Life Sciences Commons^™

Preservation Of Genetic Diversity And Selection Over A Century In A Coral Reef Fish (Taeniamia Zosterophora) In The Philippines, Kyra S. Fitz, Rene A. Abesamis, Jemelyn Grace P. Baldisimo, Abner A. Bucol, René D. Clark, Eric Garcia, Ivan R. Lopez, Sharon F. Magnuson, Marial J. Malabag, Richard N. Muallil, Lynne R. Parenti, Brendan R. Reid, Mudjekeewis D. Santos, Christopher E. Bird, Kent E. Carpenter, Malin L. Pinsky

Biological Sciences Faculty Publications

Evaluating the evolutionary impacts of anthropogenic activity on populations is key to understanding species resiliency and to designing effective conservation strategies. Sequencing DNA from historical specimens provides the opportunity to establish a historical baseline and empirically assess changes in genetic diversity, changes in effective population size, and selection over time. Here, we sequenced historical and contemporary samples of the cardinalfish Taeniamia zosterophora collected in 1908 and in 2021-2022 across two sites with differing human impact in the Philippines. At both sites, genetic diversity increased over time, with contemporary samples having significantly higher Watterson's Θ than historical samples. This diversity increase …

Low Salinities Impair Heat Tolerance And Alter Reproductive Traits With No Implications For Survival In A Marine Annelid From Coastal Habitats, Gabrielle Newton, Gloria Massamba-N'Siala

Biological Sciences Faculty Publications

Climate change is expected to intensify salinity and temperature fluctuations in estuarine and coastal habitats. However, the impact of salinity variation on ectotherms’ thermal tolerance remains underexplored, limiting our understanding of the interplay between these stressors. This study investigated salinity-dependent changes in life history traits (survival, growth rate, fecundity, and egg size) over a 33-day exposure to a salinity gradient (12, 17, 22, 27, 32, 35, 40, 45, 50) in the marine annelid Ophryotrocha labronica. Individuals that survived the salinity treatments were assessed for their upper and lower thermal tolerance limits. Female individuals, the target of the study, exhibited …

Tick Responses To Diverse Chemical Attractants To Enhance Tick Surveillance Methods' Efficacy, Pamela Kelman, Tyler Chavers, Emily Owens Pickle, Daniel Sonenshine, Melissa S. Nolan, Holly Gaff

Biological Sciences Faculty Publications

Amblyomma maculatum Koch (Acari: Ixodidae), Ixodes scapularis Say, and Dermacentor variabilis Say are three hard-bodied ticks responsible for vectoring pathogens that cause most human tick-borne diseases in the United States of America (USA). Tick surveillance is critical to elucidate high-risk areas for targeted vector control and public health interventions. Despite tick-borne diseases having a higher annual incidence compared to mosquito-borne diseases in the USA, tick traps used for surveillance are grossly under-developed compared to the suite of sophisticated mosquito traps available on the commercial market. This study sought to identify potential prospective tick trap improvements by evaluating the relative attraction …

Hair Growth Rate Estimation In North American Ursids, Jennifer H. Stern, Karyn D. Rode, Craig A. Stricker, Sheriden Ploof, Cindy L. J. Roberts, Celess Edinger, Mary Humbyrd, Nate Wagner, Megan A. Owen, John P. Whiteman, Thea Bechshoft, Brent White, Kristin L. Laidre

Biological Sciences Faculty Publications

The feeding ecology of wildlife populations has important implications for individual health, population productivity and distribution patterns. For ursids (bears), food resources and feeding behaviour primarily affect population dynamics via effects on cub production and survival. Much of what is known about the feeding ecology of bears is based on analyses of tissues collected from capture-based research efforts, harvested animals or non-invasive approaches. However, inference about diet from hair has been limited by a lack of quantitative data on the timing of the moult and hair growth rates. We conducted a study to develop and test two methods of quantifying …

The Prize Biter Of Modernity? Investigating Killer Whale Bite Mechanics, Daniel Hong

West Chester University Graduate Theses, Dissertations, and Final Projects

Although the killer whale (Orcinus orca) is a cosmopolitan apex predator, very little work has been done on its feeding biomechanics. Here I use finite element analysis to investigate the mandibular stiffness of a juvenile male Bigg’s killer whale, and compare it to that of the false killer whale (Pseudorca crassidens) and the saltwater crocodile (Crocodylus porosus). Full mandibles and left and right halves of mandibles are simulated under FEA. I also estimate the total jaw muscle force produced by the Bigg’s killer whale using the dry skull method. The killer whale lacks an …

