Digital Commons Network^™

Vertebrates On The Brink As Indicators Of Biological Annihilation And The Sixth Mass Extinction, Gerardo Ceballos, Paul R. Ehrlich, Peter H. Raven

Harold W. Manter Laboratory of Parasitology: Library Materials

The ongoing sixth mass species extinction is the result of the destruction of component populations leading to eventual extirpation of entire species. Populations and species extinctions have severe implications for society through the degradation of ecosystem services. Here we assess the extinction crisis from a different perspective. We examine 29,400 species of terrestrial vertebrates, and determine which are on the brink of extinction because they have fewer than 1,000 individuals. There are 515 species on the brink (1.7% of the evaluated vertebrates). Around 94% of the populations of 77 mammal and bird species on the brink have been lost in …

Rfia: An R Package For Estimation Of Forest Attributes With The Us Forest Inventory And Analysis Database, Hunter Stanke, Andrew O. Finley, Aaron S. Weed, Brian F. Walters, Grant M. Domke

United States National Park Service: Publications

Forest Inventory and Analysis (FIA) is a US Department of Agriculture Forest Service program that aims to monitor changes in forests across the US. FIA hosts one of the largest ecological datasets in the world, though its complexity limits access for many potential users. rFIA is an R package designed to simplify the estimation of forest attributes using data collected by the FIA Program. Specifically, rFIA improves access to the spatiotemporal estimation capacity of the FIA Database via space–time indexed summaries of forest variables within user-defined population boundaries (e.g., geographic, temporal, biophysical). The package implements multiple design-based estimators, and has …

Combined Use Of Sentinel‐1 Sar And Landsat Sensors Products For Residual Soil Moisture Retrieval Over Agricultural Fields In The Upper Blue Nile Basin, Ethiopia, Getachew Ayehu, Tsegaye Tadesse, Berhan Gessesse, Yibeltal Yigrem, Assefa M. Melesse

National Drought Mitigation Center: Faculty Publications

The objective of this paper is to investigate the potential of sentinel‐1 SAR sensor products and the contribution of soil roughness parameters to estimate volumetric residual soil moisture (RSM) in the Upper Blue Nile (UBN) basin, Ethiopia. The backscatter contribution of crop residue water content was estimated using Landsat sensor product and the water cloud model (WCM). The surface roughness parameters were estimated from the Oh and Baghdadi models. A feed‐forward artificial neural network (ANN) method was tested for its potential to translate SAR backscattering and surface roughness input variables to RSM values. The model was trained for three inversion …

Textil Y Territorio: Sobre Los Tejidos Intrincados De Poroma, Norte De Chuquisaca, Bolivia, Verónica Auza Aramayo

PreColumbian Textile Conference VIII / Jornadas de Textiles PreColombinos VIII (2019)

La presente propuesta pretende comprender cómo el sistema territorial andino está manifiesto en el lenguaje visual de los tejidos; específicamente en el estudio de los tejidos de Poroma, Norte de Chuquisaca, Bolivia. Cultura andina caracterizada por una larga historia que evoca diversos movimientos y procesos multiétnicos, que estableció, en un valle de características tórridas, una auto denominación cultural que la designa como «llameros», vale decir, gente que desde las altas punas antiguamente y hasta la década de 1980 se desplazaba con sus caravanas de llamas, marcando un mercado de bienes a lo largo de la cordillera. Esta forma de nombrarse …

The Total Solar Eclipse Of 2017: Meteorological Observations From A Statewide Mesonet And Atmospheric Profiling Systems, Rezaul Mahmood, Megan Schargorodski, Eric Rappin, Melissa Griffin, Patrick Collins, Kevin Knupp, Andrew Quilligan, Ryan Wade, Kevin Cary, Stuart Foster

School of Natural Resources: Faculty Publications

A total solar eclipse traversed the continental United States on 21 August 2017. It was the first such event in 99 years and provided a rare opportunity to observe the atmospheric response from a variety of instrumented observational platforms. This paper discusses the highquality observations collected by the Kentucky Mesonet (www.kymesonet.org), a research-grade meteorological and climatological observation network consisting of 72 stations and measuring air temperature, precipitation, relative humidity, solar radiation, wind speed, and wind direction. The network samples the atmosphere, for most variables, every 3 s and then calculates and records observations every 5 min. During the total solar …

Hawaii As A Microcosm: Advancing The Science And Practice Of Managing Introduced And Invasive Species, Liba Pejchar, Christopher A. Lepczyk, Jean E. Fantle-Lepczyk, Steven C. Hess, M. Tracy Johnson, Christina R. Leopold, Michael Marchetti, Katherine M. Mcclure, Aaron B. Shiels

