Digital Commons Network^™

Net Land Gain Or Loss For Two Mississippi River Diversions: Caernarvon And Davis Pond, R. Eugene Turner, M Layne, Y Mo, E M. Swenson

Faculty Publications

Coastal wetland restoration can be complex and expensive, so knowing long-term consequences makes it important to inform decisions about if, when, and where to conduct restoration. We determined temporal changes in land gain and loss in receiving basins and adjacent reference areas for two diversions of the Mississippi River in south Louisiana (Davis Pond and Caernarvon initiated in 1991 and 2002, respectively). Water from both diversions went into receiving basins with vegetated areas as did the adjoining reference areas. The results from two different types of satellite imagery analyses demonstrate a net land loss after diversions began. The results were …

The Tensile Root Strength Of Spartina Patens Varies With Soil Texture And Atrazine Concentration, L O. Hollis, R. Eugene Turner

Faculty Publications

The widely used agricultural herbicide atrazine enters wetlands and may potentially affect wetland plants that provide critical reinforcement of soil strength and contribute to ecosystem stability in ways that may vary among soil types. We conducted greenhouse experiments using four levels of atrazine doses and three different soil textures to test for differences between control and experimental treatments and interactive effects of soil texture and atrazine exposure by using the tensile root strength of the coastal wetland emergent macrophyte Spartina patens as the response variable. The tensile root strength of S. patens was not affected after 50days of atrazine exposure …

Oiling Of The Continental Shelf And Coastal Marshes Over Eight Years After The 2010 Deepwater Horizon Oil Spill, R. Eugene Turner, N N. Rabalais, E B. Overton, B M. Meyer, E M. Swenson, M Besonen, M L. Parsons, J Zingre

Faculty Publications

We measured the temporal and spatial trajectory of oiling from the April, 2010, Deepwater Horizon oil spill in water from Louisiana's continental shelf, the estuarine waters of Barataria Bay, and in coastal marsh sediments. The concentrations of 28 target alkanes and 43 target polycyclic aromatic hydrocarbons were determined in water samples collected on 10 offshore cruises, in 19 water samples collected monthly one km offshore at 13 inshore stations in 2010 and 2013, and in 16-60 surficial marsh sediment samples collected on each of 26 trips. The concentration of total aromatics in offshore waters peaked in late summer, 2010, at …

Comment On Legacy Nitrogen May Prevent Achievement Of Water Quality Goals In The Gulf Of Mexico, T C. Ballard, A M. Michalak, G F. Mcisaac, N N. Rabalais, T C. Ballard

Faculty Publications

Van Meter et al. (Reports, 27 April 2018, p. 427) warn that achieving nitrogen reduction goals in the Gulf of Mexico will take decades as a result of legacy nitrogen effects. We discuss limitations of the modeling approach and demonstrate that legacy effects ranging from a few years to decades are equally consistent with observations. The presented time scales for system recovery are therefore highly uncertain.

Advocating For Science: Amici Curiae Brief Of Wetland And Water Scientists In Support Of The Clean Water Rule, R C. Gardner, E Okuno, S Tai, M S. Fennessy, R C. Gardner, M L. Otte, M Palmer, J E. Perry, C Simenstad, B R. Tanner, D Tufford, R. Eugene Turner, K Work, S C. Yaich, J B. Zedler

Faculty Publications

The Trump administration has proposed replacing the Clean Water Rule, a 2015 regulation that defined the statutory term waters of the United States to clarify the geographic jurisdiction of the Clean Water Act. Since its promulgation, the Clean Water Rule has been subjected to numerous judicial challenges. We submitted an amici curiae brief to the United States Court of Appeals for the Sixth Circuit, explaining why the Clean Water Rule, and its definition of waters of the United States, is scientifically sound. The definition of waters of the United States is a legal determination informed by science. The best available …

Feedback Of Coastal Marshes To Climate Change: Long-Term Phenological Shifts, Y Mo, M S. Kearney, R. Eugene Turner

Faculty Publications

Coastal marshes are important carbon sinks facing serious threats from climatic stressors. Current research reveals that the growth of individual marsh plants is susceptible to a changing climate, but the responses of different marsh systems at a landscape scale are less clear. Here, we document the multi-decadal changes in the phenology and the area of the extensive coastal marshes in Louisiana, USA, a representative of coastal ecosystems around the world that currently experiencing sea-level rise, temperature warming, and atmospheric CO2 increase. The phenological records are constructed using the longest continuous satellite-based record of the Earth's ecosystems, the Landsat data, and …

Multi-Decadal Trends And Influences On Dissolved Organic Carbon Distribution In The Barataria Basin, Louisiana From In-Situ And Landsat/Modis Observations, B. Liu, E.J. D'Sa, I. Joshi

Faculty Publications

No abstract provided.

