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Articles 1 - 12 of 12
Full-Text Articles in Life Sciences
Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen
Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen
Theses and Dissertations
The influence of soil water repellency (WR) on vegetation recovery after a fire is poorly understood. This dissertation presents strategies to broaden opportunities for enhanced post-fire rangeland restoration and monitoring of burned piñon and juniper (P-J) woodlands by: 1) mapping the extent and severity of critical and subcritical WR, 2) determining the influence of WR on soil ecohydrologic properties and revegetation success, and 3) evaluating the suitability of a wetting agent composed of alkylpolyglycoside-ethylene oxide/propylene oxide block copolymers as a post-fire restoration tool for ameliorating the effects of soil WR and increasing seedling establishment. Results indicate that:
• Post-fire patterns …
Ecophysiological Mechanisms Underlying Aspen To Conifer Succession, William J. Calder
Ecophysiological Mechanisms Underlying Aspen To Conifer Succession, William J. Calder
Theses and Dissertations
This thesis includes three studies. The first study examined how reductions in light availability and changes in soil chemistry that occur as conifers establish in aspen stands, differentially affects the regeneration success of aspen and conifers. We found that aspen were more sensitive to changes in light and soil then subalpine fir. For aspen, reduced light and conifer influenced soils significantly reduced height, biomass, photosynthesis and the production of secondary defense compounds. Subalpine fir seedlings were significantly reduced in photosynthesis, biomass and R:S under lower light conditions but showed no differences in physiology or growth when grown on the contrasting …
Genetic Dissection Of Triterpenoid Saponin Production In Chenopodium Quinoa Using Microarray Analysis, Derrick James Reynolds
Genetic Dissection Of Triterpenoid Saponin Production In Chenopodium Quinoa Using Microarray Analysis, Derrick James Reynolds
Theses and Dissertations
Quinoa (Chenopodium quinoa Willd.) is an important food crop for subsistence farmers in the Altiplano (high plains) of Peru, Bolivia, and Argentina. Saponins are part of a diverse family of secondary metabolites that are found in high concentrations in the pericarp of many varieties of quinoa. Due to their bitter taste and anti-nutritive properties, saponins must be removed before the quinoa grain is consumed. There are ‘sweet’ varieties of quinoa that have significantly reduced levels of saponin. Previous research suggests saponin production is controlled by a single locus. The major objective of this research was to elucidate the genetic …
Predictive Modeling Of Sulfur Flower Buckwheat (Erigonum Umbellatum Torrey) Using Non-Parametric Multiplicative Regression Analysis, David B. Davis
Predictive Modeling Of Sulfur Flower Buckwheat (Erigonum Umbellatum Torrey) Using Non-Parametric Multiplicative Regression Analysis, David B. Davis
Theses and Dissertations
Impacts of humans on ecosystems in western United States have necessitated ecological restoration, which includes the development of native seed that can be used for revegetation efforts. Development of such seed sources are costly and time consuming. This study describes the use of non-parametric multiplicative regression analysis (NPMR) to develop a predictive model for occurrence of sulfur-flower buckwheat (Eriogonum umbellatum Torrey) population seed collection. This perennial forb species is of interest for seed source development in the western United States. Presence and absence data for E. umbellatum was taken from the Utah Division of Wildlife Resources Big Game Range …
Identification And Manipulation Of Resistance To Tomato Spotted Wilt Virus Derived From Solanum Peruvianum, Luis F. Gordillo Jr.
Identification And Manipulation Of Resistance To Tomato Spotted Wilt Virus Derived From Solanum Peruvianum, Luis F. Gordillo Jr.
Theses and Dissertations
The domesticated tomato Solanum lycopersicum (L.), formerly known as Lycopersicon esculentum is a genetically well-studied crop species with high-density linkage and molecular maps based on crosses done between cultivated tomato and its distant related wild species. Wild tomato species harbor a wealth of resistance to many pathogens that have been introgressed into domesticated tomato for genetic control of diseases and pests and for improvement of many agronomic traits. The wild tomato S. peruvianum (L.) is the source of the Sw-5 gene, characterized and mapped to chromosome 9 of the tomato genome and introgressed into elite tomato germplasm, providing resistance to …
Stable Carbon Isotope Evidence Of Ancient Maya Agriculture At Tikal, Guatemala, Richard Lee Burnett
Stable Carbon Isotope Evidence Of Ancient Maya Agriculture At Tikal, Guatemala, Richard Lee Burnett
Theses and Dissertations
Stable carbon isotope analyses of the humin fraction of the soil organic matter were conducted on more than 160 soil profiles from Tikal, Guatemala. The profiles were collected from near areas associated with the earthworks of Tikal; an ancient ditch and parapet construction hypothesized to have formed ancient boundaries of the polity. In addition to the isotope analyses, the physical and chemical characteristics of the horizons were determined. Maize, a C4 plant, formed an integral part of the ancient Maya diet and is the only known C4 plant cultivated by the Maya. Prior to and subsequent to the ancient Maya …
Physiological Assessment Of Chenopodium Quinoa To Salt Stress, Arturo Jason Morales
