Digital Commons Network^™

Use Of Agro-Climatic Zones To Upscale Simulated Crop Yield Potential, Justin Van Wart, Lenny G.J. Van Bussel, Joost Wolf, Rachel Licker, Patricio Grassini, Andrew Nelson, Hendrik Boogaard, James Gerber, Nathaniel D. Mueller, Lieven Claessens, Martin K. Van Ittersum, Kenneth Cassman

Department of Agronomy and Horticulture: Faculty Publications

Yield gap analysis, which evaluates magnitude and variability of difference between crop yield potential (Yp) or water limited yield potential (Yw) and actual farm yields, provides a measure of untapped food production capacity. Reliable location-specific estimates of yield gaps, either derived from research plots or simulation models, are available only for a limited number of locations and crops due to cost and time required for field studies or for obtaining data on long-term weather, crop rotations and management practices, and soil properties. Given these constraints, we compare global agro-climatic zonation schemes for suitability to up-scale location-specific estimates of Yp and …

From Mounds To Maps To Models: Visualizing Ancient Architecture Across Landscapes, Heather Richards-Rissetto

Department of Anthropology: Faculty Publications

Since the onset of settlement pattern studies in the 1950s, landscape mapping projects have become an archaeological mainstay. Remote sensing technologies such as lidar, photogrammetry, and SAR (Synthetic Aperture Radar) steadily reveal new archaeological sites. For landscape archaeology, the detection and mapping of small architectural complexes and households offers important data to contextualize larger (often already known) sites and perform regional analyses. However, because the majority of sites remain unexcavated, analysis is limited, and yet Geographic Information Systems (GIS) and 3D Visualization are expanding the possible uses for older and newly-acquired data on unexcavated mounds. This paper describes a GIS …

References From Landslide Ecology, Lawrence R. Walker, Aaron B. Shiels

United States Department of Agriculture Wildlife Services: Staff Publications

No abstract provided.

Competencies And Experiences Needed By Pre–Service Agricultural Educators To Teach Globalized Curricula: A Modified Delphi Study, Nathan W. Conner, T. Grady Roberts

Department of Agricultural Leadership, Education, and Communication: Faculty Publications

The 21st century graduate must be able to interact with people from all over the world and must also be knowledgeable about the world (Longview Foundation, 2008). In order to produce graduates that are globally competent, The National Council for the Accreditation of Teachers (NCATE, 1982) has mandated that multi–cultural education be incorporated as part of the teacher–preparation curricula. The purpose of this study was to identify competencies and experiences needed by agricultural pre–service teachers in order to teach globalized curricula. A modified Delphi method was used and the panel consisted of 13 (n = 13) experts in the field …

Chemistry And Microbial Functional Diversity Differences In Biofuel Crop And Grassland Soils In Multiple Geographies, Lidia S. Watrud, Jay R. Reichman, Michael A. Bollman, Bonnie M. Smith, E. Henry Lee, Julie D. Jastrow, Michael D. Casler, Harold P. Collins, Steven Fransen, Robert B. Mitchell, Vance N. Owens, Brent Bean, William L. Rooney, Donald D. Tyler, George A. King

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

We obtained soil samples from geographically diverse switchgrass (Panicum virgatum L.) and sorghum (Sorghum bicolor L.) crop sites and from nearby reference grasslands and compared their edaphic properties, microbial gene diversity and abundance, and active microbial biomass content. We hypothesized that soils under switchgrass, a perennial, would be more similar to reference grassland soils than sorghum, an annual crop. Sorghum crop soils had significantly higher NO₃ ⁻-N, NH₄ ⁺-N, SO₄ ²⁻-S, and Cu levels than grassland soils. In contrast, few significant differences in soil chemistry were observed between switchgrass crop and grassland …

Chapter 14: Intergenerational Relationships And Rural Return Migration, Christiane Von Reichert, John B. Cromartie, Ryan O. Arthun

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

In the rural United States (US), where roughly one in five Americans live, elderly are overrepresented, with 14.6% of the population versus 12% for the nation (US Census Bureau 2009a). Additionally, the proportion of elderly is growing faster in rural than in urban places due to persistent outmigration of rural youth (Cromartie 2007; Brown and Glasgow 2008). The shrinking proportion of younger cohorts represents a serious challenge for many rural communities. Especially in geographically isolated areas where elderly make up 18% of the population, prolonged and persistent out-migration of youth goes hand in hand with natural population loss (McGranahan and …

