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Articles 1 - 10 of 10
Full-Text Articles in Entire DC Network
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 …
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 …
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 …
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 …
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 …
Supercritical Fluid Extraction And Analysis Of Plant Oils, Tianchuan Du
Supercritical Fluid Extraction And Analysis Of Plant Oils, Tianchuan Du
LSU Master's Theses
Supercritical fluid extraction (SFE) of oxeye daisy (Chrysanthemum leucanthemum L.) seed, heartwood of Port-Orford cedar (POC) (Chamaecyparis lawsoniana), Alaska yellow cedar (AYC) (Chamaecyparis nootkatensis), and Eastern red cedar (ERC) (Juniperus virginiana L), and Chinese tallow (Sapium sebiferum L. Roxb. ) seed was investigated in this study and compared with other extraction methods. For the oxeye daisy seed extraction, Soxhlet extraction (SE) with hexane, microwave assisted extraction (MAE), and supercritical fluid extraction (SFE) were conducted. The results showed that as the extraction temperature decreased from 100 °C, the extraction rate increased until 30 °C using SFE. With an increase of extraction …
Response Of Selected Warm-Season Turfgrasses And Ornamental Monocots To Short-Term, High Concentration, Ozone Fumigation, Lou Ann Mcknight
Response Of Selected Warm-Season Turfgrasses And Ornamental Monocots To Short-Term, High Concentration, Ozone Fumigation, Lou Ann Mcknight
LSU Doctoral Dissertations
Ozone (O3), one of the most powerful oxidants known, is phytotoxic at high levels in the troposphere, or ground-level. Effects of acute ozone exposure for two consecutive days was examined on Bermudagrass (Cynodon dactylon), centipedegrass (Eremochloa ophiuroides), zoysiagrass (Zoysia japonica), St. Augustinegrass (Stenotaphrum secundatum), Liriope muscari ‘Big Blue’, Liriope muscari ‘Aztec’, and Ophiopogon japonicus. Zoysiagrass, St. Augustinegrass, Liriope muscari ‘Big Blue’ were used in the second study based on the differential responses found in the study. Ozone induced severe visual damage to St. Augustinegrass with symptoms appearing as chlorotic streaks. St. Augustinegrass and Liriope muscari had a significant reduction in …