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mi). Using modified Surber samples, three <br />samples were collected at each of 17 sampling <br />locations. Mean diversity and equitability (e) <br />were computed at each sampling location. Mean <br />diversity and equitability decreased immediately <br />downstream of known point-source discharges. <br />With increasing downstream distances from the <br />discharge, mean diversity, and equitability <br />gradually increased. <br />134. Ellis, M. M. 1914. Fishes of Colorado. <br />Studies University of Colorado, Boulder. <br />135 pp. <br />The book describes the fish found in Colorado <br />and provides accounts of their ecology and <br />distribution. Squawfish occur in Colorado only <br />in the Grand, White, and Yampa Rivers and their <br />tributaries. Because of its large size, it was <br />valuable as food. The humpback sucker is <br />distributed generally throughout the Colorado <br />River drainage in the large stream below the <br />foothill region. Because of their large size <br />the adult humpback suckers are often marketed <br />with the flannelmouth suckers. Xyrauchen <br />texanus was reported to the writer to be taken <br />in numbers by the Mohave Indians from the <br />Colorado River near Fort Mohave. (Wydoski) <br />DESCRIPTION <br />KEY <br />SPECIES LIST <br />FISH <br />HISTORY <br />DISTRIBUTION <br />ECOLOGY <br />COLORADO R. <br />YAMPA R. <br />WHITE R. <br />2, 3, 4 <br />135. Elser, A. A. 1968. Fish populations in a HABITAT ALT. <br />trout stream in relation to major habitat POPULATION <br />zones and channel alterations. Transactions FISH <br />American Fisheries Society 97:380-397. ABUNDANCE <br />The relationship of fish populations to major <br />habitat zones and channel alterations was <br />studied in Little Prickly Pear Creek, Montana, <br />during the summers of 1965 and 1966. Five <br />major zones were defined as follows: headwater, <br />meadow, mountain, lower meadow, and Wolf Creek <br />Canyon, with at least one representative study <br />section in each. Approximately 23 percent (6 <br />of 30 miles) of the stream has been altered. <br />Field measurements showed no pool riffle perio- <br />dicity in the altered mountain sections, while <br />successive riffles were spaced at intervals of <br />5.7 widths, in the unaltered areas. Altered <br />sections of the mountain zone consisted by <br />area, of 87 percent shallow-fast with no deep- <br />60 <br />