Digital Commons Network^™

The Utah Statesman, December 3, 2019, Utah State University

The Utah Statesman

Weekly student newspaper for Utah State University in Logan.

The C-Fern (Ceratopteris Richardii) Genome: Insights Into Plant Genome Evolution With The First Partial Homosporous Fern Genome Assembly, D. Blaine Marchant, Emily B. Sessa, Paul G. Wolf, Kweon Heo, W. Brad Barbazuk, Pamela S. Soltis, Douglas E. Soltis

Ecology Center Publications

Ferns are notorious for possessing large genomes and numerous chromosomes. Despite decades of speculation, the processes underlying the expansive genomes of ferns are unclear, largely due to the absence of a sequenced homosporous fern genome. The lack of this crucial resource has not only hindered investigations of evolutionary processes responsible for the unusual genome characteristics of homosporous ferns, but also impeded synthesis of genome evolution across land plants. Here, we used the model fern species Ceratopteris richardii to address the processes (e.g., polyploidy, spread of repeat elements) by which the large genomes and high chromosome numbers typical of homosporous ferns …

Cultivate Winter 2019/2020, Utah State University

Cultivate Magazine

Bi-annual magazine for the College of Agriculture and Applied Sciences.

Utah State Engineer, Fall 2019, College Of Engineering

College of Engineering Magazines

Annual magazine for the College of Engineering at Utah State University.

Parsing The Effects Of Demography, Climate And Management On Recurrent Brucellosis Outbreaks In Elk, Gavin C. Cotterill, Paul C. Cross, Jerod A. Merkle, Jared D. Rogerson, Brandon M. Scurlock, Johan T. Du Toit

Wildland Resources Faculty Publications

1. Zoonotic pathogens can harm human health and well‐being directly or by impacting livestock. Pathogens that spillover from wildlife can also impair conservation efforts if humans perceive wildlife as pests. Brucellosis, caused by the bacterium Brucella abortus, circulates in elk and bison herds of the Greater Yellowstone Ecosystem and poses a risk to cattle and humans. Our goal was to understand the relative effects of climatic drivers, host demography and management control programmes on disease dynamics.
2. Using >20 years of serologic, demographic and environmental data on brucellosis in elk, we built stochastic compartmental models to assess the influences of climate forcing, …

Sagestep News, Fall 2019, No. 35, Sagestep

Newsletters

Seasonal newsletter of SageSTEP.

Assessing & Protecting Dark Night Skies In El Morro National Monument, Leslie Kobinsky

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Light pollution is causing the disappearance of dark night skies around the world. In the United States alone, 1/3 of people are unable to see the Milky Way where they live (Ramlagan, 2016). National Park Service sites contain some of the darkest skies in the country. Here at El Morro National Monument, these dark skies are a beautiful and healthy benefit to people in the local community and visitors traveling from afar. El Morro’s current park legislation does not include specific measures of protection for the night sky. This capstone project will create a baseline data set of night sky …

Accessing Healthy Food: Behavioral And Environmental Determinants Among Low-Income Populations, Abiodun Tolulope Atoloye

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

On average, low-income individuals have poorer diet quality compared to their high-income counterparts. However, improved food access may offer opportunities to improve diet among this population. This study examines how the low-income population navigates between barriers, resources, and opportunities to acquire healthy foods in different settings.

Chapter 3 examined how the use of a farmers’ market incentive program among the low-income population impacts F&V consumption. We observed no effect on F&V consumption due to program participation but users of the program have a significantly higher F&V consumption than non-users. Chapter 4 identified transportation difficulties as a barrier to the uptake …

The Response Of Utah Lake's Plant And Algal Community Structure To Cultural Eutrophication, Leighton R. King

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Human activities have long had a negative impact on the water quality of freshwater lakes around the world. Utah Lake, located in north-central Utah, has been a subject of such impacts, as the lake experiences recurrent harmful algal blooms during the summer months. Lake warnings and closures have made the public increasingly aware of the ecological and economic impact of these blooms. The objectives of this study were to: 1) compare historical and present-day water quality and ecosystem conditions using environmental data contained in sediment cores, 2) identify whether, and when, Utah Lake transitioned from clearwater to turbid conditions, and …