Letter From The Dean, Jeff Edwards

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Assessing The Prevalence Of Ehrlichia Spp. In Ticks Associated With Canids In Arkansas, Eva Berryhill, Kelly Loftin

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Canine ehrlichiosis is a common disease seen in dogs. The southeastern United States has been identified as an area of high prevalence, including Arkansas. Changes in climate, household income, and tick population are factors contributing to high prevalence. Canine ehrlichiosis is caused by three Ehrlichia spp., which are E. canis, E. ewingii, and E. chaffeensis. Ticks transmit the pathogen, specifically Rhipicephalus sanguineus, Dermacentor variabilis, and Amblyomma americanum. For this study, the goal was to determine the prevalence of Ehrlichia spp. in Arkansas that causes canine ehrlichiosis. Ticks were collected from host canines and environmental …

Factors Influencing Adherence To Surveillance Guidelines In Individuals With Tuberous Sclerosis Complex, Kashish Khanna

Theses and Dissertations

Tuberous Sclerosis Complex (TSC) is a genetic condition that is caused by pathogenic changes in either the TSC1 or TSC2 gene and is characterized by multiple benign tumors, otherwise known as hamartomas, in various organs such as the brain, skin, lungs, and kidneys. Because of the many different clinical manifestations of TSC, extensive surveillance guidelines are recommended for individuals with TSC. Past studies have shown that there has been a gap in knowledge of these surveillance guidelines. These studies also suggest projects that measure adherence to surveillance guidelines and address specific challenges hindering surveillance guideline adherence. This study aims to …

Spatial And Temporal Patterns In Short-Term Surface Sediment Deposition And Accretion At The Guana Tolomato Matanzas National Estuarine Research Reserve: Implications For Resilience Of Coastal Wetlands To Sea-Level Rise, Jacob Michael Berna

UNF Graduate Theses and Dissertations

Coastal wetlands are at risk of drowning due to the increasing threat of rising sea levels. Wetlands will have to build in elevation vertically or migrate horizontally to survive. Previous research has demonstrated that some wetlands have the potential to naturally build in elevation over time if deposition and accretion rates from allochthonous sediment delivery are substantial, but work in this area has been limited, and many coastal wetlands remain understudied. Portions of Northeast Florida are especially lacking in short-term surface deposition and accretion data. Without surface rates it is difficult to determine the vulnerability of different wetlands to rising …

Parental Sources Of Nutrition Information And Their Knowledge, Attitudes, And Behaviors: Impact On Children's Dietary Intake In Ages 2-5 – A Cross-Sectional Study, Mara O. Fiorio

UNF Graduate Theses and Dissertations

Objectives: Nutrition in early childhood is critical to long-term health outcomes and parents play a key role in shaping children’s eating habits. This study examined where U.S. parents of children aged 2–5 obtain nutrition information, source credibility, and how parental nutrition knowledge, attitudes, and behaviors (KAB) relate to children’s dietary intake.

Methods: A cross-sectional online survey was completed by 126 parents, recruited via social media and community networks using convenience sampling. The survey assessed parental sources of nutrition information, perceived trustworthiness, nutrition knowledge, feeding attitudes and behaviors, and child dietary intake. Descriptive statistics summarized demographic characteristics and source utilization. Chi-square …

The Presence Of Mercury (Hg) And Perfluoroalkyl Substances (Pfas) In The Guana And Tolomato Rivers, Morgan E. Lattomus

UNF Graduate Theses and Dissertations

The Guana and Tolomato Rivers provide essential habitat for several ecologically and economically important species and is a well-loved and recreated area. Spanning the northeastern Florida coast, the rivers are home to over 50 endangered or threatened species and host several habitat restoration projects due to their ecological significance and proximity to development along the coast. The effects of human influence and pollution, and specifically toxic metal mercury (Hg) and perfluoroalkyl substances (PFAS), are not well known within the system. Hg is known to biomagnify within food webs, and there is a considerable lack of literature concerning PFAS behavior within …

Dataset On Indoor And Outdoor Pm2.5 Concentrations At Two Residences Using Low-Cost Sensors In The Rio Grande Valley Region Of South Texas, Kabir Bahadur Shah, Sai Deepak Pinakana, Mkhitar A. Hobosyan, Armando Montes, Amit U. Raysoni

