Digital Commons Network^™

Precipitation Impact On Crop Yield, Ian Ritchie

Department of Environmental Studies: Undergraduate Student Theses

Climate change is a massive force impacting and changing many weather trends, including precipitation rates. This thesis will study the relationship between crop yield and changes in precipitation. Understanding crop yield is important in determining overall crop supply every year as well as crop prices. Many factors can have either a negative or a positive impact on crop yields. One of these many factors is precipitation. This thesis looks directly at the impacts of changes in precipitation on corn yield in Iowa from 1991-2020. To do this, a regression analysis was performed to compare changes in yearly precipitation rates for …

Effects Of Land Use In Nebraska On Insect Biodiversity And Eastern Monarch Populations, Carina Olivetti

Department of Environmental Studies: Undergraduate Student Theses

How are Nebraska land use decisions affecting eastern monarch butterfly decline? What are the driving factors causing monarch decline? What are the challenges of insect monitoring and data organizing? The purpose of this exploratory research project was to investigate these questions and simultaneously illustrate the importance of insect biodiversity, focusing largely on the monarch butterfly. The eastern population of the monarch butterfly has declined 80% over the past two decades. The state of Nebraska lies within their migratory path and is therefore critical to their survival. The hypothesis is that monarch populations are declining because of the combined impacts of …

Overview Of The Insect Food And Feed Industry, Daniel J. Seckman

Department of Entomology: Distance Master of Science Projects

The entomophagy field is one that when you immerse yourself in it, you will feel like the entire world is talking about insects as food and feed. Yet, from the outside, the industry is virtually nonexistent. In the United States, the North American Coalition for Insect Agriculture (NACIA) is the leading organization dedicated to growing the insect food and feed sector. While the organization has grown extensively in recent years, most individuals in the food, feed, and entomological industry have never heard of the organization. The Wall Street Journal presents the annual Food Forum, which aims to “tackle the critical …

Mosquitoes Of Wisconsin: The Biology, Life History, Identification And Control, Timothy Wucherer

Department of Entomology: Distance Master of Science Projects

In the past 60 years, weather in Wisconsin has generally been getting warmer, and in many areas of the state, wetter (Moran et al., 2015). Long-term analysis of Wisconsin’s climate has indicated an increase in average annual precipitation, longer growing seasons, and an increase in average temperatures (Moran et al., 2015). Increases in temperatures and rain have been directly correlated with increases in vector-borne diseases such as pathogens carried by mosquitoes (Moran et al., 2015). With this, Wisconsin communities should prepare for possible increases in mosquito activity and the health and veterinary concerns that come with direct exposure to certain …

Butterfly Life Cycle: Curriculum, Lesson Plans And Resources, Matthew D. Trujillo

Department of Entomology: Distance Master of Science Projects

This curriculum and guide contains lessons, each with exercises and activities, a science-based word bank and glossary, and Missouri content standards and descriptions. This is a centers-based curriculum intended to be used in conjunction with a science center such as the Butterfly Palace or Butterfly House. There are three major themes in this curriculum: The Life Cycle of Butterflies, Butterfly Habitats, and Adaptations for the Units. This curriculum is unique in that each lesson can serve as a stand alone which can be taught in a classroom whether home based, or school based and does not require sequencing with the …

Bedbug Education, Treatment, And Prevention, Elizabeth Bedford

Department of Entomology: Distance Master of Science Projects

Cimex lectularius (bedbug) has become a severe issue in more recent years due to travel, immigration, and importation of products. Unfortunately, most people do not know their biology hence do not treat these arthropods correctly. Many myths and misinformation are currently available to people on the internet and with pest professionals. Education and proper treatment must eradicate these pests in homes, commercial buildings, and other places. To prove whether or not education with treatment garners better results,ten homes were treated with the same heating and chemical process, with only five being educated before, during and after. All homes were inspected …

The Relationship Between Bodyweight Status And Weight Perception Explains Differences In Calories Ordered In A Food Choice Exercise, Jean-Claude Mbarushimana, Christopher Gustafson, Henriette Gitungwa, Eliana Zeballos

Department of Agricultural Economics: Faculty Publications

Understanding food choice is critical to be able to address the rise in obesity rates around the globe. In this paper, we examine the relationship between measured (BMI, using self-reported height and weight) and perceived weight status with the number of calories ordered in a controlled online food choice exercise. A total of 1044 participants completed an online food choice exercise in which they selected ingredients for a sandwich from five categories: meat/protein, cheese, spread/dressing, bread, and vegetables. We examine the number of calories ordered by participants and use linear regression to study the relationship of BMI category relative to …

