Digital Commons Network^™

Assessing Coho Salmon (Oncorhynchus Kisutch) Distribution Using Traditional Sampling Methods In Conjunction With Edna On Trinity River Tributaries Within The Hoopa Tribal Boundaries, Ely D. Boone

Cal Poly Humboldt theses and projects

Detecting the presence of species using environmental DNA (eDNA) is a fast-growing field of study that shows much promise for population monitoring. In fisheries biology, eDNA is a potentially powerful tool compared to traditional fisheries monitoring techniques such as visual observation via snorkel surveys. When eDNA and traditional survey methods are employed in tandem, using the same spatial and temporal sampling design, eDNA often detects target species when traditional methods do not. In this study, instead of utilizing this paired study design, I implemented eDNA and snorkel surveys at different sampling scales with eDNA being collected at a single downstream …

Multiple Burn And Forest Characteristics Affect Gray Fox (Urocyon Cinereoargenteus) Occurrence Following A California Megafire, Amida Zohar Verhey

Cal Poly Humboldt theses and projects

In western North American forests, predator communities are faced with changing fire regimes and increased fire severity and size, particularly with megafires (>10,000 ha). As some wildlife communities may restructure following the loss of apex consumers, understanding post-fire space use of mid-trophic carnivores may inform species composition in these forests. I compared gray fox (Urocyon cinereoargenteus) occupancy in and around the 2021 Dixie Fire, the largest single-ignition fire in California state history, to examine which spatially variable burn and forest characteristics affected the space use of a widespread generalist mesopredator. Using 210 camera traps placed in 2023, …

Foundations For Trojan-Y Chromosome Development In Sacramento Pikeminnow (Ptychocheilus Grandis): A Novel Strategy For Invasive Species Management In The Eel River, Ca, Raven Mcadams

Cal Poly Humboldt theses and projects

The Sacramento Pikeminnow (Ptychocheilus grandis), an invasive predator in California’s Eel River, contributes to predation pressure on native salmonid populations despite ongoing suppression programs. This study assessed the feasibility of hormonal sex reversal as an initial step toward implementing the Trojan Y Chromosome (TYC) strategy as a novel tool for managing invasive Sacramento Pikeminnow populations in the Eel River, CA. Objectives were to 1) determine the size when gonadal differentiation occurs 2) identify an effective estradiol dosage for producing phenotypic XY females, and 3) identify sex-reversed fish using a sex-specific genetic marker.  Histological examination of juvenile fish was …

Relational Approaches To Fire Resilience: Designing A Living Shaded Fuel Break With Indigenous Knowledge Systems, Natalee Nicole Lopes

Cal Poly Humboldt theses and projects

Escalating wildfire severity across California reflects not only changing climatic conditions but also the cumulative impacts of colonial land management systems that have disrupted Indigenous fire stewardship and altered forest structure and function. This project examines how wildfire mitigation infrastructure, specifically linear fuel treatments, such as fuel breaks, can be reimagined through Indigenous relational frameworks of care-based land stewardship. Grounded in Happy Camp (Athithúfvuunupma), California, within the ancestral homelands of the Karuk Tribe along the mid-Klamath River, this research is carried out in collaboration with Karuk knowledge holders, centering Indigenous knowledge systems and priorities.

Using a mixed-methods approach that integrates …

Effects Of Conifer Encroachment On Oregon White Oak Crown Structure And Nonvascular Epiphyte Communities, Courtney Jonell Copper

Cal Poly Humboldt theses and projects

Oregon white oak (Quercus garryana, QUGA) is an ecologically and culturally important broadleaf tree species native to northern California and the Pacific Northwest. Fire suppression and subsequent encroachment by Douglas-fir (Pseudotsuga menziesii, PSME) and other conifers have made QUGA woodlands among the most threatened habitat types in the region. This study examines the influence of conifer encroachment on QUGA crown structure and nonvascular epiphyte (NVE) communities using ground- and crown-based sampling techniques.

