Digital Commons Network^™

Kelp Guardians Can Save The World: A Food Sovereignty Lab Report Of The Ghvtlh-K’Vsh Shu'-Srnelh-'I~ (Kelp Guardians) California Sea Grant, Delaney A. Schroeder-Echavarria

Cal Poly Humboldt theses and projects

As partners of the Ghvtlh-k’vsh Shu'-srnelh-'i~ (Kelp Guardians) California Sea Grant project, the Rou Dalagurr Food Sovereignty Lab and Traditional Ecological Knowledges Institute has actively engaged with local educators, Tribal organizations, and Tribal Nations to create youth-centered curricula, researched through a community-based participatory research lens. This is demonstrated through an innovative approach to recruiting and retaining Indigenous youth and community interest in coastal and marine ecosystems and resources by connecting with Indigenous cultural practices, Indigenous sciences, and community-based programs to encourage future careers. The Kelp Guardians project is led by the Tolowa Dee-ni’ Nation (TDN or Nation) and includes various …

Geographic Disparity And The Comparison Of Projectile Points In Central California, Robert Clark Newcomb

Cal Poly Humboldt theses and projects

The study of stone projectile point typology is not new. Many scholars have developed both similar and very different approaches to classifying various point types based on a wide variety of key morphological characteristics. The comparison of projectile point types and sizes from disparate regions, however, has not been widely examined. This research utilizes the classification systems of Noel Justice (Justice 2002a) and Brian Glenn (Glenn 1991) as a basis for comparing projectile point specimens from two disparate geographic regions. The first specimen collection comes from the Vandenberg Space Force Base region on the central coast of California and represents …

Student Housing Insecurity And Its Impacts On Academic Enthusiasm: A Multi-Method Analysis Of Cal Poly Humboldt, Aaron Gabriel Perez

Cal Poly Humboldt theses and projects

Cal Poly Humboldt has faced major challenges in the realm of housing due to a long history of shortages and difficulties in prioritizing the distribution of housing amongst the student population. Recent issues such as the mold infestations in Fall 2024 bring this into focus as the campus is also trying to expand its available housing through constructing new housing facilities. This in conjunction with the campus’ desire to continually increase its student population base year by year brings into question the fundamental goals of the campus and whether or not students feel the campus is helping or hurting them. …

Examining The Effects Of A Teaching Theory Of Mind Curriculum For Children With Autism Spectrum Disorder, Kayla Marie Hart

Cal Poly Humboldt theses and projects

Theory of Mind (ToM) is the ability to attribute mental states – thoughts, beliefs, and emotions – to oneself and others, and is critical for social understanding and interaction. Research has demonstrated that ToM development is linked to social competence, peer relationships, and emotional development in children, with notable differences observed between children with Autism Spectrum Disorder (ASD) and neurotypical peers. This study aims to examine the effectiveness of the Teaching Theory of Mind Curriculum (Ordetx, 2012) curriculum in improving ToM capabilities and social functioning in children with ASD and attention-deficit/hyperactivity disorder (ADHD). Participants, aged 7-17, underwent a 6-12 week …

Assessment Of The Genetic Population Structure And Extent Of Clonality In A Rare Serpentine Endemic, Lathyrus Biflorus T.W. Nelson & J.P. Nelson (Fabaceae), Using Ddrad Sequencing, Ashley Dickinson

Cal Poly Humboldt theses and projects

Lathyrus biflorus, or the two-flowered pea, is a rare herbaceous perennial restricted to a single population in Northern California. The species is considered critically imperiled but remains unprotected under state or federal endangered species acts. Despite its rarity, little is known about its life history, reproductive biology, or genetic diversity. Using genome-wide reduced representation sequencing, this study aimed to address these gaps by investigating the molecular evidence of clonality, the number and diversity of genets (unique genetic individuals which can be made up of one or many clonal units or ramets), and overall genetic health of the population. My …

Who Are We Restoring Maunalua For? Place Name Resurgence And Environmental Restoration In Maunalua, O‘Ahu, Cassidy J. Hollenbeck

Cal Poly Humboldt theses and projects

While numerous research studies have been published in recent decades on biological degradation and climate risks facing Maunalua, very few studies have centered on the sociopolitical dimensions of this region. By celebrating community pilina (intimacy, relationship) and biocultural restoration in Maunalua, this project aims to challenge the dominant narratives of degradation on this region. Centering Decolonizing and Kanaka ‘Ōiwi methodologies, this project builds on N. Ha‘alilo Solomon’s book chapter, Maunalua: Shifting Nomenclatures and the Reconfiguration of Space in Hawaii Kai (2022), celebrating ongoing projects of inoa ‘āina (place name) resurgence. Engaging snowball sampling in qualitative community-based participatory research methods, I …