Oceanic Internal Waves In The Sulu-Celebes Sea Under Sunglint And Moonglint, B. Liu, E.J. D'Sa

Faculty Publications

No abstract provided.

Mechanisms Of Organic Matter Export In Estuaries With Contrasting Carbon Sources, A.R. Arellano, T.S. Bianchi, C.L. Osburn, E.J. D'Sa, N.D. Ward, D. Oviedo-Vargas, I.D. Joshi, D.S. Ko, M.R. Shields, G. Kurian, J. Green

Faculty Publications

No abstract provided.

Extent Of The Annual Gulf Of Mexico Hypoxic Zone Influences Microbial Community Structure, L.G. Campbell, J.C. Thrash, N.N. Rabalais, O.U. Mason

Faculty Publications

No abstract provided.

A Hydrodynamic Model For Galveston Bay And The Shelf In The Northern Gulf Of Mexico, J. Du, K. Park, J. Shen, Y.J. Zhang, X. Yu, F. Ye, Z. Wang, N.N. Rabalais

Faculty Publications

No abstract provided.

Resuscitation Of Microalgae From Mississippi River Plume Sediments, Chase C. Chaplin, Marnie Tabor, Israel A. Marquez, Kanchan Maiti, Jeffrey W. Krause

Faculty Publications

No abstract provided.

Effects Of Temperature And Salinity On Body Fluid Dynamics And Metabolism In The Estuarine Diamondback Terrapin (Malaclemys Terrapin), Amanda Southwood Williard, Leigh Anne Harden, T. Todd Jones, Stephen R. Midway

Faculty Publications

The diamondback terrapin is the only temperate turtle species that exclusively inhabits estuarine environments. Morphological, behavioral and physiological features contribute to the terrapin’s ability to regulate body fluid osmotic pressure in a euryhaline environment. Low integument permeability combined with aquatic–terrestrial shuttling behavior limits passive exchange of water and salts with the environment, and terrapins regulate active uptake of salts via alterations in drinking and feeding behavior. The lachrymal salt gland facilitates excretion of excess sodium (Na⁺) and chloride (Cl⁻) ions through active transport mechanisms. We investigated body fluid dynamics, oxygen consumption (V O2) and osmotic status …

Mangrove Canopy Height Globally Related To Precipitation, Temperature And Cyclone Frequency, Marc Simard, Lola Fatoyinbo, Charlotte Smetanka, Victor H. Rivera-Monroy, Edward Castañeda-Moya, Nathan Thomas, Tom Van Der Stocken

Faculty Publications

Mangrove wetlands are among the most productive and carbon-dense ecosystems in the world. Their structural attributes vary considerably across spatial scales, yielding large uncertainties in regional and global estimates of carbon stocks. Here, we present a global analysis of mangrove canopy height gradients and aboveground carbon stocks based on remotely sensed measurements and field data. Our study highlights that precipitation, temperature and cyclone frequency explain 74% of the global trends in maximum canopy height, with other geophysical factors influencing the observed variability at local and regional scales. We find the tallest mangrove forests in Gabon, equatorial Africa, where stands attain …

Biophysical Submesoscale Processes In Thewake Of Hurricane Ivan: Simulations And Satellite Observations, Travis A. Smith, Jason K. Jolliff, Nan D. Walker, Stephanie Anderson

Faculty Publications

Tropical cyclone induced phytoplankton productivity is examined using a tropical cyclone version of the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS®). A four-component Nutrient-Phytoplankton-Detritus biological model is integrated into COAMPS to create a fully integrated air-ocean-wave-biology model. This study investigates the upper ocean physical and biological states before and after Hurricane Ivan traversed the central Gulf of Mexico, in mid-September 2004. Elevated concentrations of surface chlorophyll-a appear in the simulation two days after the passage of the tropical cyclone, and these results are spatially and temporally coherent with Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data for this time period. Model results …

Reduced Caco 3 Flux To The Seafloor And Weaker Bottom Current Speeds Curtail Benthic Caco 3 Dissolution Over The 21st Century, Olivier Sulpis, Carolina O. Dufour, David S. Trossman, Andrea J. Fassbender, Brian K. Arbic, Bernard P. Boudreau, John P. Dunne, Alfonso Mucci

Faculty Publications

No abstract provided.

