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Dendrochronological Analysis Of Productivity And Hydrology In Two Louisiana Swamps, John Blake Amos
Dendrochronological Analysis Of Productivity And Hydrology In Two Louisiana Swamps, John Blake Amos
LSU Master's Theses
Modified river flows and land subsidence have subjected many coastal swamp forests in the delta of the Mississippi River to greatly altered flooding, sediment, and nutrient regimes. These areas have become inundated to greater depth, duration, and frequency and either are connected to the river and receive drastically increased sediment and nutrients (riverine swamps) or have become disconnected from riverine flooding (stagnant swamps) and receive little or no sediment and nutrient input. To better understand how these changes are affecting ecosystems, dendrochronological techniques for baldcypress (Taxodium distichum L. Rich.) were used at three sites in each of two contrasting swamps …
Freshwater Mussel Communities Of The Florida Parishes, Louisiana: The Importance Of Spatial Scale, Anne Raynie Bambarger
Freshwater Mussel Communities Of The Florida Parishes, Louisiana: The Importance Of Spatial Scale, Anne Raynie Bambarger
LSU Master's Theses
The Southeastern United States has the most diverse and imperiled freshwater mussel (Unionidae) fauna in the world. The community structure and decline of these organisms is the result of complex interactions between biotic and abiotic factors, but the limited spatial scale of most community studies has failed to elucidate the underlying mechanisms shaping community structure. Basing community assessments solely on microhabitat variables alone has lead to stark contradictions in management recommendations and opposing definitions of habitat requirements for these organisms. However, with the introduction of GIS technology into aquatic management, it is now feasible to include variables from larger spatial …
Uncovering Bacterial Diversity On And Below The Surface Of A Hyper-Arid Environment, The Atacama Desert, Chile, Danielle Rene Bagaley
Uncovering Bacterial Diversity On And Below The Surface Of A Hyper-Arid Environment, The Atacama Desert, Chile, Danielle Rene Bagaley
LSU Master's Theses
The Atacama Desert in Chile extends from latitudes 17º S to 28º S between longitudes 69º W and 71º W. It has been reported that surface soils in the hyper-arid region contain low numbers of culturable heterotrophic bacteria. These soils are considered Mars-like and offer an ideal setting to investigate the application of life detection systems. Thirty-three surface sites were sampled to examine further the extent of the hyper-arid region. We also excavated four soil pits, 40 cm to 90 cm in depth, to explore subsurface microbial communities. One pit was dug in a southern region of the desert compared …