Life Sciences Commons^™

Plant Succession Studies On Subalpine Acid Mine Spoils In The Beartooth Mountains, Patricia Lea Howard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Large areas within alpine and subalpine tundra have been by disturbed by mining during this century. The most promising method for retarding deterioration of these areas is revegetation with native species through both seeding and transplants. One natural process of revegetation which occurs on portions of many existing disturbances seems to be the establishment of a few species that expand with time to form matts of plants.

At the McLaren Mine, located at 3000 m elevation in the Beartooth Mountains, Montana, active succession is occurring and is dominated by Carex species. Seed viability and successional patterns studies were conducted on …

Leaf Development Of Rumex Patientia L. Exposed To Uv Irradiation (280-320 Nm), Judith G. Dickson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Two factors which affect leaf ontogeny and ultimate leaf size: (1) the rate and duration of cell expansion, and (2) the rate and duration of cell division, were examined for their role in the slowed early growth rate and smaller ultimate leaf size when plants are exposed to ultraviolet-B (UV-B) radiation. Rumex patientia L. was grown in controlled environment chambers under enhanced UV-B radiation (equivalent to daily solar UV-B irradiation at 40°N latitude in mid-May with an atmospheric ozone concentration of 0.20 atm-cm) and control treatments. The pattern of growth as expressed in changes of mean cell size of two …

The Contribution Of Federal Land Grazing In The Eleven Western States To Total U.S. Beef Supply, Muhammad Rafiq

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The objectives of this study were to: 1) determine the contribution of federal land grazing to beef production in Utah and the 11 western states, and 2) trace the impact of hypothetical incremental reductions in federal land grazing in the 11 western states on total beef supply and retail beef prices in the United States.

The federal land animal units in the 11 western states were obtained from Bureau of Land Management and Forest Service records. The animal units were converted into the number of breeding cows and feeder calves totally dependent on federal land grazing, with the help of …

Influence Of Spring Sheep Grazing On The Forage Intake And Quality Of Diets Consumed By Pen-Reared Mule Deer Under Winter-Range Conditions, Kenneth Owen Fulgham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined the nutritional responses of mule deer during winter on range subjected to a system of spring livestock grazing. The specific purposes were 1) to determine the quality (crude protein, digestible energy, and digestibility) of diets consumed by mule deer in winter on ranges grazed and ungrazed by sheep in spring, 2) to determine the level of forage intake, as determined by the external indicator chromic oxide, for deer under the same grazing regimes, 3) to compare forage intake estimates determined by the external indicator (chromic oxide) with results obtained by ocular estimation, and 4) to determine the …

Conflict In Outdoor Recreation, Gerald R. Jacob

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The causes of conflict among users of outdoor recreation resources have received little attention from recreation researchers. Knowledge of factors responsible for conflict might assist recreation planners' attempts to reduce future instances of conflict and help management focus its conflict resolution efforts. A theory of conflict is offered as the first step in systematically procuring such knowledge. A definition and characteristics of outdoor recreation conflicts are presented; four comprehensive causes of user conflicts are proposed. Ten propositions are used to link these factors to conflict and suggest future research hypotheses. The social psychological dynamics of conflict, as described here, have …

Physiological Response To Hooking Stress In Largemouth Bass (Micropterus Salmoides), A. Wayne Gustaveson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Recent concern about large initial and delayed mortalities resulting from tournament angling for largemouth bass has indicated that it would be desirable to further evaluate the fate of fish that are released after being captured by angling. This study was designed to evaluate sublethal physiological disruptions caused by hooking stress after largemouth bass were played under standardized conditions (0-5 minutes) and to estimate the time needed for recovery of the homeostatic mechanisms (to 72 hours). Blood lactate was used as a measure of metabolic fatigue; plasma osmolality and chloride measurements were used to evaluate osmoregulatory disturbances and gill ion-exchange; and …

Population Dynamics And Net Production Of Brown Trout (Salmo Trutta) In Two Areas Of A High Gradient Mountain Stream, Jeffrey C. Gosse

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Estimates of the brown trout (Salmo trutta) population were made in two areas of the Blacksmith Fork River, Cache County, Utah, from June 1972 to June 1973. Additional data were obtained on movement, growth, mortality, biomass, production, and yield.

Population density was highly variable in the area where habitat alterations had occurred, but was relatively uniform where the habitat was undisturbed. The brown trout exhibited little movement except during spawning season. Instantaneous growth and mortality rates are provided for each age group.

Mean annual biomass in the two areas was 12.0 and 10.2 grams per square meter and …

The Role Of Vegetation Architecture In Determining Spider Community Organization, Cynthia L. Hatley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The relationships between vegetation architecture and spider community attributes were examined in a big sage (Artemisia tridentata) community. Spiders were separated into guilds using similarities of species' hunting behavior. Shrub architecture was experimentally manipulated in the field by either clipping 50% of a shrub's foliage to decrease foliage density or tying together a shrub's branches to increase foliage density.

Temporal patterns of spider species density, diversity (H') and evenness (J') showed midsummer peaks in both 1974 and 1975. Seasonal spider guild trends reflected the temporal prominence of a member species or genus. These temporally abundant species appeared to …

The Effect Of Various Environmental Factors On The Growth Of A Red Pigmented Dunaliella Species From The Great Salt Lake, Sam Oeun May

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A red, obligately halophilic Dunaliella species believed to be D. salina was isolated from the North Arm of the Great Salt Lake, Utah, and its optimum growth conditions were determined.

