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Articles 121 - 150 of 269
Full-Text Articles in Entire DC Network
Resource-Based Habitat Associations In A Neotropical Liana Community, James W. Dalling, Stefan A. Schnitzer, Claire Baldeck, Kyle E. Harms, Robert John, Scott A. Mangan, Elena Lobo, Joseph B. Yavitt, Stephen P. Hubbell
Resource-Based Habitat Associations In A Neotropical Liana Community, James W. Dalling, Stefan A. Schnitzer, Claire Baldeck, Kyle E. Harms, Robert John, Scott A. Mangan, Elena Lobo, Joseph B. Yavitt, Stephen P. Hubbell
Faculty Publications
Summary: 1.Lianas are a conspicuous element of many tropical forests, accounting for up to 40% of woody stem density and 20% of species richness in seasonal forests. However, lianas have seldom been surveyed at sufficiently large spatial scales to allow an assessment of the importance of habitat variables in structuring liana communities. 2.We compare the association patterns of 82 liana species and an equivalent sample of tree species on the 50ha Forest Dynamics Project plot on Barro Colorado Island, Panama, with topographic habitat variables (high and low plateau, slope, swamp and streamside), and thirteen mapped soil chemical variables. In addition, …
Geospatial Examination Of Lithium In Drinking Water And Suicide Mortality, Marco Helbich, Michael Leitner, Nestor D. Kapusta
Geospatial Examination Of Lithium In Drinking Water And Suicide Mortality, Marco Helbich, Michael Leitner, Nestor D. Kapusta
Faculty Publications
Background: Lithium as a substance occurring naturally in food and drinking water may exert positive effects on mental health. In therapeutic doses, which are more than 100 times higher than natural daily intakes, lithium has been proven to be a mood-stabilizer and suicide preventive. This study examined whether natural lithium content in drinking water is regionally associated with lower suicide rates.Methods: Previous statistical approaches were challenged by global and local spatial regression models taking spatial autocorrelation as well as non-stationarity into account. A Geographically Weighted Regression model was applied with significant independent variables as indicated by a spatial autoregressive model.Results: …
Barbuda: A Caribbean Island In Transition, Andrew Sluyter, Amy E. Potter
Barbuda: A Caribbean Island In Transition, Andrew Sluyter, Amy E. Potter
Faculty Publications
No abstract provided.
The Phylogenetic Distribution And Ecological Role Of Carbon Monoxide Oxidation In The Genus Burkholderia, Carolyn F. Weber, Gary M. King
The Phylogenetic Distribution And Ecological Role Of Carbon Monoxide Oxidation In The Genus Burkholderia, Carolyn F. Weber, Gary M. King
Faculty Publications
Burkholderia is a physiologically and ecologically diverse genus that occurs commonly in assemblages of soil and rhizosphere bacteria. Although Burkholderia is known for its heterotrophic versatility, we demonstrate that 14 distinct environmental isolates oxidized carbon monoxide (CO) and possessed the gene encoding the catalytic subunit of form I CO dehydrogenase (coxL). DNA from a Burkholderia isolate obtained from a passalid beetle also contained coxL as do the genomic sequences of species H160 and Ch1-1. Isolates were able to consume CO at concentrations ranging from 100 ppm (vol/vol) to sub-ambient (< 60 ppb (vol/vol)). High concentrations of pyruvate inhibited CO uptake (> 2.5 mM), but mixotrophic consumption of CO and pyruvate occurred …
Oil-Mediated Mortality And Induced Behavioral Modifications Of Coastal Insects, Benjamin Jacob Adams
Oil-Mediated Mortality And Induced Behavioral Modifications Of Coastal Insects, Benjamin Jacob Adams
LSU Master's Theses
The Deepwater Horizon oil spill affected over one thousand kilometers of the southeastern United States’ coast in the Gulf of Mexico especially Louisiana’s salt marshes. These marshes are a vital part of the state’s economy and coastal ecology; however, the insects residing in this area remain largely unstudied. The goal of my project was to answer specific questions arising from two ongoing investigations of the insects in the oiled marshes. I sampled insects using sweep nets and insect vacuums to determine the most efficient technique to use in the marsh, compared insects collected in oiled and non-oiled marshes, and completed …
