Natural running water wadis are important for ecological conditions of many organisms. Dams are built across a running water valley for multiple-purpose, therefore natural running water system is divided to three different habitats; wadi, reservoir and spillway. In order to understand the effects of dam construction on the Chironomidae dispersion, Chironomid fauna of three habitats, Sejenane wadi and its branches that flow into the reservoir, newly formed Sejenane Reservoir and spillway were investigated and compared. Even though 10 species were determined from the wadi, only two species from the reservoir and three species from the spillway were found.
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