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Browsing Theses and Dissertations - Department of Biological Sciences by Subject "Biogeochemistry"

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Cyclic occurrence of fire and its role in carbon dynamics along an edaphic moisture gradient in longleaf pine ecosystems

Whelan, Andrew Walter (University of Alabama Libraries, 2012)

Fire regulates the structure and function of savanna ecosystems, yet we lack understanding of how cyclic fire affects savanna productivity and carbon dynamics. Furthermore, it is largely unknown how predicted changes in ...
Examination of relationships between bacterial communities, urease activity, and environmental variables over space and time in Gulf of Mexico wetlands

Lee, Philip Oscar (University of Alabama Libraries, 2017)

Urea is an organic form of nitrogen that has seen enormous commercial growth as agricultural fertilizer. With this expansion, ecosystems such as wetlands are more likely to experience elevated concentrations of urea via ...
Fungal succession and carbon quality as drivers of nitrogen removal capacity in a constructed salt marsh

Starr, Sommer Faith (University of Alabama Libraries, 2020)

Coastal wetlands mitigate excess nutrient inputs by acting as important sites of denitrification. Despite their role in removing excess nitrogen, coastal wetland area has declined by more than 50% in the 20th century, ...
Influence of native freshwater mussel functional traits and community structure on nitrogen removal in stream sediments

Nickerson, Zachary Lynn (University of Alabama Libraries, 2018)

Animals physically and chemically modify their environment as a result of their functional traits. These effects are particularly influential in freshwater benthic environments where animal aggregations can impact the ...
Interactions of hydrology and water chemistry in two coastal plain streams in a forested watershed

Sims, Susan Ashley (University of Alabama Libraries, 2010)

The goal of this study was to compare and contrast the annual seasonal changes in hydrology and water chemistry of Mayfield Creek and Talladega Branch, two low-order streams located within the same forested watershed. ...
Nitrogen cycling in the Gulf of Mexico estuaries: how do nitrate reduction pathways differ between river-dominated and groundwater-dominated estuaries?

Bernard, Rebecca Jane (University of Alabama Libraries, 2014)

Sediment nitrogen (N) cycling was investigated through multi-year field and laboratory experiments in river- and groundwater-dominated northern Gulf of Mexico estuaries. In order to determine the dominant N reduction ...
Presence of vegetation and tidal heights influence rates of denitrification in a natural and restored marsh in the northern Gulf of Mexico

Kleinhuizen, Alice (University of Alabama Libraries, 2015)

Salt marshes act as coastal filters, permanently removing nitrate through denitrification. This study determined denitrification rates in a typical northern Gulf of Mexico (GOM) salt marsh and the factors that influenced ...
Spatial and temporal variability in methane and carbon dioxide exchange at three coastal marshes along a salinity gradient in a northern Gulf of Mexico estuary

Wilson, Benjamin (University of Alabama Libraries, 2013)

Carbon fluxes in tidal marshes vary spatially and temporally because of vegetation cover, subsurface biogeochemical processes, and environmental forcing. The objective of this study was to examine how ecosystem carbon ...
Spatio-temporal variation and dissolved organic carbon processing of streambed microbial community: stable carbon isotope approach

Akinwole, Philips Olugbemiga (University of Alabama Libraries, 2013)

Sedimentary microbial communities play a critical ecological role in lotic ecosystems and are responsible for numerous biogeochemical transformations, including dissolved organic matter (DOM) uptake, degradation, and ...
The contribution of benthic nutrient fluxes to water column primary production in Weeks Bay, Alabama

Riggs, Ashley Arielle (University of Alabama Libraries, 2010)

In shallow estuaries benthic and pelagic processes are tightly coupled such that the nutrients fueling primary production are regenerated from the sediments by the decomposition of organic matter. Weeks Bay, Alabama, a ...
The effect of Hurricane Michael on the structure and function of longleaf pine woodlands

Kenney, Gavin Ross (University of Alabama Libraries, 2021)

Hurricanes are increasing in intensity due to climate change and can physically alter ecosystems, causing immediate and potentially long-lasting effects on carbon dynamics. On October 10, 2018, Hurricane Michael hit the ...
The impact of nutrient loading on nitrogen removal and carbon dynamics in a juncus roemerianus and spartina alterniflora dominated salt marsh in the northern Gulf of Mexico

Ledford, Taylor (University of Alabama Libraries, 2019)

Increased anthropogenic nutrient loading of nitrogen (N) and phosphorus (P) to estuaries and bays can lead to eutrophication, anoxia or hypoxia, and/or loss of native or other important species. Coastal salt marshes help ...
The role of geomorphology in river biogeochemical processing

Chapman, Elise LeNoir (University of Alabama Libraries, 2014)

Although once treated as simple downstream transporters of material, river networks are now recognized for their role in processing, or transformation, storage, and removal, of carbon and nutrients during transport. The ...
The role of larval anurans as consumers in ecosystem processes within geographically isolated wetlands in the Southeastern United States

McLeay, Scott (University of Alabama Libraries, 2017)

The role of consumers in aquatic ecosystems has gained substantial recognition due to their potential contributions to ecosystem processes such as decomposition, primary production, and nutrient availability. Our understanding ...

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Browsing Theses and Dissertations - Department of Biological Sciences by Subject "Biogeochemistry"

Browsing Theses and Dissertations - Department of Biological Sciences by Subject "Biogeochemistry"

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