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Articles 91 - 120 of 269
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Lithium In Drinking Water And Suicide Mortality: Interplay With Lithium Prescriptions, Marco Helbich, Michael Leitner, Nestor D. Kapusta
Lithium In Drinking Water And Suicide Mortality: Interplay With Lithium Prescriptions, Marco Helbich, Michael Leitner, Nestor D. Kapusta
Faculty Publications
Background: Little is known about the effects of lithium intake through drinking water on suicide. This intake originates either from natural rock and soil elution and/or accumulation of lithium-based pharmaceuticals in ground water. Aims: To examine the interplay between natural lithium in drinking water, prescribed lithium-based pharmaceuticals and suicide in Austria. Method: Spatial Bayesian regressions for males, females and pooled suicide mortality rates were estimated. Results: Although the expected inverse association between lithium levels in drinking water and suicide mortality was confirmed for males and for total suicide rates, the relationship for females was not significant. The models do not …
Identifying Environmental Controls On The Shoreline Of A Natural River Delta, N. Geleynse, M. Hiatt, H. Sangireddy, P. Passalacqua
Identifying Environmental Controls On The Shoreline Of A Natural River Delta, N. Geleynse, M. Hiatt, H. Sangireddy, P. Passalacqua
Faculty Publications
No abstract provided.
Fuels And Fires Influence Vegetation Via Above- And Belowground Pathways In A High-Diversity Plant Community, Paul R. Gagnon, Heather A. Passmore, Matthew Slocum, Jonathan A. Myers, Kyle E. Harms, William J. Platt, C. E.Timothy Paine
Fuels And Fires Influence Vegetation Via Above- And Belowground Pathways In A High-Diversity Plant Community, Paul R. Gagnon, Heather A. Passmore, Matthew Slocum, Jonathan A. Myers, Kyle E. Harms, William J. Platt, C. E.Timothy Paine
Faculty Publications
© 2015 British Ecological Society. Fire strongly influences plant populations and communities around the world, making it an important agent of plant evolution. Fire influences vegetation through multiple pathways, both above- and belowground. Few studies have yet attempted to tie these pathways together in a mechanistic way through soil heating even though the importance of soil heating for plants in fire-prone ecosystems is increasingly recognized. Here we combine an experimental approach with structural equation modelling (SEM) to simultaneously examine multiple pathways through which fire might influence herbaceous vegetation. In a high-diversity longleaf pine groundcover community in Louisiana, USA, we manipulated …
Are Receptor Concentrations Correlated Across Tissues Within Individuals? A Case Study Examining Glucocorticoid And Mineralocorticoid Receptor Binding, Christine R. Lattin, Daniel E. Keniston, J. Michael Reed, L. Michael Romero
Are Receptor Concentrations Correlated Across Tissues Within Individuals? A Case Study Examining Glucocorticoid And Mineralocorticoid Receptor Binding, Christine R. Lattin, Daniel E. Keniston, J. Michael Reed, L. Michael Romero
Faculty Publications
Copyright © 2015 by the Endocrine Society. Hormone receptors are a necessary (although not sufficient) part of the process through which hormones like corticosterone create physiological responses. However, it is currently unknown to what extent receptor concentrations across different target tissues may be correlated within individual animals. In this study, we examined this question using a large dataset of radioligand binding data for glucocorticoid receptors (GRs) and mineralocorticoid receptors (MRs) in 13 different tissues in the house sparrow (Passer domesticus) (n = 72). Our data revealed that individual house sparrows tended to exhibit higher or lower receptor binding across all …
The Effects Of Tropical Storms And Hurricanes On Phytoplankton And Nutrient Concentrations In Wetland-Estuary Transition Zones Along The Gulf Coast, Tiffany Chantelle Johnson
The Effects Of Tropical Storms And Hurricanes On Phytoplankton And Nutrient Concentrations In Wetland-Estuary Transition Zones Along The Gulf Coast, Tiffany Chantelle Johnson
LSU Master's Theses
Two consecutive storms made landfall along the Northern Gulf of Mexico on June and August 2012 (Tropical Storm Debby, 06/26/2012; Isaac, 08/28/2012, Category (Cat) 1 Saffir-Simpson Hurricane Scale). Each storm passed within 48 to 273 km of one of seven wetland-estuary transition zone sampling sites, and indirect storm effects associated with changes in freshwater discharge and an inflow of inorganic nutrients were observed at five of the seven sites. To assess the impacts of the 2012 hurricanes on hydrology, nutrient concentrations, and phytoplankton concentrations at transition zones along the Gulf Coast, a within-sites analysis along with a seasonal analysis were …