Evolution Of Three Streambanks Before And After Stabilization And Record Flooding, Matthew Russell, Aaron R. Mittelstet, Tiffany Messer, Jesse T. Korus, R.M. Joeckel

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Stabilization projects are increasingly used to mitigate the effects of anthropogenic streambank erosion, yet the effectiveness of stabilization has been insufficiently measured. Sound monitoring practices inform adjustments in implementation and maintenance, which improve engineered effectiveness. Thus, the objectives of this study were to: 1) measure streambank migration from in three reaches stabilized with wooden jetties following a major flooding event, and 2) quantify deposition around the jetties between pre-flood and post-flood. Streambank deposition was measured in 2019 with a River Surveyor and Global Positioning System (GPS). Bank erosion rates in Reaches 1, 2 and 3 were 0.41, 0.96 and 0.07 …

Censored Data Considerations And Analytical Approaches For Salivary Bioscience Data, Hedyeh Ahmadi, Douglas A. Granger, Katrina R. Hamilton, Clancy Blair, Jenna L. Riis

Department of Psychology: Faculty Publications

Left censoring in salivary bioscience data occurs when salivary analyte determinations fall below the lower limit of an assay’s measurement range. Conventional statistical approaches for addressing censored values (i.e., recoding as missing, substituting or extrapolating values) may introduce systematic bias. While specialized censored data statistical approaches (i.e., Maximum Likelihood Estimation, Regression on Ordered Statistics, Kaplan-Meier, and general Tobit regression) are available, these methods are rarely implemented in biobehavioral studies that examine salivary biomeasures, and their application to salivary data analysis may be hindered by their sensitivity to skewed data distributions, outliers, and sample size. This study compares descriptive statistics, correlation …

Factors Associated With Smoking In Low-Income Persons With And Without Chronic Illness, Monique T. Cano, David L. Pennington, Sara Reyes, Blanca S. Pineda, Jazmin Llamas, Vyjeyanthi S. Periyakoil, Ricardo F. Muñoz

Department of Psychology: Faculty Publications

INTRODUCTION Tobacco disparities persist among low-income smokers who seek care from safety-net clinics. Many of these patients suffer from chronic illnesses (CILs) that are associated with and exacerbated by smoking. The objective of the current study was to examine the differences between safety-net patients with and without CILs in terms of nicotine dependence and related factors (such as depression, anxiety) and self-efficacy regarding ability to abstain from smoking. METHODS Sixty-four low-income smokers who thought about or intended to quit smoking were recruited from the San Francisco Health Network (SFHN) and assessed for CILs, nicotine dependence, depression, anxiety, and smoking abstinence …

A Comprehensive Study To Delineate The Role Of An Extracellular Vesicle-Associated Microrna-29a In Chronic Methamphetamine Use Disorder, Subhash Chand, Austin Gowen, Mason Savine, Dalia Moore, Alexander Clark, Wendy Huynh, Niming Wu, Katherine Odegaard, Lucas Weyrich, Rick A. Bevins, Howard S. Fox, Gurudutt Pendyala, Sowmya V. Yelamanchili

Department of Psychology: Faculty Publications

Extracellular vesicles (EVs), which express a repertoire of cargo molecules (cf. proteins, microRNA, lipids, etc.), have been garnering a prominent role in the modulation of several cellular processes. Here, using both non-human primate and rodent model systems, we provide evidence that brain-derived EV (BDE) miRNA, miR- 29a-3p (mir-29a), is significantly increased during chronic methamphetamine (MA) exposure. Further, miR-29a levels show significant increase both with drug-seeking and reinstatement in a rat MA self-administration model. We also show that EVassociated miR-29a is enriched in EV pool comprising of small EVs and exomeres and further plays a critical role in MA-induced inflammation and …

A New Tool For Equating Lexical Stimuli Across Experimental Conditions, Evan N. Lintz, Phui Cheng Lim, Matthew R. Johnson

Department of Psychology: Faculty Publications

In cognitive psychology and psycholinguistics, lexical characteristics can drive large effects, which can create confounds when word stimuli are intended to be unrelated to the effect of interest. Thus, it is critical to control for these potential confounds. As an alternative to randomly assigning word bank items to stimulus lists, we present LIBRA (Lexical Item Balancing & Resampling Algorithm), a MATLAB-based toolbox for quickly generating stimulus lists of user-determined length and number that can be closely equated on any number of lexical properties. The toolbox comprises two scripts: a genetic algorithm that performs the inter-list balancing, and a tool for …

