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3 <br />Before construction of the dam and initiation of the fish control <br />project, several individuals and groups had expressed concern over the <br />effects these two events would have on the fauna of the Green River, <br />particularly that portion in Dinosaur National Monument. As a result <br />of this concern and interest in sound resource management, several <br />investigations of the fauna and flora of the Green River were conducted <br />prior to the rotenone treatment. Bosley (1960), McDonald and Dotson <br />(1960), and Dibble ed. (1960), studied fish and invertebrates in the <br />portion of the river now impounded by the dam. Pre-impoundment studies <br />of the river fauna below the dam and in Dinosaur National Monument were <br />conducted by Hagen and Banks (1963) and Woodbury et al. (1963). A <br />study of bottom fauna conducted by Binns (1965) above Flaming Gorge Dam <br />began before impoundment and continued through 1964. <br />Following the controversy arming over the fish control project, <br />the Utah Cooperative Fishery Unit was directed by the Department of the <br />Interior to investigate the distribution and ecology of the fishes and <br />fish-food organisms below the dam. The present study is concerned with <br />the latter group, the macroinvertebrates, which form an important part <br />of the food chain for fish. The objectives of this study were to: <br />1. Determine the species composition of macroinvertebrates in <br />the Green River below Flaming Gorge Dam. <br />2. Determine the distribution and abundance of macroinverte- <br />brates in the Green River below Flaming Gorge Dam in 1964 <br />.k and 1965. <br />3. Compare the composition of the invertebrate fauna below Flam- <br />ing Gorge Dam with the fauna reported from the area prior to <br />fish eradication and impoundment.