United States Department of Agriculture Wildlife Services: Staff Publications

Invasive species are a leading driver of global change, with consequences for biodiversity and society. Because of extraordinary rates of endemism, introduction, and extinction, Hawaii offers a rich platform for exploring the cross-disciplinary challenges of managing invasive species in a dynamic world. We highlight key successes and shortcomings to share lessons learned and inspire innovation and action in and beyond the archipelago. We then discuss thematic challenges and opportunities of broad relevance to invaded ecosystems and human communities. Important research needs and possible actions include eradicating mammals from mainland island sanctuaries, assessing hidden threats from poorly known introduced species, harnessing …

Development Of A Modified Floristic Quality Index As A Rapid Habitat Assessment Method In The Northern Everglades, Rebakah E. Gibble, Donatto D. Surratt

United States National Park Service: Publications

Floristic quality assessments (FQA) using floristic quality indices (FQIs) are useful tools for assessing and comparing vegetation communities and related habitat condition. However, intensive vegetation surveys requiring significant time and technical expertise are necessary, which limits the use of FQIs in environmental monitoring programs. This study modified standard FQI methods to develop a rapid assessment method for characterizing and modeling change in wetland habitat condition in the northern Everglades. Method modifications include limiting vegetation surveys to a subset of taxa selected as indicators of impact and eliminating richness and/or abundance factors from the equation. These modifications reduce the amount of …

Public Perspectives And Media Reporting Of Wolf Reintroduction In Colorado, Rebecca Niemiec, Richard E.W. Berl, Mireille Gonzalez, Tara Teel, Cassiopeia Camara, Matthew Collins, Jonathan Salerno, Kevin Crooks, Courtney Schultz, Stewart Breck, Dana Hoag

United States Department of Agriculture Wildlife Services: Staff Publications

In the state of Colorado, a citizen ballot initiative to reintroduce gray wolves (Canis lupus) is eliciting polarization and conflict among multiple stakeholder and interest groups. Given this complex social landscape, we examined the social context surrounding wolf reintroduction in Colorado as of 2019. We used an online survey of 734 Coloradans representative in terms of age and gender, and we sampled from different regions across the state, to examine public beliefs and attitudes related to wolf reintroduction and various wolf management options. We also conducted a content analysis of media coverage on potential wolf reintroduction in 10 major daily …

Fire Monitoring Handbook

United States National Park Service: Publications

Fire is a powerful and enduring force that has had, and will continue to have, a profound influence on National Park Service (NPS) lands. Fire management decisions within the National Park Service require information on fire behavior and on the effects of fire on park resources. With good reason, the public is holding park management increasingly accountable, especially in the area of fire management. Federal and state agencies are instituting progressively more stringent guidelines for burning, monitoring, and evaluation. The impetus behind these guidelines and the purpose of this handbook are to ensure that management objectives are being met, to …

A Social–Ecological Odyssey In Fisheries And Wildlife Management, Andrew K. Carlson, William W. Taylor, Melissa R. Cronin, Mitchell J. Eaton, Mark A. Kaemingk, Andrea J. Reid, Ashley Trudeau

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Aldo Leopold, famous ecologist and “father” of North American wildlife management, once said, “These are two things that interest me: the relation of people to each other, and the relation of people to land” (Leopold 1947). Ever prescient, Leopold recognized that natural resource management is fundamentally about humans and their relationship with nature well before conservation became an established way of thinking, much less the bedrock of entire professions. Similarly, amid the Green Revolution to increase agricultural production, in part, through widespread use of pesticides, renowned environmentalist and journalist Rachel Carson noted that we are all “a part of nature, …

Gendering Art History In The Victorian Age: Anna Jameson, Elizabeth Eastlake, And George Eliot In Florence, Antje Anderson

School of Art, Art History, and Design: Theses and Student Creative Work

This thesis investigates how three professional Victorian women writers, Anna Jameson, Elizabeth Eastlake, and George Eliot, wrote about Renaissance art in Florence. As nineteenth-century women, they were excluded from certain realms of knowledge, agency, and influence. This exclusion (complicated by their privilege in terms of class, nationality, and education) influenced the way they experienced and wrote about art. The introduction addresses how changing modes of travel, broader access to publication, and art history’s gradual emergence as an academic discipline helped shape their careers as women art writers—the well-known “Mrs. Jameson” as a popularizer of art history for a broad readership; …

Representational Forms: Storytelling Of Climate Change, Hayden Cudaback

Masters in Architecture Program: Theses

Climate change is recognized as one of the biggest threats to our natural world and its biodiversity, as well as to global security, human health and well-being. We are already witnessing the early effects of climate change, with more frequent, extreme weather events and changing seasonal patterns being seen around the world.

