) were reduced >99% within 2-7 days posttreatment at 22.7,45.4,and 90.7g AI/ha. They completely recovered between 14-53 days posttreatment in all treated ponds. Ostracods were probably affected adversely by the highest 3 rates of abamectin. Rotifera were not affected in any treated pond. Abamectin caused temporary population reductions of a wide variety of aquatic invertebrates.

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