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Articles 121 - 150 of 381
Full-Text Articles in Biology
Advanced Castes At The Outset Of Eusociality In Wasps (Vespidae), Patrick Piekarski
Advanced Castes At The Outset Of Eusociality In Wasps (Vespidae), Patrick Piekarski
Electronic Theses and Dissertations
A dominating and widespread view is that evolutionary change is gradual and waits upon mutation. Likewise, it is thought that workers and queens of eusocial insects diverged gradually and stepwise. That is, rudimentary castes preceded advanced castes. This paradigm hinges on eusociality having evolved once in Vespidae, and primitively eusocial paper wasps lacking ontogenetic caste biasing (differentiation of castes during larval development). Using a phylogenomic approach this study shows strong evidence for two origins of eusociality in vespid wasps, wherein one origin is likely characterized by the sudden appearance of castes with physiological, and perhaps even morphological, differences established before …
Go With The Flow: Patterns Of Connectivity In Low Dispersal Coral Reef Gobies (Coryphopterus Spp.) Throughout The Western Atlantic, Daniel Volk
Electronic Theses and Dissertations
Gene flow is an integral biological process that can mediate speciation. While many consider the ocean to be an open environment, there are many barriers that limit gene flow, particularly in the western Atlantic. I analyzed data from two widespread, coral reef fishes, the bridled goby (Coryphopterus glaucofraenum) and sand-canyon goby (C. venezuelae), throughout their range in the western Atlantic. Using two genetic datasets, mitochondrial DNA (mtDNA) and genomic SNPs, I investigated the evolutionary history of these species and inferred the location and strength of putative barriers. My results suggest that several unique lineages have genetically diverged from one another …
The Paths Less Traveled: Movement Of Gopher Tortoises Along Roads And Railways, Rhett Rautsaw
The Paths Less Traveled: Movement Of Gopher Tortoises Along Roads And Railways, Rhett Rautsaw
Electronic Theses and Dissertations
Urbanization and an expanding human population have led to a large degree of habitat destruction and fragmentation. These, in turn, reduce biodiversity and wildlife population sizes on a global scale. Transportation infrastructure, such as roads and railways, are some of the largest contributors to habitat fragmentation. Roads are well-established to negatively impact wildlife, but some studies suggest a potential use in habitat connectivity by functioning as wildlife corridors to connect distant populations. Railways are similarly known to impact wildlife by increasing mortality rates as well as provide unique risks such as electrocution and entrapment when compared to roads. However, the …
Climate Change And The Evolution Of Insect Immune Function, Danae Perry
Climate Change And The Evolution Of Insect Immune Function, Danae Perry
Electronic Theses and Dissertations
Insects are ectothermic organisms that have physiological, behavioral and life-history traits directly influenced by their environment. Investigations have shown that many insects use melanin to permanently darken their cuticles in cooler or drier climates to improve thermoregulation and desiccation resistance. Melanin is a major component of pathogen defense in insects. This suggests that environmentally driven adaptive changes in cuticular melanin may non-adaptively shape insect immune function. This hypothesis has been referred to as climate-related Cuticle Dependent Immune Investment (climate-related CDII). Climate-related CDII also suggests that a warming climate could lead to the evolution of a weakened melanin-based immune response due …
The Behavior Of Humans And Wildlife With Respect To Roads: Insights For Mitigation And Management, Molly Grace
The Behavior Of Humans And Wildlife With Respect To Roads: Insights For Mitigation And Management, Molly Grace
Electronic Theses and Dissertations
Road ecology is the study of how roads and wildlife interact. Traditionally, road ecologists have primarily focused on one effect of roads: roadkill. Though roadkill can have devastating effects on wildlife populations, roads have sub-lethal impacts that are gaining more and more attention from the scientific community. These sub-lethal impacts include noise, light, and chemical pollution as well as altered habitat structure, which can all influence animal behavior. In this dissertation, I applied a behavioral ecology framework to study specific lethal and sub-lethal road effects with the goal of improving mitigation efforts. In Chapters 1 and 2, I evaluated how …
Using Biomarkers To Assess The Migratory Ecology And Reproduction Of The Florida Green Turtle (Chelonia Mydas), Ryan Chabot
Using Biomarkers To Assess The Migratory Ecology And Reproduction Of The Florida Green Turtle (Chelonia Mydas), Ryan Chabot
Electronic Theses and Dissertations