The red pigmented Dunaliella species required an optimum NaCl concentration of 10%, temperature 28°C, and an illuminance of 7500 lux. Ammonium carbonate was preferred over potassium nitrate and ammonium chloride. Potassium nitrate was preferred over ammonium chloride. The average division (generation) time under the above conditions was 46.5 hours.

The alga grown in ammonium carbonate showed a lower content of chlorophyll a compared to those grown in potassium nitrate and …

Reduced Recruitment In Utah Mule Deer Relative To Winter Condition, Phillip J. Zwank

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Reduced recruitment rates in Utah mule deer (Odocoilus hemionus) showed that significant losses in production were accruing during pregnancy, the neonatal period or during the first few months after birth. The primary objectives of the study were to determine the time, extent and possible causes of these losses.

Corpora luteal and fetal rates were estimated by examining the reproductive tracts of 125 carcasses collected on selected herd units in Utah and by observing the reproductive tracts of 136 female deer captured in Spanish Fork Canyon. A laparotomy was performed on each captured female to allow visual examination of the reproductive …

The Parasitic Groups Of Halictidae (Hymenoptera, Apoidea), Charles D. Michener

Mi

No abstract provided.

Proceedings From The 15th Annual Marschall Invitational Italian Cheese Seminar 1977, Various Authors

Cheese Industry Conference

No abstract provided.

The Application Of Ecosym Vegetation Classification To Rangelands Near Price, Utah, Don Shute, Neil E. West

Memorandum

No abstract provided.

Alternatives For Ecosystem Classification And Their Use In Developing Rangeland Inventory And Management Planning Approaches, Neil E. West

Memorandum

No abstract provided.

Desert Biome Aquatic Program: A Literature Search For Biological And Physical Parameters For Use In Estimation Of Zooplankton Production, J. Anne Holman

Memorandum

No abstract provided.

Effect Of Cold Storage On Development Of Suckers On Aspen Root Cuttings, George A. Schier, R.B. Campbell

Aspen Bibliography

The effect of cold storage on suckering ability of excised roots was determined for 10 aspen clones. Root cuttings were collected in June, August, and October and stored for from 7 to 42 days at 2°C. In addition, cuttings from dormant trees were stored for 175 days to determine if they had cold requirements for suckering. Among clones, there were large differences in capacity to produce root suckers. Cold storage had a small but significant effect on the formation and growth of suckers on root cuttings collected in June and August. As a rule, clones responded similarly to cold storage. …

Aspen Sucker Production And Growth From Outplanted Root Cuttings, Donald A. Perala

Aspen Bibliography

Aspen suckers from 1-m-long root cuttings survived and grew better than those from 12.5-cm-long cuttings. Sucker survival and growth were also inversely related to parent root diameter. Discusses the practical implications for aspen management.

Environmental And Successional Relations Of Aspen Communities In Central And Northern Utah, Jan A. Henderson

Aspen Bibliography

Aspen (Populus tremuloides) is a major forest cover type in central and northern Utah. It comprises about 35% of the forest dominated land in this area. It is mostly non-commercial timberland, but has moderately high values for watershed protection, range and wildlife values.

Determining Potential Wildlife Benefits From Wildfire In Arizona Ponderosa Pine Forests, Philip O. Lowe, Peter F. Ffolliott, John H. Dieterich, David R. Patton

Aspen Bibliography

No abstract provided.

A Firm Stand For The Quaking Aspen, Robert F. Jones

Aspen Bibliography

No abstract provided.

Assessment Of Regeneration Stocking Standards Used In Alberta: A Follow-Up, I. E. Bella, J. P. Defranceschi

Aspen Bibliography

No abstract provided.

Characterizing The Growth Dynamics Of Lake States Aspen, Thomas Edward Burk

Aspen Bibliography

No abstract provided.

Root Suckering In Young Aspen, Girdled, Defoliated, And Decapitated At Various Seasons, George A. Schier

Aspen Bibliography

No abstract provided.

Variation In Suckering Capacity Among And Within Lateral Roots Of An Aspen Clone, George A. Schier

Aspen Bibliography

No abstract provided.

Our Western Aspen Ecosystem: Quest For Management, Norbert V. Debyle

Aspen Bibliography

No abstract provided.

Some Harvest Options And Their Consequences For The Aspen, Birch And Associated Conifer Forest Types Of The Lake States, L.F. Ohmann, H.O. Batzer, R.R. Buech, D.C. Lothner, D.A. Perala, A.L. Schipper, Jr, E.S. Verry

Aspen Bibliography

No abstract provided.

Converting Partially-Stocked Aspen Stands To Fully-Stocked Stands In The Lake States: An Economic Analysis, J.T. Olson, A.L. Lundgren

Aspen Bibliography

The 1968 Wisconsin Forest Survey (Spencer and Thorne 1972) shows large areas of aspen type¹ that are not fully stocked.

Two-Year Performance Of Barerooted And Containerized Trembling And Bigtooth Aspen Seedlings, O.A. Okafo, J.W. Hanover

Aspen Bibliography

No abstract provided.

Changes In Aspen Parkland Habitats Bordering Alberta Sloughs, G. Merriam

Aspen Bibliography

No abstract provided.

Estimating Aspen Crown Fuels In Northeastern Minnesota, R.M. Loomis, P.J. Roussopoulos

Aspen Bibliography

No abstract provided.