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Browsing Theses and Dissertations - Department of Biological Sciences by Title

Now showing items 82-101 of 109

Regulation of sexual dimorphism in the drosophila melanogaster abdomen

Yan, Shun (University of Alabama Libraries, 2015)

Sexual dimorphism throughout the animal kingdom is important for proper behavior and reproduction within species. A deeply conserved family of transcription factors called DMRTs control many aspects of sex-specific development ...
Resolving generic boundaries in rhytidophyllum and gesneria: a molecular phylogeny of the Caribbean subtribe Gesneriinae (gesneriaceae)

Watson, David Reece (University of Alabama Libraries, 2015)

Abstract The Caribbean subtribe Geseneriinae is comprised of 4 genera consisting of approximately 91 species. Most species are in Gesneria and Rhytidophyllum and fewer than five are currently recognized in Bellonia and ...
River ecosystems in a changing Arctic: using retrospective and experimental approaches to understanding future change

Kendrick, Michael R. (University of Alabama Libraries, 2016)

Accelerated rates of warming in arctic environments are expected to have substantial effects on arctic river ecosystems. This dissertation uses observational and experimental approaches to understand potential responses ...
Seasonal changes in wetland plant chemical composition and effects on local environment

Vincent, Catherine Allisa (University of Alabama Libraries, 2012)

Wetlands are productive ecosystems known as areas of biogeochemical diversity. This diversity comes from nutrient transformations and gas fluxes that are caused by adjoining aerobic and anaerobic environments. Nitrogen is ...
Shaping the range: disentangling the effects of geography, ecology, history, genetics, and life history on the wood frog’s distribution

Duncan, Sarah Isabelle (University of Alabama Libraries, 2016)

Exploring the factors that structure and limit species' ranges are of central importance to ecology, biogeography, and evolutionary biology because these factors are tied directly to understanding the distribution and ...
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 ...
Speciation, hybridization, lineage persistence, and conservation of North American musk turtles: (genus sternotherus)

Scott, Peter Alexander (University of Alabama Libraries, 2016)

Species are the most fundamental units of biodiversity, and importantly the only unit of biodiversity that can be explicitly evolutionarily defined. Thus, understanding biodiversity on all levels (e.g. ecosystem, community, ...
Spring-adapted darters (Percidae: Etheostoma) as a model to understand factors that influence diversification, gene flow, and genetic variation in freshwater fishes

Fluker, Brook Lee (University of Alabama Libraries, 2011)

Darters (Percidae: Etheostomatinae) represent one of the most successful evolutionary radiations in North America and have become an exceptional model system in the study of freshwater fish diversification. I used a variety ...
Survey of drinking water quality and health in Alabama's Black Belt

Wedgworth, Jessica (University of Alabama Libraries, 2014)

Worldwide, approximately 768 million people drink unsafe water, which is potentially contaminated by the 2.5 billion people without sanitation facilities. The need for basic services such as safe drinking water and effective ...
A Systematic Revision of the Genus Heteranthera (sensu lato; Pontederiaceae)

Horn, Charles Norman (University of Alabama Libraries, 1985)

The genus Heteranthera Ruiz and Pavon (sensu lato) contains species which grow submersed or emersed in streams and marshes. Species of the genus are found mainly in tropical and subtropical areas of the New World and Africa. ...
Systematics and biogeography of the neotropical genus paradrymonia and close allies

Mora Pinto, Martha Marcela (University of Alabama Libraries, 2014)

It is widely known that loss of biological diversity at different levels, such as genetic lineages, species, populations, communities and natural habitats, is imminent in many areas on Earth. That loss is exacerbated by ...
Systematics of the neotropical genus drymonia (gesneriaceae)

Clavijo, Laura (University of Alabama Libraries, 2016)

Understanding the patterns and processes that have shaped the current distribution of biodiversity in the Neotropics is a major focus in biological research. Robust phylogenetic hypotheses are fundamental to infer these ...
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 development and regulation of adult abdominal segment reduction in drosophila

Wang, Wei (University of Alabama Libraries, 2014)

A central aim of evolutionary research is to understand the genetic and molecular mechanisms underlying the morphological divergence of species. A growing body of evidence has been accumulated showing mutations in ...
The effects of N and P supply on invertebrate foodwebs: an experimental test of ecological stoichiometry in detritus-based ecosystems

Demi, Lee Michael (University of Alabama Libraries, 2016)

In the last several decades, ecological stoichiometry has emerged as a promising framework for predicting how shifts in the relative availability of N and P influence biological processes from cellular to ecosystem scales. ...
The evolution of jumping performance and associated morphology in an amphibious fish: an ontogenetic perspective

Styga, Joseph Michael (University of Alabama Libraries, 2018)

Animals depend on numerous fitness-related performance characteristics for survival, and reproduction. Variation in these performance characteristics is often a consequence of selection on morphological variation. However, ...
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 influence of changing environmental conditions on biological contributions to elevation in brackish marshes threatened by sea-level rise

Jones, Joshua (University of Alabama Libraries, 2015)

Coastal wetlands provide human populations with a multitude of ecosystem services, but they are increasingly threatened by sea-level rise and other simultaneously changing environmental conditions. To avoid drowning as ...
The influence of energy availability on population-, community-, and ecosystem-level processes in cave stream ecosystems

Venarsky, Michael (University of Alabama Libraries, 2012)

Detritus from surface environments supplies the energy that shapes community structure and fuels productivity in most cave ecosystems. However, only qualitative descriptions of cave energy dynamics are available, hindering ...

Now showing items 82-101 of 109

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Browsing Theses and Dissertations - Department of Biological Sciences by Title

Browsing Theses and Dissertations - Department of Biological Sciences by Title

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