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Articles 1 - 9 of 9
Full-Text Articles in Entire DC Network
Isolation And Characterization Of Acidobacterium Ailaaui Sp. Nov., A Novel Member Of Acidobacteria Subdivision 1, From A Geothermally Heated Hawaiian Microbial Mat, Marisa R. Myers, G. M. King
Isolation And Characterization Of Acidobacterium Ailaaui Sp. Nov., A Novel Member Of Acidobacteria Subdivision 1, From A Geothermally Heated Hawaiian Microbial Mat, Marisa R. Myers, G. M. King
Faculty Publications
© 2016 IUMS. A novel member of Acidobacteria was isolated from a microbial mat growing on a geothermally heated dead tree trunk in Hawai'i Volcanoes National Park (HI, USA). The rod-shaped, Gramnegative capsulated cells of strain PMMR2T were non-motile and catalase and oxidase negative. Growth occurred aerobically from 15 to 55 °C (optimum, 40 °C) and at pH values from 4.5 to 7.0 (optimum, 6.5). A limited range of sugars and organic acids supported growth. However, results of a genomic analysis suggested that various polysaccharides might be hydrolysed as carbon sources, and evidence for pectin degradation was observed in liquid …
Association Between 25-Hydroxyvitamin D And Intact Parathyroid Hormone Levels Across Latitude Among Adults With African Ancestry, Holly Kramer, Pauline Camacho, John Aloia, Amy Luke, Pascal Bovet, Jacob Plange Rhule, Terrence Forrester, Vickie Lambert, Regina Harders, Lara Dugas, Richard Cooper, Ramon Durazo-Arvizu
Association Between 25-Hydroxyvitamin D And Intact Parathyroid Hormone Levels Across Latitude Among Adults With African Ancestry, Holly Kramer, Pauline Camacho, John Aloia, Amy Luke, Pascal Bovet, Jacob Plange Rhule, Terrence Forrester, Vickie Lambert, Regina Harders, Lara Dugas, Richard Cooper, Ramon Durazo-Arvizu
Faculty Publications
Objective: To compare levels of 25-hydroxyvitamin D (25OHD) associated with a plateauing of intact parathyroid (iPTH) across latitudes among adults with African ancestry. Methods: This study included approximately 500 adults of African ancestry ages 25 to 45 years living in 4 sites: Chicago, Illinois (41°N), Jamaica (17°N), Ghana (6°N), and South Africa (34°S). Multivariate linear regression models, a nonlinear logistic growth curve model, and piecewise linear models with a single knot were fitted to estimate the 25OHD level associated with a plateauing of iPTH with adjustment for covariates. Goodness of fit was compared using computer intensive permutation tests. Results: Mean …
Variable Prey Development Time Suppresses Predator-Prey Cycles And Enhances Stability, James T. Cronin, John D. Reeve, Dashun Xu, Mingqing Xiao, Heidi N. Stevens
Variable Prey Development Time Suppresses Predator-Prey Cycles And Enhances Stability, James T. Cronin, John D. Reeve, Dashun Xu, Mingqing Xiao, Heidi N. Stevens
Faculty Publications
© 2016 John Wiley & Sons Ltd/CNRS. Although theoretical models have demonstrated that predator-prey population dynamics can depend critically on age (stage) structure and the duration and variability in development times of different life stages, experimental support for this theory is non-existent. We conducted an experiment with a host-parasitoid system to test the prediction that increased variability in the development time of the vulnerable host stage can promote interaction stability. Host-parasitoid microcosms were subjected to two treatments: Normal and High variance in the duration of the vulnerable host stage. In control and Normal-variance microcosms, hosts and parasitoids exhibited distinct population …
Competition-Mediated Feedbacks In Experimental Multispecies Epizootics, Tad Dallas, Richard J. Hall, John M. Drake
Competition-Mediated Feedbacks In Experimental Multispecies Epizootics, Tad Dallas, Richard J. Hall, John M. Drake
Faculty Publications
© 2016 by the Ecological Society of America. Competition structures ecological communities and alters host-pathogen interactions. In environmentally transmitted pathogens, an infection-resistant competitor may influence infection dynamics in a susceptible species through the negative impacts of competition (e.g., by reducing host density or causing nutritional stress that increases susceptibility to infection) and/or the positive impacts of reducing transmission efficiency (e.g., by removing environmental pathogen stages). Thus, a non-susceptible competitor may enhance, reduce, or have no net effect on susceptible host density and infection prevalence. Here, we couple an epidemiological model with experimental epidemics to test how resource competition with a …
Influence Of The Mississippi River On Pseudo-Nitzschia Spp. Abundance And Toxicity In Louisiana Coastal Waters, Sibel Bargu, Melissa M. Baustian, Nancy N. Rabalais, Ross Del Rio, Benjamin Von Korff, R. Eugene Turner
Influence Of The Mississippi River On Pseudo-Nitzschia Spp. Abundance And Toxicity In Louisiana Coastal Waters, Sibel Bargu, Melissa M. Baustian, Nancy N. Rabalais, Ross Del Rio, Benjamin Von Korff, R. Eugene Turner
