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Theses/Dissertations

Utah

1975

Articles 1 - 6 of 6

Full-Text Articles in Life Sciences

Dispersion Of The Host Specific Phytophagous Insects Of Duncecap Larkspur (Delphinium Occidentale) In The Wasatch Mountains Of Utah, Robert L. Bayn Jr. May 1975

Dispersion Of The Host Specific Phytophagous Insects Of Duncecap Larkspur (Delphinium Occidentale) In The Wasatch Mountains Of Utah, Robert L. Bayn Jr.

All Graduate Theses and Dissertations

Populations of Delphinium occidentale (Ranunculaceae)were monitored over two summers for the presence and dispersion of various life stages of several host specific phytophagous insects. Observations were made at several sites in the Wasatch National Forest east of Logan, Utah. Two species of larkspur aphid (Aphis rociadae and Kakimia wahinkae) were encountered. Although dispersal of alate individuals resulted in widespread infestation of the host plant population, aphids occurred initially on the same one or few plants at each site both springs. Little coexistence of the two species of aphid on the same plant was observed, perhaps because they partitioned the ...


The Effects Of Gully Plugs And Contour Furrows On Erosion And Sedimentation In Cisco Basin, Utah, Dee B. Thomas May 1975

The Effects Of Gully Plugs And Contour Furrows On Erosion And Sedimentation In Cisco Basin, Utah, Dee B. Thomas

All Graduate Theses and Dissertations

Soil surface treatments consisting of gully plugs and contour furrows were constructed as a means of reducing erosion and holding sediment on site.

To measure the effectiveness of the gully plugs and furrows, angle iron stakes and profile transects were installed to measure soils loss and accompanying change in the soil profile. The profile transects gave a reliable measure of the change in the height of the soil surface in constructed pits and across contour furrows. Because of the shrinking and swelling of the soil, the change in height of the angle iron stakes was found to be much more ...


Economics Of Land Use Planning: A Case Study Of Annexation In Heber Valley, Utah, Lyle C. Summers May 1975

Economics Of Land Use Planning: A Case Study Of Annexation In Heber Valley, Utah, Lyle C. Summers

All Graduate Theses and Dissertations

Some theories and methodologies applicable to land use planning problems were reviewed along with the history of land use and land use legislation in the United States and Utah. This review served to point out that federal land use policy is moving away from the incentive approach to controlling land use and toward a more mandatory approach aimed at giving increased emphasis to environmental quality and less to economic efficiency.

A model for conceptualizing and analyzing annexation problems was developed and applied to a problem in Heber City, Wasatch County, Utah. The analysis demonstrated that annexation is feasible by showing ...


Investigation Of Factors Contributing To The Declining Range Sheep Industry In Utah, Jerry W. Boehme May 1975

Investigation Of Factors Contributing To The Declining Range Sheep Industry In Utah, Jerry W. Boehme

All Graduate Theses and Dissertations

The purpose of this paper is to document the major reasons sheep producers are liquidating their business, and to provide some insight into the present use of land and labor resources taken out of sheep production, Data compiled for the study were obtained from personnel interviews of former sheep producers statistically selected from a master list of all producers who stopped sheep production from 1968 to June 1974. The general characteristics of Utah sheep ranches were presented followed by an analysis of producers who, and the reasons why, they sold their herds, The last section of the report documents the ...


The Utah Prairie Dog: Abundance, Distribution, And Habitat Requirements, G. Donald Collier May 1975

The Utah Prairie Dog: Abundance, Distribution, And Habitat Requirements, G. Donald Collier

All Graduate Theses and Dissertations

Objectives of this study were: (1) to determine the status of the utah prairie dog (Cynomys parvidens, Allen), a rare mammal endemic to southcentral Utah, and (2) to identify habitat factors which limit densities of this species. Seven components of the habitat were studied: barriers, other animals, soil, temperature and precipitation, topography, vegetation, and water. Prior to collection of habitat data, virtually all populations of the species were found by extensive searching and interviewing; the number of animals and the area occupied were determined for each population.

Results justified the endangered status of the Utah prairie dog. Area occupied by ...


Experimental Avian Botulism Studies On Sewage Oxidation Ponds In Utah, Daniel W. Moulton May 1975

Experimental Avian Botulism Studies On Sewage Oxidation Ponds In Utah, Daniel W. Moulton

All Graduate Theses and Dissertations

The objective of this study was to field-test the "microenvironment concept" of avian botulism epizootiology. The "microenvironment concept" hypothesizes that aquatic invertebrate carcasses may serve both as a substrate for toxin production by Clostridium botulinum type C in nature and as a vehicle for toxin transmission to waterbirds. This concept has become the generally accepted, but inadequately tested, working hypothesis of type C botulism epizootiology.

This study attempted to experimentally induce type C botulism in sentinel flocks of mallard ducks (Anas platyrhynchos) and American coots (Fulica americana) on sewage oxidation ponds in northern Utah. The three experimental oxidation ponds were ...