Digital Commons Network^™

Reproductive Asynchrony Within Social Groups Of Female Eastern Wild Turkeys, Erin E. Ulrey, Michael J. Chamberlain, Bret A. Collier

Faculty Publications

Coordination in timing of reproduction is driven by multiple ecological and sociobiological processes for a wide array of species. Eastern wild turkeys (Meleagris gallopavo silvestris) use a male dominance polygynous mating system, where males communicate with females via elaborate courtship displays and vocalizations at display sites. Most females prefer to mate with dominant males; therefore, asynchronous breeding and nesting may occur which can disproportionately influence individual fitness within breeding groups. For female wild turkeys, there are reproductive advantages associated with earlier nesting. As such, we evaluated reproductive asynchrony within and between groups of GPS-tagged female eastern wild turkeys based on …

Indirect Functional Effects Of Neighbors On Food Web Compartments Could Not Overcome Density-Dependent Limited Growth Of A Grazing Minnow, Garrett W. Hopper, Keith B. Gido, Caryn C. Vaughn

Faculty Publications

Ecosystems include diverse taxonomic and functional groups of animals with variable levels of niche overlap that can lead to direct and indirect interactions with positive or negative outcomes. Species feeding at low trophic positions might be sensitive to interactions with co-occurring functional groups (neighbors) that influence their food resources through various processes, such as indirect nutrient subsidies and trophic cascades. Employing a target-neighbor experimental design using large, outdoor mesocosms, we tested whether adding neighbors with different functional traits affected food web compartments relative to a control group that had grazing minnows, Campostoma anomalum (Central Stoneroller). Additionally, we tested whether growth …

A Simple Trail Camera Modification Reveals Red-Bellied Woodpeckers As Important Egg Predators Of Box-Nesting Wood Ducks, Dylan L. Bakner, Kevin M. Ringelman

Faculty Publications

Artificial nesting structures have been used to aid the recovery and maintenance of certain avian populations such as the wood duck (Aix sponsa). The success of nest boxes for wood ducks relies on excluding common nest predators such as raccoons (Procyon lotor) and rat snakes (Pantherophis spp.) via the use of predator guards; however, woodpeckers cannot be excluded. Red-bellied woodpeckers (Melanerpes carolinus) are foraging generalists and have been anecdotally observed preying on wood duck eggs where documenting predation events is difficult to accomplish through traditional nest box monitoring. Here, we used custom-modified trail cameras to document egg depredations and foraging …

Immune Genotypes, Immune Responses, And Survival In A Wild Bird Population, Martha J. Nelson-Flower, Leanne A. Grieves, Jane M. Reid, Ryan R. Germain, Savo Lazic, Sabrina S. Taylor, Elizabeth A. Macdougall-Shackleton, Peter Arcese

Faculty Publications

Individuals vary in their immune genotype, inbreeding coefficient f, immune responses, survival to adulthood, and adult longevity. However, whether immune genes predict survival or longevity, whether such relationships are mediated through immune responses, and how f affects immune genotype remain unclear. We use a wild song sparrow (Melospiza melodia) population in which survival to adulthood, adult longevity, and f were measured precisely, and in which immune responses have previously been assessed. We investigate four toll-like receptor (TLR) and the major histocompatibility complex (MHC) class IIB exon 2 genes. We test whether immune genes predict fitness (survival to adulthood or adult …

Molecular Research In Rice, Prasanta K. Subudhi

Faculty Publications

No abstract provided.