Biogeochemical Response Of Apalachicola Bay And The Shelf Waters To Hurricane Michael Using Ocean Color Semi-Analytic/Inversion And Hydrodynamic Models, Eurico J. D’Sa, Ishan D. Joshi, Bingqing Liu, Dong S. Ko, Christopher L. Osburn, Thomas S. Bianchi

Faculty Publications

Hurricanes are increasingly being recognized as important episodic drivers in ocean biogeochemical cycling; however, spatiotemporal response of their impacts on coastal and estuarine ecosystems are limited. Hurricane Michael, which made landfall just west of Apalachicola Bay (ApB) on October 10, 2018 as a Category 5 hurricane with sustained winds of 250 km h⁻¹, caused widespread damage to the northwest Florida coast, and adverse effects on oyster reefs and water quality in ApB due to winds and coastal flooding associated with a strong storm surge. The impact of wind forcing and retreating storm surges on coastal and shelf biogeochemical …

Multi-Pattern Data Mining And Recognition Of Primary Electric Appliances From Single Non-Intrusive Load Monitoring Data, Shengli Du, Mingchao Li, Shuai Han, Jonathan Shi, Heng Li

Faculty Publications

The electric power industry is an essential part of the energy industry as it strengthens the monitoring and control management of household electricity for the construction of an economic power system. In this paper, a non-intrusive affinity propagation (AP) clustering algorithm is improved according to the factor graph model and the belief propagation theory. The energy data of non-intrusive monitoring consists of the actual energy consumption data of each electronic appliance. The experimental results show that this improved algorithm identifies the basic and combined class of home appliances. According to the possibility of conversion between different classes, the combination of …

Gumbo Yearbook, Class Of 2019, Louisiana State University And Agricultural And Mechanical College

Gumbo Yearbook

The Gumbo yearbook chronicles the entire academic year at LSU. In words and especially photos, the Gumbo shows the people, places, and events that make each year unique. In addition to formal portraits of schools and departments, the book contains hundreds of snapshots of students with their friends and dozens of pages showcasing organizations.

Review Of Sharks In The Time Of Saviors, Michael F. Russo

Faculty Publications

No abstract provided.

Review Of Days By Moonlight, Michael F. Russo

Faculty Publications

No abstract provided.

A 1-Dimensional Sympagic-Pelagic-Benthic Transport Model (Spbm): Coupled Simulation Of Ice, Water Column, And Sediment Biogeochemistry, Suitable For Arctic Applications, Shamil Yakubov, Philip Wallhead, Elizaveta Protsenko, Evgeniy Yakushev, Svetlana Pakhomova, Holger Brix

Faculty Publications

© 2019 by the authors. Marine biogeochemical processes can strongly interact with processes occurring in adjacent ice and sediments. This is especially likely in areas with shallow water and frequent ice cover, both of which are common in the Arctic. Modeling tools are therefore required to simulate coupled biogeochemical systems in ice, water, and sediment domains. We developed a 1D sympagic-pelagic-benthic transport model (SPBM) which uses input from physical model simulations to describe hydrodynamics and ice growth and modules from the Framework for Aquatic Biogeochemical Models (FABM) to construct a user-defined biogeochemical model. SPBM coupled with a biogeochemical model simulates …

Two Isomers Of [1-Benzyl-4-(Pyridin-2-Yl-Jn)-1h-1,2,3-Triazole-Jn3]Dichloridobis(Dimethyl Sulfoxide-Js)Ruthenium(Ii), Fatemeh Khamespanah, Andrew W. Maverick

Faculty Publications

© 2019 International Union of Crystallography. All rights reserved. The structures of two isomers of the title compound, [RuCl2(C14H12N4)-(C2H6OS)2], 2 and 3, are reported. Isomers 2 and 3 are produced by reaction of the pyridyltriazole ligand 1-benzyl-4-(pyridin-2-yl)-1H-1,2,3-triazole (bpt) (1) with fac-[RuCl2(DMSO-S)3(DMSO-O)]. Reaction in acetone produces ca 95% 2, which is the OC-6-14 isomer, with cis DMSO and trans chlorido ligands, and 5% 3 (the OC-6-32 isomer, with cis DMSO and cis chlorido ligands, and the pyridyl moiety of bpt trans to DMSO). Reaction in refluxing toluene initially forms 2, which slowly isomerizes to 3.

Overexpressing The H-Protein Of The Glycine Cleavage System Increases Biomass Yield In Glasshouse And Field-Grown Transgenic Tobacco Plants, Patricia E. López-Calcagno, Stuart Fisk, Kenny L. Brown, Simon E. Bull, Paul F. South, Christine A. Raines

Faculty Publications

© 2018 The Authors. Plant Biotechnology Journal published by Society for Experimental Biology and The Association of Applied Biologists and John Wiley & Sons Ltd. Photorespiration is essential for C3 plants, enabling oxygenic photosynthesis through the scavenging of 2-phosphoglycolate. Previous studies have demonstrated that overexpression of the L- and H-proteins of the photorespiratory glycine cleavage system results in an increase in photosynthesis and growth in Arabidopsis thaliana. Here, we present evidence that under controlled environment conditions an increase in biomass is evident in tobacco plants overexpressing the H-protein. Importantly, the work in this paper provides a clear demonstration of the …

