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F <br />and longitudinal differences in numbers of species and faunal <br />i associations. Ames (1978) found less conclusive evidence for such <br />trends in studies of upper portions of the Yampa and White Rivers <br />in Colorado. Pearson (1967) found significant differences in <br />8 <br />community structure of aquatic microinvertebrates through a 75 mile <br />study area below Flaming Gorge Dam. Studies such as these have failed <br />to consider the dynamics of macroinvertebrate functional groups in <br />response to changing organic energy forms which occur through a <br />river system. <br />Although some investigations have been made of high order <br />1 streams (Kowalczewski and Lack 1971, Talling and Rzoska 1967, Berner <br />1951, and others) relatively few transcend taxonomic inventories of <br />biological communities. In the semi-arid western United States, <br />little information exists regarding stream ecosystem characteristics <br />and dynamics. Investigations by Watts (personal communication), <br />Minshall (1978), and Johnson et al. (1975) have con.ttibuted to this <br />understanding. <br />0 <br /> <br />0