A Comparison Of Bat Calls Recorded By Two Acoustic Monitors, Jane M. Kunberger, Ashley M. Long

Faculty Publications

Recent advances in low-cost autonomous recording unit (ARU) technology have made large-scale bat monitoring projects more practical, but several key features of ARUs (e.g., microphone quality and triggering thresholds) can influence their ability to detect and record bats. As such, it is important to quantify and report variation in ARU performance as new recording systems become available. We used the automated classification software SonoBat to compare the numbers of call files, echolocation pulses, and species recorded by a commonly used, full-spectrum bat detector-the Song Meter SM4BAT-FS-and a less expensive, open-source ARU that can detect ultrasound-the AudioMoth. We deployed paired ARUs …

Regional Neuroanatomic Effects On Brain Age Inferred Using Magnetic Resonance Imaging And Ridge Regression, Roy J. Massett, Alexander S. Maher, Phoebe E. Imms, Anar Amgalan, Nikhil N. Chaudhari, Nahian F. Chowdhury, Andrei Irimia, Michael W. Weiner, Paul Aisen, Ronald Petersen, Clifford R. Jack, William Jagust, John Q. Trojanowki, Arthur W. Toga, Laurel Beckett, Robert C. Green, Andrew J. Saykin, John C. Morris, Richard J. Perrin, Leslie M. Shaw, Zaven Khachaturian, Maria Carrillo, William Potter, Lisa Barnes, Marie Bernard, Hector González, Carole Ho, John K. Hsiao, Jonathan Jackson, Eliezer Masliah, Donna Masterman, Ozioma Okonkwo, Laurie Ryan, Nina Silverberg

Clinical Research Faculty Publications

The biological age of the brain differs from its chronological age (CA) and can be used as biomarker of neural/cognitive disease processes and as predictor of mortality. Brain age (BA) is often estimated from magnetic resonance images (MRIs) using machine learning (ML) that rarely indicates how regional brain features contribute to BA. Leveraging an aggregate training sample of 3 418 healthy controls (HCs), we describe a ridge regression model that quantifies each region’s contribution to BA. After model testing on an independent sample of 651 HCs, we compute the coefficient of partial determination R̄2p for each regional brain volume to …

Exploring The Experiences Of Pregnant Women In The U.S. During The First Year Of The Covid-19 Pandemic, Courtney E. Williams, Dana Berkowitz, Heather M. Rackin

Faculty Publications

In this paper, we integrate the stress process model with symbolic interactionism to frame our analysis of interviews with 35 women who were pregnant and/or gave birth during the first year of the Covid-19 pandemic. We detail three stressors, highlight their variation, and discuss how they coped with these stressors. Women reported having to navigate contradictory information about the public health crisis, but Black participants simultaneously endured added strain from a heightened awareness of racialized violence. To cope with an overabundance of precarious and contradictory messages, some women sought out information (i.e., information gatherers), others eschewed information (i.e., information avoiders), …

8(Meso)-Pyridyl-Bodipys: Effects Of 2,6-Substitution With Electron-Withdrawing Nitro, Chloro, And Methoxycarbonyl Groups, Caroline Ndung’U, Petia Bobadova-Parvanova, Daniel J. Lamaster, Dylan Goliber, Frank R. Fronczek, Maria Da Graça H. Vicente

Faculty Publications

The introduction of electron-withdrawing groups on 8(meso)-pyridyl-BODIPYs tends to increase the fluorescence quantum yields of this type of compound due to the decrease in electronic charge density on the BODIPY core. A new series of 8(meso)-pyridyl-BODIPYs bearing a 2-, 3-, or 4-pyridyl group was synthesized and functionalized with nitro and chlorine groups at the 2,6-positions. The 2,6-methoxycarbonyl-8-pyridyl-BODIPYs analogs were also synthesized by condensation of 2,4-dimethyl-3-methoxycarbonyl-pyrrole with 2-, 3-, or 4-formylpyridine followed by oxidation and boron complexation. The structures and spectroscopic properties of the new series of 8(meso)-pyridyl-BODIPYs were investigated both experimentally and computationally. The BODIPYs bearing 2,6-methoxycarbonyl groups showed enhanced …

The Distribution Of Surface Soil Moisture Over Space And Time In Eastern Taylor Valley, Antarctica, Mark R. Salvatore, John E. Barrett, Laura E. Fackrell, Eric R. Sokol, Joseph S. Levy, Lily C. Kuentz, Michael N. Gooseff, Byron J. Adams, Sarah N. Power, J. Paul Knightly, Haley M. Matul, Brian Szutu, Peter T. Doran