Does Self-Objectification Entail An Opposition Between Appearance And Competence? The Likert Version Of The Self-Objectification Questionnaire (Lsoq), Robin Wollast, Oliver Klein, Dawn M. Vanleeuwen, Sarah J. Gervais, Philippe Bernard

Department of Psychology: Faculty Publications

We propose a new method to test the reliability of Fredrickson et al.’s self-objectification questionnaire (SOQ). This scale being based on a ranking, traditional reliability estimates are inappropriate. Based on generalizability theory, we suggest to compute the reliability of each subset of questions related to physical appearance vs. physical competence separately in order to average them. We applied this method to a sample of female US undergraduates (n = 395) and evidenced that the reliability of the scale is very low (corrected Cronbach’s alpha = .31). We also noted that a large proportion of the sample (32%) failed to …

An Examination Of The Relations Between Emotion Dysregulation, Dissociation, And Self-Injury Among Dissociative Disorder Patients, M. Shae Nester, Bethany L. Brand, Hugo J. Schielke, Shaina Kumar

Department of Psychology: Faculty Publications

Background: Dissociative disorder (DD) patients report high rates of self-injury. Previous studies have found dissociation and self-injury to be related to emotional distress. To the best of our knowledge, however, the link between emotion dysregulation and self-injury has not yet been examined within a DD population. Objective: The present study investigated relations between emotion dysregulation, dissociation, and self-injury in DD patients, and explored patterns of emotion dysregulation difficulties among DD patients with and without recent histories of self-injury. Method: We utilized linear and logistic regressions and t-test statistical methods to examine data from 235 patient-clinician dyads enrolled …

Preventing Adverse Childhood Experiences Among Sexual And Gender Minority Youth: A Call To Action, Katie M. Edwards, Jillian R. Scheer, Heather Littleton, Natira Mullet

Department of Psychology: Faculty Publications

No abstract provided.

Making Sense Of Schooling During Covid-19: Crisis As Opportunity In Korean Schools, Taeyeon Kim, Sunbin Lim, Minseok Yang, Soo Jung Park

Department of Educational Administration: Faculty Publications

This article explores how policy actors in South Korea understand and make meaning of school-related policies responding to COVID-19. Using sensemaking and crisis theory as a framework and informed by literature on policy culture, we analyzed qualitative data collected from interviews with teachers, educational leaders, and parents. The findings show that our participants initially thought the crisis situation would “just pass,” but they experienced “fear” and “chaos” when online and hybrid classes were implemented. After adopting unexpected policy changes to cope with the spread ofCOVID-19, participants sought shared responsibility to overcomethe crisis. In addition, our participantsmademeaning of the crisis as …

Association Between Sleep Quality And Dorsal Default Mode Network In College Students, Anna Klets

College of Education and Human Sciences: Dissertations, Theses, and Student Research

College students often have poor sleep quality, which may change resting state functional connectivity network in the brain. Prior research demonstrated that sleep is associated with structural and functional changes in some specific brain subareas, which are involved in the dorsal default mode network (dDMN). However, no study to date has comprehensively examined all possible individual pairs of functional connectivity in the dDMN in relation to sleep quality among college students. Therefore, the present study hypothesized that sleep quality in college students was linked to any resting state functional connectivity in the dDMN.

Forty nine college students (25 females) underwent …

Protective Factors Against Dating Violence Perpetration And Victimization, Meagan Kunitzer

Department of Sociology: Dissertations, Theses, and Student Research

Dating violence is a prominent problem among college students that can result in harmful physical and mental health outcomes. To date, much research has focused on risk factors, but less is known about protective factors that may decrease the likelihood of dating violence. As such, the current paper examines protective factors (e.g. religion, positive parental relationships) against perpetrating and/or experiencing dating violence and whether these protective factors operate similarly for both perpetration and victimization. Data were gathered in 2013-2014 at two large public universities using pencil and paper surveys (N = 1482). Bivariate results revealed that women have more protective …

Housework: Socialization Influences On Individual Performance, Couple Division Of Labor And Mental Health, Jaala Robinson

Department of Sociology: Dissertations, Theses, and Student Research

Despite the continued gender inequality in the division of housework, little research has considered how family housework socialization influences the amount of housework a person performs and their mental health. Socialization processes occur via the amount of housework performed in the home during childhood by each parent and the parents’ gender division of household labor. This analysis details three studies that explore the impact of socialization to housework. All three studies take advantage of intergenerational data from the Panel Study of Income Dynamics (PSID). The first study uses a social learning framework to test whether the amount of housework a …

Individual Differences In Social Responsiveness, Social Experiences, And Oxytocin System Genetic Variation In Depression Symptom Severity, Grace Sullivan

