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A simple sampler for concurrently collecting drifting as well as upstream-moving organisms is described. It is constructed of inexpensive, readily available material and can be used in high discharge and low flow lotic environments. The five-sectioned trap is designed for equal quantitative sampling of drifting and upstream-moving organisms. Collecting nets can be quickly attached or removed without disturbing the trap or substrate being sampled.
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Horton H. Hobbs (1981) studied this question.
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