Twenty-four trees were sampled across four sites in northern California along a gradient of conifer encroachment that was quantified as PSME basal area (BA). A …

From Theory To Ecosystems: Exploring Biodiversity And Ecosystem-Function In Pitcher Plant (Darlingtonia Californica) Microbial Communities, Gavin Sutter

Cal Poly Humboldt theses and projects

The relationship between biodiversity and ecosystem-function (BEF) has been a central focus of ecological research for the last three decades, yet the role of space in shaping BEF relationships remains relatively unknown. Research has shown that community diversity and composition can strongly influence productivity, nutrient cycling, and decomposition, but much of this work treats communities as spatially isolated, leaving open how dispersal and other spatial processes shape BEF at broader scales. To begin addressing this gap, I used microbial communities inhabiting Darlingtonia californica pitcher plant leaves to evaluate how spatial organization and successional change shape biodiversity and ecosystem-functioning. I quantified …

Assessing A Half-Century Of Change In Understory Plant Range And Frequency In The Klamath Mountains Of California, Emily Jean Jackson

Cal Poly Humboldt theses and projects

The effects of climate change have and will continue to impact plant communities, including by potentially shifting species’ ranges towards topographically sheltered, cooler locations or higher elevations. In 2024, I resampled 140 vegetation plots established in 1969 in the Klamath Mountains of Northern California to assess range shifts of 46 understory species over a 55-year period. During this time, the elevational distribution of all species has increased significantly by an average of 26.9 m, but this increase was slower than necessary to track historic temperature niches given regional warming (215-311 m). Despite this overall increase, only four species exhibited significant …

Integrating Multi-Method Monitoring To Characterize Seasonal Habitat Use Of Green Sturgeon (Acipenser Medirostris) In Humboldt County, California, Olivia S. Boeberitz

Cal Poly Humboldt theses and projects

Green sturgeon (Acipenser medirostris) are a long-lived, anadromous, iteroparous species that spawns in large West Coast North American rivers but ranges widely in the coastal ocean. For coastal California Native American Tribes, green sturgeon are a vital part of their cultural heritage and traditions, and central to their food security. Two genetically distinct population segments (DPSs) of green sturgeon are recognized in the United States, Canada, and Mexico; the southern DPS is listed as “threatened” under the Endangered Species Act and the northern DPS is considered of “conservation concern.” Although green sturgeon are known to use large estuaries …

Evidence Of Personality And Movement Syndromes In A Mobile Predator: How Individual Hunting Strategy Shapes Ecosystem Service Potential By Barn Owls (Tyto Furcata) In An Agroecosystem, Lauren M. Jackson

Cal Poly Humboldt theses and projects

Animal-mediated ecosystem services are delivered through the behavior of individuals, yet most studies evaluate service-providing species at the population level. We tested whether individual variation in plumage, behavior, and movement predicted hunting behavior and vineyard habitat use by adult male American barn owls (Tyto furcata) nesting in winegrape vineyards in Lodi, California, USA. We fitted GPS-accelerometer tags to 42 breeding males, quantified breast-plumage traits, measured neophobia using repeated novel object tests, and derived nightly movement metrics from GPS tracks and hidden Markov model-classified hunting locations. Several behavioral traits were repeatable, but movement traits showed the clearest repeatable individual …

Baker Cypress (Hesperocyparis Bakeri) In A Changing Fire Landscape: Characterizing Fire Refugia And Guiding Post-Fire Reforestation, Olivia Lorraine Moskowitz

Cal Poly Humboldt theses and projects

Increasing wildfire frequency threatens serotinous, fire-obligate species that depend on sufficient fire-free intervals to develop seed banks for reproduction. These species require fire intense enough to trigger seed release and create favorable substrate and light levels for regeneration, yet consecutive fires that reburn populations before they reach maturity can cause local population contraction or extirpation. Understanding the environmental drivers of natural regeneration and mature tree survival, as well as when and how active reforestation should supplement natural recovery, is critical for managing fire-adapted species under altered fire regimes.

This thesis uses Baker cypress (Hesperocyparis bakeri [Jeps.] Bartel), a rare …

Symmetry In Affiliative Interactions Of North American River Otters (Lontra Canadensis) In A Northern California Estuary, Charlotte E. Norman

Cal Poly Humboldt theses and projects

Patterns of participation in affiliative behaviors may reflect underlying social dynamics. Two affiliative behaviors, allogrooming and social play, were assessed for their symmetry, or relative participation of participants, in a wild group of North American river otters. Behavioral observations were conducted over five months at the Little River estuary in northern California using video recordings and all-occurrence sampling. Observations included all-adult groups, a family group consisting of a breeding female and two pups, and an extended family group with one or two helpers, indicative of cooperative breeding. Individuals engaged in allogrooming and social play were classified by their group membership, …

Using Ai For Protein Structure Prediction And Binding In Biochemistry, Eli Whiteman-Owens

IdeaFest 2026

This poster highlights how AI can be used to predict tertiary protein structures in silico and the potential applications for drug development and biofuel production.

