Digital Commons Network^™

Carbon Emissions Embodied In International Trade And Carbon Sequestration Of Harvested Wood Products, Prativa Shrestha

Theses and Dissertations

After timber harvesting, carbon in wood is transferred to products pool and remains entrapped for a considerable time. It is necessary to estimate this carbon flux in the harvested wood products (HWP); otherwise, carbon emission estimates of a country will be overestimated at the time of harvest. Furthermore, carbon estimates of the HWP must be assessed for uncertainties which need to be reduced as far as possible. Environmental implications might be associated with the HWP traded in the national and international markets. In the current context, there is a lack of economic-environmental studies that relate to the trade of HWP. …

What, Why, And How Much?: The Integration Of Culture In The Secondary Foreign Language Classroom, Danielle Patricia Asay

Theses and Dissertations

Culture is an integral part of the FL classroom, yet teachers often face difficulties when incorporating it into their curricula. This survey study gathered data from teachers of many different languages, including ASL, all at the secondary level in the state of Utah. The study attempts to describe how secondary FL teachers view the role of culture in language teaching. It also details which models, means, or methods teachers use to communicate culture to their students, as well as the amount of culture included in their lesson planning, instruction, and assessment. Factors that contribute to more culture inclusion in the …

Addressing Questions Of Prehistoric Occupation Seasonality At Freshwater Mussel Shell Ring Sites In The Mississippi Delta: Applications In Carbonate Geochemistry And Zooarchaeology, Joseph Alan Mitchell

Theses and Dissertations

Seasonality estimates based on archaeological shellfish remains have been an important component of settlement pattern reconstruction. Investigations of this nature allow researchers to place prehistoric people on the landscape at points in space at different times of the year. Many of the previous seasonality studies, however, have focused on marine species from coastal sites, with little attention given to freshwater locales, especially ones in the Mississippi Delta. To address that disparity, this study examines freshwater mussel “season of capture” via analysis of stable oxygen isotope ratios in specimens recovered from two Late Woodland sites located along the Yazoo River, Mississippi. …

Contest Or Congruence: The Effects Of Work/School Conflict And Facilitation On Working College Students, Madeline Mareen Miscenich

Theses and Dissertations

The purpose of this study was to find out more about working students perspectives on work/school conflict and facilitation. The subjects that participated in the study included students workers of Rowan University employed through the Federal Work Study (FWS) Program in the area of Gloucester County, New Jersey. Data from the subjects were gathered using a quantitative survey design, with items presented in a Likert scale format. The data were analyzed using SPSS Software, and frequency of response, measures of central tendency, and Pearson correlations were examined in order to determine student attitudes regarding work/school conflict and facilitation. Subjects were …

A Comparison Of Direct Instruction And Experiential Learning Techniques To Assess Agricultural Knowledge And Agricultural Literacy Gains In Private School Students, Timothy Bradford Jr.

Theses and Dissertations

The United States has shifted from a once agrarian, to a predominantly urban society (Riedel, 2006). Currently, less than 2% of the U.S. population live on farms. Coupled with urbanization, this has contributed to the decline of an agriculturally literate population (EPA, 2013; Kovar & Ball, 2013). One strategy to alter the public’s perception of agriculture and increase agricultural literacy is implementing an educational environment that promotes agricultural activities via experience (Blair, 2009). Experiential learning has been championed by prominent educational theorists John Dewey and David Kolb. Experiential learning is conceptualized as a process where relevant experiences are the foundation …

International Policy Experience: Short-Term International Travel Courses In Structured Degree Programs, Kirk Marshall Clayton

Theses and Dissertations

This descriptive quantitative research examined 7 years of data to find what are the benefits, challenges, and outcomes of short-term international travel courses in a structured degree program in the organizational leadership, doctoral program at Pepperdine University Graduate School of Education and Psychology from 2007 to 2014. While there is currently a plethora of study abroad research, most of the existing research explores semester or academic-year programs. Very few studies have investigated shorter durations or students’ perceptions and experiences during these programs or their experiences with, self-identified encounters during these courses. This study aimed to alleviate the dearth of information. …