The Distribution And Diversity Of Functional Gene Pathways Controlling Sulfur Speciation In Lower Kane Cave, Wyoming, Audrey Tarlton Paterson
The Distribution And Diversity Of Functional Gene Pathways Controlling Sulfur Speciation In Lower Kane Cave, Wyoming, Audrey Tarlton Paterson
LSU Master's Theses
Defining the linkages between microbial metabolic activity and environmental geochemistry can be used to understand how carbonate dissolution in sulfidic karst systems proceeds. In Lower Kane Cave, Wyoming, sulfidic springs support taxonomically distinct microbial communities that are also associated with putative sulfur metabolisms (e.g., oxidation of reduced sulfur compounds, sulfate reduction, and sulfur disproportionation) that influence carbonate dissolution. The distribution of diverse microbial groups in other terrestrial subsurface environments is not well understood, making Lower Kane Cave ideal for study. Molecular genetics techniques were used to uncover diversity of 16S rRNA genes and bacterial soxB and aprA functional genes. Aqueous …
Biomass And Mass Balance Isotope Content Of Mussel Seep Populations, Philip Martin Riekenberg
Biomass And Mass Balance Isotope Content Of Mussel Seep Populations, Philip Martin Riekenberg
LSU Master's Theses
Cold seep mussels, Bathymodiolus childressi, are common cold seep constituents that form large populations at upper continental slope (500-1000 m) cold seep sites in the Northern Gulf of Mexico. These mussels utilize methane present through symbiotic relationships with methanotrophic bacteria. This study uses a coupled isotope technique to determine the relative incorporation of respiratory carbon in the shell as a measure of the availability of methane between different seep sites. This method indicates a higher abundance of methane at the Brine Pool site than at the Bush Hill site which appears significantly more resource limited and that changes in methane …
Function And Diversity Of The Ship, Trinity, And Tiger Shoal Complex, With Emphasis On Macrofauna And Spawning Blue Crabs (Callinectes Sapidus), Carey George Gelpi Jr.
Function And Diversity Of The Ship, Trinity, And Tiger Shoal Complex, With Emphasis On Macrofauna And Spawning Blue Crabs (Callinectes Sapidus), Carey George Gelpi Jr.
LSU Doctoral Dissertations
The ecological and economic value of sandy shoals off the Louisiana coast is not well understood. During three years of comprehensive benthic sampling and environmental measurements I studied the Ship, Trinity, Tiger Shoal Complex (STTSC), which comprises changing and discrete benthic habitats including high relief sandy shoals, and muddier, mostly deeper off-shoal areas, prone to hypoxia. Benthic macrofaunal assemblages of shoals included endemic species, and shoal communities were significantly different from each other and the muddier offshoal habitat, contributing to northern Gulf of Mexico (GoM) regional biodiversity. Sand percentage was the most influential environmental parameter shaping macrofaunal community composition across …
Stroke Mortality And Trends From 1990 To 2006 In 39 Countries From Europe And Central Asia: Implications For Control Of High Blood Pressure, Josep Redon, Michael H. Olsen, Richard S. Cooper, Oscar Zurriaga, Miguel A. Martinez-Beneito, Stephane Laurent, Renata Cifkova, Antonio Coca, Guiseppe Mancia
Stroke Mortality And Trends From 1990 To 2006 In 39 Countries From Europe And Central Asia: Implications For Control Of High Blood Pressure, Josep Redon, Michael H. Olsen, Richard S. Cooper, Oscar Zurriaga, Miguel A. Martinez-Beneito, Stephane Laurent, Renata Cifkova, Antonio Coca, Guiseppe Mancia
Faculty Publications
AimsThe aim of the present study was to extend our understanding of international trends in stroke and major sequelae in Europe and countries peripheral to Europe by assessing: (1) current mortality rates, (2) the most recent 15-year prevalence trends, and (3) the relationship between systolic blood pressure in community surveys and national stroke mortality. Methods and resultsData were obtained from the World Health Organization (WHO www.who.int/whosis/database/mort/table.cfm), and represent national vital statistics as reported by 39 countries (European and Central Asian countries) using a standard format and population-based cardiovascular surveys. Total numbers of deaths by stroke (International Classification of Diseases 430438, …