Climate change is a complex object that you can’t physically connect with. Its effects can be felt, but climate change itself is an entity that people can’t understand the depth and magnitude. This characteristic of climate change makes any depiction related to its effects static and two dimensional. …

Buffalograss Diversity Assessment, Jesse Collin Marshall

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Buffalograss [Buchloë dactylodes (Nutt.) Engelm. syn. Bouteloua dactyloides (Nutt.) Columbus] is a low input alternative turfgrass for the Great Plains region. Buffalograss is a dioecious stoloniferous warm season grass with wide variation of valuable traits and is well adapted for use in minimal maintenance landscapes. The obligate outcrossing nature of the species and wide variation of potentially valuable traits make buffalograss a prime candidate for cultivar improvement and genetic study. Limited information is available regarding buffalograss genetics. In effort to expand genetic resources around buffalograss, we developed buffalograss derived simple sequence repeat markers from previously available transcriptomes of buffalograss …

Recreational Activity Dynamics At Valentine National Wildlife Refuge, Olivia A. Darugna

School of Natural Resources: Dissertations, Theses, and Student Research

Many parks and protected areas are managed for a dual purpose to conserve ecological systems and to provide wildlife-compatible recreational opportunities for visitors. Managing parks and protected areas to meet this dual goal entails progressive management approaches that incorporate information about social and ecological components of these systems. Current management regimes focus heavily on the ecological component with little or no information concerning the social component of parks and protected areas. Incorporating social information is essential for understanding and accounting for social conflicts and ecological impacts that result from a diversity of recreational activities. We examined recreational activities at Valentine …

Impact Of Cow Size And Validation Of An Electronic Feeder To Optimize Resources In Beef Production Systems, Robert L. Ziegler

Department of Animal Science: Dissertations, Theses, and Student Research

Optimizing beef production systems is critical in the longevity of an enterprise. In a time of rapid change and innovation, there are increasingly more opportunities to improve efficiency of livestock production by taking advantage of new technologies. Furthermore, production environments vary drastically in all segments of the beef industry, which influence feed resource availability. Therefore, it is critical to realize the cow type that excels in a given production environment according to management objectives. To gain a better understanding of the optimal cow type in the Nebraska Sandhills, a retrospective analysis was conducted to evaluate increasing cow body weight (BW) …

What Influences Itinerant Teacher Job Satisfaction And Intent To Stay?, Laura Barrett

Department of Educational Administration: Dissertations, Theses, and Student Research

Schools across the country are facing a shortage of qualified teachers. When they post jobs, certified applicants may be rare. The problem of teacher shortage is multifaceted, but is generally focused in two areas: recruitment and retention of teachers. Attrition is the highest among new teachers, those who have been in the profession for less than five years. By focusing on retention of teachers, schools will need to spend less time on recruiting and can devote that time to deep implementation of high-quality education.

While there have been multiple studies looking at retention of staff, there have been few studies …

Increased Drought Severity Tracks Warming In The United States’ Largest River Basin, Justin T. Martin, Gregory T. Pederson, Connie A. Woodhouse, Edward R. Cook, Gregory J. Mccabe, Kevin J. Anchukaitis, Erika K. Wise, Patrick J. Erger, Larry Dolan, Marketa Mcguire, Subhrendu Gangopadhyay, Katherine J. Chase, Jeremy S. Litell, Stephen T. Gray, Scott St. George, Jonathan M. Friedman, David J. Sauchyn, Jeannine-Marie St-Jacques, John King

United States Geological Survey: Staff Publications

Across the Upper Missouri River Basin, the recent drought of 2000 to 2010, known as the “turn-of-the-century drought,” was likely more severe than any in the instrumental record including the Dust Bowl drought. However, until now, adequate proxy records needed to better understand this event with regard to long-term variability have been lacking. Here we examine 1,200 y of streamflow from a network of 17 new tree-ring–based reconstructions for gages across the upper Missouri basin and an independent reconstruction of warm-season regional temperature in order to place the recent drought in a long-term climate context. We find that temperature has …

Geographic Variation In Host Selection In The Spider Wasps Entypus Unifasciatus (Say) And Tachypompilus Ferrugineus (Say) (Hymenoptera: Pompilidae), Frank E. Kurczewski, Joseph W. Stoll, Rick C. West, Kelly C. Kissane, Neil Stanley Cobb

