Digital Commons Network^™

Oceanic Primary Production Trend Patterns Along Coast Of Ecuador, Nicole Chinacalle-Martínez, Elka García-Rada, Jean López-Macías, Silvia Pinoargote, Gema Loor, Javier Zevallos-Rosado, Pedro Cruz, David Pablo, Belén Andrade, Carlos Robalino-Mejía, Stephanie Añazco, Jéssica Guerrero, Andrea Intriago, Callie Veelenturf, César Peñaherrera-Palma

Neotropical Biodiversity

Primary productivity (PP) is a vital oceanographic process generated by photoautotrophic organisms that transform inorganic carbon into organic macronutrients and micronutrients via photosynthesis. While in situ studies have shed light onto the spatial and seasonal variations of chlorophyll a (Chl a) concentration, and thus PP, in specific study sites, there are no comprehensive monitoring programs to assess its long-term variation nor its seasonal patterns in broader areas of coastal Ecuador. The main objective of the present study is to evaluate changes in Chl a concentration along the coast of Ecuador and examine how these changes correspond to changes in Sea …

Projecting The Theoretical Niche Of A Recently Re-Discovered Population Of Feral Asian Water Buffalo (Bubalus Bubalis) In The North Rupununi Wetlands, Guyana, Matthew T. Hallett, Gerard Pereira, Oswin Ambrose, Diane Mcturk, Brittany A. Bankovich

Neotropical Biodiversity

We provide documentation of a population of feral domestic Asian water buffalo (Bubalus bubalis) that has persisted in the wetlands of the North Rupununi Region of Guyana for more than 75 years. Historical records indicate that water buffalo were incidentally introduced to the Rupununi by the colonial administration of British Guiana. Personal observations, camera trap photos, and reports of opportunistic encounters populate our maximum-entropy model, which projects a total of 2,489 km2 of suitable water buffalo habitat across the region, including 1,076 km2 of the RAMSAR-nominated North Rupununi wetlands (~11% of total land area). Key informants indicate that populations appear …

Prevalence And Exacerbation Of Asthma Within Two Counties In Eastern Kentucky, Rachid Souleye

Theses and Dissertations--Public Health (M.P.H. & Dr.P.H.)

Background: Central Appalachia residents have one of the highest rates of serious respiratory diseases in the nation. Appalachian Kentuckians are 50% more likely to be diagnosed with adult asthma compared to the overall U.S. population. Yet, few epidemiologic studies have assessed risk factors for respiratory disease in this population. Using a community-based approach, the investigators of the Mountain Air Project (MAP), one of the largest adult cohorts from two disadvantaged communities in Central Kentucky, collected data to estimate the prevalence of asthma and assess various socioeconomic and environmental risk factors to determine their effect on asthma.

Methods: A cross-sectional epidemiologic …

Patterns Of Dispersion, Movement And Feeding Of The Sea Urchin Lytechinus Variegatus, And The Potential Implications For Grazing Impact On Live Seagrass, Adrianna Parson, Joseph M. Dirnberger, Troy Mutchler

Gulf and Caribbean Research

The sea urchin Lytechinus variegatus is a known grazer of both living and dead tissue of turtlegrass, Thalassia testudinum, occasionally denuding large areas of seagrass. Field studies have attempted to assess effects of herbivory on seagrass by enclosing urchins at various densities. However, it is unclear how unrestricted urchins affect seagrass at lower densities more typically observed in the field. This study describes movement, feeding, and distribution of L. variegatus within beds of T. testudinum in St. Joseph Bay, Florida (USA) to quantify this urchin’s impact as a seagrass grazer. Urchins were absent from portions of seagrass beds closest to …

Connecting Youth To Nature: Environmental Education’S Role In The Future Of Wellbeing And Stewardship, Claire Generous

Pomona Senior Theses

In 2005, the term Nature-deficit disorder was coined by Richard Louv to describe the childhood costs of alienation from nature including diminished use of the senses, attention difficulties, and higher rates of physical and emotional illnesses. The increasing use of technology, stricter parenting, local ordinances, biophobia, socioeconomic status, and coronavirus all contribute to Nature-deficit disorder. To mitigate and reverse Nature-deficit disorder and its consequences, children must connect with nature. Nature connection improves children’s health and wellbeing and increases environmentally responsible behavior. Nature connection can improve physical, spiritual, psychological, and social wellbeing. Children who spend more time in nature report lower …

Cover And Contents

Turkish Journal of Botany

No abstract provided.