The Impact Of Plant-Based Diets On Erythrocyte Function, Oxidative Stress, And Vascular Inflammation In Type 2 Diabetes Mellitus, Walter G. Craig

Cal Poly Humboldt theses and projects

Type 2 Diabetes Mellitus (T2DM) is a chronic metabolic disorder with diverse etiological contributors, characterized by insulin resistance, chronic inflammation, oxidative stress, and an increased risk of vascular complications. While much research has focused on plasma and serum markers of metabolic dysfunction, the role of erythrocytes in diabetic pathophysiology remains underexplored. This review examines the impact of dietary macronutrient composition, particularly plant-based diets, on erythrocyte function, oxidative stress, and vascular inflammation in T2DM. Red blood cells (RBCs) are not only oxygen carriers but also dynamic regulators of immune and inflammatory responses, with structural and functional alterations playing a critical role …

An Assessment Of The California Logging Workforce, Kendra Jean Gerstenberg

Cal Poly Humboldt theses and projects

There is limited literature describing the capacity and capabilities of the logging workforce in California. This study examines the logging workforce in California to quantify the number of logging crews, assess demographic diversity, and evaluate capacity and capabilities. The target population was California Licensed Timber Operators (LTOs) who have the legal right to harvest timber. A survey was developed and distributed to LTOs on the CAL FIRE database. Surveys were also distributed at regional logging conferences or collected by phone. Data were analyzed using Statistical Package for the Social Sciences (SPSS) and emergent coding for follow-up interviews was conducted. There …

"Gen Z Climate Being": Podcast Series On Youth, Climate Emotions, And Affective Climate Justice, Rachel Wynne Moszkowicz

Cal Poly Humboldt theses and projects

My project is a co-created 6 part podcast series with youth and the program lead from the Climate Mental Health Network’s Gen Z Advisory Board informed by affective climate justice, youth, mental health and education. This work foregrounds the embodied climate knowing and being of youth climate activists, offers ideas for a different relationship to climate change and climate education futures. In this podcast, Gen Zers speak to the youth mental health crisis as it relates to climate. My thesis project engages with and invites conversations that reflect the climate itself, which is non-linear, complex, porous, creative, expansive, and woven …

An Evaluation Of Fuel Model Accuracy And Multi-Scale Mitigation Strategies In The Wildland-Urban Interface Of Southern Humboldt County, Julia I. Cavalli

Cal Poly Humboldt theses and projects

Strategic placement of fuel treatments is critical for mitigating wildfire risk and reducing potential structure losses in wildland-urban interface (WUI) communities. As wildfire activity accelerates across the western United States, the need to identify high-impact fuel treatment locations grows increasingly urgent. Concurrently, housing development in the WUI is expanding, intensifying the exposure of homes and infrastructure to wildfire threats. In response, many communities are looking to mitigate the likelihood and severity of losses during wildfire events. The success of these efforts depends, in part, on robust data to support strategic placement of effective treatments that reduce fuel availability.

This study …

A Review Of Contact Dependent Interactions Among Encrusting Bryozoans, Sheena Emily Stephens-Norton

Cal Poly Humboldt theses and projects

This review of published literature is focused on bryozoan interactions and discusses overgrowths, “stalemates,” erect bi-laminate growths and fusions. Overgrowths, where one colony grows zooids atop another, have received the most attention in the scientific literature. Stalemates, where two colonies cease growth at the region of contact, have received relatively little research investigating the possible reasons for its occurrence. Erect, bi-laminate growth, following inter- and/or intraspecific contact between colonies, has also received little research, but could reflect mutualistic behavior of encrusting species to increase feeding and reproduction. Fusion of self-self-contacts appears common, yet non-self-fusions to form natural chimeras may also …

Groundwater Pumping Impacts On Stream Depletion In Humboldt County, Ca: Integrating Analytical Models And Field Data, Andy Hans Heise

Cal Poly Humboldt theses and projects

This study addresses the significant concern of stream depletion from groundwater pumping in Humboldt County, CA. The objective of this study is to develop an analytical model for estimating stream depletion and integrating field data into model parameters.