Fire Ant Decapitating Fly Cooperative Release Programs (1994-2008): Two Pseudacteon Species, P. Tricuspis And P. Curvatus, Rapidly Expand Across Imported Fire Ant Populations In The Southeastern United States, Anne Marie A. Callcott, Sanford D. Porter, Ronald D. Weeks, L. C. Fudd Graham, Seth J. Johnson, Lawrence E. Gilbert
Fire Ant Decapitating Fly Cooperative Release Programs (1994-2008): Two Pseudacteon Species, P. Tricuspis And P. Curvatus, Rapidly Expand Across Imported Fire Ant Populations In The Southeastern United States, Anne Marie A. Callcott, Sanford D. Porter, Ronald D. Weeks, L. C. Fudd Graham, Seth J. Johnson, Lawrence E. Gilbert
Faculty Publications
Natural enemies of the imported fire ants, Solenopsis invicta Buren S. richteri Forel (Hymenoptera: Formicidae), and their hybrid, include a suite of more than 20 fire ant decapitating phorid flies from South America in the genus Pseudacteon. Over the past 12 years, many researchers and associates have cooperated in introducing several species as classical or self-sustaining biological control agents in the United States. As a result, two species of flies, Pseudacteon tricuspis Borgmeier and P. curvatus Borgmeier (Diptera: Phoridae), are well established across large areas of the southeastern United States. Whereas many researchers have published local and state information about …
Tripodfish (Aulopiformes: Bathypterois) Locomotion And Landing Behaviour From Video Observation At Bathypelagic Depths In The Campos Basin Of Brazil, Matthew P. Davis, Prosanta Chakrabarty
Tripodfish (Aulopiformes: Bathypterois) Locomotion And Landing Behaviour From Video Observation At Bathypelagic Depths In The Campos Basin Of Brazil, Matthew P. Davis, Prosanta Chakrabarty
Faculty Publications
A video observation of a deep-sea tripodfish (Aulopiformes: Bathypterois) taken from a remotely-operated vehicle at a depth of 1443 m in the Campos Basin, Brazil is analysed for swimming and landing movements. The observed specimen is identified here as Bathypteroisgrallator, and this record is the first video observation of a tripodfish exhibiting periodic swimming followed by landing in a resting position on deep-sea substrate which we interpret as ‘bathypteroiform’ movement, a locomotive mode unique to taxa within Bathypterois. This observation describes the functional role of the fins associated with landing, including independent movements of the elongated fin ray elements. The …
Mapping And Modeling Of Neglected Tropical Diseases In Brazil And Bolivia, Paula Mischler
Mapping And Modeling Of Neglected Tropical Diseases In Brazil And Bolivia, Paula Mischler
LSU Doctoral Dissertations
Accurately defining disease distributions and calculating disease risk is an important step in the control and prevention of diseases. This study used geographical information systems and remote sensing technologies within the MaxEnt ecological niche modeling program to create predictive risk maps for leprosy and Schistosomiasis in Brazil and Chagas disease in both Brazil and Bolivia. New disease cases were compiled for leprosy, Schistosomiasis, and Chagas disease from the Brazilian ministry of Health for 2001 to 2009 and the data was stratified to a 10,000 population for each municipality. Bolivian Chagas prevalence rates were calculated from 2007 to 2009 survey data. …
Modeling The Population Effects Of Hypoxia On Atlantic Croaker (Micropogonias Undulatus) In The Northwestern Gulf Of Mexico, Sean Brandon Creekmore
Modeling The Population Effects Of Hypoxia On Atlantic Croaker (Micropogonias Undulatus) In The Northwestern Gulf Of Mexico, Sean Brandon Creekmore
LSU Master's Theses
The northwestern Gulf of Mexico currently experiences a large hypoxic area (“dead zone”) during the summer. While the local effects of hypoxia on organisms have been documented, the population-level effects are largely unknown. I developed a spatially-explicit, individual-based model to analyze how hypoxia effects on Atlantic croaker reproduction, growth, and mortality in the northwestern Gulf of Mexico could lead to population-level responses. The model follows the hourly growth, mortality, reproduction, and movement of individuals on a 300 x 800 spatial grid of 1 km2 cells for 100 years. Chlorophyll-a concentration, water temperature, and dissolved oxygen were specified daily for each …