A Comprehensive Evaluation Of Predictive Performance Of 33 Species Distribution Models At Species And Community Levels, Anna Norberg, Nerea Abrego, F. Guillaume Blanchet, Frederick R. Adler, Barbara J. Anderson, Jani Anttila, Miguel B. Araújo, Tad Dallas, David Dunson, Jane Elith, Scott D. Foster, Richard Fox, Janet Franklin, William Godsoe, Antoine Guisan, Bob O'Hara, Nicole A. Hill, Robert D. Holt, Francis K.C. Hui, Magne Husby, John Atle Kålås, Aleksi Lehikoinen, Miska Luoto, Heidi K. Mod, Graeme Newell, Ian Renner, Tomas Roslin, Janne Soininen, Wilfried Thuiller, Jarno Vanhatalo, David Warton, Matt White, Niklaus E. Zimmermann

Faculty Publications

© 2019 The Authors. Ecological Monographs published by Wiley Periodicals, Inc. on behalf of Ecological Society of America A large array of species distribution model (SDM) approaches has been developed for explaining and predicting the occurrences of individual species or species assemblages. Given the wealth of existing models, it is unclear which models perform best for interpolation or extrapolation of existing data sets, particularly when one is concerned with species assemblages. We compared the predictive performance of 33 variants of 15 widely applied and recently emerged SDMs in the context of multispecies data, including both joint SDMs that model multiple …

Engines Of Rebellion: Confederate Ironclads And Steam Engineering In The American Civil War, Trevor Cox

Civil War Book Review

In Engines of Rebellion Saxton T. Bisbee surveys the history of Southern steam machinery across those ironclads laid down by the Confederate Navy Department during the Civil War. The book is comprehensive in describing the mechanical composition of 23 completed and 4 nearly-completed rebel warships (this out of about 50 armoured vessels that the Richmond government are known to have commissioned between 1861 and 1865). Bisbee hereby brings to bear his considerable experience in marine heritage and archaeology, being an alumni of East Carolina University’s maritime research programs, and a manager and nautical archaeologist at Northwest Seaport Maritime Heritage Center …

Fighting Means Killing: Civil War Soldiers And The Nature Of Combat, Sam D. Elliott

Civil War Book Review

“War means fighting, and fighting means killing.” Famed Confederate cavalryman Nathan Bedford Forrest’s well-known and brutally concise statement of the essence of war serves to set the theme of Jonathan M. Steplyk’s study of the nature of killing in Civil War combat. Utilizing wartime and postwar accounts of participants, a number of which are quite familiar to Civil War readers, Steplyk analyzes this peculiar and ultimate experience of war from the point of view of the men who were necessarily tasked with killing their erstwhile countrymen.

A Campaign Of Giants: The Battle For Petersburg: Volume One, From The Crossing Of The James To The Crater, Benjamin F. Cooling

Civil War Book Review

The conclusion of the Centenary of World War I may be the appropriate moment to re-visit America’s forerunner to modern siege warfare, the ten-month Richmond-Petersburg campaign which all but concluded the agonizingly long struggle in the eastern theater. Just as the Western Front in France eventually cracked, opening the way to the Armistice, so too did Robert E. Lee’s determined stand for the Confederate capital, thus leading to the Appomattox solution. In a comprehensive, labor of love based on encyclopedic knowledge of men and events, long-time Petersburg authority A. Wilson Greene prepares a three-volume treatise, the first of which covers …

Becoming Lincoln, Daniel W. Crofts

Civil War Book Review

Politics “always came first” for Abraham Lincoln, writes William W. Freehling (128). The future “Great Emancipator” hesitated, however, to make America’s original sin part of his political agenda. Only after “twenty years of antislavery silence” did he start to find a new voice (100).

Freehling insists that Lincoln, all along, was driven “to save the Founders’ flawed republic” (106). He wanted to resuscitate the spirit of the Declaration of Independence and give all men “an unfettered start, and a fair chance” (307). But his sensitive political antenna constrained him. Most Illinois whites were unmoved by the wrongs inflicted on Southern …

Prison Pens: Gender, Memory, And Imprisonment In The Writings Of Mollie Scollay And Wash Nelson, 1863-1866, Angela Zombek

Civil War Book Review

Tim Williams (University of Oregon) and Evan Kutzler (Georgia Southwestern University) have presented a truly remarkable two-way correspondence between Confederate prisoner of war Wash (George Washington) Nelson, Jr. and his fiancée, Mollie Scollay. The couple’s story reflects a people caught in the crosshairs of war. Williams’s expertise in intellectual and gender history, and Kutler’s expertise in Civil War prisons combine to contextualize and interpret Wash’s experience of captivity, through both his letters to Mollie and his post-war memoirs, and Mollie’s experiences on the home front, which included her perception of Wash’s imprisonment.