Civic Community, Structural Disadvantage, And Suicide: An Ecological Analysis Of Middle-Age Non-Hispanic White Male Suicide Across The Rural-Urban Continuum, Kayla R. Fontenot
Civic Community, Structural Disadvantage, And Suicide: An Ecological Analysis Of Middle-Age Non-Hispanic White Male Suicide Across The Rural-Urban Continuum, Kayla R. Fontenot
LSU Doctoral Dissertations
This dissertation is a county-level sociological examination of middle-age (35-64) non-Hispanic white male suicides. Although an extensive amount of literature exists on ecological suicide, studies have largely ignored the correlates of suicide among this population group because this stage of the life course has historically demonstrated relatively low and stable rates of suicide. However, suicide rates among middle-age adults have increased dramatically over the last decade, calling for an examination of the correlates of suicide specific to this group. Moreover, the extant suicide literature has largely ignored the possibility of a structural disadvantage-suicide link, as well as the influence of …
Dendrotempestology: Identifying The Statistical Relationship Between Hurricanes And Tree Growth In The Pine Savannas Of Coastal Mississippi, Clay Stephens Tucker
Dendrotempestology: Identifying The Statistical Relationship Between Hurricanes And Tree Growth In The Pine Savannas Of Coastal Mississippi, Clay Stephens Tucker
LSU Master's Theses
Hurricanes cause massive destruction of property and land through high wind speeds, high precipitation, and flooding from storm surge inundation. Hurricane Katrina produced nearly an 8.5 meter-high storm surge at Pass Christian, Mississippi. The envelope of high water from Hurricane Katrina covered a large area of the Gulf Coast including, but not limited to, the area from the Atchafalaya Bay in Louisiana to Mobile Bay in Alabama. This study assesses the relationship between hurricane characteristics (i.e., storm surge and maximum wind) and tree growth using coastal pine tree cores taken in Grand Bay National Estuarine Research Reserve (GBNERR). GBNERR, an …
Site-Specific Habitat And Landscape Associations Of Rusty Blackbirds Wintering In Louisiana, Sinead Mary Borchert
Site-Specific Habitat And Landscape Associations Of Rusty Blackbirds Wintering In Louisiana, Sinead Mary Borchert
LSU Master's Theses
The Rusty Blackbird (Euphagus carolinus) has gained notoriety in recent years as one of the fastest declining North American bird species, with a global population loss of as much as 95%. Causes of the decline are not completely understood, but the high rate of forested wetland change in the southeastern United States suggests that wintering habitat degradation may be a primary driver. To better inform management on critical wintering grounds, I surveyed 68 sites in Louisiana where Rusty Blackbirds had been known to occur to address how occupancy changes with habitat type and colonization and extinction rates vary with ground …
Investigations Into Ecogeomorphodynamics Of Coastal Embryo Dunes At Padre Island National Seashore, Texas, Katherine Anne Renken
Investigations Into Ecogeomorphodynamics Of Coastal Embryo Dunes At Padre Island National Seashore, Texas, Katherine Anne Renken
LSU Doctoral Dissertations
This dissertation is an investigation into the interplay between vegetation and aeolian processes in the coastal embryo dune environment at Padre Island National Seashore, Texas. Vegetation is a geomorphic agent, altering aeolian process dynamics. This research adopted a three-pronged approach to improving our understanding of ecogeomorphodynamics in the coastal environment. The first study analyzed large-scale spatiotemporal trends in the vegetation community of the embryo dune environment in order to contextualize smaller scale aeolian processes. Results of this study demonstrated that there was a clear transition in community assemblage from the seaward edge of the embryo dune zone, where species functioned …
Coastal Lagoons And Estuaries In Mexico: Processes And Vulnerability, Victor F. Camacho-Ibar, Victor H. Rivera-Monroy
Coastal Lagoons And Estuaries In Mexico: Processes And Vulnerability, Victor F. Camacho-Ibar, Victor H. Rivera-Monroy
Faculty Publications
No abstract provided.