Faculty Publications

Available soil moisture is thought to be the limiting factor for most ecosystem processes in the cold polar desert of the McMurdo Dry Valleys (MDVs) of Antarctica. Previous studies have shown that microfauna throughout the MDVs are capable of biological activity when sufficient soil moisture is available (~2–10% gravimetric water content), but few studies have attempted to quantify the distribution, abundance, and frequency of soil moisture on scales beyond that of traditional field work or local field investigations. In this study, we present our work to quantify the soil moisture content of soils throughout the Fryxell basin using multispectral satellite …

Contrasting Responses Of Atlantic And Pacific Tropical Cyclone Activity To Atlantic Multidecadal Variability, Huanping Huang, William D. Collins, Christina M. Patricola, Yohan Ruprich-Robert, Paul A. Ullrich, Alexander J. Baker

Faculty Publications

This research assesses the influences of Atlantic Multidecadal Variability (AMV) on global tropical cyclones (TCs) using two large ensembles of idealized global climate model simulations with opposite signs of AMV forcings superimposed (i.e., AMV+ and AMV–). We first detect TCs and then compare TC activity by basin in the two AMV experiments. We find contrasting responses of Atlantic and Pacific TC frequency to the AMV anomalies. Compared to AMV–, AMV+ significantly increases TC frequency in the North Atlantic, including those making landfalls. The increase is explained by warmer sea surface temperature, higher relative humidity, increased relative vorticity, and weaker vertical …

Silica Concentrations In Dominant Vegetation Species Of Wax Lake Delta, Louisiana, Danielle M. Soileau

LSU Master's Theses

Coastal deltaic wetlands colonize dynamic environments and experience fluctuations of salinity, river connectivity, sediment dredging or deposition, and periods of inundation resulting in unique vegetation and soils. Louisiana’s coastline is experiencing enhanced loss of coastal deltaic wetlands in coastal basins where the Mississippi River no longer is connected to waterways and channels that would normally provide freshwater and sediments representing the abandonment phase of the delta cycle. There is a coastal basin in the central regions of the state, the Atchafalaya Bay, that is still in the active phase of delta cycle resulting in the growth of the Wax Lake, …

Synthesis Of An Acinetobacter Baumannii Lipooligosaccharide Subunit, James M. Armstrong Ii

LSU Doctoral Dissertations

Acinetobacter baumannii is a Gram-negative, multi drug-resistant bacterium that was placed on the World Health Organization’s watchlist of drug-resistant bacteria. A. baumannii is an ESKAPE pathogen, one of six increasingly antimicrobial-resistant bacteria that are responsible for nosocomial infections. Alternative therapies, such as vaccines, are required to decrease the world’s reliance on antimicrobial agents. Specifically, glycoconjugate vaccines such as those used against Haemophilus influenzae B, Streptococcus pneumoniae, and Neisseria meningitidis are used globally and are highly effective. These vaccines consist of an antigenic bacterial glycan bound to a carrier protein. The glycan is usually a capsular polysaccharide (CPS), however, the notion …

Computer-Aided Drug Design Of Bakuchiol-Inspired Lxrα Modulators Against Acute Lymphoblastic Leukemia, Dillon P. Cao

LSU Master's Theses

Acute lymphoblastic leukemia (ALL) is the most common type of cancer in children, accounting for approximately 25% of pediatric malignancies. Although glucocorticoids are commonly used to treat ALL, prolonged use can lead to steroid resistance, rendering the drug regimen ineffective. Therefore, alternative treatment avenues are needed for high- risk pediatric patients that do not respond well to traditional regimens.

