Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 13 of 13

Full-Text Articles in Life Sciences

Analysis Of Food Web Effects Of Non-Native Fishes And Evaluation Of Stream Restoration Potential For The San Rafael River, Utah, Timothy E. Walsworth Dec 2011

Analysis Of Food Web Effects Of Non-Native Fishes And Evaluation Of Stream Restoration Potential For The San Rafael River, Utah, Timothy E. Walsworth

All Graduate Theses and Dissertations

The highly endemic native fish fauna has experienced dramatic reductions in abundance and range because of anthropogenic activity. In addition to a highly altered flow, temperature, and physical habitat template, many non-native fish species have established populations throughout the basin. The San Rafael River, a tributary of the Green River in southeastern Utah, is home to populations of flannelmouth sucker (Catostomus latipinnis), bluehead sucker (C. discobolus), and roundtail chub (Gila robusta), and has experienced degradations representative of many rivers throughout the Colorado River Basin. Using the San Rafael River as a template, I examined (1) the effect of the non-native ...


Cougar Exploitation Levels In Utah: Implications For Demographic Structure, Metapopulation Dynamics, And Population Recover, David C. Stoner May 2004

Cougar Exploitation Levels In Utah: Implications For Demographic Structure, Metapopulation Dynamics, And Population Recover, David C. Stoner

All Graduate Theses and Dissertations

Presently, eleven western states and two Canadian provinces utilize sport hunting as the primary mechanism for managing cougar (Puma concolor) populations. However, the impacts of sustained harvest on population dynamics and demographic structure arc not well understood. Additionally, the lack of cost-effective enumeration techniques and strongly conflicting societal values complicate effective management of this species. Given these concerns, the primary goals of this study were (I) to determine the effects of sustained harvest on cougar populations, and (2) estimate the level and extent of cougar harvest statewide.

I monitored cougar populations on Monroe Mountain in south-central Utah, and in the ...


Economic Impact Of Snowmobiling In Utah, Ikuko Fujisaki May 2001

Economic Impact Of Snowmobiling In Utah, Ikuko Fujisaki

All Graduate Theses and Dissertations

The purpose of this study was to estimate statewide and local economic impact resulting from snowmobiling activities in Utah to gain a better understanding of preferences and opinions of Utah snowmobilers. The results will provide valuable information for snowmobiling management.

The survey instrument was designed to describe trip behavior, snowmobiling-related trip and annual expenditures, level of satisfaction with Utah snowmobiling opportunities, and demographics. A telephone survey was conducted with randomly selected households with registered snowmobiles during the period from April to June 2000. A 54.5% response rate yielded 373 usable completed questionnaires for data analysis.

For economic impact analysis ...


Litter Decomposition And Nutrient Release Patterns In A Subalpine Forest In Northern Utah, Amber Denton Johnson May 1997

Litter Decomposition And Nutrient Release Patterns In A Subalpine Forest In Northern Utah, Amber Denton Johnson

Undergraduate Honors Capstone Projects

In the arid subalpine zone of the intermountain west it is common to see patchy forests interspersed with open meadows containing scattered clusters of trees referred to as tree islands. These tree islands are often composed of subalpine fir [Abies lasiocarpa (Hook) Nutt.] and Englemann spruce [Picea englemannii (Parry)]. In desert ecosystems, where lack of water is the most important factor limiting growth and nutrient dynamics, it is not unusual to see individual plants (especially in the shrub community) creating "islands of fertility", in which the plants collect nutrients by pumping them from deeper in the soil profile and redepositing ...


Fire Occurrence, Behavior And The Effect Of Fire On Deer Mouse Density In Oakbrush At Camp Williams National Guard Base, Utah, Joel E. Godfrey May 1995

Fire Occurrence, Behavior And The Effect Of Fire On Deer Mouse Density In Oakbrush At Camp Williams National Guard Base, Utah, Joel E. Godfrey

All Graduate Theses and Dissertations

Fire occurrence and behavior were determined by collecting and analyzing fuel , weather , and fire history ii data. Fuel plots were used to measure average fuel loading by vegetation type and integrated with weather to make worst - case fire behavior prediction s . A fire history was developed using oakbrush (Quercus qaffibelli Nutt . ) sprouts to determine age and the Global Positioning System (GPS) for mapping the burned areas . Average fuel loading was highest in the oakbrush fuel type with 16.8 t/ha , then juniper (Juniperus ost eosoerma Torrey ) with 6 . 72 t/ha , and the lowest was in sagebrush (Artemisia triden ...


Hazard Perception And Preparation By Cross-Country Skiers In Utah, Kevin J. Kobe May 1991

Hazard Perception And Preparation By Cross-Country Skiers In Utah, Kevin J. Kobe

All Graduate Theses and Dissertations

This thesis examined how cross-country skiers perceive and prepare for winter hazards. A self-completion questionnaire was administered to cross-country skiers in northern Utah. The questions on the questionnaire were designed to explore the relationships that affect how skiers perceive and prepare for winter hazards. Additionally, the situation where skiers put themselves at risk due to lack of information as opposed to skiers placing themselves at risk through the desire to confront nature's dangers was explored. Variables that were contained in these relationships were correlated and the degree of correlation was measured.

Those that sought information on the day surveyed ...