Environmental Respiratory Exposures And Pulmonary Function Among Residents Of Rural Appalachia, Kentucky, John C. Flunker

Theses and Dissertations--Epidemiology and Biostatistics

Introduction

Resource extraction exposures are hypothesized to promote adverse respiratory health outcomes among residents of rural Appalachia, yet no studies to date have simultaneously quantified small-scale geographic variation in residential exposure, individual level health factors, and respiratory health outcomes.

Methods

The Mountain Air Project (MAP) is a community engaged cross-sectional study based in Harlan and Letcher counties of Southeastern Kentucky. MAP utilized a novel small-scale method to define residential exposure boundaries: hydrologic unit code (HUC), which represents distinct drainages (AKA “hollows”) where residents cluster. We assigned the HUC level density of active and abandoned surface and underground mining, oil/gas wells, …

Equine West Nile Virus In Kentucky: Characteristics Of Historical Testing And Analysis Of Causal Factors, Kaelyn Short

Theses and Dissertations--Public Health (M.P.H. & Dr.P.H.)

As the arbovirus with the highest incidence in both humans and horses in the United States, West Nile Virus (WNV) presents a significant risk to the equine population of Kentucky. Widespread infection has the potential to cause a significant economic impact to the state and long-term health complications for the horses. To better understand the burden of equine WNV, historical diagnostic testing archives the University of Kentucky Veterinary Diagnostic Lab were analyzed along with environmental and census data collected from additional sources. A total of 2146 test results were analyzed utilizing descriptive statistics, chi-square tests of independence, and binary logistic …

Applications Of Machine Learning In Microbial Forensics, Ryan B. Ghannam

Dissertations, Master's Theses and Master's Reports

Microbial ecosystems are complex, with hundreds of members interacting with each other and the environment. The intricate and hidden behaviors underlying these interactions make research questions challenging – but can be better understood through machine learning. However, most machine learning that is used in microbiome work is a black box form of investigation, where accurate predictions can be made, but the inner logic behind what is driving prediction is hidden behind nontransparent layers of complexity.

Accordingly, the goal of this dissertation is to provide an interpretable and in-depth machine learning approach to investigate microbial biogeography and to use micro-organisms as …

The Association Between Experiencing Police Arrest And Suicide Ideation Among Emerging Young Adults: Does Race Matter?, Manik Ahuja, Kathie Records, Angela M. Haeny, Eleni M. Gavares, Hadii M. Mamudu

ETSU Faculty Works

The objective of the study was to examine the association between lifetime arrest and marijuana-related first arrest with past-year suicide ideation among Black and White people. We used data from Wave-IV (2008–2009; N = 5114) of the publicly available National Adolescent Health Study (Add Health) data. A total of 4313 Non-Hispanic Black and White participants were selected for this study. Logistic regression was used to assess whether lifetime arrest and marijuana-related arrests were associated with past year suicide. Overall, 28.8% of the sample reported lifetime arrest, 6.3% reported lifetime suicide ideation, and 3.7% reported marijuana-related arrest. A significantly higher percentage …

The Impacts Of External Patient Variables On Gene Expression Profiles Of Lung Adenocarcinomas, Michael Madsen

CMC Senior Theses

The search for improvements to detection and treatment of cancers is a paramount goal for all of medicine. The most important step for oncological research is to expand the knowledge base of the genetic characteristics and abnormalities that give rise to cancer. In our present day, one of the most pressing and deadly forms of cancer is that of the lung, with lung adenocarcinomas being the most prevalent variation of the disease. Improving our cancer genomic insight can provide the seedings for improved cancer detection, novel cancer treatment, and serve as a guide for avenues to explore with future oncological …

The Reintroduction Of A Sustainable And Nutritious Food Source: The American Chestnut, Eva Scott

Renée Crown University Honors Thesis Projects - All

No abstract provided.

Phenotypic Plasticity In Acropora Pulchra Under Varied Environmental Conditions, Dennis A. Conetta

Open Access Master's Theses

The extent to which coral reefs have declined globally has triggered major scientific investment in coral restoration research. However, much of the predictions for reef futures do not include the capacity for coral acclimatization, or phenotypic plasticity, and how this plasticity varies across seasons. In light of this, we outlplanted clonal replicates of distinct genotypes of the reef building coral Acropora pulchra from an existing coral nursery common garden site to three sites on the North Shore of Mo’orea, French Polynesia. After transplantation (October 2019), the outplanted colonies were sampled at all three sites in January and November of 2020, …

Development Of Environmental Metabarcoding Analysis For Use In Ecological Studies Of Aquatic Fungal And Oomycete Communities Using Nanopore Sequencing, Douglas Bennett