Liver X Receptor α (LXRα) is presented as a potential alternative drug target for pediatric patients that exhibit suboptimal response to glucocorticoids. Limitations of the current LXRα modulators such as indiscriminate isoform selectivity between LXRα and LXRβ and consequent adverse effects …

Ecology Of Viruses In Marine And Coastal Oxygen-Depleted Waters, Sophie Jurgensen

LSU Doctoral Dissertations

Deoxygenation of marine and coastal waters, both caused and exacerbated by a suite of abiotic and biotic factors, has been documented for more than sixty years. The incidence and severity of low-oxygen areas is predicted to expand globally in the coming decades. Despite their colloquial moniker “dead zones,” low-oxygen areas contain thriving and diverse microorganisms that have significant impacts on global biogeochemical cycles including contributing to positive feedback loops that further expand low-oxygen areas. While the diversity and activity of these microorganisms is beginning to be elucidated, the ecology of their viruses is particularly understudied. In this dissertation, I present …

The Coralhydro2k Database: A Global, Actively Curated Compilation Of Coral Δ18o And Sr/Ca Proxy Records Of Tropical Ocean Hydrology And Temperature For The Common Era, Rachel M. Walter, Hussein R. Sayani, Thomas Felis, Kim M. Cobb, Nerilie J. Abram, Ariella K. Arzey, Alyssa R. Atwood, Logan D. Brenner, Émilie P. Dassié, Kristine L. Delong, Bethany Ellis, Julien Emile-Geay, Matthew J. Fischer, Nathalie F. Goodkin, Jessica A. Hargreaves, K. Halimeda Kilbourne, Hedwig Krawczyk, Nicholas P. Mckay, Andrea L. Moore, Sujata A. Murty, Maria Rosabelle Ong, Riovie D. Ramos, Emma V. Reed, Dhrubajyoti Samanta, Sara C. Sanchez, Jens Zinke

Faculty Publications

The response of the hydrological cycle to anthropogenic climate change, especially across the tropical oceans, remains poorly understood due to the scarcity of long instrumental temperature and hydrological records. Massive shallow-water corals are ideally suited to reconstructing past oceanic variability as they are widely distributed across the tropics, rapidly deposit calcium carbonate skeletons that continuously record ambient environmental conditions, and can be sampled at monthly to annual resolution. Climate reconstructions based on corals primarily use the stable oxygen isotope composition (δ18O), which acts as a proxy for sea surface temperature (SST), and the oxygen isotope composition of seawater (δ18Osw), a …

A History Of The Construction And Financing Of Division I Football Bowl Subdivision And Ivy League Stadia: An Ideal-Type On Financial Modernization, Tiffany E. Demiris

LSU Doctoral Dissertations

This dissertation seeks to introduce financial modernization as a distinct subcategory of modernization and present practical applications for sport managers. Modernization literature has shown that, as society advances, levels of complexity increase. Modernization is generally concerned about the impact of technology, transportation, financial operations, and the reduction of risk in society (Seifried & Novicevic, 2017). These facets are not only important to established modernization subcategories, reflexive and ecological, but are also applicable to financial systems and demonstrate how financial modernization is both complementary and a distinct type of modernization. It is possible to take larger risks over time because so …

My Promise To Nature., Kathleen Mcvea

LSU Master's Theses

My Promise to Nature is a body of work created to emphasize the importance of conserving natural habitats in Louisiana’s Tunica Hills. The decision to do Land Art and select the Tunica Hills as the subject did not come to me right away. Nature and family have been woven throughout my work throughout my time in the M.F.A. program.

This was not out of reach, and I was already extremely passionate about the subject. It might be a pain due to location, but my family owned 400 acres of property in the Tunica Hills with a cabin that they had …

Ross Sea Ocean-Temperature Reconstruction And Marine Radiocarbon Reservoir Effect Calibration From Modern And Pre-Modern Scleractinia, Colby Knight

LSU Master's Theses

Warm Circumpolar Deep Water (CDW) upwelling in the Southern Ocean currently circulates underneath Antarctic ice shelves in many areas. The associated melting reduces the ice-shelf buttressing effect, which can subsequently accelerate flow and cause retreat of grounded and floating ice. Upwelled CDW may have also been a primary driver of post-Last Glacial Maximum (LGM) deglaciation, but there are few proxy data from which upwelling history and paleo-ocean temperatures can be reconstructed. Here we build on previous deep, cold-water coral studies (e.g., Stewart et al., 2020) to detect CDW intrusion on the western Ross Sea continental shelf using lithium-to-magnesium ratios (Li/Mg) …

