Aquatic insect drift through a final-cut strip mine pit, with emphasis on drift distances

摘要: Drift samples were taken upstream and at the outlet of a final-cut strip mine pit through which portion Tongue River, Wyoming, USA, was rerouted. All prominent rheophilic insect species (except cased Trichoptera) found capable drifting length (> 500 m). However, drift densities leaving reduced in comparison to those entering it. Pit inhabitants such as burrowing mayflies, Chaoborus flavicans, several Chironomidae also collected outlet. Under physical conditions created by rerouting river pit, observed maximum behavioral background distances m) significantly greater than reported past (< 100