Ecocomposition As Writing Curriculum: An Ecological Approach For Writing Program Administrators And Composition Instructors, Erin Renee Lord Kunz

Theses and Dissertations

This dissertation forwards an argument for an ecologically-based composition and rhetoric curriculum that also emphasizes the best practices established by the Council of Writing Program Administration, particularly the writing process. I concentrate on how a writing program administrator can utilize ecological literacy to navigate her own experience in a new place and also how themes of ecological literacy can be applied to the writing program itself. Based on personal experiences as well as literature that establishes the need for best practices in composition and rhetoric curriculum, I argue that ecological composition, or ecocomposition, can assist in implementing an ecological writing …

The Effects Of Tidal Forcing On Nutrient Fluxes In The Tidal, Freshwater James River Estuary, Va, Dana L. Devore

Theses and Dissertations

A 12-month study (January to December 2015) focused on the effects of tidal forcing on nutrient fluxes in the tidal, freshwater segment of the James River Estuary (JRE). Discrete sampling of nutrient chemistry and continuous monitoring of tidal discharge were used to determine the volume and timing of the tides, and differences in nutrient concentrations between incoming and outgoing tides. The goal of this study was to improve understanding of tidal influence on nutrient fluxes and their role in nutrient transport to the lower estuary. Results suggested that differences in nutrient concentrations between incoming and outgoing tides were small throughout …

Valuing Natural Space And Landscape Fragmentation In Richmond, Va, Lee Wyatt Carpenter

Theses and Dissertations

Hedonic pricing methods and GIS (Geographic Information Systems) were used to evaluate relationships between sale price of single family homes and landscape fragmentation and natural land cover. Spatial regression analyses found that sale prices increase as landscapes become less fragmented and the amount of natural land cover around a home increases. The projected growth in population and employment in the Richmond, Virginia region and subsequent increases in land development and landscape fragmentation presents a challenge to sustaining intact healthy ecosystems in the Richmond region. Spatial regression analyses helped illuminate how land cover patterns influence sale prices and landscape patterns that …

Genome Wide Epigenetic Analyses Of Araptus Attenuatus, A Bark Beetle, Chitra Seshadri

Theses and Dissertations

Phylogeographic studies have relied on surveying neutral genetic variation in natural populations as a way of gaining better insights into the evolutionary processes shaping present day population demography. Recent emphasis on understanding putative adaptive variation have brought to light the role of epigenetic variation in influencing phenotypes and the mechanisms underlying local adaptation. While much is known about how methylation acts at specific loci to influence known phenotypes, there is little information on the spatial genetic structure of genome-wide patterns of methylation and the extent to which it can extend our understanding of both neutral and putatively adaptive processes. This …

Seasonal Variation Of Fish And Macroinvertebrate Biomass Spectra In Southern West Virginia Streams, Andrew J. Kirk

Theses and Dissertations

The biomass size spectrum - the power-law scaling relationship between average individual size and total biomass - has often been studied in lake and marine ecosystems, but rarely in lotic systems. The objective of this study was to test for characteristic biomass spectra in small temperate streams. Seasonal fish and macroinvertebrate data, including population abundance and biomass estimates, were collected in three wadeable, southern West Virginia streams from October 2013 to May 2015. Fish abundances were estimated with 3-pass electrofishing (depletion) surveys and individuals were weighed in the field. Macroinvertebrates were collected with a Hess sampler and returned to the …

Upper Thermal Limits Differ Among Component Species In A Host-Parasitoid-Hyperparasitoid System, Kanchan A. Joshi

Theses and Dissertations

Among the predicted impacts associated with global climate change, warming is of special interest because the rates of physiological processes are temperature-dependent. Insects and other ectotherms are likely to be affected due to their limited ability to control body temperature. In this study, I measured the tolerance to extreme high temperatures, i.e., critical thermal maximum (CT_max), of component species in a tri-trophic system, including an herbivore (Manduca sexta), a primary larval parasitoid (Cotesia congregata) and a hyperparasitoid (genus Silochalcis). For wild insects, the parasitoid had the lowest CT_max, the hyperparasitoid had …

