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Articles 1 - 5 of 5
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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 …
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 …
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 …
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 …