The Influence Of Selected Personal And Academic Demographic Characteristics On Retention From Fourth To Fifth Semester Of Enrollment Among Traditional-Age Undergraduate Students At A Research Extensive University In The Southern Portion Of The United States, Tammy R. Millican

LSU Doctoral Dissertations

While many Americans may be questioning the value of a college degree due to rising costs, on virtually every measure of economic well-being and career attainment—from personal earnings to job satisfaction to the share employed full time—young college graduates are outperforming their peers with less education. Yet college dropout rates indicate that up to 32.9% of undergraduates do not complete their degree program, which has a financial impact on both students and the universities and colleges where they enroll (Hanson, 2022).

Historically, students who leave college before completing a baccalaureate degree are no better qualified than those with a high …

Maximum Likelihood Estimation Of Glandular Fraction For Mammography, Bryce Smith

LSU Master's Theses

Breast tissue is a mixture of adipose and fibro glandular tissue with a glandular fraction on average of 20%-30%. Previous studies have confirmed that there is a risk of undetected breast cancer related to the amount of glandular tissue present in the breast. Since a higher glandular fraction can lead to an increased cancer risk, it is important for radiologists to know quantitative glandular fraction when diagnosing a patient. Another increasingly popular protocol for mammography is to eliminate the anti-scatter grid and use software algorithms to reduce scatter. This work focuses on using a maximum likelihood algorithm to estimate the …

Androgynous Figures On Etruscan Cista Handles From Praeneste, Melanie Naples

LSU Master's Theses

Muscular women and effeminate men adorn the lids of Etruscan Cistae found in Praeneste (modern Palestrina, 23 miles southeast of Rome, Italy). Cistae (Latin plural of cista) are storage containers used by the Etruscans for women’s beauty items. This thesis focuses on the androgynous, mostly nude, figures that serve as handles and are often displayed in pairs. These pairs frequently depict a man and a woman together and androgynous qualities are usually emphasized on the female figures. Discussions of the androgynous body in the ancient world have centered around Greece and Rome. Only recently (Sandhoff 2007, 2009, 2011), scholarship has …

Exploring Machine Learning In Deep Foundation And Soil Classification Application, Mohammad Moontakim Shoaib

LSU Master's Theses

The applicability of several Machine Learning (ML) models was explored in this research to predict the ultimate capacity and load-settlement behavior of axially loaded single-driven piles from Cone Penetration Test (CPT) data. Additionally, a common CPT-based soil behavior type (SBT) classification system was reproduced using those ML models. Eighty static pile load tests and corresponding CPT data close to those pile locations were collected from 34 sites in Louisiana for the deep foundation application. On the other hand, 70 CPT soundings were taken in 14 different parishes across Louisiana for the soil classification application. Specifically, tree-based ML models such as …

Measuring Food Literacy Among Limited-Resourced Adults, Emelia Clement

LSU Doctoral Dissertations

Food literacy is the interrelated knowledge, skills and behaviors needed to plan and manage, select, prepare, and eat healthy food. It is positively associated with improved consumption of nutritious diets, and can be beneficial to limited-resource adults, who are often at risk for chronic diet-related diseases. Valid instruments for measuring food literacy in this population are scarce but urgently needed. The Eating and Food Literacy Behavior Questionnaire (EFLBQ) can be used to measure food literacy among limited-resource audiences.

