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Articles 1 - 9 of 9
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Changes In Ant Biodiversity Across An Urban Gradient, Hao Brooks
Changes In Ant Biodiversity Across An Urban Gradient, Hao Brooks
Honors Theses
There are two aims to this study: compare diversity across an urban gradient and across seasons. We deployed traps and identified the collected 12 ant species at nine different sites centered at Chattanooga, Tennessee, for the purpose of relating levels of urbanization to the diversity of ant species at each site. We successfully sampled in the summer (June 27, 2017) and spring (March 31, 2018), and unsuccessfully sampled in winter (Feb. 16, 2018) when we collected zero ants, likely due to cold soil temperatures. To quantify “urbanization” we divided the sites into “Urban” core verses surrounding “Suburban” area using a …
Determining Methods Of Propagation For The Investigation Of Intraspecific Variability Of Climate Change Responses Of Appalachian Plant Species, Gayle L. Tyree
Determining Methods Of Propagation For The Investigation Of Intraspecific Variability Of Climate Change Responses Of Appalachian Plant Species, Gayle L. Tyree
Honors Theses
Species range migrations are a well-documented response to climate change (Loarie et al. 2009), with range shifts mainly occurring poleward or to higher elevations (Walther et al. 2002). As range shifts occur, variation in phenotypic traits within plant species across climate gradients could affect their abilities to acclimate or adapt to a changing climate (Hooper et al. 2005, Souza et al. 2011). In 2014 Dr. Jennifer Boyd (BGES) initiated a research project to examine potential intraspecific phenotypic variation within wide-ranging Appalachian plant species of responses to projected future atmospheric CO2 and temperature regimes. As an undergraduate research assistant, I focused …
Understanding Polycyclic Aromatic Hydrocarbon Degradation By Soil Microbial Communites: The Concentration And Distribution Of Aromatic Dioxygenase Genes, Inigo Walker Howlett
Understanding Polycyclic Aromatic Hydrocarbon Degradation By Soil Microbial Communites: The Concentration And Distribution Of Aromatic Dioxygenase Genes, Inigo Walker Howlett
Masters Theses and Doctoral Dissertations
The ability to individually identify and enumerate bacterial genes in the environment is an important development in the field of microbial ecology. Researchers are now able to quantify and map populations and communities, the presence of which could only be inferred until recently. Knowledge of this ecology is critical to understanding microbial responses to environmental pollutants, thereby contributing information useful in devising and monitoring bioremediation strategies. The following thesis therefore compares two aromatic dioxygenase genes, nidA and nahAc, which confer the ability for the bacteria carrying the genes to metabolize polycyclic aromatic hydrocarbons (PAHs), persistent pollutant byproducts of coal coking. …
Herbarium Infrastructure Development And Ecological Applications Of Specimens Using Geographic Information Systems, Ryan Joseph Miller
Herbarium Infrastructure Development And Ecological Applications Of Specimens Using Geographic Information Systems, Ryan Joseph Miller
Masters Theses and Doctoral Dissertations
Geographic Information Systems (GIS) allow for herbarium data to be used for new scientific research and also for the greater efficiency of the traditional uses of herbaria. My research uses the resources of both the herbarium at the University of Tennessee at Chattanooga (UCHT) and partnering herbaria of the Southeastern Regional Network of Expertise and Collections (SERNEC) to examine methods of incorporating new GIS technology into a functional infrastructure in order to enhance botanical research. Evaluations were performed on database and georeferencing software for use in the development of a pilot, GIS-enabled website used to query herbaria specimen information. Using …
Ecotoxicology And Environmental Education In The Development Of A Turtle Conservation Program In Southeastern Tennessee, Stefan L. Moss
Ecotoxicology And Environmental Education In The Development Of A Turtle Conservation Program In Southeastern Tennessee, Stefan L. Moss
Masters Theses and Doctoral Dissertations
