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<br />59
<br />
<br />355.
<br />
<br />Hem, J. D.
<br />water.
<br />
<br />1959. Study and interpretation of the chemical characteristics of natural
<br />U. S. Geol. Surv., Water-Supply Pap. 1473. 363 pp.
<br />
<br />GEOLOGY, HYDROLOGY, POLLUTION, WATER QUALITY
<br />
<br />Interprets the chemical characteristics of natural waters as affected by the hydrology and
<br />geology of an area.
<br />
<br />356. Hepworth, D. K. 1976. Benthic fauna of recently inundated areas of Lake Powell, Utah-
<br />Arizona. Utah Div. Wildl. Resources, Publ. 76-17. 10 pp.
<br />
<br />ABUNDANCE, INVERTEBRATE, RESERVOIR, RIVER-Colorado
<br />
<br />Although the numbers of organisms never became great, colonization of newly inundated areas
<br />of Lake Powell occurred within a short time and maximum densities were reached in early
<br />August. Genera of the more commonly found chironomids peaked in abundance during July,
<br />August, and September. Changes in the density of different chironomids and occurrence of
<br />pupae in most samples indicated the emergence occurred throughout the summer and early fall.
<br />
<br />357. Hepworth, D., and S. P. Gloss. 1976. Food habits and age-growth of walleye in Lake} Nell,
<br />Utah-Arizona, with reference to introduction of thread fin shad. Utah Div. Wildl.
<br />Resources, Publ. 76-15. 13 pp.
<br />
<br />AGE-GROWTH, FISH, FOOD HABITS, RESERVOIR, RIVER-Colorado
<br />
<br />Before the introduction of shad, the diet was predominated by centrarchids. After intro-
<br />duction, walleyes fed almost exclusively on shad. A decrease in the frequency of empty
<br />stomachs and an increase'in-mean number of fish per stomach occurred after introduction
<br />of the shad." No change occurred in the volume of food that was ingested by walleyes.
<br />Growth of walleyes was similar for each year and changes in the diet did not result in any
<br />apparent change of growth.
<br />
<br />358. Hepworth, D. K., A. W. Gustaveson, and R. Biggins. 1976. Lake Powell post-impoundment
<br />investigations: annual performance report--1975. Utah State Div. Wildl. Resources,
<br />Publ. 76-21. 36 pp.
<br />
<br />AGE-GROWTH, FISH, FOOD HABITS, RECREATION, RESERVOIR, RIVER-Colorado
<br />
<br />Annual report covering a number of topics such as the measurement of sport fishing harvest,
<br />pressure, and success; index of fish population trends; and evaluation of striped bass
<br />culture, growth, and introduction into the reservoir.
<br />
<br />359. Hewston, J. G.
<br />Reservoir,
<br />
<br />1966. Development of the recreational use patterns at Flaming Gorge
<br />1963-1965. Ph.D. Thesis, Utah State Univ., Logan. 193 pp.
<br />
<br />ECONOMICS, FISHERY, MANAGEMENT, RECREATION, RESERVOIR, RIVER-Green
<br />
<br />Discusses the visitor facilities and their use at Flaming Gorge Reservoir in northeastern
<br />Utah and southwestern Wyoming.
<br />
<br />360. Hewston, J. G., and D. R. Franklin. 1969. Recreational use patterns at Flaming Gorge
<br />Reservoir, 1963-1965. U. S. Bur. Sport Fish. Wildl., Resour. Publ. 70. 80 pp.
<br />
<br />FISHERY, RECREATION, RESERVOIR, RIVER-Green
<br />
<br />Activities, characteristics, and satisfactions of recreationists at Flaming Gorge Reservoir
<br />Utah-Wyoming, were studied in 1963-1965. Data were collected from interviews, question-
<br />naires, creel censuses, and administrative agency records.
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