Plant Functional Trait And Hyperspectral Reflectance Responses To Comp B Exposure: Efficacy Of Plants As Landmine Detectors, Paul V. Manley Ii

Theses and Dissertations

At least 110 million landmines have been planted since the 1970s in about 70 nations, many of which remain in place today. Some risk of detection may be mitigated using currently available remote sensing techniques when vegetation is present. My study focused on using plants as phytosensors to detect buried explosives. I exposed three species representing different functional types (Cyperus esculentus (sedge), Ulmus alata (tree), Vitis labrusca (vine)) to 500 mg kg^-1 of Composition B (Comp B; 60/40 mixture of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and 2,4,6-trinitrotoluene (TNT)), a commonly used explosive mixture, and measured functional traits and reflectance over …

Multivariate Analysis And Geographic Modeling Of Archaeological Landscapes, J. Christopher Gillam

Theses and Dissertations

Advances in Geographic Information Science (GISci), archaeological databases and statistics enable the development and refinement of spatial applications of multivariate statistics and other quantitative methods for modeling ancient and historical cultural landscapes. Along the Central Savannah River of South Carolina, this research on prehistoric and historic site distributions, their environmental, temporal and cultural context, and geographic modeling explored methodologies for predicting site locations and modeling cultural landscapes to gain a better understanding of the distant and recent past. Methods for testing extant models, detecting changes in land-use through time, and for developing time-sliced and adaptation-based landscape models were demonstrated using …

Hydrological Drought Analysis For Seven North Georgia Watersheds (1970-2000), Jessica L. Taylor

Theses and Dissertations

Drought is a prolonged reduction in precipitation which may result in significant effects on local ecosystems, watersheds, and water sources, with the potential to have negative impacts on human populations. Normalized indexes can be used to characterize drought magnitudes and frequencies using historical data records on temperature, rainfall, snowpack, soil moisture, streamflow, and/or other water supply indicators. This study examined the applicability of two drought indices: Standardized Precipitation Index (SPI) and Streamflow Drought Index (SDI). The SPI and SDI estimate the magnitude of observed rainfall (SPI) and discharge (SDI) deviations from the long-term average.

In this study, SPI and SDI …

Selecting Spatial Scale Of Area-Level Covariates In Regression Models, Lauren Grant

Theses and Dissertations

Studies have found that the level of association between an area-level covariate and an outcome can vary depending on the spatial scale (SS) of a particular covariate. However, covariates used in regression models are customarily modeled at the same spatial unit. In this dissertation, we developed four SS model selection algorithms that select the best spatial scale for each area-level covariate. The SS forward stepwise, SS incremental forward stagewise, SS least angle regression (LARS), and SS lasso algorithms allow for the selection of different area-level covariates at different spatial scales, while constraining each covariate to enter at most one spatial …

Dimension Reduction And Variable Selection, Hossein Moradi Rekabdarkolaee

Theses and Dissertations

High-dimensional data are becoming increasingly available as data collection technology advances. Over the last decade, significant developments have been taking place in high-dimensional data analysis, driven primarily by a wide range of applications in many fields such as genomics, signal processing, and environmental studies. Statistical techniques such as dimension reduction and variable selection play important roles in high dimensional data analysis. Sufficient dimension reduction provides a way to find the reduced space of the original space without a parametric model. This method has been widely applied in many scientific fields such as genetics, brain imaging analysis, econometrics, environmental sciences, etc. …

Influence Of Historic Landscapes And Contemporary Species Management On Chesapeake Bay Bald Eagles And Osprey, Catherine B. Viverette

Theses and Dissertations

Influence of historic landscapes and contemporary species management on Chesapeake Bay Bald Eagles and Osprey

Catherine B. Viverette

Co-distributed species with well documented demographic histories can provide good models for testing alternative hypotheses about the impact of evolutionary history, contemporary landscapes, and species management on current distribution and population structure. The Osprey (Pandion haliaetus) and Bald Eagle (Haliaeetus leucocephalus) have been extensively studied, managed and monitored across their North American breeding range, particularly in the Chesapeake Bay. We used a combination of ecological niche modelling, diet reconstruction, and population genetic modeling to understand the role of …