Insecta Mundi

Geography and host spider family are strongly linked in the spider wasps (Hymenoptera: Pompilidae) Entypus unifasciatus (Say) and Tachypompilus ferrugineus (Say) (rusty spider wasp) when 2031 host spider local­ity records from the years 1918–2020 are mapped. Entypus unifasciatus lycosid host records are plentiful from 43–44° N in the U.S. to northern Mexico. Tachypompilus ferrugineus lycosid host records are numerous from southern Ontario and New England to Mexico east of the Rocky Mountains. Most E. unifasciatus and T. ferrugin­eus pisaurid host records are from the SE U.S. Trechaleid host records for E. unifasciatus and T. ferrugineus are predominant in southern Mexico …

Going The Distance: A Case Study Of One Community College's Journey Across The Digital Divide, Michael Robert Jolley

Department of Educational Administration: Dissertations, Theses, and Student Research

Rural communities throughout the nation continue to lag their urban and suburban peers in access to high-speed internet service. This digital divide affects rural populations in a myriad of ways, but access to higher educational opportunities may be most problematic. While the promise of technology to level the field for rural students continues to offer hope, the scarcity of broadband service lingers. This qualitative instrumental case study explores how one exceptional rural community college in the Great Plains developed the capacity to deliver distance education programming. The study relies upon Rogers's theory of diffusion of innovations to validate the extent …

Inscribing The South For Harper's Weekly In 1866, Ashlyn Stewart

Department of English: Dissertations, Theses, and Student Research

The top weekly publication in the nineteenth-century United States, Harper’s Weekly, faced a new challenge after it had survived the Civil War: what would keep readers subscribing to the periodical in peacetime? To maintain their remarkably large readership, the editors looked southward and produced abundant content about the Reconstruction South for its primarily Northeastern readership. A noteworthy portion of that content was a series of powerful illustrated articles known as “Pictures of the South,” which ran from April to October 1866. Seasoned war correspondents Alfred R. Waud and Theodore R. Davis travelled through the rapidly rebuilding South on behalf of …

Some Economic Implications Of The Covid-19 Pandemic In Nebraska, John C. Beghin

Cornhusker Economics

It is now clear that the spread, mortality and morbidity impacts of the coronavirus pandemic are sizeable but extremely heterogeneous across multiple dimensions. Geography shows that places with lower human con-centrations (urban/rural divide) and away from main travel axes, such as major interstate highways and in-ternational airports, have a lower incidence of cases. Large urban centers with high human concentrations have been much disproportionally affected and with much higher mortality rates. Age and health status are equally important. Mortality increases dramatically for people 60 years old and older. People with comorbidi-ties (cardiovascular, obesity, diabetes, and others) are much more likely …

La Dimension Cinématographique Du Paysage Dans L’Œuvre Littéraire De Julien Gracq, El Arbi El Bakkali

20th and 21st Century French and Francophone Studies International Colloquium

Classé parmi les maîtres de la littérature contemporaine en France, Julien Gracq de son vrai nom Louis Poirier (professeur de géographie) a pu marquer sa carrière d’écrivain sans qu’il s’inscrive à aucun courant littéraire précis. Sa production littéraire est protéiforme et s’étale sur deux grandes périodes littéraires: la première (1938-1967) prenait du surréalisme et de la fiction comme cadre principal de création littéraire tandis que la seconde période (1967-1992) était axée sur des fragments d’autobiographie, réflexions sur la littérature et médiations géographiques. Il est important de souligner que le point commun entre ces deux périodes artistiques de l’auteur est l’omniprésence …

Water Scarcity And Fish Imperilment Driven By Beef Production, Brian D. Richter, Dominique Bartak, Peter Caldwell, Kyle Fankel Davis, Peter Debaere, Arjen Y. Hoekstra, Tianshu Li, Landon Marston, Ryan Mcmanamay, Mesfin Mekonnen, Benjamin L. Ruddell, Richard R. Rushforth, Tara J. Troy

Daugherty Water for Food Global Institute: Faculty Publications

Human consumption of freshwater is now approaching or surpassing the rate at which water sources are being naturally replenished in many regions, creating water shortage risks for people and ecosystems. Here we assess the impact of human water uses and their connection to water scarcity and ecological damage across the United States, identify primary causes of river dewatering and explore ways to ameliorate them. We find irrigation of cattle-feed crops to be the greatest consumer of river water in the western United States, implicating beef and dairy consumption as the leading driver of water shortages and fish imperilment in the …

"History Of Nebraska Club", Allison Metschke, Hailey Just

Honors Program: Expanded Learning Clubs

This club is designed to educate young kids on the history of Nebraska. Topics cover a wide variety of ideas, including: the Oregon Trail, Native Americans, teepees, tribes, clothing, buffalo, Chimney Rock, Homestead National Monument, how Nebraska became a state, and general information about Nebraska.

