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In: Proceedings Federal Interagency Sedimentation Conference, 1963. U. S. Department of Agriculture, Miscellaneous Publications No. 970. pp. 72-84. This paper deals with ecological factors and land uses that influence sediment yields. Such land uses as logging and road construction, grazing, and recreation are considered. Ecologi- cal factors considered include vegetation, geological parent material and soils, slope, precipitation, and fire. GRAZING GEOLOGY 107. Cook, E. P. 1952. A survey of parasites of FISH warm-water fish from northeastern Colorado SURVEY reservoirs. M.S. thesis, Colorado Agricul- RESERVOIR ture & Mechanics College, Fort Collins. INVERTEBRATES 117 pp. ~ DISEASE This thesis was concerned with examining four reservoirs in northeastern Colorado for parasites on the fish population. The parasites were then preserved and classified. (Wydoski) 108. Cope, 0. B. 1956. Some migration patterns in cutthroat trout. Proceedings Utah Academy of Sciences, Arts, and Letters 33:113-118. Migrating cutthroat trout spawners (Salmo clarki lewisi) in Arnica Creek, Yellowstone National Park, were counted day and night in 1951. Five sixths of the total count for the season entered the stream between 6 p.m. and 7- 8 a.m. This nocturnal migration is unusual for salmonid spawners, and is explained by the response of spawners to evening freshets that occur during the season of melting snows. Lakeward-migrating cutthroat fry in the same stream were counted, and it was found that 88 percent of the total count from August 1 to 15 moved downstream at night. Nocturnal movements of fry have been observed in other trouts and in salmon, and have been attributed to a negative phototropism. 109. Cope, 0. B. 1957. The choice of spawning sites by cutthroat trout. Proceedings MOVEMENTS MIGRATION SPAWNING SPORT FISH. 5 DISTRIBUTION SPAWNING 50