Comparison Of Novel Carboneous Structures To Treat Nitroaromatic Impacted Water, Benjamin M. Doane

Theses and Dissertations

Carboneous materials such as carbon nanotube (CNT), granular activated carbon (GAC), and biochar are promising materials for the removal of organic contaminants from aqueous phase solutions. CNTs have astonishing mechanical strength, chemical and thermal stability and high surface area. While biochar, similar to GAC, having an extremely porous structure and high surface area, can be produced in more austere conditions with native materials. In this study, novel CNT-Hybrid structures (CNT-HS), hardwood pellet (HWP) Biochar and standard GAC (F-600 GAC) were used as adsorbents to treat water contaminated by a model nitroaromatic compound, 2,4-dinitrotoluene (DNT).

Women Workin’ It In Gis: A Mixed Methods Study Of Underrepresentation And The Gendered Experience Among Female Gis Practitioners, Livia M. Betancourt Mazur

Theses and Dissertations

Through novel empirical research, this thesis explores the experience of women working in the professional field of geographic information systems (GIS), adding to GIS literature, as well as to academic geography and wider science, technology, engineering and mathematics (STEM) discourses, addressing gaps in these bodies of knowledge.

Estimating Stormwater Runoff For Community Gardens In New York City, Mara Gittleman

Theses and Dissertations

While much of the literature cites community gardens as providing urban ecosystem services, there is very little research quantifying these benefits. This thesis compares the stormwater runoff rates of urban vacant lots, community gardens, and residential developments in New York City and evaluates community gardens as green infrastructure.

An Assessment Of Environmental Sustainability Guidelines At Community And Junior College Campuses In Mississippi, Suzanne Davis Strehle

Theses and Dissertations

The purpose of this study was to review the established sustainability guidelines in place at each of the 15 public community and junior colleges in Mississippi and to illuminate the ways in which these community colleges interacted with environmental sustainability during the 2013-2014 academic year. Dimensions studied within the established guidelines included curriculum, research and scholarship, operations, faculty and staff development, outreach and service, student opportunities, and administration, mission, and planning. This research study was qualitative in nature and utilized a multiple case holistic design. Sustainability guideline documents, informant commentary, college policy documents, and college course catalogs were gathered from …

The Effects Of Hydropeaking On Lotic Benthic Macroinvertebrate Assemblages, Andrew L. Garey

Theses and Dissertations

The term hydropeaking refers to anthropogenically induced, short-duration, high-magnitude discharge pulses that are generated in lotic systems for electricity production. The practice of hydropeaking produces the largest source of renewable energy worldwide, and its use is projected to increase through the year 2040. The primary objective of this work was to evaluate the effects of hydropeaking on benthic macroinvertebrate assemblages, which are important components of lotic ecosystems. Results of this work show that, across a wide range of impacted systems worldwide, the consistently observed patterns of elevated benthic macroinvertebrate drift in response to hydropeaking pulses are primarily related to the …

Dissolved And Particulate Phosphorus Distributions And Elemental Stoichiometry Throughout The Chukchi Sea, Meryssa Piper

Theses and Dissertations

As the only gateway of material, particularly nutrients, from the Pacific to the Arctic Ocean, the biological and chemical transformations that occur within the Chukchi Sea are critical for understanding Arctic ecosystems. This study examines the biogeochemical cycling of the macronutrient phosphorus (P) relative to carbon and nitrogen in the eastern Chukchi Sea during the ICESCAPE’s mission. Sea ice and water column dissolved and particulate phosphorus samples were collected during two summer expeditions in 2010 (n=593) and 2011 (n=989). Despite being a landlocked marginal sea, the P pool present within the Chukchi Sea was substantially modified by biological processes with …