Department of Psychology: Dissertations, Theses, and Student Research

Social experiences including discrimination, low social support, and interpersonal conflict are reliable predictors of depression symptom severity (Costello, 1982; Monroe, Rohde, Seeley, & Lewinsohn, 1999; Phifer & Murrell, 1986). However, individual differences may buffer against or exacerbate risk (Pluess & Belsky, 2015). A more holistic and dimensional approach, in line with modern perspectives on mental health (Kircanski, LeMoult, Ordaz, & Gotlib, 2017), requires an investigation of individual differences that moderate associations of positive and negative social experiences with depression symptom severity. This dissertation assesses relative contributions of social experiences (low social support, discrimination, childhood trauma, and sexual objectification) to variation …

Growth Perspectives In Tree Campus Higher Education And Tree City Usa, Olivia Coffey, Logan Lewis, Michael Schneider, Mason Ellis, Austin Vandersteen, Nicholas Lennon

Honors Program: Senior Projects (Public)

With an aggressive goal of 25% growth in both the Tree City USA and Tree Campus Higher Education programs, the Arbor Day Foundation (“ADF”, “Arbor Day”) needs a correspondingly bold plan to follow. Our group’s set of recommendations keep in step with ADF’s goals of inspiring people to Plant, Nurture, and Celebrate trees. Adopting ADF’s guiding principles informed and refined our recommendations. Our suggestions to ADF are to expand and refine marketing objectives, make use of communication platforms, streamline the survey and application procedure, and restructure the Tree City participation incentive programs. The subsections of this report provide greater detail …

Experiential Learning In Soil Science: Evaluating Soil Quality In South Wollo, Ethiopia, Melissa Allen, Martha Mamo, Shimelis Beyene, Teshome Regassa, Gandura O. Abagandura, Solomon Abreha, Anthony James Mucia, Tsegaye Tadesse

National Drought Mitigation Center: Faculty Publications

This study abroad program provided an opportunity to enhance the international experience and research skills of University of Nebraska-Lincoln (UNL) students within a multidisciplinary team’s research-education goal on improving food security in Ethiopia. The experiential study component of the project included preparatory sessions during the Fall 2015 Semester at the UNL followed by a four- to five-week fieldwork experience in Ethiopia. Teams from the UNL and an Ethiopian university participated in survey data collection and field soil evaluations from farms in the Gerado area of South Wollo, Ethiopia. Having students interact with farmers increased student self-confidence and enhanced their leadership …

(Non)Religious Coping With A Natural Disaster In A Rural U.S. Community, Dena Abbott, Andrew Franks, Corey Cook, Caitlin Mercier

Department of Educational Psychology: Faculty Publications

Religious/spiritual (R/S) coping following natural disasters is associated with positive outcomes, leading to perceptions that the absence of R/S coping leads to negative outcomes among nonreligious individuals. However, little research explicitly explores the coping strategies of nonreligious individuals in response to natural disasters and traumatic events. The present study collected data from a sample of survivors of a natural disaster event (i.e., a tornado) to test the relationship between (non)religiosity/(non)spirituality, coping, psychological distress, and posttraumatic growth. Statistical models suggested that problem-focused coping facilitated posttraumatic growth and lower levels of psychological distress among people with lower levels of institutional religiousness and/or …

Horn Fly (Diptera: Muscidae) - Biology, Management, And Future Research Directions, Gary Brewer, Dave J. Boxler, Luisa D. Domingues, Rebecca T. Trout Fryxell, Chris Holderman, Kelly M. Loftin, Erika Machtinger, Brandon Smythe, Justin L. Talley, Wes Watson

Department of Entomology: Faculty Publications

The horn fly, Haematobia irritans irritans (L.), is one of the most important external parasites of cattle in North America and elsewhere. Horn fly adults have an intimate association with cattle, their primary host. With their often-high numbers and by feeding up to 38 times per day per fly, horn flies stress cattle. The resulting productivity loss is valued at more than 2.3 billion USD in the United States. Insecticides are commonly used to mitigate direct injury from feeding and indirect injury from disease transmission. This paper discusses horn fly biology, distribution, and management. Emphasis is on promising new approaches …

Toxicological Analysis Of Stilbenes Against The Fall Armyworm, Spodoptera Frugiperda, Sarah E. Mccomic, Leslie C. Rault, Troy D. Anderson, Daniel R. Swale