All Master's Theses

One of several factors contributing to amphibian decline are organisms called water molds (oomycetes), which parasitize and kill amphibian and fish eggs, larvae, and occasionally adults. Amphibian decline is one of the most difficult issues facing ecologists and conservationists to date; half of amphibian species are in severe decline and one third of amphibian species are facing extinction, threatening the stability of ecosystems globally. Multiple oomycete species are known to cause the disease saprolegniasis and contribute to amphibian decline; however, the full range of species involved is not presently known. This study evaluated the Oxford Nanopore minION DNA sequencer (R9.2 …

Evidence On The Effectiveness Of Small Unmanned Aircraft Systems (Suas) As A Survey Tool For North American Terrestrial, Vertebrate Animals: A Systematic Map Protocol, Jared A. Elmore, Michael F. Curran, Kristine O. Evans, Sathishkumar Samiappan, Meilun Zhou, Morgan B. Pfeiffer, Bradley F. Blackwell, Raymond B. Iglay

United States Department of Agriculture Wildlife Services: Staff Publications

Background: Small unmanned aircraft systems (sUAS) are replacing or supplementing manned aircraft and groundbased surveys in many animal monitoring situations due to better coverage at finer spatial and temporal resolutions, access, cost, bias, impacts, safety, efficiency, and logistical benefits. Various sUAS models and sensors are available with varying features and usefulness depending on survey goals. However, justification for selection of sUAS and sensors are not typically offered in published literature and existing reviews do not adequately cover past and current sUAS applications for animal monitoring nor their associated sUAS model and sensor technologies, taxonomic and geographic scope, flight conditions and …

Ecohydrology Of Epiphytes: Modelling Water Balance, Cam Photosynthesis, And Their Climate Impacts, Gretta Miller, Samantha Hartzell, Amilcare Porporato

Civil and Environmental Engineering Faculty Publications and Presentations

Epiphytes are aerial plants, often characterized by CAM (crassulacean acid metabolism) photosynthesis, which make up a significant portion of the biomass in some rainforests. Their unique characteristics have not yet been included in ecohydrological models, and their potential impact on local hydrometeorology is largely unexplored. This work introduces a water balance model for epiphytes, which adapts the soil‐plant‐atmosphere continuum model to represent a plant system without soil and couples it to the Photo3 photosynthesis model, which includes CAM photosynthesis. The model, which is parameterized with field data of Guzmania monostachia, accurately captures the observed hydraulic and photosynthetic behaviour of …

Restoring Heterogeneity-Based Management To Rangelands For The Benefit Of Grassland Birds And Floral Resources, Cameron Albert Duquette

Range Science

Worldwide grassland loss necessitates careful consideration of management practices occurring on those grasslands that remain. Concerns with overgrazing in the early twentieth century led to overcorrection via uniform, moderate stocking. While these practices reversed some forms of rangeland degradation, they also suppressed variability in vegetation structure that is characteristic of native systems. Reduced heterogeneity resulted in biodiversity declines across many trophic levels. In an effort to restore heterogeneity, we reinstated the historic processes of fire and ungulate grazing. We studied the impacts to grassland birds and floral resources, as the Northern Plains are valuable landscapes for breeding grassland birds and …

Highest Composition Dissimilarity Among Phytoplankton Communities At Intermediate Environmental Distances Across High-Altitude Tropical Lakes, Alonso Cartuche, Kalina M. Manoylov, Bastiaan W. Ibelings, Patrick Venail

Faculty and Staff Works

Tropical high-altitude lakes are vital freshwater ecosystems for the functioning and dynamics of tropical high-altitude wetlands called páramos, found at over 3300 m above sea level. They play a major role in the hydrogeological cycle and provide important hydrological services such as water storage, and yet they are understudied. Describing the patterns and processes of community composition in these lakes is required to better understand the consequences of their degradation by human activities. In this study we tested the geographical and environmental components of distance–decay relationships in the phytoplankton structure across 24 tropical high-altitude lakes from Southern Ecuador. Phytoplankton composition …

North American Freshwater Snails As Paleoecologic Proxies In Crystal Lake, Medway, Ohio, Jaclyn R. Manker

Browse all Theses and Dissertations

This study combines various paleoecological proxies found within a sediment core extracted from Crystal Lake, Medway, Ohio in order to assess the lake’s sensitivity to past climate changes and how that may have affected lake water levels. Crystal Lake is a natural kettle lake formed at the end of the Wisconsin glaciation. It is now surrounded by approximately 500 residential homes and is privately owned by the HOA of Crystal Lake. A sediment core was extracted from Crystal Lake in 2007 and has been carbon dated to 18000 years before present, indicating that it contains a complete sedimentary history from …