The methodology involved conducting a field study near three operating wells by a stream, installing stream gages upstream and downstream of the wells, and recording pumping rates and schedules for two of the wells. The third well’s pumping data was synthetically generated, for privacy concerns of the well owner. The StreamDepletR package was used for estimating depletion rates in a stream in …

Twice-Exceptionalism And The Complexity Of Supporting Students Who Are Both Gifted And Disabled, River Johnathon Taylor

Cal Poly Humboldt theses and projects

Drawing on ideas from disabilities studies about compulsory able-bodiedness as well as experiences of disability being fluid and context dependent, this study posits that giftedness, just like disability, is a complex multidimensional form of identity that is both context and temporally dependent. Twice-exceptionalism is defined as an identity in which an individual is gifted in at least one domain of human productivity and manifests at least one disability. Students with unique learning needs (students with disabilities, students with giftedness, and students with twice-exceptionalism) face many complex challenges within Humboldt County, California. Twenty-five educators from Humboldt County working across all grade …

Exploring Coastal Spaces Of Tribal Sovereignty And Self-Determination In Ancestral Waters Proposed For Offshore Wind Development, Alyssa Suarez

Cal Poly Humboldt theses and projects

Proposed offshore wind development off California’s North Coast raises novel questions about Tribal sovereignty offshore. This project specifically engages claims, assuming the Yurok Tribe’s framing that offshore wind development poses a coastal hazard. The research followed a co-production framework. The research questions were co-designed with the Yurok Tribe and the research itself governed by a Data Sharing Agreement. The work presents findings from 13 semi-structured interviews with individuals and experts navigating sovereignty in the offshore wind space, including government representatives; lawyers; legal researchers; academics; foundation staff; journalists; and Humboldt Bay community members. Participants identified several key tensions surrounding claims of …

Patterns Of Tree Damage And Fuels Around Powerlines In Northern California, Zoe J. Ziegler

Cal Poly Humboldt theses and projects

Rural powerlines are critical for delivering electricity to communities far from urban areas but present a significant hazard when located in forested regions. During strong wind events, tree failure (i.e., broken branches, snapped stems, and windthrow) can bring combustible material in contact with high-voltage lines, causing electrical outages or setting fire to vegetation below the powerline. Additionally, elevated forest fuel loading can increase wildfire rate of spread and intensity, potentially increasing negative ecosystem impacts and decreasing containment capacity during powerline- ignited wildfires. The risks associated with rural electrical infrastructure, tree failure, and elevated fuel loading emphasize the need for improved …

Home Range, Habitat Use, And Fall Migration Of Lewis’S Woodpeckers In The Eastern Cascade Range, Oregon, Cameron Piper

Cal Poly Humboldt theses and projects

Lewis’s woodpecker (Melanerpes lewis), a burn specialist, is experiencing range-wide population declines despite increasing fire activity in the western U.S. The White River Wildlife Area in Oregon hosts the state's only year-round population, raising questions about their breeding, habitat use, and migration. In summer 2024, we tracked nine woodpeckers using telemetry to estimate home range size and overlap. Full home ranges averaged 428 ha, with 66 ha core areas, and showed evidence of growing after nesting. Home ranges overlapped extensively (Full: 91 ± 13%; Core: 63 ± 29%), though individuals had distinct areas of intense use. Males had …

The Masa That Holds Us: Indigenous Epistemologies And The Food We Share, Necahual Gamboa

Cal Poly Humboldt theses and projects

The U.S. higher education system is built on histories and infrastructures of colonization, white supremacy, and western imperialism. Among many of the institutions produced from a history of domination and genocide, the systems of higher education need to shift their focus to decolonial frameworks including Indigenous epistemologies (ways of knowing and being) in order to work toward true reparations between these imperial systems and the Indigenous people they have displaced and disregarded. This project brings these systems into question, but also uses art, prose, and storytelling to better align with what it means or what it could look like to …

Testosterone Reactivity And Parental Care Motivation In Men As A Function Of Parental Status, Nathan Boone

Cal Poly Humboldt theses and projects

Paternal investment and caregiving quality have lasting impacts on children's well-being. Children with sensitive, involved fathers typically develop more secure attachments and have fewer behavioral and psychological problems than children with less sensitive and involved fathers. While the importance of fathers’ engagement with their children is well established, the biological mechanisms that underpin paternal behavior are not fully understood. Previous research has found that baseline testosterone levels and testosterone reactivity to infant stimuli are both relevant predictors of paternal sensitivity. Short-term decreases in testosterone in nurturant contexts, and short-term increases in testosterone in challenging contexts have both been linked to …