Faculty Publications
The presence of domoic acid (DA) toxin from multiple species of Pseudo-nitzschia is a concern in the highly productive food webs of the northern 1,* 2,3 2 1 1,4 1 1 2 3 4 Gulf of Mexico. We documented the Pseudo-nitzschia presence, abundance, blooms, and toxicity over 3 years along a transect ∼100 km west of the Mississippi River Delta on the continental shelf. Pseudo-nitzschia were present throughout the year and occurred in high abundances (>10 cells l ) in the early spring months during high Mississippi River (MSR) flow (∼20,000 m s ) but were most abundant ( …
Constrained Total Energy Expenditure And Metabolic Adaptation To Physical Activity In Adult Humans, Herman Pontzer, Ramon Durazo-Arvizu, Lara R. Dugas, Jacob Plange-Rhule, Pascal Bovet, Terrence E. Forrester, Estelle V. Lambert, Richard S. Cooper, Dale A. Schoeller, Amy Luke
Constrained Total Energy Expenditure And Metabolic Adaptation To Physical Activity In Adult Humans, Herman Pontzer, Ramon Durazo-Arvizu, Lara R. Dugas, Jacob Plange-Rhule, Pascal Bovet, Terrence E. Forrester, Estelle V. Lambert, Richard S. Cooper, Dale A. Schoeller, Amy Luke
Faculty Publications
Current obesity prevention strategies recommend increasing daily physical activity, assuming that increased activity will lead to corresponding increases in total energy expenditure and prevent or reverse energy imbalance and weight gain [1-3]. Such Additive total energy expenditure models are supported by exercise intervention and accelerometry studies reporting positive correlations between physical activity and total energy expenditure [4] but are challenged by ecological studies in humans and other species showing that more active populations do not have higher total energy expenditure [5-8]. Here we tested a Constrained total energy expenditure model, in which total energy expenditure increases with physical activity at …
Coloration In The Polymorphic Frog Oophaga Pumilio Associates With Level Of Aggressiveness In Intraspecific And Interspecific Behavioral Interactions, Sandra P. Galeano, Kyle E. Harms
Coloration In The Polymorphic Frog Oophaga Pumilio Associates With Level Of Aggressiveness In Intraspecific And Interspecific Behavioral Interactions, Sandra P. Galeano, Kyle E. Harms
Faculty Publications
© 2015, Springer-Verlag Berlin Heidelberg. Intraspecific morphological variation may correspond to behavioral variation that helps determine the nature of species interactions. Color variation among populations of variably toxic organisms has been shown to associate with alternative anti-predator behaviors. However, the effects of these alternative behavioral tendencies on the outcomes of interspecific interactions other than predator–prey remain largely unexplored. We investigated how coloration and body size variation in Oophaga pumilio, one of the most phenotypically diverse amphibians known, associated with territorial aggressiveness and how this association influenced the outcome of agonistic male–male interactions with conspecifics and heterospecifics of two sympatric species …
Ant Diversity And Community Structure In Coastal Dunes And Wetlands, Xuan Chen
Ant Diversity And Community Structure In Coastal Dunes And Wetlands, Xuan Chen
LSU Doctoral Dissertations
How do many species live in a certain place? How does species composition changes among habitats? And what mechanisms decide species distribution? These are fundamental questions in community ecology. I first investigated ant diversity in two coastal ecosystems (dunes and wetlands) in the northern Gulf of Mexico, and then used the distribution patterns to infer assembly processes that structure ant communities in coastal areas. Specifically, the following hypotheses are tested: (1) coastal systems support lower ant diversity due to the unsuitable environment; (2) species living near the seashore are a subset of those exist near inland; (3) deterministic processes are …
Evaluating Survival Of Released Ranched American Alligator In Coastal Louisiana, Kristy Durham Capelle
Evaluating Survival Of Released Ranched American Alligator In Coastal Louisiana, Kristy Durham Capelle
LSU Master's Theses
Since 1986, Louisiana’s American alligator (Alligator mississippiensis) ranching program has required the release of alligators produced from eggs collected from wild nests to maintain wild populations. This project assessed long-term harvest data (1991-2010s) to estimate survival of released alligators. First, wildlife and fishery harvest models and general inter-disciplinary survival models were evaluated to determine best fit to the data. Second, once the best fitting model was selected, release length, precipitation and temperature from release sites, and an index of hunter effort were added to investigate influences on survival estimates. Release length was included because over time the proportion and size …