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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
This study is focused on the application of 222Rn (radon, t1/2=3.8 d) as a geochemical tracer for evaluation groundwater fluxes in different aquatic systems including submarine springs and lakes. For this purpose improvements of some...
Lake Jackson in Leon County Florida is a shallow perched dissolution lake, which sits above the Cody Scarp and is formed from the coalescence of sinkholes. Lake Jackson currently has two open sinkholes, Porter Sink and Lime Sink....
The objective of this research was to investigate the bioavailability of various Hg(II) species in laboratory and natural solutions using a bioluminescent bacterial biosensor. The Hg(II) bacterial biosensor is a genetically engineered E....
Northern high-latitude freshwater systems are an essential link between terrestrial and marine carbon cycles, transporting organic matter from ecosystems on land to the Arctic Ocean. However, polar regions are warming faster than the...
Globally, karst ecosystems are experiencing anthropogenic impacts due to their high hydrologic connectivity, leading to issues including increasing color (browning) as noted in recent decades at the largest freshwater spring on Earth ...
The environmental impacts of COVID-19 and the “new normal” of working from home are being explored in the scientific community. However, there is currently no published study on the COVID-19 impacts to nitrate load via septic systems....
Groundwater-surface water interactions in lakes have been gaining attention in recent years as scientists have recognized the potential significance that groundwater has as a source of nutrients and contaminants to aquatic ecosystems....
Many states within the U.S., including Florida, have seen steady population growth since the 1950s. While population growth can lead to economic growth, excessive growth of urban areas can lead to negative externalities such as road...
Environmental legislation is a relatively new concept in the United States’ regulatory regime. High profile environmental disasters, including several in other countries, have underscored the challenges of effectively and efficiently...
Natural disasters such as hurricanes have been affecting thousands of people annually with devastating consequences such as loss of life, vegetation and infrastructure. Vegetation losses such as coastal erosion, downed trees and...
The Arctic is warming at a rate twice that of other global ecosystems and changing climate conditions in the Arctic are mobilizing long frozen permafrost stores of organic carbon. In regions of extensive ground ice, thawing permafrost...
The Gulf of Mexico is a hydrocarbon-rich region characterized by the presence of floating oil slicks from persistent natural hydrocarbon seeps, which are reliably captured by synthetic aperture radar (SAR) satellite imaging. Improving...
This study focused on the combined use of radon and radium isotopes as tracers of near-shore geophysical processes including submarine groundwater discharge (SGD), water exchange rates, and atmospheric evasion. Methods were developed for...
Climate change is radically altering the Arctic. These alterations are expected to have immense and cascading implications on the carbon cycling of the region. In particular, our interest lies in the Kolyma River (KR) as it is the...
Naturally-occurring radioisotopes are ubiquitous in nature, and as such, there are many opportunities for researchers to use them as environmental tracers. Their associated radioactive decay rates provide an inherent time clock that...
The purpose of this thesis was to develop the Gas Push-Pull Test (GPPT) for landfill cover soil applications to measure H2S oxidation. This thesis begins with an overview of solid waste management in the USA, and describes the...
Sympatric species may overlap in their use of spatial and trophic resources, which can increase the risk of competition. Comparing the ecological niches and quantifying the degree of niche overlap among these species can provide insights...
Characterizations of habitat use and ecological connectivity are essential components of a complete ecological understanding of any organism. Habitat use may be broadly defined as the behaviors that an animal exhibits in any scenopoetic...
Organic geochemical proxies (OGPs: δ13C, δ15N and C/N) preserved in coastal lake sediments appear to be more sensitive indicators of past storm events than traditional proxies used in paleotempestology. However, the method has not been...
Foraging Ecology and Diet Selection of Juvenile Green Turtles (Chelonia mydas) in the Western Bahamas: Insights from Stable Isotope Analysis and Prey Mapping
Species’ foraging choices influences their somatic growth rates, age at maturity, and time spent in vulnerable early life stages. Thus, differences in population demographics are often attributed to variability either in diet type, ...
In the uppermost millimeters of shallow submerged coastal sediments, photosynthesis by microalgae and cyanobacteria during daylight hours can cause oxygen supersaturation of sediment porewater, leading to bubble formation. In shallow...
Rivers deliver approximately 260 Tg of dissolved organic carbon (DOC) to the ocean annually, yet there is little evidence of terrigenous DOC (tDOC) in the ocean. While tDOC was historically believed to be stable and resistant to...
Elasmobranch fishes are a highly vagile group that often cross state, regional or international boundaries. Delineating migratory patterns that cross jurisdictional boundaries is essential for effective management, especially when...
Hardbottom habitats in the Big Bend Region of the Gulf of Mexico are the foundation for structure-forming species, such as corals and sponges. These structure forming communities (SFC) provide important ecological services; they serve as...
Inland aquatic systems such as lakes, rivers, and wetlands are pivotal in cycling carbon between the landscape and the atmosphere. However, as global air temperatures increase and precipitation patterns continue to change, their roles as...
Climate change is melting glaciers and altering watershed biogeochemistry across the globe, particularly in regions dominated by mountain glaciers, such as southeast Alaska. Glacier dominated watersheds exhibit distinct dissolved organic...
Climate change is dramatically altering the global carbon cycle. The warming caused by climate change is approximately twice the global average in Arctic and contiguous northern high-latitude regions, which are thus especially...
Climate change is decreasing watershed glacial coverage throughout Alaska, impacting the biogeochemistry of downstream ecosystems. We collected streamwater fortnightly over the glacial runoff period from three streams of varying...
Leaking sewer pipes can be a significant source of contaminants to soil, groundwater, and connected surface water bodies, because untreated wastewater contains nutrients, biologic pathogens, and toxic chemicals. Numerical modeling...
Submarine groundwater discharge (SGD) assessments conducted both in the laboratory and at a field site in the northeastern Gulf of Mexico, using a continuous-heat type automated seepage meter (seepmeter) have shown that the device has...
LLocal climate influences sea turtle hatching and emergence success with climatic extremes affecting embryonic development and hatchling emergence. Thus, it is crucial to understand how different climatic variables affect hatchling...
Since the discovery of the Gulf of Mexico, it has become an area of extensive exploration. The Gulf of Mexico harbors specific commodities that are essential in our modern economy. Oil companies provided money and technology to find and...
Hydrologic studies of lakes tend to not include groundwater inputs as they are seen as a negligible amount to the water budget. However, there are certain environments such as Geographically Isolated Wetlands (GIW) in which groundwater...
Sandy beach ecosystems are important for many species for foraging, resting, and reproduction. Marine turtles are one species that use beaches for reproduction. Coastal areas are also attractive to humans as centers of commerce and...
Mountain glaciers export ancient, energy-rich, and highly bioavailable dissolved organic matter (DOM) to freshwater and marine ecosystems, influencing downstream carbon cycling and supporting food webs. Despite its importance and the...
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