Investigating The Roles Of Bacterial Endosymbionts In The Evolution Of Adelgidae (Hemiptera: Sternorrhyncha), Kathryn M. Weglarz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Insects form close partnerships, or symbioses, with bacteria. These partnerships allow the insects to use resources that would be unavailable to them otherwise. Certain insects, hemipterans, are able to feed on nutrient-poor plant-sap because these bacteria supplement their diets. While this association is beneficial for both the insect and bacteria, it also comes with consequences: the genomes of bacterial symbionts typically undergo extreme degradation, becoming small and lacking many genes necessary for typical bacterial functioning. In the Hemiptera, aphids, mealybugs, cicadas, true bugs, and their relatives, these bacterial partnerships tend to be stable over millions of years. However, adelgids (Aphidoidea: …

Herbage Characteristics Affecting Intake By Dairy Heifers Grazing Grass-Monoculture And Grass-Birdsfoot Trefoil Pastures, Marcus F. Rose

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Pasture-based dairies have become more prevalent in recent years due to a higher proportion of organic milk demand and production. Organic certification requires that animals must graze at least 120 days in each growing season. However, dry matter intake is often limited when dairy animals receive most of their herbage from pasture, resulting in lower animal performance and milk production. The purpose of this study was to analyze the complimentary effect of high energy grasses with birdsfoot trefoil (BFT) tannins to improve intake of dairy heifers. Jersey heifers were rotationally grazed for 105 days in 2017 and 2018 on eight …

Wildfire In The West: An Initial Analysis Of Wildfire Impacts On Hydrology And Riverbed Grain Size In Relation To Salmonid Habitat, Natalie J. Gillard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Historically wildfires have been beneficial to forests, however, human developments have encroached on forests when wildfire was artificially suppressed by federal and state agencies. The area burned by wildfire each year has increased twenty-fold in the past three decades. Large, high severity fires pose increased threats to human and aquatic communities within and downstream of the burned area due to post-wildfire effects on flooding and sedimentation. We need to understand the impacts of wildfires to be able to mitigate their damages and to recognize their potential benefits. This research addresses the questions: 1) Do wildfires impact rural and urban economies …

Expression Systems For Synthetic Spider Silk Protein Production, Michaela R. Hugie

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Spider silk is a biodegradable and biocompatible natural material that is stronger than steel and more elastic than nylon. These properties make spider silk a desirable material for many commercial products, ranging from textiles to biomedical materials. Due to spiders’ cannibalistic and territorial nature it is impossible to farm them to produce spider silk at a high enough yield to meet product demands. Therefore, a bioengineered synthetic process is necessary to produce spider silk. Synthetic spider silk has been produced in bacteria, goats, yeast, plants, mammalian cells and silkworms, but none of these processes provided a commercially viable yield or …

Parent Knowledge Of Autism Spectrum Disorder, Kandice J. Benallie

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Parent knowledge of ASD may be relevant to early identification and intervention services for children with ASD. By understanding how knowledgeable parents of young children are about ASD, researchers and practitioners can intervene and educate this population. This study sought to determine the knowledge base of ASD among parents with children five years and younger and if developmental, behavioral, and autism-related concerns predict knowledge of ASD. The sample of parents consisted of 167 mothers and fathers. All participants completed a knowledge questionnaire (i.e., ASKSG) and reported their level of developmental, behavioral, and autism-related concerns of their oldest child between the …

Effects Of Soil-Borne Pathogens On Seedling Establishment Patterns In Forest Systems, Eric P. Sodja

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Janzen-Connell mechanism is proposed to maintain plant diversity: predators and diseases of seeds reduce the number of seeds that survive near a parent tree, but allow seeds far from the parent tree to grow into adulthood. In the area where seeds don’t survive, seedlings from other tree species which are not affected by the seed consumer can grow. At large scales, this effect is thought to increase overall plant diversity. Soil-borne pathogens can contribute to seed mortality in this way, but we don’t know how important different parts of their lifecycle are in creating Janzen-Connell patterns. To determine the …

Assessing Beaver Dam Dynamics In The Logan-Little Bear Watershed, Connor Penrod

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

This paper seeks to address a knowledge gap concerning how flood events impact beaver dams over time. To address this gap, I took four time-snapshots of beaver dams, mapping them across the Utah portion of the Logan-Little Bear watershed, from 2009 to 2016 to bookend a large flood event in 2011. I assessed dam status (intact, breached, or blown out) for each dam mapped to assess the impact of the large spring runoff on the dam status. Assessing dam status over time allowed me to assess the change in condition over time, from before to several years after, while also …