Hydrology And Water Quality Of A Field And Riparian Buffer Adjacent To A Mangrove Wetland In Jobos Bay Watershed, Puerto Rico, C. O. Williams, R. Lowrance, D. D. Bosch, J. R. Williams, E. Benham, A. Dieppa, R. Hubbard, E. Mas, T. Potter, D. Sotomayor, E. M. Steglich, T. Strickland, R. G. Williams

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Agriculture in coastal areas of Puerto Rico is often adjacent to or near mangrove wetlands. Riparian buffers, while they may also be wetlands, can be used to protect mangrove wetlands from agricultural inputs of sediment, nutrients, and pesticides. We used simulation models and field data to estimate the water, nitrogen, and phosphorus inputs from an agricultural field and riparian buffer to a mangrove wetland in Jobos Bay watershed, Puerto Rico. We used the Agricultural Policy/Environmental eXtender (APEX) and the Riparian Ecosystem Management Model (REMM) models sequentially to simulate the hydrology and water quality of the agricultural fields and an adjacent …

Use Of Dairies By Postreproductive Flocks Of European Starlings, H. J. Homan, Jeffrey T. Lejeune, David L. Pearl, T. W, Seamans, A. A. Slowik, Mark R. Morasch, G. M. Linz

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Knowledge of the behavior and movement patterns of European starlings (Sturnus vulgaris L.) is important to wildlife managers that seek to resolve conflicts at livestock facilities. We captured and radio tagged 10 starlings at each of 5 dairies in northeastern Ohio. From September 19 to October 31, 2007, we obtained sufficient data from 40 birds to study their behavior and movements. The birds visited the dairies where they were initially captured (home sites) on 85% of the days, spending 58% of each day at the dairies. Onsite arrival and departure times were 2.5 h after sunrise and 3.1 h …

Regional Scale Patterns Of Fine Root Lifespan And Turnover Under Current And Future Climate, M. Luke Mccormack, David M. Eissenstat, Anantha M. Prasad, Erica A. H. Smithwick

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Fine root dynamics control a dominant flux of carbon from plants and into soils and mediate potential uptake and cycling of nutrients and water in terrestrial ecosystems. Understanding of these patterns is needed to accurately describe critical processes like productivity and carbon storage from ecosystem to global scales. However, limited observations of root dynamics make it difficult to define and predict patterns of root dynamics across broad spatial scales. Here, we combine species-specific estimates of fine root dynamics with a model that predicts current distribution and future suitable habitat of temperate tree species across the eastern United States (US). Estimates …

Assessing Connections Between Young Children’S Affinity For Nature And Their Experiences In Natural Outdoor Settings In Preschools, Camilla S. Rice, Julia C. Torquati

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

The purposes of this research were to: develop a reliable measure of children’s affinity for nature or “biophilia”; determine whether young children’s biophilia was related to the “green-ness” of the outdoor play area of the preschool they attend; examine whether demographic variables are associated with children’s biophilia; and determine whether demographic variables predict children’s enrollment in nature-oriented programs. We recruited children from ten early childhood education programs—six that had outdoor play spaces with many natural elements and four that had few or none of these elements. One hundred fourteen preschool-aged children completed an 11-item measure of biophilia that included preferences …

Beyond The Walls: Conceptualizing Natural Environments As “Third Educators”, Julia C. Torquati, Julie A. Ernst

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

This research examined preservice early childhood educators’ perceptions of outdoor settings and their intentions to use outdoor settings in their teaching practice. Students enrolled in an early childhood education program (n = 110) at a university in the Great Lakes region completed surveys that assessed perceptions of natural settings, intentions to use natural settings in future teaching, knowledge of the benefits of nature for children, and personal nature relatedness. Participants reported relatively high intentions to use natural settings in future teaching, as well as knowledge of the benefits of nature for children, but moderate levels of personal nature relatedness. Participants …

Overview Of The Large-Scale Biosphere–Atmosphere Experiment In Amazonia Data Model Intercomparison Project (Lba-Dmip), Luis Gustavo Goncalves De Goncalves, Jordan Borak, Marcos Heil Costa, Scott R. Saleska, Ian Baker, Natalia Resprepo-Coupe, Michel Nobre Muza, Benjamin Poulter, Hans Verbeeck, Joshua B. Fisher, Altaf Arain, Phillip Arkin, Bruno P. Cestaro, Bradley Christoffersen, David Galbraith, Xiaodan Guan, Bart Van Den Hurk, Kazuhito Ichii, Hewlley Acioli Imbuzeiro, Atul Jain, Naomi Levine, Chaoqun Lu, Gonzalo Migues-Macho, Debora Roberti, Alok Sahoo, Koichi Sakaguchi, Kevin Shaefer, Mingjie Shi, James Shuttleworth, Hanqin Tian, Zong-Lian Yang, Xubin Zeng