Temporal Changes In Quality Of Life And Environment In New Orleans After Hurricane Katrina, Danielle Johanna Larock
Temporal Changes In Quality Of Life And Environment In New Orleans After Hurricane Katrina, Danielle Johanna Larock
LSU Master's Theses
Understanding and assessing the spatial and temporal changes of quality of life and environment of a community is critical to its sustainable development, especially after a disaster strikes. This study explores an approach that integrates remote sensing with socioeconomic data to assess the temporal changes in quality of life and environment (QOL) using Orleans Parish as an example. Hurricane Katrina, which struck New Orleans in 2005, has had vast implications economically, socially, and environmentally for this city and the surrounding area. Empirically quantifying these concepts will help to rebuild the city more sustainably. This study investigated change in environmental quality …
A Comparative Study Of Salt Tolerance Parameters In 11 Wild Relatives Of Arabidopsis Thaliana, Francesco Orsini, Matilde Paino D'Urzo, Gunsu Inan, Sara Serra, Dong Ha Oh, Michael V. Mickelbart, Federica Consiglio, Xia Li, Jae Cheol Jeong, Dae Jin Yun, Hans J. Bohnert, Ray A. Bressan, Albino Maggio
A Comparative Study Of Salt Tolerance Parameters In 11 Wild Relatives Of Arabidopsis Thaliana, Francesco Orsini, Matilde Paino D'Urzo, Gunsu Inan, Sara Serra, Dong Ha Oh, Michael V. Mickelbart, Federica Consiglio, Xia Li, Jae Cheol Jeong, Dae Jin Yun, Hans J. Bohnert, Ray A. Bressan, Albino Maggio
Faculty Publications
Salinity is an abiotic stress that limits both yield and the expansion of agricultural crops to new areas. In the last 20 years our basic understanding of the mechanisms underlying plant tolerance and adaptation to saline environments has greatly improved owing to active development of advanced tools in molecular, genomics, and bioinformatics analyses. However, the full potential of investigative power has not been fully exploited, because the use of halophytes as model systems in plant salt tolerance research is largely neglected. The recent introduction of halophytic Arabidopsis-Relative Model Species (ARMS) has begun to compare and relate several unique genetic resources …
Laboratory Evaluation Of The Efficacy Of Fluorescent Biomarkers For Sugar-Feeding Sand Flies (Diptera: Psychodidae), T. M. Mascari, L. D. Foil
Laboratory Evaluation Of The Efficacy Of Fluorescent Biomarkers For Sugar-Feeding Sand Flies (Diptera: Psychodidae), T. M. Mascari, L. D. Foil
Faculty Publications
The purpose of this study was to evaluate the use of four fluorescent dyes (rhodamine B, uranine O, auramine O, and erythrosin B) and two nonfluorescent dyes (carmoisine and indigotine) incorporated into sugar baits as biomarkers for phlebotomine sand flies, Each dye could be detected in sand flies fed baits with dye for 24 h when examined using bright field microscopy, although there was considerable variability in the marking produced; all sand flies that had ingested rhodamine B-treated sucrose solution were marked clearly. Sand flies that had ingested sucrose solution containing rhodamine B or uranine O at concentrations as low …
Renegotiating Barbuda's Commons: Recent Changes In Barbudan Open-Range Cattle Herding, Andrew Sluyter, Amy E. Potter
Renegotiating Barbuda's Commons: Recent Changes In Barbudan Open-Range Cattle Herding, Andrew Sluyter, Amy E. Potter
Faculty Publications
Barbuda remains little developed and sparsely populated relative to its neighbors in the Leeward Lesser Antilles, a rather extraordinary and relatively unknown Caribbean place. Much of its distinctiveness derives from the communal land-tenure system, itself rooted in three centuries of open-range cattle herding. Yet, as revealed through interviews, newspaper archives, and landscape observations, openrange cattle herding has declined over the past three decades, with related changes in land tenure. As the new Barbuda Land Act came into effect in 2008, codifying the communal tenure system, the very landscape elements that manifest open-range herding have become obscure. In particular, the rock-walled …