Modeling Lake Temperature Response To Climate Change In The Alaskan Arctic, Thomas Balkcom

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

This thesis study focuses on simulating lake temperature and ice duration for four lakes at the Arctic Long-Term Ecological Research site, near the Toolik Field Station in Alaska. Model projections were driven by the representative global climate model outputs under different carbon emission scenarios. Results show that my simple lake model can reproduce historical lake temperature and ice duration observations, indicating the reliability of the model for future projections. Model projections show that JuneSeptember lake temperatures would increase by 4.3-5.8 °C from the historical period with most progressive carbon emission scenarios, but by 0.7-2.2 °C in the conservative scenarios. Results …

Preventing, Perceiving, And Post-Venting Suicide: A Guide For Teachers, For Their Students, Justin Vance

Undergraduate Honors Capstone Projects

To aid teachers with intense time constraints, the following summary includes the bolded, most important points in the paper:

• Thank you for caring about your students; by doing more than just teaching your content, you will change lives ... and may save some.

• Teachers are not responsible for student suicide; we carry enough responsibility already.

• Genuine, assertive communication of confidence and support fosters the safe environment needed.

• Improvements to how we view and speak about suicide can help reshape how young people think about it.

• As young men lose what they care about in pursuit …

The Role Of A Peer-Led Academic Intervention In College Students' Development Of Self-Regulated Learning: A Person-Centered Approach, Soojeong Jeong

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Due to its unsupervised nature, undergraduate education requires students to manage their own learning. They need to use self-regulated learning (SRL) strategies in order to achieve academic success. However, college students often have insufficient regulatory skills and strategies, suggesting the need for substantive and practical support. Supplemental Instruction (SI) is a well-recognized academic intervention that utilizes peer-led study groups for difficult college courses, through which students can develop their SRL abilities.

This study focuses on the role of the SI program in college students’ development of SRL from a person-centered perspective. First, this study examines the heterogeneous effects of the …

A Model Explaining Medusahead Invasion And Novel Targeted Grazing Approaches Of Control, Casey N. Spackman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Medusahead (Taeniatherum caput-medusae (L.) Nevski) is currently one of the biggest threats to rangelands and livestock operations in the Western US. High silica concentrations in medusahead contribute to its invasiveness. I developed a model to explain how silica is involved in the invasion process, and attempted to manipulate silica to increase use of the grass by livestock. Experiments were conducted to determine: 1) whether rotational grazing on established forages of improved nutritional quality would provide supplemental nutrients to increase cattle use of medusahead; 2) evaluate intake of and preference for medusahead treated with a glyphosate herbicide at different rates …

Evaluation Of A Proprietary Slow-Release Oxytocin Therapy And Return Of The Luteolytic Mechanism In Mares, Brendan Andrew Sarnecky

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Prolonging function of the corpus luteum (CL) is a method of suppressing estrus that maintains secretion of endogenous progesterone to keep mares out of heat naturally. The use of oxytocin to prolong CL function is becoming more popular. In these therapies, upregulation of cyclooxygenase-2 is inhibited, which impairs prostaglandin F2α ( PGF2α) production. Intramuscular (IM) administration of 60 IU of oxytocin once daily from 7 to 14 days after ovulation is currently the most common treatment protocol. Although that protocol is efficacious in ≥70% of treated mares, the need for daily administration is a drawback to its use. A proprietary …

The Influences Of Calculus I On Engineering Student Persistence, Amie Baisley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

About half of the students that are declared engineering majors end up leaving engineering within their first two years at the university. This happens following the required math and science courses that these students must take before getting into the technical engineering coursework. There are two systems that students must be a part of at the university to feel comfortable and have the desire to continue on in their degree. These include the academic system and the social system. The experiences engineering students have during their first required math course, Calculus I, is likely not promoting integration into these two …

Redefining Ceremony And The Sacred: Short Stories From The Dinétah, Stacie S. Denetsosie

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This is a creative thesis comprised of three short stories centered on the experiences of three Navajo protagonists living on the Navajo reservation. The short stories fit within the field of Native American Literature and highlight issues of mortality, sexuality, and ceremony. The stories illustrate the experiences of modern-day Navajo youth grappling to understand how to connect traditional knowledge with modernity. The three stories featured within this thesis are offered as a way to understand these challenges. Each protagonist is faced with an issue of morality, sexuality, or ceremony, and each reach differing conclusions about these topics within their lives. …