United States National Aeronautics and Space Administration: Publications

A fundamental question connecting terrestrial ecology and global climate change is the sensitivity of key terrestrial biomes to climatic variability and change. The Amazon region is such a key biome: it contains unparalleled biological diversity, a globally significant store of organic carbon, and it is a potent engine driving global cycles of water and energy. The importance of understanding how land surface dynamics of the Amazon region respond to climatic variability and change is widely appreciated, but despite significant recent advances, large gaps in our understanding remain. Understanding of energy and carbon exchange between terrestrial ecosystems and the atmosphere can …

Inheritance Of Cry1f Resistance, Crossresistance And Frequency Of Resistant Alleles In Spodoptera Frugiperda (Lepidoptera: Noctuidae), A. M. Vélez, T. A. Spencer, A. P. Alves, D. Moellenbeck, R. L. Meagher, H. Chirakkal, B. D. Siegfried

Department of Entomology: Faculty Publications

Transgenic maize, Zea maize L., expressing the Cry1F protein from Bacillus thuringiensis has been registered for Spodoptera frugiperda ( J. E. Smith) control since 2003. Unexpected damage to Cry1F maize was reported in 2006 in Puerto Rico and Cry1F resistance in S. frugiperda was documented. The inheritance of Cry1F resistance was characterized in a S. frugiperda resistant strain originating from Puerto Rico, which displayed >289-fold resistance to purified Cry1F. Concentration–response bioassays of reciprocal crosses of resistant and susceptible parental populations indicated that resistance is recessive and autosomal. Bioassays of the backcross of the F1 generation crossed with the resistant parental …

Genetic Diversity And Relatedness Of The Mangrove Rhizophora Mangle L. (Rhizophoraceae) Using Amplified Fragment Polymorphism (Aflp) Among Locations In Florida, Usa And The Caribbean, M. Albrecht, K. M. Kneeland, E. Lindroth, John E. Foster

Department of Entomology: Faculty Publications

Rhizophora mangle L. is a widespread mangrove species in theWestern Hemisphere. Mangrove habitat loss and their importance to coastal and reef ecosystems make greater understanding of their genetic structure useful for conservation and management. An amplified fragment polymorphism (AFLP) analysis was performed on samples from Florida and the Caribbean to discover the genetic structure present. R. mangle had variable genetic diversity not related to latitude; P ranged 7 %–92 %. Some other factor, perhaps human impact, has caused low genetic diversity in some populations. Across Florida R. mangle populations varied in genetic diversity with less diversity (G_st=0.195) and …

Multidisciplinary Approach To Epizootiology And Pathogenesis Of Bat Rabies Viruses In The United States, J. A. Ellison, S. R. Johnson, N. Kuzmina, A. T. Gilbert, W. C. Carson, Kurt C. Vercauteren, C. E. Rupprecht

United States Department of Agriculture Wildlife Services: Staff Publications

Zoonotic disease surveillance is typically initiated after an animal pathogen has caused disease in humans. Early detection of potentially high-risk pathogens within animal hosts may facilitate medical interventions to cope with an emerging disease. To effectively spillover to a novel host, a pathogen may undergo genetic changes resulting in varying transmission potential in the new host and potentially to humans. Rabies virus (RABV) is one model pathogen to consider for studying the dynamics of emerging infectious diseases under both laboratory and field conditions. The evolutionary history of RABV is characterized by regularly documented spillover infections and a series of notable …

Biodiversity, Biogeography, And Conservation Of Bats In The Lesser Antilles, Scott C. Pedersen, Hugh H. Genoways, Gary G. Kwiecinski, Peter A. Larsen, Roxanne J. Larsen

University of Nebraska State Museum: Mammalogy Papers

The chiropteran fauna of the Lesser Antilles consists of 27 species. The diversity of this fauna is low when compared with Neotropical faunas of large continental islands or at sites on the adjacent mainland, however, the Lesser Antillean fauna contains 11 species endemic to these islands making it worthy of large-scale conservation efforts. At the southern end of the Lesser Antilles, the biological limit of the Lesser Antillean bat fauna is marked by Koopman’s Line. To the south of this line, the bat faunas of the Grenadines and Grenada are composed of South American and widespread species of bats. The …

Stand- And Landscape-Scale Selection Of Large Trees By Fishers In The Rocky Mountains Of Montana And Idaho, Michael K. Schwartz, Nicholas J. Decesare, Benjamin S. Jimenez, Jeffrey P. Copeland, Wayne E. Melquist