Understanding The Use Of Barrier Islands As Nesting Habitat For Louisiana Birds Of Concern, Cecilia Marie Leumas
Understanding The Use Of Barrier Islands As Nesting Habitat For Louisiana Birds Of Concern, Cecilia Marie Leumas
LSU Master's Theses
Colonial nesting seabirds are threatened by habitat loss and degradation, human disturbance, predation, and climate change. Several species of conservation concern concentrate high percentages of their total U.S. populations in Louisiana breeding colonies. We studied seabirds, including Royal Terns, Sandwich Terns, and Black Skimmers, nesting on Isles Dernieres barrier islands along the Gulf coast of Louisiana. Two of the four islands in this chain host extensive seabird colonies and two do not. We used an experimental approach to test the hypothesis that large terns and skimmers are prevented from nesting on Trinity Island, the largest of the Isles Dernieres, by …
Land Use, Individual Attributes, And Travel Behavior In Baton Rouge, Louisiana, Anzhelika Antipova
Land Use, Individual Attributes, And Travel Behavior In Baton Rouge, Louisiana, Anzhelika Antipova
LSU Doctoral Dissertations
Although the interrelationship between land use and travel behavior was given more than scant attention in the past, urban planners are far from a solution to reduce commuting and travel by car. One of the reasons is that studies of this kind are often conducted at the aggregate scale limiting one’s probabilities of making inferences of individual/household-level travel behavior. Using 1997 Baton Rouge Personal Transportation Survey (BRPTS) data this study attempts to overcome this limitation. First, a multi-level modeling (MLM) approach is applied to investigate the geographical effect of a place and the role of population composition in accounting for …
Patterns Of Habitat Suitability And Abundance Trends Of Current And Candidate Coastal Fish Species Of Concern In Louisiana, Elin Rose Sandy
Patterns Of Habitat Suitability And Abundance Trends Of Current And Candidate Coastal Fish Species Of Concern In Louisiana, Elin Rose Sandy
LSU Master's Theses
Louisiana’s estuaries and coastal waters play an important role in providing habitat for several estuarine-dependent species and also serve as a nursery for the juveniles of several other species. The current rate of land loss in Louisiana and the decline of estuarine-dependent species force us to improve our understanding of the recruitment of these species into Louisiana’s estuaries. Habitat suitabilities were developed for several fish species of concern (SOC) and other estuarine-dependent species across three environmental gradients, abundance patterns were developed for seasons, five-year intervals, and coastal study areas (CSAs). Chi-square analyses and ANOVAs were then used to test for …
The Evolution Of Freeze Tolerance In A Historically Tropical Snail, Alice B. Dennis
The Evolution Of Freeze Tolerance In A Historically Tropical Snail, Alice B. Dennis
LSU Doctoral Dissertations
Geographic range differences among species may result from differences in their physiological tolerances. In the intertidal zone, marine and terrestrial environments intersect to create a unique habitat, across which physiological tolerance strongly influences range. The snail Melampus bidentatus occurs in coastal salt marshes in the western Atlantic and Gulf of Mexico. I have used sequence data from one mitochondrial (CO1) and two nuclear markers (histone H3 and a mitochondrial carrier protein, MCP) to identify three cryptic species within Melampus bidentatus, and to infer their relationships to other Melampus. To identify microhabitat differences between two cryptic species, I modeled their distributions …
Impact Of Reproductive Effort On Survival Of Rio Grande Wild Turkey Meleagris Gallop Intermedia Hens In Texas, Bret A. Collier, Kyle B. Melton, Jason B. Hardin, Nova J. Silvy, Markus J. Peterson
Impact Of Reproductive Effort On Survival Of Rio Grande Wild Turkey Meleagris Gallop Intermedia Hens In Texas, Bret A. Collier, Kyle B. Melton, Jason B. Hardin, Nova J. Silvy, Markus J. Peterson
Faculty Publications