Relationship Maintenance Behaviors And Marital Stability In Remarriage: The Examination Of Stepfamily Constellations And Associated Challenges, Ron C. Bean

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research on stepfamily life in the 21^st century reveals unexplored variables at every turn. This is important because around half of American adults report close step-relationships and the challenges and demographic and relational differences for different types of stepfamilies remains unexplored. The first of these studies explored data for 879 husbands and wives couples to explore how positivity, negativity, and sexual interest levels differ depending which of the couple, both partners, or neither had previous children. Wives reported higher levels of marital instability and positivity than husbands. Marital instability was linked with one’s own and one’s partners’ negativity, and …

The Role Of Social Support In Dementia Care Facilities: Staff Member Perspectives, Malinda K. Dokos

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this study, certified nursing assistants (CNAs) who work regularly with long-term care residents with dementia were interviewed to investigate whether they considered providing social and emotional support to people with dementia an important part of their jobs. They were given an online survey, then each participated in an in-person interview that was recorded and later transcribed and analyzed for common themes. Through data analysis, I found that the participating CNAs unanimously considered social support to be an important aspect of caring for someone with dementia, and several personal values were associated with this perspective. They also reported the trainings …

Seeding Treatments To Enhance Seedling Performance Of The Bulrushes Bolboschoenus Maritimus, Schoenoplectus Acutus And S. Americanus In Wetland Restorations, David M. England

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A major goal in restoration is to reestablish native plant communities. There are several ways to reestablish species, but for large areas the most logistically feasible approach is to sow seed of desirable species. However, most wetland seeds are buoyant and are extremely difficult to establish in designated areas before floating away. In upland areas, tackifiers have been used to stabilize hill slopes from erosion and to keep seeds in place. The tackifier works as an adhesive that binds the seeds to the soil. However, the use of a tackifier has not been widely employed in wetland restorations, and prior …

Coaching Parents To Use Positive Behavior Support: Function-Based Interventions For Preschool Children With Challenging Behavior, Lauren E. Pace

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Parents who have children with challenging behavior may feel stressed, overwhelmed and at a loss for solutions. Challenging behavior can cause problems with children’s relationships with others and their school success. There are many resources for schools and children with special needs; however, resources for parents for young children (ages 3 to 5) with challenging behavior are limited. This study examined the impact of a 6-week intervention to coach parents to use strategies that encouraged children to develop skills that helped them to express frustration and solve problems in positive ways. Parents were better able to understand what the children …

Measuring The Self-Efficacy Of Students Participating In Vex Robotics Competitions, Joseph S. Furse

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Robotic competitions have become an increasingly popular educational tool to increase students’ interest and achievement in STEM. The largest and fastest growing of these is VEX Robotics Competitions (VRCs). Although millions of dollars of funding are allocated, and countless hours of effort are expended annually to provide students with the opportunity to compete in VRCs, little research has been done to investigate the educational impacts of participation in these competitions. One promising research framework in this area is to investigate the self-efficacy of students who participate in VRCs. Self-efficacy, or the beliefs one holds about one’s own abilities in a …

Enteric Methane And Nitrogen Emissions In Beef Cattle Grazing A Tannin-Containing Legume Relative To Feedlot And Traditional Pasture-Based Production Systems, Raúl David Guevara Ballesteros

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Beef cattle production is highly criticized because of the high use of land and water resources, and by the pollution (e.g., the gas methane in a cow’s breath and nitrogen in urine) produced by cows fed in feedlots. In contrast to feedlots diets and grasses, some plants (e.g., legumes) contain bioactive compounds (condensed tannins) that reduce pollution and enhance animal nutrition. In my research, I observed that cows grazing a tannin-containing legume (birdsfoot trefoil; BFT) had methane emissions similar to cows fed a feedlot ration with comparable weight gains. Cows in the BFT treatment gained more weight than cows grazing …

Exploring The Physiology And Evolution Of Hornworts, Tanner A. Robison

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Plants contain organelles called chloroplasts, which is where photosynthesis takes place. Chloroplasts also contain their own DNA, which is separate from the DNA in the nucleus. This DNA does not change much over evolutionary time, so it can be used to investigate relationships between organisms. Here we created a tool that makes it easier to analyze this chloroplast DNA as well making it easier to share complete chloroplast genomes on public databases. In addition, we also found a mobile element in the chloroplast DNA of a group of ferns, which appears to be driving structural changes in their genomes.