Federal Land-Use Policy And Resettlement In The Great Plains: An Experiment In Community Development During The New Deal Years, 1933–1941, Theresa Glanz

Department of Geography: Dissertations, Theses, and Student Research

In 1933, the United States federal government authorized the National Industrial Recovery Act to help the country recover from the Great Depression. Section 208, Title II of the National Industrial Recovery Act authorized the creation of subsistence homesteads to aid in the recovery of destitute rural families and the urban unemployed. Between 1933 and 1941, the United States federal government authorized the construction of 207 rural and urban resettlement communities to house impoverished farm families and unemployed urban workers. The projects were located throughout the United States, including in the territories of Hawaii, Alaska, Puerto Rico, and the U.S. Virgin …

(Cultural) Taxation Without Representation? How Educational Developer Can Broker Discourse On Black Faculty Lives In The #Blacklivesmatter Era, Richard J. Reddick, Beth E. Bukoski, Stella L. Smith

To Improve the Academy: A Journal of Educational Development

Predominantly White institutions (PWIs) in creative class cities offer contradictory experiences for Black faculty, who engage in invisible additional labor in response to racial aggressions, termed cultural taxation (CT). With an understanding that equity-minded faculty development is an essential space in which to respond to this reality, our study employed a phenomenological focus group design to investigate how Black faculty at a research-intensive PWI located in a creative class city buffeted by racial tensions navigated their service and community experiences. While finding their work meaningful, the participants shared experiences of the multifaceted nature of CT, their stress from teaching about …

A Global Perspective On Sustainable Intensification Research, Kenneth Cassman, Patricio Grassini

Department of Agronomy and Horticulture: Faculty Publications

Despite general agreement that meeting food demand without further loss of natural ecosystems requires sustainable intensification, there is little dialogue about the research agenda needed to achieve it. To that end, we evaluate current trajectories towards sustainable intensification, review published research on the topic, identify missing links, and propose a prioritization framework to fill gaps. Although progress towards sustainable intensification is behind schedule, we are optimistic that current trends can get back on course assuming a well-prioritized and adequately funded research portfolio and appropriate policies and institutions to support it.

Relationship Quality In Kin And Chosen Kin Familial Networks, Eliza Thor

Department of Sociology: Dissertations, Theses, and Student Research

Family relationships are sources of both stress and support for most individuals. They are also among the most resilient, offering support through long periods of conflict. Growing scholarly research on LGB families demonstrates that LGB individuals face greater levels of conflict, which stems from a lack of acceptance of their identities. As of yet, little work has directly compared LGB familial relationships to heterosexual family relationships. This study seeks to fill this gap by comparing the relationship characteristics of LGB and heterosexual individuals using network data drawn from the Nebraska Annual Social Indicators Survey (2018 and 2019). I employed multilevel …

Ethnic–Racial Socialization Mapping In Ethnic–Racial Minority Populations: Exploring The Efficacy Of An Intervention To Increase Well-Being And Secure Ethnic–Racial Identity, Mackensie Minniear

Department of Communication Studies: Dissertations, Theses, and Student Research

In this dissertation, I explore the benefits of developing an intervention entitled ethnic-racial socialization mapping. Previously, researchers have developed the importance of establishing a secure ethnic-racial identity in ethnic-racial minority populations, as it is tied with increased well-being. Additionally, researchers have called for interventions that highlight the role of ethnic-racial socialization in minority populations, as this process is connected with a secure ethnic-racial identity. I answer these calls by reviewing current research, leading to the creation of ethnic-racial socialization mapping as an identity intervention. In chapter 1, I explore how ethnic-racial identity and ethnic-racial socialization has been conceptualized, as well …

An Analysis Of Social Dominance In The Feeding Of Ex Situ Humboldt Penguins (Spheniscus Humboldti), Robert Gabel

Honors Program: Senior Projects (Public)

In the field of ecology, complex social structures, including dominance hierarchies, have been demonstrated in a variety of fauna, including bird species. While wild Humboldt Penguins (Spheniscus humboldti) do not exhibit a feeding hierarchy, captive penguins are under very different conditions. Humboldt penguins feed on schooling fish in the wild, but in captivity are hand fed from a zookeeper. I investigated whether there is a nonrandom pattern of dominance in the feeding order of the penguins at the Lincoln Children’s Zoo, in Lincoln, NE, USA. Using a camera and tripod, with assistance from four of the zookeepers, I …