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

The fisher (Pekania pennanti; formerly known as Martes pennanti) is a North American endemic mustelid with a geographic distribution that spans much of the boreal forests of North America. In the Northern Rocky Mountain (NRM) fishers have been the focus of Endangered Species Act (ESA) listing decisions. Habitat studies of West Coast fishers in California have consistently identified late-successional forests as important, providing direct implications for forest management and fisher conservation. In the NRM range very little is known about the habitat selection patterns of fishers relative to forest age and species composition, yet ESA petitioners have repeatedly listed habitat …

Predictive Models For Escherichia Coli Concentrations At Inland Lake Beaches And Relationship Of Model Variables To Pathogen Detection, Donna S. Francy, Erin A. Stelzer, Joseph W. Duris, Amie M. G. Brady, John H. Harrison, Heather E. Johnson, Michael W. Ware

United States Geological Survey: Staff Publications

Predictive models, based on environmental and water quality variables, have been used to improve the timeliness and accuracy of recreational water quality assessments, but their effectiveness has not been studied in inland waters. Sampling at eight inland recreational lakes in Ohio was done in order to investigate using predictive models for Escherichia coli and to understand the links between E. coli concentrations, predictive variables, and pathogens. Based upon results from 21 beach sites, models were developed for 13 sites, and the most predictive variables were rainfall, wind direction and speed, turbidity, and water temperature. Models were not developed at sites …

Phenology-Assisted Classification Of C3 And C4 Grasses In The U.S. Great Plains And Their Climate Dependency With Modis Time Series, Cuizhen Wang, E. Raymond Hunt Jr., Li Zhang, Huadong Guo

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Grassland ecosystems in the North America are primarily composed of C3 and C4 plant functional types (PFTs) that have different responses to the changing climate. Knowledge of their spatial distributions and temporal var- iations helps us better understand the ecological functions and climate dependencies of grasslands. This study used the 500-m MODIS surface reflectance products (MOD09A1) from 2000 to 2009 to extract NDVI time series of C3 and C4 grass PFTs in different floristic regions (tallgrass, shortgrass, and mixed-grass prairies.) A set of phe- nology metrics, including Start of Season, End of Season, Season Length, Peak NDVI, Peak Date, and …

Competencies And Experiences Needed By Pre–Service Agricultural Educators To Teach Globalized Curricula: A Modified Delphi Study, Nathan Conner, T. Grady Roberts

Department of Agricultural Leadership, Education, and Communication: Faculty Publications

The 21st century graduate must be able to interact with people from all over the world and must also be knowledgeable about the world (Longview Foundation, 2008). In order to produce graduates that are globally competent, The National Council for the Accreditation of Teachers (NCATE, 1982) has mandated that multi–cultural education be incorporated as part of the teacher–preparation curricula. The purpose of this study was to identify competencies and experiences needed by agricultural pre–service teachers in order to teach globalized curricula. A modified Delphi method was used and the panel consisted of 13 (n = 13) experts in the field …

Geog 140: Human Geography—A Peer Review Of Teaching Project Benchmark Portfolio, Katherine Nashleanas

UNL Faculty Course Portfolios

This benchmark portfolio will systematically evaluate my course in relation to ACE and Advanced Placement Human Geography standards and objectives. It will enable me to evaluate ways of increasing student engagement in large lecture classes, student retention, and organization that supports student mental health. As a result of writing this portfolio, I will be able to evaluate the internal consistency and coherence of my course. This portfolio provides a conceptual structure and physical place to put observations and notes about course improvement from semester to semester, which will enable me to become even more secure about the intellectual and pedagogical …

Understanding American Mexican Children, Víctor Zúñiga, Edmund T. Hamann

Department of Teaching, Learning, and Teacher Education: Faculty Publications

In 1997, when we first met while independently conducting field work in Whitfield County, Georgia, and its county seat, Dalton, we heard from local principals and teachers that Latino students sometimes "disappeared" from the schools. Most of these who disappeared were immigrant students from Mexico and other Central American countries, students who had arrived suddenly in local schools while accompanying their parents who found jobs in the carpet and poultry mills of the area (Hamann, 2003; Hernández-León & Zúñiga, 2000; Zúñiga & Hernández-León, 2009). The "disappearances" led one of us (Hamann, 2001) to develop a concept—the sojourner student—and draw from …

Did Irrigation Impact 20th Century Temperature In The High Plains Aquifer Region?, Rezaul Mahmood

School of Natural Resources: Faculty Publications

No abstract provided.

