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EXECUTIVE SUMMARY <br />In the Colorado and Gunnison rivers, riffle and run habitats were sampled for physical and <br />biological parameters during pre- and post-runofftime periods during 1994 and 1995. Within <br />the Colorado River, eleven separate strata were sampled. One stratum was sampled in the <br />Gunnison River. Significant temporal and spatial differences in physical and biological <br />parameters were found between sample periods and stratum for the Colorado River. The data <br />indicated that substrate parameters were the most interrelated factors in determining primary <br />and secondary producer biomass in run and riffle habitats. Furthermore, it was found that run <br />habitats contain the majority of surface area expressed as a percent of total wetted area and <br />that substrate conditions in runs may determine the overall productivity of the river. This <br />investigation represents a valuable first step toward determining the carrying capacity of the <br />Colorado pikeminnow in the upper Colorado and lower Gunnison rivers. <br />lx