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52 <br />• increased flow and deep water releases override increased warming due <br />to channel morphology. <br />o The effects of discharge and temperature on activities of the rare fishes are <br />hard to isolate due to the high degree of interrelatedness between these two <br />variables. <br />Archer et al. (1986) cautioned that cause-effect relationships regarding <br />these closely related variables are difficult to establish, and suggested a <br />need for further study of such relationships. <br />Velo i <br />o Velocity along with depth and substrate are covered in the habitat section of <br />• the physical overview chapter as they are the major components of habitat <br />simulation models discussed there. <br />Ve etation <br />o Riparian vegetation increases under controlled flow conditions where peak <br />flows are moderated and yearly fluctuation is decreased. <br />Carlson and Muth (1989) reported dam regulation to lead to an overall <br />increase in riparian vegetation in the Colorado River Basin. <br />U.S. Department of the Interior (1987b) reported that riparian vegetation <br />can be scoured away by occasional flood releases below dams such as <br />occurred throughout the Lower Colorado River Basin in 1983. <br />0