Macroinvertebrate Response to Flow Manipulation in the Strawberry River, Utah (U.S.A.)
The effects of flow regulation on stream communities immediately below reservoirs have been reported by several authors (Radford and Hartland-Rowe, 1971; Trotsky and Gregory, 1974; Ward, 1976a; Gore, 1977). Ward (1976a) reviewed the effects of reduced flow below dams on the physical and biological characteristics of streams. Attempts to provide criteria for recommending adequate stream flows have resulted in several survey methods using physical stream parameters, such as width, depth and velocity, pool-to-riffle ratio, and wetted perimeter (Stalnaker and Arnett, 1976). Recommended flows have also been based on a percentage of the historical stream flow (Tennant, 1975) or “adequate” water coverage for aquatic insect production and fish spawning (Hooper, 1973; Gore, 1978). Recommended minimum flows do not, however, take into account the long-term implications of altering the natural flow regime of a lotic system.
KeywordsMacroinvertebrate Community Hyporheic Zone Instream Flow Natural Flow Regime Invertebrate Drift
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