Department of Entomology: Faculty Publications

The fall armyworm (FAW), Spodoptera frugiperda, is a global pest of multiple economically important row crops and the development of resistance to commercially available insecticidal classes has inhibited FAW control. Thus, there is a need to identify chemical scaffolds that can provide inspiration for the development of novel insecticides for FAW management. This study aimed to assess the sensitivity of central neurons and susceptibility of FAW to chloride channel modulators to establish a platform for repurposing existing insecticides or designing new chemicals capable of controlling FAW. Potency of select chloride channel modulators were initially studied against FAW central neuron …

Technological Advances To Address Current Issues In Entomology: 2020 Student Debates, Lina Bernaola, Molly Darlington, Kadie Britt, Patricia Prade, Morgan Roth, Adrian Pekarcik, Michelle Boone, Dylan Ricke, Anh Tran, Joanie King, Kelly Carruthers, Morgan Thompson, John J. Ternest, Sarah E. Anderson, Scott W. Gula, Kayleigh C. Hauri, Jacob R. Pecenka, Sajjan Grover, Heena Puri, Surabhi Gupta Vakil

Department of Entomology: Faculty Publications

The 2020 Student Debates of the Entomological Society of America (ESA) were live-streamed during the Virtual Annual Meeting to debate current, prominent entomological issues of interest to members. The Student Debates Subcommittee of the National ESA Student Affairs Committee coordinated the student efforts throughout the year and hosted the live event. This year, four unbiased introductory speakers provided background for each debate topic while four multi-university teams were each assigned a debate topic under the theme ‘Technological Advances to Address Current Issues in Entomology’. The two debate topics selected were as follows: 1) What is the best taxonomic approach to …

Does Cover Crop Management Affect Arthropods In The Subsequent Corn And Soybean Crops In The United States? A Systematic Review, Gabriela Inveninato Carmona, Leslie Delserone, Julia Nogueira Duarte Campos, Tauana Ferreira De Almeida, Dânia Vieira Branco Ozório, Juan David Betancurt Cardona, Robert J. Wright, Anthony J. Mcmechan

Department of Entomology: Faculty Publications

Cover crops (CC) support populations of pest and beneficial arthropods. The status of these arthropods in the subsequent cash crop depends on several factors such as CC species, management, biomass production, and weather conditions. A systematic review was performed to identify how CC management influences pest and beneficial arthropods and to identify knowledge gaps for the future research efforts. Eight studies included in this review indicated that CC increase beneficial arthropods or some beneficial arthropods compared with the CC managed fields. A minority of the studies indicated an increase in pest presence when using CC. Cover crop species, termination time …

Sensitray: An Integrated Measuring Device For Monitoring Children’S Mealtime Dietary Intake, Hunter S. Guru, Anthony D. Weng, Santosh Pitla, Dipti Dev

Department of Child, Youth, and Family Studies: Faculty Publications

Childhood nutrition establishes consumption norms that affect an individual’s health over the course of their lives. However, early nutrition interventions to establish such norms are uncommon owing to the various inefficiencies associated with current methods of measuring childhood nutrition. Here, we present an IoT measuring device, called the SensiTray, which accurately tracks mealtime intake in a child-friendly and cost-effective fashion. Principal technologies underlying the SensiTray (including mass-sensing technologies, microcontrollers) are identified and analyzed, along with other design choices. Operation of the SensiTray is explained with special attention given to SensiTray software peripherals and algorithms. Preliminary testing consisted of static and …

Statistics Used In The Nebraska Beef Cattle Report And Their Purpose

Nebraska Beef Cattle Reports

The purpose of beef cattle and beef product research at UNL is to provide reference information that represents the various populations (cows, calves, heifers, feeders, carcasses, retail products, etc) of beef production. Obviously, the researcher cannot apply treatments to every member of a population; therefore he/she must sample the population. The use of statistics allows the researcher and readers of the Nebraska Beef Cattle Report the opportunity to evaluate separation of random (chance) occurrences and real biological effects of a treatment. Following is a brief description of the major statistics used in the beef report. For a more detailed description …

Dietary Impact On Antibiotic Resistance In Feedlot Manure, Maranatha Zelt, Amy Schmidt, Noelle Mware, Xu Li, Galen E. Erickson

Nebraska Beef Cattle Reports

There is a growing public concern regarding antibiotic resistance and the use of antibiotics, including in livestock management. Understanding the ecology of antibiotic resistance among microbes, identifying resistance gene reservoirs, and implementing antibiotic resistance mitigation practices in livestock production are critical to protecting animal and human health while meeting increasing food demands. This research is one of several studies seeking to assess risk for livestock- to- human transfer of antibiotic resistance and to identify mechanisms for reducing that risk where possible. This study evaluated the impact of forage concentration and supplemental essential oil in beef cattle finishing diets on antibiotic …