A Conceptual Framework For Analyzing Social-Ecological Models Of Emerging Infectious Diseases, Melissa L. Finucane, Jefferson Fox, Sumeet Saksena, James H. Spencer
A Conceptual Framework For Analyzing Social-Ecological Models Of Emerging Infectious Diseases, Melissa L. Finucane, Jefferson Fox, Sumeet Saksena, James H. Spencer
Faculty Publications
Unraveling mechanisms that underlie new and reemerging infectious diseases (EID) requires exploring complex interactions within and among coupled natural and human (CNH) systems. This scientifi c problem poses one of the most diffi cult challenges for society today (Wilcox and Colwell 2005 ). EID are diseases that have recently increased in incidence or in geographic or host range (e.g., tuberculosis, cholera, malaria, dengue fever), and diseases caused by new pathogens and new variants assigned to known pathogens (e.g., HIV, SARS, Nipah virus, and avian infl uenza) (Morse 2005 ). Wilcox and Gubler ( 2005 ) and Wilcox and Colwell ( …
An Integrative Approach To Understanding Host-Parasitoid Population Dynamics In Real Landscapes, James T. Cronin, John D. Reeve
An Integrative Approach To Understanding Host-Parasitoid Population Dynamics In Real Landscapes, James T. Cronin, John D. Reeve
Faculty Publications
Many of our advances regarding the spatial ecology of predators and prey have been attributed to research with insect parasitoids and their hosts. Host-parasitoid systems are ideal for spatial-ecological studies because of the small size of the organisms, the often discrete distribution of their resources, and the relative ease with which host mortality from parasitoids can be determined. We outline an integrated approach to studying host-parasitoid interactions in heterogeneous natural landscapes. This approach involves conducting experiments to obtain critically important information on dispersal and boundary behavior of the host and parasitoid, large-scale manipulations of landscape structure to reveal the impacts …
Dgge Analysis Of Denitrifying Bacterial Diversity In Response To Nutrients And Oil Contamination In Salt Marshes, Catalina Restrepo
Dgge Analysis Of Denitrifying Bacterial Diversity In Response To Nutrients And Oil Contamination In Salt Marshes, Catalina Restrepo
LSU Master's Theses
Salt marsh ecosystems located at the Mississippi River delta are exposed to high levels of point and nonpoint sources of nutrients such as nitrate-based fertilizers and to oil spills in the Gulf of Mexico. However, there is little information on the effects of eutrophication and oil contamination on the bacterial diversity of denitrifying bacteria in salt marsh sediments of coastal Louisiana. The effects of excess nutrients on the bacterial diversity of denitrifiers were analyzed by injecting sediment cores with high concentrations of nitrate (100μM NO3- and 20,000μM NO3-) and carbon (0% and 20% C concentration from the original sample). After …
Preliminary Multifactorial Analysis Of Parkinson's Disease, Max James Miller
Preliminary Multifactorial Analysis Of Parkinson's Disease, Max James Miller
LSU Master's Theses
Neurodegenerative disorders affect millions of Americans every year. Incidence increases as the human population ages. Parkinson’s Disease, a neurodegenerative disorder in the dopaminergic system of the basal ganglia, causes deterioration of movement as the disease progresses. Researchers have attempted to figure out what causes PD and are currently examining it as an environmental disease. This study examined PD as an environmental disease using a multifactorial approach. Methods included 1) utilization of hospital and mortality records in order to investigate a relationship between occupation and PD 2) using ArcGIS 10.2 technology to examine the spatial components of PD 3) conducting Chi-Square …