Small Mammal Diversity In Coastal Humboldt County Inferred From Owl Pellets And Complementary Trapping Surveys, Abigayle Hendon

IdeaFest 2026

Analysis of small mammal diversity and abundance in coastal Humboldt County through the identification of skeletal remains found in owl pellets, supplemented and validated by live trapping to account for local morphological variation.

Analyzing Red Panda Behavior As An Indicator Of Welfare, Megan Kollias

IdeaFest 2026

My project examines the daily activity budget of a singular red panda at the Sequoia Park Zoo, quantifying how behavior compare to wild red panda datasets as an indicator of animal welfare. Using an ethogram and systematic observations, I analyze how closely these patterns align and identify husbandry features that may influence the expression of natural behavior.

Tms Phantoms For Investigating Multimodal Neuromodulation Procedures, Wesley H. Lohr

Theses and Dissertations

Evidence suggests that combining deep brain stimulation (DBS) and transcranial magnetic stimulation (TMS) is potentially unsafe for certain TMS target locations, though TMS can alleviate several DBS-resistant PD symptoms such as speech impairment, freezing of gait, and dysphagia. Addressing this issue, head phantoms designed for TMS with embedded electric field (E-field) triaxial dipole probes (TDPs) are used to investigate a tunable magnetic shield that can protect implants from periphery E-fields and focalize magnetic fields. Through segmentation of MRI files, 3D printing, and injection molding of CNT-PDMS conductive composites, anatomical head phantoms are created. Anchoring TDPs to clinically relevant regions in …

The Effects Of Stress-Related Hormones On Excitatory Synapse Formation, Autumn C. Garvey

Honors Undergraduate Theses

Stress profoundly influences brain function through neuromodulatory hormones that regulate synaptic plasticity, yet how temporal patterns of hormone exposure shape excitatory synapse formation remains poorly understood. This study investigates how exposure to stress hormones, norepinephrine and cortisol, affects excitatory synapse development. While existing research primarily compares concentration models, real-world stress occurs in variable patterns that may produce distinct neural outcomes. To address this gap, differentiated Neuro2A neuronal cells are exposed to norepinephrine or cortisol under a continuous treatment paradigm designed to model chronic stress conditions. Following treatment, immunofluorescence imaging is utilized to quantify excitatory synapse formation through analysis of presynaptic …

Reimagining Emily Dickinson And Rupi Kaur’S Techniques For A Contemporary Creative Portfolio, Julia S. Gearing

ENG 490 Senior Seminar Capstone

This thesis combines literary analysis and creative practice to examine how notorious poet Emily Dickinson and up and coming Rupi Kaur have shaped the genre of poetry over time and can influence a novice writer, such as myself. Through close reading and analysis of Dickinson and Kaur’s work this thesis identifies key stylistic and thematic elements and uses my findings to influence original poetry, with the goal of experimenting and expanding upon the use of craft within my writing. This project demonstrates how critical analysis of other successful authors can inform creative expression and broaden the literary realm.

Horizontal Gene Transfer And Reciprocal Chimerism In Compactonostoc (Nostocales, Cyanobacteriophyta) With Evidence For Two New Species In The Genus., Daniel Al Fatayri

Masters Essays

The genus Nostoc has long been known to be polyphyletic, and recent taxonomic work has segregated several Nostoc-like lineages into new genera, including Compactonostoc. Until now, Compactonostoc shennongjiaensis was the only described species in the genus. In a survey of biological soil crusts from Santa Catalina Island (California, USA), we isolated two Nostoc- like strains that phylogenetically affiliate with Compactonostoc. A polyphasic approach based on morphology, 16S rRNA gene phylogeny, 16S–23S ITS secondary structure, and cloned ribosomal operons revealed that each strain harbors two highly divergent ribosomal operon types. One operon (Type 2) is closely related to C. shennongjiaensis and …

Comparative Analysis Of Serum-Free Culture Conditions On Cell Proliferation And Extracellular Vesicle Production By Adipose-Derived Stem Cells, Ayna Ghulldu