The southeastern portion of the Edwards Plateau of Texas, historically a stronghold of Rio Grande wild turkeys Meleagris gallopavo intermedia, has seen the numbers of turkeys declining since the 1970s. Because hen survival is a key parameter affecting turkey population dynamics, we monitored radio-tagged Rio Grande wild turkey hens on the Edwards Plateau during 2001-2007 to compare survival during the breeding season in areas where turkey abundance has declined vs areas with stable populations. Breeding season survival was best predicted by a model that allowed variation during different periods of the reproductive season (initial nesting during 25 March 21 April, …
Decoupling Development And Energy Flow During Embryonic Diapause In The Cricket, Allonemobius Socius, Julie A. Reynolds, Steven C. Hand
Decoupling Development And Energy Flow During Embryonic Diapause In The Cricket, Allonemobius Socius, Julie A. Reynolds, Steven C. Hand
Faculty Publications
Respiration rate increases 6.3-fold during 15days of post-oviposition development in embryos of the Southern ground cricket, Allonemobius socius. This ontogenetic increase in metabolism of non-diapause insects is blocked during diapause, such that metabolic rate is only 36% of the rate measured for 15 days developing embryos. Surprisingly, however, there is not an acute metabolic depression during diapause entry at the point when developmental ceases (4-5days post-oviposition), as measured by blockage of morphological change and DNA proliferation. The results indicate a decoupling of developmental arrest from metabolism. Both non-diapause and diapause embryos have unusually high [AMP]:[ATP] ratios and low [ATP]:[ADP] ratios …
The Role Of Black Barbudans In The Establishment Of Open-Range Cattle Herding In The Colonial Caribbean And South Carolina, Andrew Sluyter
The Role Of Black Barbudans In The Establishment Of Open-Range Cattle Herding In The Colonial Caribbean And South Carolina, Andrew Sluyter
Faculty Publications
Some significant problems remain in understanding the establishment of open-range cattle herding in the Caribbean and North America, especially regarding the role of blacks in that process. Research to date has identified the Greater Antilles, especially Spanish Cuba and British Jamaica, as the sole Caribbean sources of settlers who established the herding systems of, respectively, Mexico and South Carolina. Yet an open-range cattle herding system also occurred in the British Lesser Antilles, which provided many of the settlers for the South Carolina colony. Archival and field research in Antigua and Barbuda provide the basis for comprehensive reconstruction of that system’s …
Diverse Elevational Diversity Gradients In Great Smoky Mountains National Park, U.S.A., Nathan J. Sanders, Robert R. Dunn, Matthew C. Fitzpatrick, Christopher E. Carlton, Michael R. Pogue, Charles R. Parker, Theodore R. Simons
Diverse Elevational Diversity Gradients In Great Smoky Mountains National Park, U.S.A., Nathan J. Sanders, Robert R. Dunn, Matthew C. Fitzpatrick, Christopher E. Carlton, Michael R. Pogue, Charles R. Parker, Theodore R. Simons
Faculty Publications
© 2010 by Taylor and Francis Group, LLC. Less well studied, however, are the factors that shape elevational diversity gradients. Because many climatic factors vary systematically along elevational gradients, as they might along latitudinal gradients, elevational diversity gradients were thought to be miniature versions of latitudinal gradients (Körner, 2000). For example, Brown (1988) wrote, “Just as change of physical conditions with altitude resembles in many respects the variation with latitude, so the decreasing diversity of most organisms with increasing elevation mirrors in most respects the latitudinal gradient of species richness.” Stevens (1992) noted that, “Biologists have long recognized that elevational …
School Of Renewable Natural Resources Newsletter, Fall 2009, Louisiana State University And Agricultural & Mechanical College
School Of Renewable Natural Resources Newsletter, Fall 2009, Louisiana State University And Agricultural & Mechanical College
Research Matters & RNR Newsletters
The annual newsletter from the School of Renewable Natural Resources was a publication which aimed to update and entertain interested readers with the news and research from RNR faculty, students and staff.