Dispersal: A Multidisciplinary Investigation Of Plant Life, Alexandra E. Arzt

Theses and Dissertations

Using plants as a basis for exploring the interstices between the human and nonhuman, this thesis investigates ideas of awareness, intelligence, deep time, animism, and the fluctuating human perception of the agency of Nature. It outlines environmental art practices since the 1950s involving vegetal life. In addition, the paper provides a critical analysis of plant perception of Jakob von Uexküll’s work and theories of vital materialism and “critical plant studies” while noting recent studies in plant neurobiology. In my work, plants become active participants via their movement, seeding, and smell. This study takes the form of imitation, purposeful symbiosis, anthropomorphism, …

Emergent Non-Consumptive Predator Effects Alter Habitat Colonization By Dipteran Prey, Ethan G. Staats

Theses and Dissertations

When ovipositing, prey organisms avoid habitat patches containing predator cues because predators consume, and negatively affect the fitness of their prey. Richness of predator species often enhances the strength of consumptive predator effects, but little is known about how multiple predators combined affect prey non-consumptively. We quantified dipteran colonization in aquatic mesocosms in response to varied predator richness. Multiple predator species combined reduced oviposition by Culex mosquitoes, chironomid midges, and the general colonizing dipteran community more than predicted by the effects of the independent predator species. Previous research which quantifies effects of multiple predators on prey as prey abundance, but …

Effects Of Constant Vs. Fluctuating Temperatures On Performance And Life History Of The Herbivorous Pest Lymantria Dispar (Lepidoptera: Eribidae), Brendan E. Sostak

Theses and Dissertations

The role of temperature variation in organismal performance is understudied, but is critically important for understanding the response of biodiversity to climate change. To address this issue in herbivorous insects, I studied the direct and interactive effects of thermal regime (constant vs. fluctuating temperatures) and nutrition (dietary nitrogen) on gypsy moth (Lymantria dispar) performance under laboratory conditions. Predictions for differences between constant and fluctuating thermal conditions were derived from Jensen’s inequality, and artificial diets of differing nutritional quality were made by modifying nitrogen (casein) content. Larvae were reared in the laboratory under four temperature regimes (22°C constant, 22°C …

Expanding Eco-Visualization: Sculpting Corn Production, Jennifer E. Figg

Theses and Dissertations

This dissertation expands upon the definition of eco-visualization artwork. EV was originally defined in 2006 by Tiffany Holmes as a way to display the real time consumption statistics of key environmental resources for the goal of promoting ecological literacy. I assert that the final forms of EV artworks are not necessarily dependent on technology, and can differ in terms of media used, in that they can be sculptural, video-based, or static two-dimensional forms that communicate interpreted environmental information. There are two main categories of EV: one that is predominantly screen-based and another that employs a variety of modes of representation …

Proof-Of-Concept Of Environmental Dna Tools For Atlantic Sturgeon Management, Jameson Hinkle

Theses and Dissertations

Abstract

The Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus, Mitchell) is an anadromous species that spawns in tidal freshwater rivers from Canada to Florida. Overfishing, river sedimentation and alteration of the river bottom have decreased Atlantic Sturgeon populations, and NOAA lists the species as endangered. Ecologists sometimes find it difficult to locate individuals of a species that is rare, endangered or invasive. The need for methods less invasive that can create more resolution of cryptic species presence is necessary. Environmental DNA (eDNA) is a non-invasive means of detecting rare, endangered, or invasive species by isolating nuclear or mitochondrial DNA (mtDNA) from the …

Long-Term Effects Of Land Cover Change On Fish Assemblage Structure In The Piedmont And Coastal Plain Regions Of Virginia, Samuel F. Stickley

Theses and Dissertations

Changes in land cover and fish assemblage structure were assessed across two spatial and temporal scales in the Piedmont and Coastal Plain regions of the Chesapeake Bay watershed in Virginia. A long-term, local study (1953 to 2014) on the Tuckahoe Creek watershed used digitized aerial photography and satellite images (Landsat 5 TM and Landsat 8 OLI/TIRS) to quantify land cover change for five nested catchments in 1953, 1990, and 2014. Instream fish collections from 1958, 1990, and 2014 were utilized to assess a variety of fish assemblage metrics for each of the five catchments, and analyses were performed to assess …