Abstract
Benthic communities in outdoor experimental streams were exposed to 1 and 10 mg 1 −1 of diflubenzuron and the same concentrations of methoprene for 30 min, respectively. The effects of these chemicals were assessed daily by examining drifting pupal exuviae over a period of one month following the treatment. Neither chemical induced the drift of macrobenthos at the time of application. However, diflubenzuron affected the emergence of all species examined. A high larval mortality of a species of chironomid was observed directly in the stream treated with diflubenzuron, where mayfly nymphs and caddisfly larvae were also decreased. However, in the stream treated with methoprene, no marked mortality of benthos could be observed, but chironomids and caddisflies disappeared. Methoprene treatment not only affected the emergence of the mayfly, Baetis sahoensis, but caused its outbreak.
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