Physiological Assessment Of Chenopodium Quinoa To Salt Stress, Arturo Jason Morales
Theses and Dissertations
The physiological responses to salt stress were measured in Chenopodium quinoa. In a greenhouse experiment, salt water was applied to the quinoa varieties, Chipaya and KU-2, and to the model halophyte Thellungiella halophila to assess their relative responses to salt stress. Height and weight data from a seven-week time course demonstrated that both cultivars exhibited greater tolerance to salt than T. halophila. In a growth chamber experiment, three quinoa cultivars, Chipaya, Ollague, and CICA 17 were hydroponically grown and physiological responses were measured with four salt treatments. Tissues collected from the growth chamber treatments were used to obtain …
The Grass Seed Pathogen Pyrenophora Semeniperda As A Biocontrol Agent For Annual Brome Grasses, Thomas E. Stewart
The Grass Seed Pathogen Pyrenophora Semeniperda As A Biocontrol Agent For Annual Brome Grasses, Thomas E. Stewart
Theses and Dissertations
Bromus tectorum and other annual brome grasses have invaded many ecosystems of the western United States, and because of an annual-grass influenced alteration of the natural fire cycle on arid western range lands near monocultures are created and conditions in which the native vegetation cannot compete are established. Each year thousands of hectares become near monocultures of annual brome grasses. Pyrenophora semeniperda, a generalist seed pathogen of annual grasses, shows major potential as a possible mycoherbicide that could help in reducing the monocultures created by annual grasses. The purpose of this research was to identify the requirements for isolating …
Concentration Of Metabolites And Behavior Of Live Weight In Llamas (Lama Glama) Fed With Natural Grass And Barley During Gestation, Postpartum, And New Born Phases In Turco, Department Of Oruro, Eduardo Ticona Benique
Concentration Of Metabolites And Behavior Of Live Weight In Llamas (Lama Glama) Fed With Natural Grass And Barley During Gestation, Postpartum, And New Born Phases In Turco, Department Of Oruro, Eduardo Ticona Benique
Theses and Dissertations
The llama, a potential socioeconomic resource in the Bolivian highlands, faces serious nutritional deficiencies during the gestational and postpartum stages that negatively affect production. This study was conducted at the Tika Huta Experimental Center in the Llachu community of the Oruro prefecture. Our objectives were to determine metabolite concentration in blood plasma as well as live weight performance of pregnant and postpartum female llamas. Adult and juvenile llamas were fed diets of either plain natural grass or natural grass combined with 0.4 kg of barley hay. In addition, we determined metabolite concentrations in blood plasma and live weight performance of …
Zoometric Measures In Llamas (Lama Glama) Of Rural Families In The T'Olar And Pajonal Natural Grazing Fields Of The Municipality Santiago De Machaca - Department Of La Paz, Eloy Tuco Cano
Theses and Dissertations
Llamas have provided, and continue to provide, fiber, meat, skins, fertilizer and transport for the Andean people. In addition, they are part of the traditional and religious culture of the Aymara and the Quechua. Both are currently unaware of the productive qualities of llamas, especially those related to meat production, which is the principle product responsible for generating greater income for farmers. For this reason, 554 llamas were evaluated from a total of 3,693 in 2005. The llamas came from T’olar and Pajonal grasslands in the Santiago de Machaca region of La Paz, Bolivia and represented males and females from …
Diversity Of Insects From The Vespidae Family In Three Ecological Niches (Forest, Forest Border, And Agricultural Area) In Six Communities In The Coroico And Coripata Municipalities, Department Of La Paz, Edwin Zapata Mayta
Theses and Dissertations
The Vespidae family (order Hymenoptera) is comprised of 4500 species of wasps in 268 genera and 7 subfamilies. These wasps prey upon a wide range of insects, including Lepidopteran caterpillars. Because of their low prey specificity, the use of Vespid wasps in biological control programs is limited. However, in their natural habitat, they play a role in controlling populations of some pest species. This study was conducted in six different communities in the department of La Paz within the municipalities of Coroico and Coripata. Three ecological niches were selected in each community: 1) the forest, 2) the edge of the …
Evaluation Of The Effects Of Saka Or Suncho (Viguera Pascensis) In The Feeding Of Guinea Pigs (Cavia Aparea Porcellus) In The Community Of Sococoni, Muñecas Province, La Paz, Boris Rodriguez Peñaranda
Evaluation Of The Effects Of Saka Or Suncho (Viguera Pascensis) In The Feeding Of Guinea Pigs (Cavia Aparea Porcellus) In The Community Of Sococoni, Muñecas Province, La Paz, Boris Rodriguez Peñaranda
Theses and Dissertations
The following work was conducted in the community of Socononi, La Paz, in which we analyzed the effects of three different portions of saka or suncho (viguera pascensis) during the growth, and fattening stages in guinea pigs (cavia aparea porcellus). We used 32 mestizo guinea pigs (improved Peruvian creole breed) weaned 21 days after birth. Four treatments were administrated to the 32 animals (16 males and 16 females), the treatments were the following: (R0) or witness, consisting of corn alone, (R2) consisting of 30% of saka, (R3) consisting of 50% of saka, and (R4) consisting of 70% saka. The variables …