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Articles 1 - 10 of 10
Full-Text Articles in Life Sciences
The Effect Of Insect Damage On Indian Ricegrass (Oryzopsis Hymenoides) In Western Utah, Luis S. Guerra
The Effect Of Insect Damage On Indian Ricegrass (Oryzopsis Hymenoides) In Western Utah, Luis S. Guerra
Theses and Dissertations
Indian ricegrass at the Desert Range Experiment Station forty-seven miles west of Milford, Utah, is damaged by the larvae of Coenchroa illibella, Diatrae sp. and Typoceris ceraticornis, the latter being the most destructive. The biology of the insects and the extent of damage inflicted are discussed. Uninfested plants produced more new stems than infested plants. Plants having a basal diameter of 4 to 6.9 cm and 7 to 9.9 cm were the most frequently infested and, consequently, the most severely damaged.
A Study Of The Phylogenetic Relationships Of Agropyron Scribneri, Agropyron Trachycaulum, And Sitanion Hystrix, C. Lorenzo Pope
A Study Of The Phylogenetic Relationships Of Agropyron Scribneri, Agropyron Trachycaulum, And Sitanion Hystrix, C. Lorenzo Pope
Theses and Dissertations
Agropyron scribneri Vasey (spreading wheatgrass) is endemic to the Rocky Mountains of the Intermountain West. Each distinct population is widely separeated by valley and desert floors. It is morphologically similar to the hybrid between Agropyron trachycaulum (Link) Malte and Sitanion hystrix between Agropyron trachycaulum (Link) Malte and Sitanion hystrix (Nutt.) J. G. Smith as well as the hybrid, A. trachycaulum x A. scribneri. It appears that A. scribneri may have originated de novo from hybidization products of A. trachycaulum and S. hystrix. Agropyron scribneri appears to be morphologically similar to the population of S. hysterix with which it is associated. …
A Quantitative And Ecological Survey Of The Algae Of Huntington Canyon, Utah, Lorin E. Squires
A Quantitative And Ecological Survey Of The Algae Of Huntington Canyon, Utah, Lorin E. Squires
Theses and Dissertations
A quantitative and ecological study of the algal flora of Huntington Canyon, Emery Co., Utah was conducted from March 1971 to April 1972. Data were collected concerning net plankton, nannoplankton, periphyton and visible attached algae. Certain physical and chemical parameters in the waters of Huntington Creek and a small pond along its course also were measured. The algal flora of Huntington Canyon contains a wide diversity of genera and species. Diatoms are the main constituent of the flora of this stream throughout the year. Hydrurus foetidus is prevalent in the creek in Huntington Canyon from late winter to early summer, …
Water Stress As A Factor Effecting Ribulose-1, 5-Diphosphate Carboxlyase Activity, Chlorophyll, And Protein Concentration In Barley And Tomato, Edwin W. Austin
Water Stress As A Factor Effecting Ribulose-1, 5-Diphosphate Carboxlyase Activity, Chlorophyll, And Protein Concentration In Barley And Tomato, Edwin W. Austin
Theses and Dissertations
Turgid, water stressed, and recovered leaf tissue from barley (var. Barbless) and tomato (var. VF 36 ) were analyzed for total chlorophyll, soluble protein, RuDPCase concentration, and RuDPCase specific activity. Water stress caused a reduction in all physiological characteristics measured. The reduction in concentration of chlorophyll, soluble protein and RuDPCase specific activity in both plants paralleled decreased water potential during first wilt. Changes associated with barley plants as compared to tomato first wilt plants were more pronounced. Barley lost 25% more water than tomato. Repeated wilt cycles increased sensitivity of tomato plants to reduction in chlorophyll content, soluble protein concentration, …
A Revision Of The Genus Sphaeralcea (Malvaceae) For The State Of Utah, Jane Ardis Murray Jefferies
A Revision Of The Genus Sphaeralcea (Malvaceae) For The State Of Utah, Jane Ardis Murray Jefferies
Theses and Dissertations
It is the attempt of the present writer to present a concise picture of the genus Sphaeralcea as it occurs in the state. Descriptions, a specific key, distribution maps, illustrations and pertinent synonomy are presented.