Migratory connectivity between breeding and foraging areas is a vital component of the ecology of a diverse collection of marine vertebrates. Habitat quality, composition, and resource availability at these locations have direct ramifications for individual fitness. The green turtle (Chelonia mydas) is a long-lived, highly migratory species of conservation concern. Important green turtle nesting habitat in Florida is protected, but more information is needed to identify foraging habitats and the influence these habitats have on reproduction. Here, I used stable isotope analysis of δ13C, δ15N, and δ34S and satellite telemetry validation to determine the number of putative foraging areas used …
Cross-Continental Insights Into Jaguar (Panthera Onca) Ecology And Conservation, Joe Figel
Cross-Continental Insights Into Jaguar (Panthera Onca) Ecology And Conservation, Joe Figel
Electronic Theses and Dissertations
The jaguar (Panthera onca) is a widely distributed large carnivore and the focal species of a range-wide connectivity initiative known as the jaguar conservation network (JCN). Comprised of ~83 Jaguar Conservation Units (JCUs) and ~75 corridors from northern Mexico to Argentina, the JCN functions as a conduit for jaguar movement and gene flow. Key linkages in the network are imperiled by human population growth, large-scale agriculture, highway expansion, and other infrastructural development. Labeled "corridors of concern," these vulnerable linkages are imperative to the maintenance of connectivity and genetic diversity throughout jaguar distribution. I take a multi-faceted approach to analyze conservation …
Using Molecular Genetic And Demographic Tools To Improve Management Of Ex Situ Avian Populations, Gina Ferrie
Using Molecular Genetic And Demographic Tools To Improve Management Of Ex Situ Avian Populations, Gina Ferrie
Electronic Theses and Dissertations
Small populations, specifically those that are isolated from others, are more prone to extinction than larger inter-connected populations. The risks that these small isolated populations face include loss of genetic diversity due to founder effects and inbreeding due to population bottlenecks, as well as demographic uncertainty due to fluctuating fecundity and mortality rates and impacts of external environmental factors. Ex situ populations, including those managed as conservation breeding programs with species recovery aims, as well as those that do not have reintroduction goals but are managed for long term population sustainability, suffer from the same extinction risks as small and …
Reproductive Life History And Signal Evolution In A Multi-Species Assemblage Of Electric Fish, Joseph Waddell
Reproductive Life History And Signal Evolution In A Multi-Species Assemblage Of Electric Fish, Joseph Waddell
Electronic Theses and Dissertations
Animals that co-occur in sympatry with multiple closely-related species use reproductive mate attraction signals not only to assess the quality of a potential conspecific mate (sexual selection), but also to discriminate conspecifics from heterospecifics (species recognition). However, the extent to which sexual selection and species recognition may interact, or even conflict, is poorly known. Neotropical electric fish offer unrivaled opportunities for understanding this problem. They generate simple, stereotyped mate attraction signals that are easy to record and quantify, and that are well-understood from the neurobiological perspective. Additionally, they live in electrically-crowded environments, where multiple congeners live and reproduce in close …
A Chemical And Genetic Approach To Study The Polyamine Transport System In Drosophila, Minpei Wang
A Chemical And Genetic Approach To Study The Polyamine Transport System In Drosophila, Minpei Wang
Electronic Theses and Dissertations
Polyamines are small cationic molecules that play important roles in most vital cellular processes including cell growth and proliferation, regulation of chromatin structure, translation and programmed cell death. Cellular polyamine pools are maintained by a balance between biosynthesis and transport (export and import). Increased polyamine biosynthesis activity and an active transport system are characteristics of many cancer cell lines, and polyamine depletion has been shown to be a viable anticancer strategy. Polyamine levels can be depleted by α-difluoromethylornithine (DFMO), an inhibitor of the key polyamine biosynthesis enzyme ornithine decarboxylase. However, malignant cells often circumvent DFMO therapy by up-regulating polyamine import; …
The Subject Librarian Newsletter, Biology, Fall 2016, Sandy Avila
The Subject Librarian Newsletter, Biology, Fall 2016, Sandy Avila
Libraries' Newsletters
No abstract provided.
The Subject Librarian Newsletter, Biology, Spring 2016, Patti Mccall
The Subject Librarian Newsletter, Biology, Spring 2016, Patti Mccall
Libraries' Newsletters
No abstract provided.
