Vertical distribution of invertebrate drift in a large river1

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Abstract
Invertebrate drift in large rivers has often been sampled at only one depth, under the assumption that drift density is equal throughout the water column. A new sampling apparatus showed that the vertical distribution of drift density for the baetid mayflies Pseudocloeon and Baetis and for the caddisflies Hydropsyche and Cheumatopsyche was not uniform.

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