In 1999, the Tennessee Aquarium initiated a long-term mark-recapture study to promote the conservation of freshwater turtles in the Tennessee River Gorge (TRG). The TRG consists of a 42-kilometer stretch of the Tennessee River surrounded by 27,000 acres (11,000 hectares) and is known as the "Grand Canyon of Tennessee." In 2002, the Aquarium established a partnership with The University of Tennessee at Chattanooga (UTC) and the Tennessee River Gorge Trust (TRGT) to expand the program. Since then, researchers at UTC have been conducting scientific research at the TRG each year in an effort to increase the amount of available information …
Conservation Of Castanea Dentata Genetic Resources Of The Southeastern United States, Mark Thomas Alexander
Conservation Of Castanea Dentata Genetic Resources Of The Southeastern United States, Mark Thomas Alexander
Masters Theses and Doctoral Dissertations
The ongoing effort by the American Chestnut Foundation to breed and reintroduce a blight resistant, locally adapted variety of American chestnut (Castanea dentata) requires a broad genetic base. To ensure adequate genetic diversity, genetic resources must be collected from throughout the native range of the species. Finding and breeding surviving C. dentata stump sprouts is problematic due to the relatively short life span of blooming stems and their often remote forest habitat. To facilitate more efficient location of surviving trees in the southeastern U.S., we used a Geographic Information System (GIS) to overlay soil, topography, and satellite imagery for the …
Effect Of Riparian Land Use On The Biotic Integrity Of Fish Assemblages In Black Creek, Chattanooga, Tennessee, Jerri Leigh Phillips
Effect Of Riparian Land Use On The Biotic Integrity Of Fish Assemblages In Black Creek, Chattanooga, Tennessee, Jerri Leigh Phillips
Masters Theses and Doctoral Dissertations
Black Creek is a third-order Ridge and Valley stream (Tennessee River drainage) in Chattanooga, Tennessee. Most ofBlack Creek's watershed is forested (ca. 71% in 1991 ). However, increasing urban development, particularly along the riparian landscapes, could impact the stream's ecological health. I assessed fish assemblages (biotic integrity), water quality, instream habitat, and riparian land-use features at eight sites in Black Creek, May-June 2000. Water quality conditions (temperature, dissolved oxygen, pH, conductivity) were favorable for stream fishes, but some level of habitat degradation (bank erosion, sedimentation, loss of riparian vegetation) was observed at all sites. Electrofishing samples yielded a total of29 …
Evaluation Of Sampling Methodologies For Assessing Fish Species Richness In Ridge And Valley Streams In Chattanooga, Tennessee, Evan Robertson Crews
Evaluation Of Sampling Methodologies For Assessing Fish Species Richness In Ridge And Valley Streams In Chattanooga, Tennessee, Evan Robertson Crews
Masters Theses and Doctoral Dissertations
I evaluated the adequacy of different electrofishing approaches for estimating species richness in small Ridge and Valley streams. My study objectives were to determine the effects of the sampling season, reach length, habitat sequences surveyed, and sampling intensity on estimates of fish species richness. Fish assemblages were sampled at 18 sites across five streams in the Chattanooga, Tennessee area, May-June (spring) and July-August (summer) 1998. Reach lengths ranged from 103 to 278 m (30 to 61 times the mean stream width [MSW]). At each site, fish were collected using one or two backpack electrofishers within habitat-specific enclosures (riflle-run or pool). …
Effects Of Watershed Land Use On The Benthic Macroinvertebrate Assemblages In Ridge And Valley Streams In Chattanooga, Tennessee, Paul Leiper Freeman
Effects Of Watershed Land Use On The Benthic Macroinvertebrate Assemblages In Ridge And Valley Streams In Chattanooga, Tennessee, Paul Leiper Freeman
Masters Theses and Doctoral Dissertations
A total of 20 sites in five Ridge and Valley streams located in Chattanooga, Tennessee were sampled May 8, 1998 to June 18, 1998 using quantitative and qualitative macroinvertebrate sampling techniques. All streams sampled were part of the Tennessee River drainage system and eventually contribute to Nickajack Reservoir. The 20 sites were second to fourth order streams with drainage areas of 3.8 to 46.9 (km2) and elevations of 195 to 232 (m). Sites with different percentages of agricultural, urbanized and forested land-use were selected to best evaluate the resulting impacts of urbanization and other anthropogenic activities on the invertebrate community …