A Description Of Anglers And Angling Use In Two Areas Of The Uinta Mountains, John F. Hoagland May 1973

A Description Of Anglers And Angling Use In Two Areas Of The Uinta Mountains, John F. Hoagland

All Graduate Theses and Dissertations

The High Uinta Primitive Area, Utah's most popular high mountain recreation area, has a reputation as an excellent trout and grayling fishery. Proposed for inclusion in the National Wilderness Preservation System, the area faces several management dilemmas. The primary problem being that managers must protect the resource from the effects of heavy recreational use without destroying the primitive and aesthetic dimensions of wilderness environment. It appears that much impact on the more accessible lakes is due to fishing use. The objectives of the study were: (1) to determine the proportions of angling to non-angling groups; (2) to describe certain ...


A Study Of Root Biomass In An Engeimann Spruce-Subalpine Fir Stand In Northern Utah, Larry O. Gadt May 1970

A Study Of Root Biomass In An Engeimann Spruce-Subalpine Fir Stand In Northern Utah, Larry O. Gadt

All Graduate Theses and Dissertations

Biomass of roots in the top 6 inches of soil profile was measured . This weight was then used in a stepwise multiple regression to test correlations between root biomass and above ground merisurational parameters.

Total biomass of all roots was 9822 ± 2810 pounds per acre oven dry. Spruce roots weighed 4417 ± 997 pounds per acre; of this spruce roots less than 0.125 inch diameter weighed 2023 ± 347 pounds per acre and biomass of spruce roots greater than 0.125 inch diameter was 2394 ± 8S3 pounds per acre. Total fir roots weighed Sl56 ± 2687 pounds per acre; of this roots ...


Analysis Of Long-Term Streamflow Patterns On Two Davis County Experimental Watersheds In Utah, Stephen P. Glasser May 1969

Analysis Of Long-Term Streamflow Patterns On Two Davis County Experimental Watersheds In Utah, Stephen P. Glasser

All Graduate Theses and Dissertations

The influence of aspect on water yield variability over a long period, 1936-1964, was studied at two small, mountainous watersheds within the Davis County Experimental Watershed near Farmington, Utah.

North-facing Miller Creek is densely vegetated by a conifer-aspen forest and mountain brush. Miller Creek's yield was more variable for daily, monthly, seasonal, and annual flows than yields from south-west facing Halfway Creek which is covered by mountain brush. Differences between watersheds in annual yield and snowmelt season runoff were nonsignificant.

The snowmelt runoff season extended for an average of 65 days on both watersheds, but it began 24 days ...


Seasonal, Diurnal And Species Variation In Forage Moisture Content In Relation To Site On Mountain Summer Range Of Northern Utah, Chaudhry Mohammad Sharif May 1967

Seasonal, Diurnal And Species Variation In Forage Moisture Content In Relation To Site On Mountain Summer Range Of Northern Utah, Chaudhry Mohammad Sharif

All Graduate Theses and Dissertations

Practical assessments of range production and utilization are based on forage weight estimates. In preparing these estimates moisture content in green vegetation offers some problems. The moisture component is not likely to be constant for a given species. Diurnal, seasonal and site variability have been well illustrated for agronomic and tree species (Salisbury, 1848; Jenkins, 1879; Miller, 1917; Pearson, 1924; Watkins, 1940; Parker, 1951; Ackley, 1954; Werner, 1954; Zohary and Orshan, 1956; Slatyer, 1959; Kozlowaki, 1965 and Jame son, 1966). Since variability is also likely for range plants, computations made on green weights are apt to be fallacious. It is ...


Existing And Potential Outdoor Recreation Resources In Bear Lake Valley, Utah And Idaho, Dennis H. Black May 1965

Existing And Potential Outdoor Recreation Resources In Bear Lake Valley, Utah And Idaho, Dennis H. Black

All Graduate Theses and Dissertations

Providing adequate outdoor recreational opportunities to the public is now a national problem. Of the many influences affecting the demand for recreation, increased income, population increase, sociological changes, and rapidly increasing technological developments are the more important. In the face of these factors, we must plan better to insure sufficient future needs. This will require evaluation and development of many recreation opportunities.

The Bear Lake are of northeastern Utah and southeastern Idaho is situated along U.S. 89 and within close driving distance of much of Utah's population. Up to the present there has been little orderly or planned ...


The Effect Of Range Condition Upon The Production, Nutritive Intake And Digestibility Of Desert Range Forage In Southwest Utah, J. Kent Taylor May 1962

The Effect Of Range Condition Upon The Production, Nutritive Intake And Digestibility Of Desert Range Forage In Southwest Utah, J. Kent Taylor

All Graduate Theses and Dissertations

The 65 million acres of winter range in the Intermountain region furnish forage for about five million sheep and four million cattle each winter for approximately six months. These arid ranges are well suited for winter grazing, and are of paramount importance to the livestock industry. Many of these ranges were fully stocked by 1900 and as livestock continued to increase, many winter ranges were seriously over-grazed (Hutchings and Stewart, 1953). Today many of these ranges remain in a deteriorated condition. Forage production has decreased and desirable plants have been replaced by less desirable species.

Little is known about the ...


A Management Study Of The Cache Elk Herd, Norman V. Hancock May 1955

A Management Study Of The Cache Elk Herd, Norman V. Hancock

All Graduate Theses and Dissertations

American elk, by virtue of their distributio.n, were the most cosmopolitan members of the cervid family at the time of white settlement of North America. At this early date elk were present in every major region of what is now continental United States, as well as in northern Mexico. They likewise were abundant in upper and lower Canada, though records do not corroborate their presence too far north on the Atlantic coast. Although generally existent throughout the western states, elk were sparsely distributed in Nevada, southern Utah, and most of Arizona and New Mexico. Paucity of elk was also ...