Long-Term Changes In Juvenile Green Turtle Abundance And Foraging Ecology In The Indian River Lagoon, Florida, Christopher Long

Electronic Theses and Dissertations, 2020-2023

Marine turtles are distributed in temperate, sub-tropical and tropical waters and beaches worldwide, often in areas heavily impacted by humans. Although there are many threats to marine turtle populations, the growing threats of nutrient pollution and harmful algal blooms are relatively understudied despite their widespread impacts on coastal marine ecosystems that marine turtles depend on. By studying juvenile green turtles (Chelonia mydas) in the Indian River Lagoon, Florida, where nutrient pollution and HABs are a widespread and longstanding issue, I aimed to conduct a case study of how these threats may affect this federally Threatened species. In Chapter 2, I …

Litter Breakdown And Benthic Invertebrate Detritivores From A Hydrologically Restored Stream, Jacob Becraft

Online Theses and Dissertations

The breakdown of coarse forms of detritus into finer forms is an ecosystem function of forested headwater streams. Many factors influence the rate of litter decay, but there is a lack of research on how stream restorations, that aim to restore hydrologic functions, influence litter breakdown. This study compared litter processing rates and macroinvertebrate detritivore assemblages between a hydrologically restored stream (Slabcamp Creek) and an un-restored control stream (White Pine Branch) in the Daniel Boone National Forest in Rowan Co., KY. Red maple (Acer rubrum) leaves were placed in mesh bags and deployed in riffles and pools at the restored …

Radon Removal Using A Venturi Injector-Based Household Aeration System, Jordan Meaney

Master's Theses and Capstones

Radon-222 is a naturally occurring radioactive noble gas that is colorless, tasteless, and odorless and has been a known carcinogenic since the early 1920’s. Radon in groundwater can lead to inhalation of radon through off gassing caused by water-use processes such as showering, flushing toilets, and washing machines. The objective of this study is to develop a simple ground water aeration system to remove radon at the individual household level. The aeration system studied in this research utilized a venturi injector, which is considered a passive method of aeration unlike the aeration systems currently available in the market. With enough …

Spatial Transferability Of Expert Opinion Models For American Beaver Habitat, Isidro Barela, Leslie M. Burger, Guiming Wang, Kristine O. Evans, Qingmin Meng, Jimmy D. Taylor

United States Department of Agriculture Wildlife Services: Staff Publications

Species distribution models and habitat suitability models (HSMs) have become a popular tool in the conservation of biodiversity. However, the ability to predict species spatial distributions at sites beyond the data source sites (i.e., spatial transferability) is critical for the applications of HSMs in the management and conservation of rare or endangered species. The main objective of our study was to assess the predictive performance and spatial transferability of expert opinion models (EOMs). To build EOMs, we identified through extensive literature reviews 17 key landscape variables to characterize habitat use by American beaver (Castor canadensis). We developed 31 pairwise opinion …

Anthraquinone Repellent Seed Treatment On Corn Reduces Feeding By Wild Pigs, Nathan P. Snow, Joseph M. Halseth, Scott J. Werner, Kurt C. Vercauteren

United States Department of Agriculture Wildlife Services: Staff Publications

Wild pigs (Sus scrofa) are a destructive invasive species that cause extensive damage to agriculture throughout many regions of the world. In particular wild pigs damage corn more than any other crop, and most of that damage occurs immediately after planting when wild pigs excavate and consume planted seeds. We evaluated whether anthraquinone (AQ), a repellent, could be useful for protecting seed corn from consumption by wild pigs. Specifically, we conducted cafeteria-style tests at 16 bait sites for 6 nights using concentrations of: untreated, 0.5, 1.5, and 3.0% AQ by weight sprayed on whole-kernel corn in AL and …

Modeling Mongoose Rabies In The Caribbean: A Model-Guided Fieldwork Approach To Identify Research Priorities, Caroline C. Sauvé, Erin E. Rees, Amy T. Gilbert, Are R. Berentsen, Agathe Allibert, Patrick A. Leighton

United States Department of Agriculture Wildlife Services: Staff Publications

We applied the model-guided fieldwork framework to the Caribbean mongoose rabies system by parametrizing a spatially-explicit, individual-based model, and by performing an uncertainty analysis designed to identify parameters for which additional empirical data are most needed. Our analysis revealed important variation in output variables characterizing rabies dynamics, namely rabies persistence, exposure level, spatiotemporal distribution, and prevalence. Among epidemiological parameters, rabies transmission rate was the most influential, followed by rabies mortality and location, and size of the initial infection. The most influential landscape parameters included habitat-specific carrying capacities, landscape heterogeneity, and the level of resistance to dispersal associated with topography. Movement …