A Revision And Phylogenetic Analysis Of The Genus Eutyphlus Leconte (Coleoptera: Staphylinidae: Pselaphinae) With A Comparison Of Sampling Methodologies, Brittany Elin Owens
A Revision And Phylogenetic Analysis Of The Genus Eutyphlus Leconte (Coleoptera: Staphylinidae: Pselaphinae) With A Comparison Of Sampling Methodologies, Brittany Elin Owens
LSU Master's Theses
My thesis research includes three components: (1) a methodology project, (2) a systematic project comprising a taxonomic revision, and (3) a morphology-based, cladistic analysis. 1. The methodological study compared the Winkler (Moczarski) eclector and the Berlese-Tullgren funnel (referred to hereafter as “Winkler” and “Berlese” funnels, respectively) as methods for extracting forest litter-dwelling Coleoptera from sifted substrate, with a focus on relevance for taxonomic studies. A general review of the history and methodologies of leaf litter arthropod extraction was provided, in conjunction with repeated, timed trials to compare the relative effectiveness of the two methods using litter samples from various geographic …
North American Lyme Borreliae: New Distributions And An Insight Into Borrelia Bissettii Infection, Immune Response And Transmission In A Murine Model, Brian Francis Leydet Jr
North American Lyme Borreliae: New Distributions And An Insight Into Borrelia Bissettii Infection, Immune Response And Transmission In A Murine Model, Brian Francis Leydet Jr
LSU Doctoral Dissertations
Lyme borreliosis is an emergent threat to human health. It is estimated that 300,000 cases of Lyme disease are diagnosed annually in the United States. In recent years, non-traditional areas are starting to report more and more cases. While much research has gone into the tick and bacteria responsible for the disease, frequently new Borrelia species are being described and implicated in human illness. These species often go unstudied, and their threat to human health is not known. In the hopes of closing knowledge gaps on Lyme borreliosis in the US, we surveyed a non-endemic state, Louisiana, for Lyme Borrelia …
Web-Based Computational Tools For Studying Plant Biodiversity, Timothy Mark Jones
Web-Based Computational Tools For Studying Plant Biodiversity, Timothy Mark Jones
LSU Doctoral Dissertations
Large scale plant biodiversity bioinformatics projects are now making taxonomic datasets available at a frenetic pace via the World Wide Web (WWW). While these new resources provide the fundamental textual and visual backbone of expert level knowledge, their information structure often impedes the development of derivative works for identification. But when this information is rearranged from a traditional format, questions can be asked of the data that were previously thought to be unanswerable. The difficulty in transforming this ‘big-data’ is manifold: how to deliver it rapidly to researchers across the world while providing visualizations of data that encompass these large …
Physical Activity Does Not Influence Obesity Risk: Time To Clarify The Public Health Message, Amy Luke, Richard S. Cooper
Physical Activity Does Not Influence Obesity Risk: Time To Clarify The Public Health Message, Amy Luke, Richard S. Cooper
Faculty Publications
No abstract provided.
Host-Microbe Interactions In Caenorhabditis Elegans, Rui Zhang, Aixin Hou
Host-Microbe Interactions In Caenorhabditis Elegans, Rui Zhang, Aixin Hou
Faculty Publications
No abstract provided.
Developing Models Of Disease Transmission: Insights From Ecological Studies Of Insects And Their Baculoviruses, Bret D. Elderd
Developing Models Of Disease Transmission: Insights From Ecological Studies Of Insects And Their Baculoviruses, Bret D. Elderd
Faculty Publications
No abstract provided.