Can We Help Coast Redwood Adapt To Climate Change? A Provenance Study On Genetic Variation And Climate Transfer Distance, Aidan J. Murphy

Cal Poly Humboldt theses and projects

The climate is changing more rapidly than many species can adapt or migrate. Coast redwood (Sequoia sempervirens) is a unique, long-lived conifer and remains California’s most valuable and economically important timber species. The species is threatened in its natural range due to anthropogenic climate change and human activity. Redwood favors asexual reproduction which restricts its ability to migrate naturally. The consequences of asexual reproduction when faced with a rapidly changing climate may make some form of assisted migration necessary for long-lived organisms like redwood.

This study evaluates drivers of variation in redwood growth and the influence of climate …

The Menstrual Cycle, Dual-Hormone Hypothesis, And Competition: Implications For Athletic Performance, Camille Burns

Cal Poly Humboldt theses and projects

Female athletes perceive that the fluctuating hormones of the menstrual cycle affect their performance. However, research on objective performance is inconclusive, partly due to a lack of studies conducted in real-world competitive contexts. Testosterone is often seen to be elevated near ovulation and is related to social competitiveness. Under the dual-hormone hypothesis, testosterone only predicts competitive behavior when cortisol is low. The current study had two goals: (1) to test whether the dual-hormone hypothesis applied to competitive drive and objective athletic performance, and (2) to examine whether competitiveness and the intensity of one’s response to competition varied across the menstrual …

Uncertainty Reduction As An Underlying Motive For Optimal Distinctiveness, Chad Hinojosa

Cal Poly Humboldt theses and projects

Uncertainty-identity theory and optimal distinctiveness theory posit separate but related motives for social identity. Whereas there has been evidence supporting each theory, little research has investigated the overlap between the two. More specifically, the needs for assimilation (belonging) and differentiation (uniqueness) as postulated by the optimal distinctiveness model may be understood as derivatives of the desire to reduce uncertainty in one’s self and future. In this study, I investigated the overlap between these three motives for social identity by experimentally testing the mediating effect of self-uncertainty on the relationship between the needs posited by optimal distinctiveness and social identity. Participants …

Effects Of Teacher Reinforcements On Student Outcomes In Adapted Physical Education: A Meta-Analysis, Yaxeny Moreno

Cal Poly Humboldt theses and projects

The primary goal is to review the influence of reinforcement strategies in Physical Education (PE) and Adapted Physical Education (APE) settings, focusing on students with disabilities with the ages of 3-22. Reinforcement strategies, such as positive reinforcement/feedback, token economies, verbal praise, tangible rewards, and additional strategies are essential for fostering engagement and skill development. Literature has provided evidence and results to highlight the importance of applying evidence-based reinforcement strategies to which support the behavioral, social, and physical development of students in both Physical Education and Adapted P.E. settings. The purpose of this study was to review and analyze existing literature …

Community Assembly Across Environmental Gradients: Contrasting Patterns Of Funtional Convergence And Divergence In California Coastal Grasslands, Ernesto Chavez- Velasco

Cal Poly Humboldt theses and projects

Elucidating how plant community assembly processes interact across spatial scales to shape ecosystem function remains a central challenge in ecology. These processes are often hierarchical, with broad scale environmental filters constraining the composition of local communities. I investigated these hierarchical processes across three California coastal grassland sites spanning a ~1000 km gradient. At these sites, I measured community composition, standing biomass, four functional traits (plant height, specific leaf area, leaf dry matter content, and leaf lobedness), and estimated species’ environmental niches. To identify assembly mechanisms, I used null models to assess functional convergence or divergence and scaled these patterns with …

Lineation To Liberation: The Transformative Power Of Poetic Rhetoric, Amber Rae Alvarez

Cal Poly Humboldt theses and projects

This project explores the transformative power of poetic rhetoric and examines how poetry as a form of expressive art serves as a means of reclamation in the aftermath of encounters with the American criminal justice system. I contend that poetry provides a space where folks can reimagine (and reclaim) their identities, asserting their agency in empowering and authentic ways. Taking a Cultural Studies and Critical Prison Studies informed approach, this project engages the concept of lineation to liberation to conduct a close reading analysis of artist (Reginald) Dwayne Betts’ poetry. Betts’ work not only provides a powerful example of how …