School of Earth, Environmental, & Marine Sciences Faculty Publications

Fine particulate matter (PM2.5) is one of the criteria air pollutants associated with adverse respiratory and cardiovascular health effects. This dataset contains hourly and daily averaged measurements of PM2.5 concentrations (µg/m3) collected from two residential homes in the Rio Grande Valley (RGV) Region of South Texas, using PurpleAir-II-SD low-cost sensor. In addition, the dataset also includes temperature (ºC) and relative humidity (%) measured by the sensors. The data was collected for one month during the summer season from indoor (kitchen) and outdoor (front yard) environments at two locations: Home-1 in Weslaco City from June 16, 2024, to July 16, 2024, …

Utah Forest Restoration Institute Annual Report 2025, Utah Forest Restoration Institute

Reports

Utah’s landscapes are shaped by wildfire and other natural disturbances that impact ecosystems and communities. The Utah Forest Restoration Institute (UFRI), based at Utah State University, provides relevant, timely, practical science about forest and fire management to improve the health of Utah’s unique forests and woodlands. As Utah’s central hub for science-based, actionable knowledge about forest management and restoration, UFRI serves as a bridge between science and implementation, and is a trusted source of information for managers, policymakers, and the public.

Disposal Of Nanoplastics By The Brain: Plastic Persistence And Upregulation Of A Putative Plastic-Degrading Enzyme After Exposure To Polystyrene-Infused Food, Callie C. Mauersberg

College of Graduate Studies: Theses & Dissertations

Plastic is a ubiquitous material used in many domestic and commercial applications. Widespread use of plastic has led to environmental accumulation of plastic waste, and microplastics have inundated human food and water sources. Once consumed, it is well established that microplastics translocate from the gut to other tissues, including the brain, via the circulatory system. However, it is unknown if nanoplastics persist permanently in the brain. Additionally, it is not known if microplastics can be enzymatically degraded by phagocytic cells in the CNS, such as microglia and astrocytes. Alkane monooxygenase-homolog 7 (Alkbh7) is a mitochondrial enzyme that may …

Bugs In The Flux: Links Between Arthropod Diversity And Spatial Variation Of Soil Respiration In A Temperate Forest, Erin-Darby H. Mcclain

Theses and Dissertations

Soil respiration (Rs) is the largest terrestrial flux of carbon (C) to the atmosphere, with heterotrophic contributions to Rs varying spatially and temporally. While microbes are the primary and most thoroughly studied source of soil heterotrophic respiration (Rh), contributions from higher trophic organisms, including arthropods, are rarely quantified and poorly understood. Arthropod abundance and diversity correspond with variation in soil microclimate, which is influenced by site factors including canopy structure, site productivity, and disturbance. However, the extent to which these site factors influence arthropod abundance and diversity, and consequently, spatial variation in Rs is not known. The objective of our …

Mdma Enantiomers: An Exploration Into 5-Ht2ar Necessity In Non-Hallucinogen Induced Frontal Cortex Plasticity, Maya C. Gaines-Smith

Theses and Dissertations

Entactogen 3,4-methylenedioxymethamphetamine (MDMA) has gained increasing attention as a potential psychotherapeutic, particularly for psychiatric disorders that have proven to be resistant to traditional treatments. Despite its growing popularity, the complete neurobiological mechanism of MDMA enantiomers, as well as the role of sex in these mechanisms, remains to be fully elucidated. Current ongoing research implicates agonism of the serotonin (5-HT) 2A receptor (5-HT_2AR) and neuroplastic growth in the success of other psychoactive and hallucinogenic pharmacotherapeutics, highlighting the importance of understanding the role that the 5-HT_2AR plays in the therapeutic mechanism of action of MDMA enantiomers. The culmination …

Scopolamine-Induced Modulation Of Serotonin And Dopamine Transporters Activity: Behavioral And Molecular Insights Into Rapid Antidepressant Action, Deepak Karunakaran

Theses and Dissertations

Major depressive disorder (MDD) affects over 350 million individuals worldwide and is characterized by profound dysregulation of serotonin (5-HT) and dopamine (DA) systems that govern mood, reward processing, and motivation. The serotonin transporter (SERT) and dopamine transporter (DAT), both dynamically regulated through phosphorylation, serve as critical determinants of synaptic monoamine signaling. Despite decades of therapeutic development, current antidepressants require 4-6 weeks to achieve efficacy, and approximately one-third to half of patients develop treatment-resistant depression. The emergence of rapid-acting antidepressants like ketamine represents a paradigmatic shift, demonstrating symptom relief within hours; however, ketamine's therapeutic potential remains constrained by abuse liability, dissociative …

Exploring The Role Of Host Immune Responses And Bacterial Sensory Pathways In The Development Of Treponema Denticola-Mediated Periodontal Disease, Annie N. Hinson