Biotechnology For Mechanisms That Counteract Salt Stress In Extremophile Species: A Genome-Based View, Ray A. Bressan, Hyeong Cheol Park, Francesco Orsini, Dong Ha Oh, Maheshi Dassanayake, Gunsu Inan, Dae Jin Yun, Hans J. Bohnert, Albino Maggio
Biotechnology For Mechanisms That Counteract Salt Stress In Extremophile Species: A Genome-Based View, Ray A. Bressan, Hyeong Cheol Park, Francesco Orsini, Dong Ha Oh, Maheshi Dassanayake, Gunsu Inan, Dae Jin Yun, Hans J. Bohnert, Albino Maggio
Faculty Publications
Molecular genetics has confirmed older research and generated new insights into the ways how plants deal with adverse conditions. This body of research is now being used to interpret stress behavior of plants in new ways, and to add results from most recent genomics-based studies. The new knowledge now includes genome sequences of species that show extreme abiotic stress tolerances, which enables new strategies for applications through either molecular breeding or transgenic engineering. We will highlight some physiological features of the extremophile lifestyle, outline emerging features about halophytism based on genomics, and discuss conclusions about underlying mechanisms. © 2012 Korean …
Checklist Of Insects Associated With Salvinia Minima Baker In Louisiana, Usa, Katherine A. Parys, Matthew L. Gimmel, Seth J. Johnson
Checklist Of Insects Associated With Salvinia Minima Baker In Louisiana, Usa, Katherine A. Parys, Matthew L. Gimmel, Seth J. Johnson
Faculty Publications
This study presents a list of adult insects (excluding Diptera and Lepidoptera) collected from an infestation of an invasive aquatic weed, common salvinia (Salvinia minima Baker), in southern Louisiana, USA. Insects were sampled from May - November of 2009 and 2010 using floating pitfall traps. A total of 7,933 specimens were collected, representing seven orders, 70 families, and 235 species. Species of note include three currently undescribed species of Coleoptera, one previously undescribed braconid wasp, two new state records of Curculionidae, a new state generic record for the family Limnichidae, and a new record for the United States. © 2013 …
The Feasibility Of Using Vanadium And Nickel To Track Oil Spills In Coastal Environments, Sean Patrick Kenny
The Feasibility Of Using Vanadium And Nickel To Track Oil Spills In Coastal Environments, Sean Patrick Kenny
LSU Master's Theses
Crude oil has been increasing in world demand over the past century. It is known that oil is resistant to weathering processes and if spilled, can cause serious environmental damage to an area, on land or sea. A complementary approach to current methods of tracking oil and identifying spill-impacted sediments may be to measure trace metals associated with crude oil. Trace metals, such a vanadium (V) and nickel (Ni) are known to be elevated in concentration in some oil sources, but little work has been done on this topic. This research explored less expensive and time-consuming methods to track or …
Impacts Of Artificial Reef Addition On The Nekton Community Of Louisiana Marsh Ponds: A Before-After-Control-Impact Analysis, Kari Elizabeth Klotzbach
Impacts Of Artificial Reef Addition On The Nekton Community Of Louisiana Marsh Ponds: A Before-After-Control-Impact Analysis, Kari Elizabeth Klotzbach
LSU Master's Theses
Louisiana’s coastal estuaries are dynamic, highly variable environments that provide nursery areas for numerous recreationally and commercially important species. Louisiana’s coastline is constantly changing due to natural and anthropogenic processes, and it is important to know how nektonic species are impacted by such changes. This study sought to assess the effects of introducing a hard substrate artificial reef on the nekton community of a Louisiana estuary. A before-after-control-impact (BACI) design was used to assess the impacts of artificial reef addition on nektonic fishes and crustaceans in four shallow marsh ponds near Empire, Louisiana. Marsh ponds were sampled by purse seine …
Emergent Irrigation Agriculture And Settlement Patterns In The Lower Nepeña Valley, North-Central Coast Of Peru, Caitlyn Yoshiko Mcnabb
Emergent Irrigation Agriculture And Settlement Patterns In The Lower Nepeña Valley, North-Central Coast Of Peru, Caitlyn Yoshiko Mcnabb
LSU Master's Theses
The Andes is one of many regions thought to have developed as a pristine hydraulic state; thus the region serves as a testing ground for theories on the development of irrigation. Since Wittfogel (1957) proposed a correlation between irrigation and the development of pristine states, the relationships between social organization, political power, and coordinated subsistence strategies have been hotly debated. This research will examine the role of irrigation in the transition to early urban settlements in the Nepeña Valley, on the north-central coast of Peru. I especially focus on the nature of political structure and social organization, examining the validity …