From Spark To Wildfire: Predicting Wildfire Origins And The Efficacy Of “Fire Safe” Cigarettes In California Grasslands, Trevor Blackwell Haltermann

Cal Poly Humboldt theses and projects

As wildfires in North America increase in size and frequency, the societal impacts become greater as well. With greater risk and high fire suppression costs it is pertinent to improve fire investigation methods and limit the potential for human caused ignitions. Two distinct studies were carried out to assess the accuracy of fire pattern indicators and the efficacy of “fire safe” cigarette technology in lowland grass fuel types in California. The first study utilized 24 experimental small-scale fires within a wind tunnel to examine the accuracy of microscale fire pattern indicators and the factors that influence the accuracy of predictions …

Impacts Of Autistic Traits On Student Evaluations Of Professors, Matias Solorzano

Cal Poly Humboldt theses and projects

Instructor evaluations are critical to the tenure process in academia, but are biased against autistic individuals in academic settings. This study addresses how instructor evaluations are impacted by the gender of the professor, whether the instructor discloses their autism identity, and the gender of the student evaluator in a 2 Professor Gender (Male or Female) x 2 Autism Identity (Disclosed v. Not Disclosed) x 2 Student Gender (Male or Female) between-subjects design. It was hypothesized that male professors will be rated higher than female professors, that disclosing one’s autism identity leads to higher evaluations than non disclosure, and that female …

An Analysis Of Uv Disinfection Of Municipal Wastewater Following Natural Treatment Systems, Jonathan Andrew Kirchubel

Cal Poly Humboldt theses and projects

On January 30, 2024, the City of Arcata replaced chlorine with ultraviolet (UV) irradiation as its disinfection method for treating its wastewater prior to discharging to Humboldt Bay. The Arcata wastewater treatment facility (AWTF) utilizes natural treatment systems for treating its secondary effluent, which can provide issues for UV disinfection through variance in turbidity, total suspended solids (TSS), pH, humic acids, and color. This project aimed to identify whether the water quality characteristics of natural treatment systems in the AWTF would impact UV disinfection of municipal wastewater.

Thirty-one sampling periods occurred between June 8, 2024, and March 1, 2025, recording …

Effects Of Teacher Reinforcements On Student Outcomes In Adapted Physical Education: A Systematic Review, Juliana Jamison-Espinoza

Cal Poly Humboldt theses and projects

This systematic review examined the effectiveness of various reinforcement strategies on student outcomes in adapted physical education (APE) settings for individuals with disabilities. A comprehensive literature search spanning from 1979 to 2024 across six databases identified 18 studies meeting inclusion criteria, involving 140 participants aged 3–22 with diverse physical and cognitive disabilities. Reinforcement strategies evaluated included token economies, verbal praise, tangible rewards, and alternative techniques such as video modeling and peer-mediated interventions. Outcomes measured were categorized into affective states, behavioral improvements, and cognitive gains. Results showed mixed effectiveness across studies: while 7 of the 18 studies reported significant improvements in …

Evaluating The Effects Of Memory Aids On Conversational Behaviors In Older Adults With Cognitive Decline And Their Caregivers, Sarah B. Romero Pavon

Cal Poly Humboldt theses and projects

As the baby boomer generation (individuals born between 1946 and 1964) continues to age into late adulthood, the need for resources and care related to aging is in high demand. Age-related neurocognitive decline (NCD) is broadly characterized by a gradual decrease in one’s ability to think, remember, and reason. Loss of speech and coherent conversation is a common challenge for older adults with neurocognitive decline, often marked by an increase in nonspecific pronoun use, frequent and sudden shifts in topic, and repetition, which can lead to a decrease in activity engagement, less social interaction with peers, and social isolation. Memory …

Patterns Of Kinship And Sociality In North American River Otters, Whitney E. Vickers

Cal Poly Humboldt theses and projects

Previous studies of river otters (Lontra canadensis) in coastal Humboldt County, California have documented varying social group compositions over the last four decades. It has been assumed that otters travel between coastal wetland sites, but the extent of movement has been unknown. Socially, river otters have been observed alone, in small family groups that consisted of an otter mom and pup(s), in larger helper groups that consisted of an otter mom, pup(s), and at least one additional adult or juvenile (helpers), and in all-adult social groups. Until now it was unknown whether the composition of social groups was …