Social Structure Defines Spatial Transmission Of African Swine Fever In Wild Boar, Kim M. Pepin, Andrew J. Golnar, Tomasz Podgórski

United States Department of Agriculture Wildlife Services: Staff Publications

The spatial spread of infectious disease is determined by spatial and social processes such as animal space use and family group structure. Yet, the impacts of social processes on spatial spread remain poorly understood and estimates of spatial transmission kernels (STKs) often exclude social structure. Understanding the impacts of social structure on STKs is important for obtaining robust inferences for policy decisions and optimizing response plans. We fit spatially explicit transmission models with different assumptions about contact structure to African swine fever virus surveillance data from eastern Poland from 2014 to 2015 and evaluated how social structure affected inference of …

Diet Of Long-Eared Owl And Common Kestrel In An Urban Landscape (Ukraine), Ivan Zahorodnyi, Oleksii Dubovyk, Ivan Komarnytskyi, Ihor Dykyy

Biological Sciences Faculty Publications

In the present study we performed a comparative dietary analysis of two predatory birds, the Long-eared Owl (Asio otus) and the Common Kestrel (Falco tinnunculus) in the district of Lviv city. We found that the Long-eared Owl and the Common Kestrel are typical small mammal specialists within the urban ecosystem. Considering the abundance and biomass of prey, small mammals comprise 98.4% of the Long-eared Owl’s diet. The species composition of mammals coincides almost 50% in the food intake comparison of the two birds. It has been established that the main prey of both species is the …

Spatio-Temporal Modelling Of Tick Life-Stage Count Data With Spatially Varying Coefficients, Thabo Lephoto, Henry Mwambi, Oliver Bodhlyera, Holly Gaff

Biological Sciences Faculty Publications

There is a vast amount of geo-referenced data in many fields of study including ecological studies. Geo-referencing is usually by point referencing; that is, latitudes and longitudes or by areal referencing, which includes districts, counties, states, provinces and other administrative units. The availability of large geo-referenced datasets for modelling has necessitated the development and application of spatial statistical methods. However, spatial varying coefficients models exploring the abundance of tick counts remain limited. In this study we used data that was collected and prepared by researchers in the Department of Biological Sciences from the Old Dominion University, Virginia, USA. We modelled …

Low-Level Groundwater Atrazine In High Atrazine Usage Nebraska Counties: Likely Effects Of Excessive Groundwater Abstraction, Moses New-Aaron, Olufemi Abimbola, Raheleh Mohammadi, Oluwaseun Famojuro, Zaeema Naveed, Azar Abadi, Jesse E. Bell, Shannon Bartelt-Hunt, Eleanor G. Rogan

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Recent studies observed a correlation between estrogen-related cancers and groundwater atrazine in eastern Nebraska counties. However, the mechanisms of human exposure to atrazine are unclear because low groundwater atrazine concentration was observed in counties with high cancer incidence despite having the highest atrazine usage. We studied groundwater atrazine fate in high atrazine usage Nebraska counties. Data were collected from Quality Assessed Agrichemical Contaminant Nebraska Groundwater, Parameter–Elevation Regressions on Independent Slopes Model (PRISM), and water use databases. Descriptive statistics and cluster analysis were performed. Domestic wells (59%) were the predominant well type. Groundwater atrazine was affected by well depth. Clusters consisting …

Geocoding Cryptosporidiosis Cases In Ireland (2008–2017)—Development Of A Reliable, Reproducible, Multiphase Geocoding Methodology, Lisa Domegan, Patricia Garvey, Paul Mckeown, Howard Johnson, Paul Hynds, Jean O'Dwyer, Coilín Óhaiseadha

Articles

Background: Geocoding (the process of converting a text address into spatial data) quality may affect geospatial epidemiological study findings. No national standards for best geocoding practice exist in Ireland. Irish postcodes (Eircodes) are not routinely recorded for infectious disease notifications and > 35% of dwellings have non-unique addresses. This may result in incomplete geocoding and introduce systematic errors into studies.

Aims: This study aimed to develop a reliable and reproducible methodology to geocode cryptosporidiosis notifications to fine-resolution spatial units (Census 2016 Small Areas), to enhance data validity and completeness, thus improving geospatial epidemiological studies.

Methods: A protocol was devised to utilise …