Honors Undergraduate Theses

Adipose-derived stem cells (ADSCs) are promising candidates in regenerative medicine due to their proliferative capacity, self-renewal, and secretion of extracellular vesicles (EVs) that mediate intercellular communication. Serum-free media has been increasingly explored for MSC culture as it eliminates xenogeneic components, improving human therapeutic suitability. However, comparative evaluation of distinct serum-free formulations on ADSC proliferation and EV output simultaneously remains limited. This study compares a serum-containing medium to three proprietary serum-free media prototypes differing in composition, including the presence or absence of extracellular matrix proteins, to inform the optimization of culture conditions for clinical use. Proliferation, EV characteristics, and gene expression …

The Depuration Of Microplastic Pollution In Aquacultured Indian River Lagoon Oysters, Lee Nguyen

Honors Undergraduate Theses

Plastics are widely used in consumer goods and industrial manufacturing, and their degradation into microplastics (MP, size < 5 mm) has created an emergent environmental pollutant. Plastics readily enter aquatic environments, where they accumulate additional contaminants and bioaccumulate in organisms. While MP contamination in marine ecosystems is well documented, less is known about MP presence in aquacultured shellfish. Depuration, the process of purging contaminants from shellfish, is conducted in sterile seawater without food, which may cause oyster starvation and death. To date, MP depuration has not been examined in the aquacultured eastern oyster (Crassostrea virginica) in published studies. This study had 3 goals: 1) evaluate the effects of algal feed on oyster survival during depuration, 2) determine the effect of algal feed on depuration effectiveness, and 3) investigate the effect of a ten-day depuration on MP concentration in aquacultured C. virginica soft tissue. MP were quantified in oyster tissues, biodeposits, and in industrial algal feed. Tissues were digested using alkaline solutions, manually examined via microscopy, and analyzed using Fourier-Transform Infrared Spectroscopy (FTIR) to investigate MP polymer …

The Impact Of Gastric Sleeve And Roux-En-Y Gastric Bypass On Chief Cell Function And Protein Digestion In Obese Patients, Garikoitz Mikel Gainza

Honors Undergraduate Theses

Obesity has become one of the largest global health concerns of the 21^st century, correlating with numerous associated diseases. To help address the growing prevalence and burden of obesity, sleeve gastrectomy and Roux-en-Y gastric bypass have become two commonly performed surgical procedures done to promote weight loss by altering the anatomical structure of the stomach and surrounding organs of the gastrointestinal system. Although the benefits of improved metabolism linked to these surgical procedures are well studied, their impact on the physiology of gastric cells, and more specifically chief cells as they relate to protein digestion post-surgery, is yet to …

Iron Deficiency And Iron Deficiency Anemia: Inconsistent Screening Practices And Delayed Result Processing In Children 12-18 Months, Madonna J. Mahoney Marshall

Doctor of Nursing Practice (DNP) Scholarly Projects - Archive

Introduction:

Iron deficiency and iron deficiency anemia in children aged 12 to 18 months are prevalent conditions that, if not identified and treated early, are associated with adverse neurodevelopmental outcomes.

Purpose:

This quality improvement project evaluated the impact of a standardized screening and follow-up protocol on laboratory result retrieval, provider review, and caregiver follow-through in a military pediatric clinic.

Method:

A pre-post intervention design guided by the Plan-Do-Study-Act framework was implemented over 11 weeks and included staff education, standardized workflows, and caregiver outreach.

Results:

The intervention improved laboratory completion and caregiver follow-up rates; however, sustainability was limited by staffing constraints …

Examining The Results Of Revolutions In The Third World: A Case Study Of The Iranian, Libyan, And Nicaraguan Revolutions, Noah A. Mohammedelamien

Honors Undergraduate Theses

This thesis examines the post-revolutionary trajectories of Libya, Iran, and Nicaragua to explain why some Third World revolutionary projects preserve and use elements of their founding ideology while others fragment, personalize, or diffuse over time. Rather than focusing on the causes of revolution alone, it analyzes the durability of religious-socialist ideological continuity after revolutionary upheaval. Using a (MDSD) comparative historical and institutional approach grounded in primary and secondary sources, the study evaluates five key dimensions across the cases: religious-socialist ideological fusion, religious elite loyalty, popular religious mobilization, institutional embedding of ideology, and external pressure. The findings suggest ideological continuity is …