The Effects Of Geomorphology And Primary Productivity On Neotropical Leaf Litter Herpetofauna: Implications For Amazonian Rainforest Conservation, Jessica L. Deichmann
The Effects Of Geomorphology And Primary Productivity On Neotropical Leaf Litter Herpetofauna: Implications For Amazonian Rainforest Conservation, Jessica L. Deichmann
LSU Doctoral Dissertations
The Amazon rainforest encompasses over one billion acres of South America and sustains remarkable biodiversity. Despite the large body of research stemming from this region, little is known about the effects of geomorphology and primary productivity on the fauna of Amazonia, and on reptiles and amphibians in particular. In my dissertation, I examine differences in the abundance, biomass and species richness of secondary consumers in the leaf litter herpetofauna communities on young and ancient soils. Herein, I develop methods to utilize existing data sets and museum collections in new studies involving community biomass. I found that, although the process of …
The Role Of Climate Variability And Riverine Pulsing In The Community Dynamics Of Estuarine Nekton In Breton Sound, Louisiana, Bryan Patrick Piazza
The Role Of Climate Variability And Riverine Pulsing In The Community Dynamics Of Estuarine Nekton In Breton Sound, Louisiana, Bryan Patrick Piazza
LSU Doctoral Dissertations
Climate controls biotic community composition at multiple spatiotemporal scales through variability in environmental control mechanisms (assembly filters). This research investigated the role of climate variability in the community dynamics of estuarine nekton in Breton Sound estuary, Louisiana, and, specifically the effects of El Niño Southern Oscillation (ENSO), freshwater discharge, and a tropical cyclone. A teleconnection was found between ENSO and juvenile brown shrimp (Farfantepenaeus aztecus) abundance in Breton Sound from 1988 – 2007. ENSO affected winter weather conditions (air pressure, temperature and precipitation), and spring brown shrimp abundance in Breton Sound. Juvenile brown shrimp abundance lagged ENSO by …
Distribution, Diversity And Ecology Of Aerobic Carbon Monoxide-Oxidizing Bacteria In Hawaiian Volcanic Deposits, Carolyn Frances Weber
Distribution, Diversity And Ecology Of Aerobic Carbon Monoxide-Oxidizing Bacteria In Hawaiian Volcanic Deposits, Carolyn Frances Weber
LSU Doctoral Dissertations
Carbon monoxide-oxidizing bacteria are among the first colonists of recently formed volcanic deposits despite environmental conditions that challenge their survival, such as oscillating water regimes and lack of endogenous sources of organic carbon and nitrogen. Activity assessments and molecular surveys of the coxL gene (large subunit carbon monoxide dehydrogenase) across a vegetation gradient on a 1959 volcanic deposit on Kilauea Volcano (Hawai’i) indicated that CO-oxidizing communities continue to expand, diversify and remain competitive during ecosystem development. Distinct compositional shifts occurred across the gradient with Firmicutes-like coxL sequences dominating clone libraries from unvegetated sites (Bare) and Proteobacteria coxL sequences dominating libraries …
Motivating Middle School Students To Be Physically Active: The Role Of Supportive Environments, Tao Zhang
Motivating Middle School Students To Be Physically Active: The Role Of Supportive Environments, Tao Zhang
LSU Doctoral Dissertations
It is clearly documented that promoting regular physical activity participation at young ages increases the likelihood that school-aged students will lead active lifestyles as adults. Unfortunately, more than a third of school-aged students do not engage in sufficient amounts of physical activity necessary to produce significant health benefits (USDHHS, 2000, 2008). Public health officials and physical educators highlight the importance of promoting motivation for physical activity by creating a supportive physical activity environment that should positively influence students’ choices to be physically active. The major objective of this dissertation was to explore the roles of supportive social environments and physical …