Abstract
The density of midge larvae (Chironomidae), which dominate the stone-surface fauna (81.3 ± 4.9% of the community by number) in an upland stream in northeast England is regulated by the amount of particulate material available. The amount of material depends on the deposition of suspended particles and on epilithic algal growth. Spates, characteristic of this type of stream, result in scouring and denudation of rock surfaces, preventing the build-up of epilithic material and limiting larval densities by regulating the availability of food and tube-building material. Detritus is the main type of particle in suspension throughout the year (66 ± 6%); detritus and diatoms the chief epilithic kind (65 ± 4 and 29 ± 4% respectively). The probable effects of flow amelioration, resulting from the formation of the proposed Kielder Reservoir are discussed.
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