Noninvasive Monitoring Techniques: The Use Of Scat-Sourced Dna And Camera Traps To Monitor Mammalian Carnivore Species At The Ucf Arboretum, Zachary Montealegre

Honors Undergraduate Theses

The 800-acre University of Central Florida Arboretum Natural Lands functions as a conservation area, recreational space, and research site, making it essential to understand the ecological community it supports. Traditional wildlife monitoring methods such as mark-recapture and blood sampling can be effective but may stress animals or disrupt natural behaviors. To minimize these impacts, this study used non-invasive techniques, specifically scat-based DNA analysis and camera trapping, to assess carnivore species' presence. Two ecologically similar sites within the Arboretum were selected. Suspected carnivore scat was collected twice weekly over two months using both structured and opportunistic sampling. DNA was extracted, amplified, …

Sedimentology, Paleontology, And Depositional Environments Of The Upper Devonian Lock Haven Formation In West Burlington Quarry, North-Central Pa, Michael Harman

Honors Theses

The Upper Devonian Lock Haven Formation in north-central Pennsylvania preserves evidence of significant climactic and evolutionary transitions, including the fin-to-limb transition and initial arborescence. The formation contains abundant sedimentary features, palynomorphs, trace fossils, and fish body fossils, making it crucial for reconstructing these paleoenvironments. However, integrated studies on the Lock Haven Formation are rare. This study characterizes the depositional environments, ichnology, paleontology, and age of the Lock Haven Formation. A recent exposure at the Insinger-Ward West Burlington Quarry reveals three middle to early late Famennian lithofacies associations (FAs). FA1 consists of red sandstone, shale, and mudstone containing rhizoliths (deeply penetrating …

Origins Of Musical Preferences: Infants' Responses To Sung Vocal Timbre, Hayley Leopold

Honors Theses

Understanding the origins of aesthetic preferences remains an important question in psychology, particularly in domains such as music where both biological constraints and cultural learning play important roles. While adults exhibit consistent preferences for certain musical features, including aspects of vocal quality or timbre, it remains unclear whether these preferences reflect early-developing perceptual biases or emerge through experience. The present study addresses this question by adopting a developmental paradigm previously used in the visual domain to examine whether infants’ responses to music align with adult aesthetic evaluations.

Twenty three infants between 8 and 12 months of age participated in a …

Imagined Afterlives: Anti-Black Medical Violences In Contemporary Black Arts, Katie Schadler

Honors Theses

“Imagined Afterlives: Anti-Black Medical Violences in Contemporary Black Arts” is a multi-genre exploration that studies the following works: Venus (1996) by Suzan Lori Parks, Get Out (2017) by Jordan Peele, and Dawn (1987) by Octavia Butler. I respectively study an experimental play, a psychological horror film, and a speculative novel to understand how Black creatives are depicting and responding to anti-Black violences, particularly medical violences. This work brings together Black art spanning from the late 1980s to 2017 as well as historical events and figures from the eighteenth century all the way to a not-so-distant future. While these works defamiliarize …

2026 Midamerica Gme Research Symposium, Hca Healthcare

MidAmerica Division GME Healthcare Symposium 2026

No abstract provided.

Atypical Del(5q) Mutation In Myelodysplastic Syndrome Presenting With Thrombocytopenia: A Case Report Of Tp53-Mutated High-Risk Biology, Shahzaib Maqbool, Munaf Siyamwala, Amelia Goslin, Shivani R. Scharf, Katsiaryna Laziuk

MidAmerica Division GME Healthcare Symposium 2026

No abstract provided.

A Study Of Adaptive Reuse Of A Decommissioned Golf Course Through A Nature-Based Approach: Woodhaven Golf Course, Fort Wort Texas., Justin B. Watson Mr.

Landscape Architecture Masters & Design Theses

Across the nation, golf courses are shutting down due to a lack of demand. Golf course developments began in the United States in the early 1950s During that era, demand for golf courses and housing was high. As golf’s popularity grew, developers saw golf courses in developments as high value-add amenities (Grooms, 2010). During the late 1990s and early 2000s, developers across the country raced to construct as many golf course communities as they could even as the number of golfers leveled out (Downey,2011).

Decommissioned golf courses across Texas are being underutilized as potential amenities for both the local community …