Part one of this study aimed to determine the fitness of the EFLBQ to measure food literacy in limited-resource adults. A convenience …

Synthesis And Characterization Of Porphyrin-Encapsulated Nanoparticles: Investigations With Scanning Probe Microscopy, Olajumoke Helen Olubowale

LSU Doctoral Dissertations

Scanning probe microscopy (SPM) encompasses a family of surface measurements that use a sharp probe to “feel” a surface. The tip is scanned point-by-point to build a map of the sample topography, which can be correlated with local measurements of surface properties. This dissertation outlines the history of SPM and describes techniques, operational modes, and applications. A review of force volume mapping (FVM), a 3D characterization mode of SPM used to map material properties detailed. Force volume mapping can be achieved by measuring multiple force measurements point-by-point in a grid pattern. Local properties such as chemical forces, dielectric properties, nanomechanical …

Evaluating Abiotic And Biotic Factors Affecting Plant Succession Processes At Malheur Lake, Beth Boos, Sammy L. King

LSU Master's Theses

Arid wetlands are diverse systems that provide habitat for a variety of flora and fauna, including stopover and breeding habitat for migratory birds. In the western United States, these wetlands support a network of stopover sites on the Pacific Flyway, and due primarily to wetland loss and alterations, these areas are becoming more isolated. Malheur Lake is a shallow endorheic lake in eastern Oregon that supported a robust emergent marsh throughout most of the 20^th century. However, following large scale flooding in the 1980s, emergent vegetation was extirpated and has only reestablished in small patches. Our objective was to …

Alcea, Autumn Johnson

LSU Master's Theses

This exhibition was created with the intent to investigate and celebrate gender fluidity in both nature and humanity by depicting one plant, the hollyhock, whose reproductive parts share a structure that changes from male to female as the plant matures. Alcea consists of prints, drawings, and installations that showcase the hollyhock in each stage of its transition.

The Psychological Impact Of Adolescent Violence Exposure: The Roles Of Coping And Social Support, Kelsey Gnade Coulthard

LSU Doctoral Dissertations

Research demonstrates that children and adolescents experience a wide range of exposure to violence with rates ranging from 20% and 50% (Finkelhor & Dziuba-Leatherman, 1994; Finkelhor et al., 2005; Zimmerman & Posick, 2016). Violence exposure has been associated with several negative outcomes including biological, psychological, family-based, and academic problems. Further, studies have examined potential protective factors that may buffer against these consequences, with inconsistent results surrounding the roles of coping and social support. However, many of these studies use either an overly generalized definition of both violence exposure and/or social support or use very specific type of violence within a …

Sucrose Demand And Essential Value In Mice With Early-Life Exposure To Risperidone, Megan Federoff

LSU Master's Theses

Second-generation antipsychotics (SGAs), such as risperidone, are widely prescribed to children, but the long-term effects of SGA treatment are not well understood. This study investigated the impact of early-life risperidone treatment on sucrose demand in mice in adulthood. Mice were administered risperidone or vehicle from postnatal day (PND) 33 to 60 and trained in adulthood (>PND 120) to nose poke for a sucrose solution reinforcer. The fixed ratio (FR) value (the number of responses required to produce sucrose delivery; the “price” of sucrose) was varied from 1 to 45, and the resulting consumption versus FR value data were analyzed …

Nucleotide-Driven Molecular Sensing Of Monkeypox Virus Through Hierarchical Self-Assembly Of 2d Hafnium Disulfide Nanoplatelets And Gold Nanospheres, Parikshit Moitra, Maria Iftesum, David Skrodzki, Priyanka Paul, Elnaz Sheikh, Jennifer Lynn Gray, Ketan Dighe, Zach Sheffield, Manas Ranjan Gartia, Dipanjan Pan

Faculty Publications

Liquid interfaces facilitate the organization of nanometer-scale biomaterials with plasmonic properties suitable for molecular diagnostics. Using hierarchical assemblage of 2D hafnium disulfide nanoplatelets and zero-dimensional spherical gold nanoparticles, the design of a multifunctional material is reported. When the target analyte is present, the nanocomposites’ self-assembling pattern changes, altering their plasmonic response. Using monkeypox virus (MPXV) as an example, the findings reveal that adding genomic DNA to the nanocomposite surface increases the agglomeration between gold nanoparticles and decreases the π-stacking distance between hafnium disulfide nanoplatelets. Further, this self-assembled nanomaterial is found to have minimal cross-reactivity toward other pathogens and a limit …