Theses and Dissertations

Periodontitis is a chronic inflammatory disease driven by dysbiotic microbial communities and maladaptive host responses. Treponema denticola, a spirochete pathobiont, is strongly associated with disease severity. However, the molecular mechanisms underlying its interaction with host tissues and regulation of virulence remain incompletely understood. This work examines both the epithelial immune responses and bacterial transduction systems that shape T. denticola pathogenesis. Transcriptomic analysis of gingival keratinocytes revealed IL-36γ as the most highly induced cytokine following infection with T. denticola. Functional studies demonstrated that IL-36γ induction occurs in a dose- and time-dependent manner through TLR2/6 signaling, requiring the NF-κB, PI3K/Akt, and …

Functional Analysis Of Ligand Binding Domain 2 Of Outer Surface Protein C Of Borreliella Burgdorferi, Gavin Z. Chambers

Theses and Dissertations

Lyme disease, caused by the spirochete Borreliella burgdorferi, is the most common vector-borne infection in North America. A critical determinant of early mammalian infection is outer surface protein C (OspC), a highly variable lipoprotein that is indispensable for spirochete survival but whose precise function remains unresolved. OspC has been proposed to mediate diverse roles, including complement evasion, adhesion, tissue dissemination, and antiphagocytic activity, supporting the view that it is a multifunctional virulence factor. Structural studies have identified two putative ligand-binding domains (LBD1 and LBD2), with LBD2 forming a solvent-exposed crown at the membrane-distal end of the OspC dimer.

To …

Monograph Available: Urban Coyotes As A Source Of Conflict With Humans: An Evaluation Of Common Management Practices

Human–Wildlife Interactions

This is an announcement about the published monograph titled "Urban Coyotes as a Source of Conflict with Humans: An Evaluation of Common Management Practices." This publication, part of the HWI Monograph Series, is online and open access.

Evaluating Lethal Coyote Management In The Chicago Metropolitan Area Using A Conflict Recurrence Metric, Jeffrey T. Schultz, Scott Beckerman, Robert Erickson, Danielle Montgomery, Stewart W. Breck

Human–Wildlife Interactions

Human–coyote (Canis latrans) conflict in urban environments is prevalent in cities throughout the United States. Urban areas commonly use nonlethal techniques to mitigate coyote-caused conflicts but will also incorporate selective removal of individual coyotes when conflicts persist. However, little research has evaluated these management strategies. This study analyzed coyote removal efforts conducted in the Chicago Metropolitan Area from 2010 to 2020. To evaluate the management actions, we used “time without incidence”—the time elapsing from an initial conflict until either a subsequent conflict occurred in the same area, or when the data collection period ended—as an index of effectiveness. …

Use Of Scat Dna To Estimate Coyote Abundance On A Newly Colonized Barrier Island, Sonia M. Hernandez, Michael J. Yabsley, Sarah C. Webster, Elizabeth M. Kierepka, Rochelle R. Beasley, Carly L. Landa, Heather W. Barron, Kelly Sloan, Holly Milbrandt, James C. Beasley

Human–Wildlife Interactions

Coyotes (Canis latrans) have expanded in mainland eastern North America and are known to have successfully colonized numerous islands. However, there are scarce data on the densities of coyotes in these ecosystems, in which coyotes can have substantive negative impacts. Coyotes first colonized Sanibel Island, a barrier island off the western coast of Florida, USA, in 2011, and their presence has been linked to declines in several sensitive species. However, the population size of coyotes has only been estimated from anecdotal reports and camera traps. Our goal was to estimate the size of the coyote population on Sanibel …

Cost-Effective Strategies For Feral Swine Control: Exploring Trapping Equipment Cooperatives, Phil Kenkel, Riza Radmehr, Rodney Holcomb, Mckenzie Boyce

Human–Wildlife Interactions

Feral swine (Sus scrofa) in the United States have become a growing concern, with a population of ≥6 million and causing annual damages of ≥$1.5 billion USD. Because of their high reproductive capacity, effective control methods are crucial to reducing or slowing their population growth. While remotely monitored and triggered traps have proven to be an effective control strategy, the cost of sophisticated trapping equipment, which can cost ≥$7,000 USD, is often cost prohibitive for many landowners. Despite the pressing need to address the challenge of making effective feral swine control methods more affordable, there are few studies …

Factors Influencing The Discovery And Use Of Carrion By Vertebrate Scavengers From Human-Induced Mass-Mortality Events, Samantha J. Leivers, Michael J. Bodenchuk, Tyler A. Campbell, John M. Tomeček