Wildlife In Airport Environments: Chapter 13 Radar Technology To Monitor Hazardous Birds At Airports, Sidney A. Gauthreaux Jr., Paige M. Schmidt

United States Department of Agriculture Wildlife Services: Staff Publications

Bird strikes are the most common wildlife hazard to aviation safety (Dolbeer et ale 2000). Advances in habitat management at airports through the elimination and reduction of attractants, in combination with hazing and lethal control, have reduced avian hazards < 152 m (500 feet) above ground level. Bird strikes above this altitude, however, are beyond the limits of traditional wildlife control techniques (Dolbeer 2011). Traditional avian survey methods used to monitor birds at airports (Cleary and Dolbeer 2005; Chapter 14) often fail to provide essential information on local bird activity and migration at higher altitudes, hazardous bird use of attractants near airports, and bird activity at night-information that could be provided by the strategic use of radar technology at and near airports (Dolbeer 2006).

Using Undergraduates To Prepare International Teaching Assistants For The American Classroom: Development Of Senior Faculty, Warren E. Christian, Brian J. Rybarczyk

To Improve the Academy: A Journal of Educational Development

This chapter describes how undergraduates may be used in the training of international teaching assistants (IT As) in three ways: as conversation partners, classroom consultants, and guest instructors. Increasing the contact between undergraduates and international graduate students before they meet in the classroom as students and instructors can benefit each group. After a brief review of the literature that explores the chal lenges IT As face in the American university classroom, we describe the roles that undergraduates may perform in training IT As, explain the benefits to both IT As and undergraduates, and provide a list of best practices for …

The Reacting To The Past Pedagogy And Engaging The First–Year Student, Paula Kay Lazrus, Gretchen Kreahling Mckay

To Improve the Academy: A Journal of Educational Development

This chapter investigates the value of the Reacting to the Past pedagogy with regard to engaging first-year students. In recent years, calls to improve student engagement and active learning techniques have grown, and few have been as successful in producing the desired results as Reacting to the Past. This chapter investigates why Reacting is so suc cessful in meeting the goals of high-impact practices that increase student engagement and learning. We also examine how the Reacting pedagogy and first-year seminars encourage problem solving, critical thinking, and writing among students.

The Tools And Technologies Of Transdisciplinary Climate Change Research And Community Empowerment In Barbuda, Sophia Perdikaris, Katherine Hejtmanek, Rebecca Boger, Jennifer Adams, Amy E. Potter, John Mussington

School of Global Integrative Studies: Faculty Publications

Focusing on the smaller sister-island of Barbuda, part of the Caribbean nation of Antigua and Barbuda, a group of collaborating anthropologists, archaeologists, biologists, education specialists, geographers, and environmental scientists are studying long-term human ecodynamics, the relationship amongst people, place, and the environment from the beginning of the peopling of a place through modern day. Our transdisciplinary approach brings together various field methods, tools and technologies from each field and crosses the boundaries of conventional science. This approach furthers our knowledge of climate change and facilitates practical and sustainable solutions for vulnerable populations.

The Caves Of Barbuda’S Eastern Coast: Long Term Occupation, Ethnohistory And Ritual, Sophia Perdikaris, Sandrine Grouard, George Hambrecht, Megan Hicks, Anjana Mebane-Cruz, Reaksha Persaud

School of Global Integrative Studies: Faculty Publications

Barbuda is the sister island to Antigua, located in the Lesser Antilles, West Indies. This island belongs to the Miocene arch of the Lesser Antilles, along with Grande Terre of Guadeloupe, Marie Galante, and Anguilla. Barbuda, notwithstanding its small size and low elevation, has an exceptionally rich past. Recent investigations by a Brooklyn College, City University of New York led team, has discovered evidence of human activity in and around these caves from the Archaic Period down to the present day. The range of activity at these caves begins with scatters of Archaic lithics, through artifacts and faunal material possibly …

Volume 33, Issue 1, Winter 2013 Editorial Matter

Great Plains Quarterly (through 2013)

Cover, masthead, table of contents, News and Notes, and advertisements.

Integrating Biodiversity And Drinking Water Protection Goals Through Geographic Analysis, James D. Wickham, Curtis H. Flather

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

Aim Biodiversity and drinking water share a common interest in land conservation. Our objective was to identify where that common interest occurs geographically to inform conservation planning.

Location The study focused on 2112 eight-digit hydrologic units (watersheds) occurring in the conterminous United States.

Methods Data on aquatic-dependent species occurrence, drinking water intakes, protected land status and land cover change were compiled for each watershed. We compared these four datasets after defining ‘hotspots’ based on attribute-specific thresholds that included (1) the 90th percentile of at-risk aquatic biodiversity, (2) with and without drinking water intakes, (3) above and below the median percentage …