Characterization Of Epibenthic And Demersal Megafauan At Mississippi Canyon 252 Following The Deepwater Horizon Oil Spill, Marla Maxine Valentine
Characterization Of Epibenthic And Demersal Megafauan At Mississippi Canyon 252 Following The Deepwater Horizon Oil Spill, Marla Maxine Valentine
LSU Master's Theses
Increased demand for new sources of oil and gas has resulted in an expansion of drilling into deeper waters. With this exploratory drilling come increased risks, which were realized on April 20, 2010 when the blow out preventer on the Macondo Well failed, resulting in the release of a large quantity of oil and gas into the Northern Gulf of Mexico from a bathypelagic source. This unprecedented environmental disaster was coined the Deepwater Horizon Oil Spill by the popular news media. In the months that followed the spill, the lack of knowledge about the pre-spill condition of deep-sea communities in …
Some Effects Of Nutrient And Flooding Stress Manipulation On Coastal Louisiana Wetland Vegetation, James Stephen Ialeggio
Some Effects Of Nutrient And Flooding Stress Manipulation On Coastal Louisiana Wetland Vegetation, James Stephen Ialeggio
LSU Master's Theses
Freshwater diversions are a relatively recently utilized tool in wetland loss mitigation that stimulate an organic accretion response in marsh vegetation, which is based in root production and thus belowground biomass. The effectiveness of freshwater diversions in slowing marsh loss probably varies across a gradient of the factors they supply: decreased salinity, increased nutrient concentrations, and increased inundation. Flooding stress is commonly thought to be the overriding factor limiting wetland vegetation growth, however its influence may vary across salinity and nutrients. Therefore, plugs of Spartina patens were planted in four “marsh organs” consisting each of 36 sediment-filled PVC pipes of …
Community Resilience To Coastal Hazards : An Analysis Of Two Geographical Scales In Louisiana, Chi Li
Community Resilience To Coastal Hazards : An Analysis Of Two Geographical Scales In Louisiana, Chi Li
LSU Master's Theses
Quantifying resilience is difficulties due to the different definitions of resilience, the interchangeable uses with two other terms “vulnerability” and “adaptability”, as well as the lack of consensus on what indicators should be selected to quantifying resilience. This thesis research studied the community resilience in Louisiana by applying the Resilience Inference Measurement (RIM) model at two geographic levels: county level and zip code level. The RIM model accesses resilience by using three dimensions (exposure, damage, and recovery) and two abilities (vulnerability and adaptability). The types of coastal hazards included in this study were: coastal, flooding, hurricane/tropical storm, tornado, and severe …
An Ecological Analysis Of Us County-Level Suicide Rates : An Application Of Spatial Patterning Models, Chantel Dufrene Chauvin
An Ecological Analysis Of Us County-Level Suicide Rates : An Application Of Spatial Patterning Models, Chantel Dufrene Chauvin
LSU Doctoral Dissertations
Suicide has been studied sociologically since the late 19th century when theorists like Durkheim ([1897] 1951) found that the spatial patterning of suicides was not random. Looking beyond psychological troubles, suicide studies began to address the social factors that affected suicide rates. Building on the work of early scholars, contemporary studies mainly focus on variations in levels of social integration variables within communities to explain the nature of suicide rates. Many of these contemporary studies, however, only consider one type of social integration, like religion, and how variations in participation affect the suicide rate. To date, no study simultaneously considers …
Effects Of Physicochemical Properties And Macrohabitat On The Foraging Ecology And Condition Of The Centrarchid Assemblage Of The Atchafalaya River Basin, Louisiana, Brett A. Miller
LSU Master's Theses
The Atchafalaya River Basin (ARB), Louisiana supports a diverse centrarchid assemblage, characterized by abundant populations of largemouth bass Micropterus salmoides, black crappie Pomoxis nigromaculatus, warmouth Lepomis gulosus, bluegill Lepomis macrochirus, redspotted sunfish Lepomis miniatus, longear sunfish Lepomis megalotis and redear sunfish Lepomis microlophus. This dynamic floodplain ecosystem is comprised of a mosaic of macrohabitats, including natural bayous, shallow lakes, dead-end and open pipeline canals. I conducted an extensive feeding ecology study to determine the influence of these macrohabitats on foraging activity through stomach content and stable isotope analyses. I collected 2,036 centrarchids with electrofishing efforts in the summers of 2011 …