Human–Wildlife Interactions

Scavengers play critical roles in ecosystem health and stability, and both biotic and abiotic factors can influence scavenger guild dynamics. Carrion is often limited both temporally and spatially on the landscape, but mass mortality events (MMEs)—in which there is an influx of carrion biomass on the landscape—may result in different scavenger community dynamics compared to when carrion is scarcely distributed. In this study, we investigated factors affecting the discovery and use of carrion by a natural, unharrassed scavenger guild during wild pig (Sus scrofa) MMEs conducted at East Foundation’s San Antonio Viejo Ranch in South Texas, USA. We …

Bird Strikes During Climb And Approach: A Need For Innovative Management Strategies, Richard A. Dolbeer, Michael J. Begier

Human–Wildlife Interactions

Wildlife Hazard Management Plans at civil airports in the United States cannot directly address threats posed by birds moving through aircraft climb and approach paths unrelated to nearby bird-attractant habitats such as landfills. As an iconic example, an Airbus 320 departing LaGuardia Airport (New York, USA) on January 15, 2009, struck a flock of migratory Canada geese (Branta canadensis) 8 km out at 884 m above ground level (AGL) that resulted in a water landing now known as the “Miracle on the Hudson.” We documented 1,841 and 458 strikes from 2009 to 2023 involving large (≥1.8 kg) and …

Human–Wildlife Interactions Monograph Series

Human–Wildlife Interactions

The Human–Wildlife Interactions (HWI) Monograph Series is published in both print and online formats through the Jack H. Berryman Institute at Utah State University. See the current and forthcoming publications in this series.

Refine Fuels Treatments In The Wildland–Urban Interface With Wildlife In Mind, Miles Becker, Catrin M. Edgeley, David Stoner

Human–Wildlife Interactions

Conserving urban tree and shrub cover provides many benefits for wildlife and people, yet often becomes a lower priority than fuels treatments to mitigate fire risk in the wildland–urban interface (WUI). We support the principle that considering multiple objectives on privately owned property is valuable and can be achieved. Data sharing and collaboration between wildfire experts and wildlife biologists could improve the quality and extent of managing both animals and fire. Furthermore, the adoption of statewide policy and municipal regulations for preventing wildfires in the WUI provides an opportunity to incorporate ecological functions in the same directives for a balanced …

Using Advanced Machine Learning To Evaluate The Spatial And Temporal Patterns Of Human–Bear Interactions In Maryland, Usa, Katherine A. Kurth, Jonathan K. Trudeau

Human–Wildlife Interactions

American black bears (Ursus americanus) are highly adaptable to human-dominated areas, which can lead to interactions with humans. Managing these interactions is a priority for many wildlife agencies in North America. Climate-induced shortages in natural food can exacerbate human–bear interactions, as bears are driven to seek alternative food sources in human-dominated areas. However, few studies have investigated the impact of climate or weather on the frequency and severity of human–bear interactions. In Maryland, USA, no research has examined the anthropogenic or environmental factors contributing to human–bear interactions, even though reported interactions have consistently increased since the 1990s. Our …

Examining Exercise Self- Efficacy And Functional Mobility In Urban Law Enforcement Officers, Margo F. Jenkins

College of Graduate Studies: Theses & Dissertations

BACKGROUND: Law enforcement officers perform various physically demanding tasks, but much of their daily activities are sedentary or light intensity. Quality movement patterns are vital for fitness, reducing the risk of injuries, and contributing to motivation for physical activity. PURPOSE: This study examined the relationship between exercise self-efficacy (ESES) and functional mobility (FMS) among law enforcement officers. METHODS: 55 officers participated, with exercise self-efficacy measured using the ESES scale and movement patterns assessed with the Functional Movement Screening (FMS). Correlational analysis and linear regression were used to explore the relationships between FMS and ESES, years of service (YoS) and FMS, …

Epigenetic Potential Remains Stable Over 100 Years After Introduction, Danielle Dawkins

College of Graduate Studies: Theses & Dissertations

Introduced species provide important insights into organismal behavioral responses. Epigenetic mechanisms are one of the various ways in which behaviors can be modified, particularly through DNA methylation. Through such mechanisms, phenotypic changes can occur in response to environmental changes, allowing an organism to be more plastic. Epigenetic potential (EP) represents the capacity for an organism to be epigenetically modified, and can be measured by counting CpG motifs; cytosine adjacent to guanine within a DNA sequence. Phenotypic plasticity as it relates to EP has been studied extensively in the house sparrow (Passer domesticus), a globally introduced songbird. It is …