A Genetic Study Of Gigas Atriplex Canescens, James Michael Melby
A Genetic Study Of Gigas Atriplex Canescens, James Michael Melby
Theses and Dissertations
A population of Atriplex canescens (Pursh) Nutt. (fourwing saltbush), endemic to the Little Sahara Sand Dunes near Jericho, Utah, appears to be genetically distinct from all other forms of this species. It differs from other populations by many characters, including growth rate, seed size, and height (Figures 1, 2, 3 and 4). This is a report of a study which was made to investigate the differences between the sand dune and normal populations, and an attempt to determine the evolutionary processes involved in the formation of the sand dune population.
Vegetation Changes Following Fire In The Pinyon-Juniper Type Of West Central Utah, Milo Arnel Barney
Vegetation Changes Following Fire In The Pinyon-Juniper Type Of West Central Utah, Milo Arnel Barney
Theses and Dissertations
A total of 28 burn areas, that varied in age from 3-100+- years, were analyzed in a study of succession following fire, in the pin yon-juniper woodlands of west central Utah. Data were collected by means of the line-point and quadrat methods. These data were subjected to a multiple regression analysis. Canopy cover, basal area (sq. ft./acre) and density (trees/acre) of juniper were highly correlated with age of burn. Percentage dead sagebrush was found to be positively correlated with density of junipers. The stages of succession following fire began with weedy annuals, that reached a peak within 3-4 years. Juniper …
A Revision Of The Phacelia Crenulatae Group (Hydrophyllaceae) For North America, N. Duane Atwood
A Revision Of The Phacelia Crenulatae Group (Hydrophyllaceae) For North America, N. Duane Atwood
Theses and Dissertations
This study is a taxonomic monograph of the Phacelia Crenulatae group for North America and recognizes thirty-three species and six varieties. A brief discussion of the history, general morphology, phylogeny and cytology is given. All entities are separated by a comprehensive key, followed by a list of types, synonyms, descriptions and general habitat. Distribution maps and illustrations are included. The body of this work is based on herbarium specimens and extensive field observations and collections made throughout much of western North America. These studies have resulted in the description of five new species and several nomenclatural changes.
Three New Species Of Petrified Wood From The Upper Jurassic Morrison Formation Of Southern Utah, David Arthur Medlyn
Three New Species Of Petrified Wood From The Upper Jurassic Morrison Formation Of Southern Utah, David Arthur Medlyn
Theses and Dissertations
The petrified wood for this study was collected from the Upper Jurassic Morrison Formation in the south central part of Utah on the Colorado Plateau. The study area, located near Clay Point, Garfield County, Utah, is south of the Henry Mountains. The site is relatively undisturbed containing many well preserved specimens. This study constitutes the first detailed study of fossil coniferous woods of the Morrison Formation. Although this formation contains abundant petrified wood, its floral composition has been virtually unknown. Three genera have been identified in this study: Protopiceoxylon Gothan, Mesembrioxylon Seward, and Taxaceoxylon (Unger) Krausel. Protopiceoxylon has only been …
A Common Garden Study Of North American Chokecherries, R. Max Butler
A Common Garden Study Of North American Chokecherries, R. Max Butler
Theses and Dissertations
Three species or varieties of chokecherry reportedly grow in North America. Data were collected to determine if the varieties could be distinguished by morphological characteristics of the seedling. Seeds, collected from 20 locations in North America, were grown in a greenhouse where gross environmental factors could be controlled. For two growing seasons, data were collected on (1) height, (2) leaf thickness, (3) rate of root growth, (4) number of teeth, (5) number of leaves, and (6) the ratio of leaf length to width. The resulting data were subjected to analysis of variance and group means, and correlation studies. For the …