The Effect Of Climate On Physiology And Immune Function In The Asian Citrus Psyllid, Diaphorina Citri, Grace Avecilla
The Effect Of Climate On Physiology And Immune Function In The Asian Citrus Psyllid, Diaphorina Citri, Grace Avecilla
Honors Undergraduate Theses
The variation in the insect immune system is an important regulator of insect populations and the pathogens they carry. A central component of insect immunity is melanin, whose production creates cytotoxic intermediates that help to protect against a broad spectrum of pathogens. Melanin is also used in insect cuticle where it helps to improve thermoregulation and desiccation resistance, with insects having less melanized cuticles in warmer and more humid environments. Considering that cuticle melanin and immune melanin are formed by near identical biochemical pathways, they are pleiotropically linked (that is, one or more linked genes influence multiple traits). This has …
Assessment Of Staphylococcus Aureus Genetics: Clinical Versus Community Epidemiology, Matthew Lawrance
Assessment Of Staphylococcus Aureus Genetics: Clinical Versus Community Epidemiology, Matthew Lawrance
Electronic Theses and Dissertations
Staphylococcus aureus has an historical relationship with anthropogenic environments, particularly hospitals, where infection characteristics differ from community-acquired disease. This has promoted a designation of strains as healthcare or community associated. Despite this affiliation, genetic approaches have failed to support these groupings. In order to establish the genetic relationship between S. aureus from differing anthropogenic environments, I have analyzed the relatedness between three cohorts of S. aureus: nasal carriage isolates from community participants, infectious isolates from hospitals, and a cohort from an uninvestigated environment, an ambulatory clinic. Multilocus Sequence Typing (MLST) and Staphylococcus aureus protein a (spa) repeat regions were analyzed …
Effects Of Harmful Algal Blooms Caused By Aureoumbra Lagunensis (Brown Tide) On Larval And Juvenile Life Stages Of The Eastern Oyster (Crassostrea Virginica), Panagiota Makris
Effects Of Harmful Algal Blooms Caused By Aureoumbra Lagunensis (Brown Tide) On Larval And Juvenile Life Stages Of The Eastern Oyster (Crassostrea Virginica), Panagiota Makris
Electronic Theses and Dissertations
Harmful algal blooms caused by the marine microalga Aureoumbra lagunensis have been associated with negative impacts on marine fauna, both vertebrate and invertebrate. Within the Indian River Lagoon (IRL) estuary system along Florida's east coast, blooms of A. lagunensis in excess of 1×106 cells mL-1 have occurred along with higher than average salinities (> 35 PSU) during times of peak reproduction and growth for the eastern oyster Crassostrea virginica. Field and laboratory studies were used to investigate the effects of A. lagunensis and high salinities on early life stages of eastern oysters, late pediveliger to early juvenile. Natural recruitment of …
Involvement Of Mirnas In The Development Of Androgen Independent Prostate Cancer, Richard Ottman
Involvement Of Mirnas In The Development Of Androgen Independent Prostate Cancer, Richard Ottman
Electronic Theses and Dissertations
Development of resistance to androgen deprivation therapy (ADT) is a major obstacle for the management of advanced prostate cancer. Therapies with androgen receptor (AR) antagonists and androgen withdrawal initially result in tumor regression but development of compensatory mechanisms including AR bypass signaling leads to tumor re-growth, independent of circulating androgens. The result is the emergence of castration resistant prostate cancer (CRPC), a highly morbid disease exhibiting aberrant expression of many protein-coding and non-coding genes. Under the umbrella of non-coding RNAs is a class of small regulatory RNAs referred to as microRNAs (miRNAs). MicroRNAs are believed to function in the maintenance …
Pasture Management, The Red Imported Fire Ant (Solenopsis Invicta) And Dung Beetle Mediated Ecosystem Services, Christen Steele
Pasture Management, The Red Imported Fire Ant (Solenopsis Invicta) And Dung Beetle Mediated Ecosystem Services, Christen Steele
Electronic Theses and Dissertations
Grazing animals in Florida deposit over 20 million metric tons of dung per year, making dung a significant non-point source of pollution (extrapolated from Fincher, 1981). Degradation of this dung occurs naturally, primarily due to a diverse group of beetles (Order Coleoptera) primarily in the families Scarabaeidae and Geotrupidae(hereafter dung beetles). Dung that is not degraded becomes a non-point source of pollutants and may be leached into water bodies. Additionally, dung provides an incubation site for the pests and parasites of both humans and livestock. Thus, as dung beetles consume and degrade dung, they provide a multitude of ecosystem services …
Habitat Distribution And Abundance Of Crayfishes In Two Florida Spring-Fed Rivers, Tiffani Manteuffel
Habitat Distribution And Abundance Of Crayfishes In Two Florida Spring-Fed Rivers, Tiffani Manteuffel
Electronic Theses and Dissertations
Crayfish are an economically and ecologically important invertebrate, however, research on crayfish in native habitats is patchy at best, including in Florida, even though the Southeastern U.S. is one of the most speciose areas globally. This study investigated patterns of abundance and habitat distribution of two crayfishes (Procambarus paeninsulanus and P. fallax) in two Florida spring-fed rivers (Wakulla River and Silver River, respectively). Study sites were surveyed once each season from April 2015 to March 2016 with baited minnow traps checked every other day, four times each survey. Habitat and environmental parameters evaluated included dominant vegetation or bottom type, percent …
From Pet To Pest? The Potential Global Range And Food Web Effects Of A Generalist Carnivore, Hannah Bevan
From Pet To Pest? The Potential Global Range And Food Web Effects Of A Generalist Carnivore, Hannah Bevan
Electronic Theses and Dissertations
The Nile monitor lizard [Varanus niloticus (Linnaeus, 1766)] is a generalist carnivore, native to Sub-Saharan Africa and the Nile River but now established in North America as a result of the pet trade. Once introduced, they are a potential invasive threat to native wildlife. Here, I create ensemble species distribution models (SDMs) to predict the global distribution of this generalist carnivore given current and future climate conditions. I then quantify the monitor's potential effects on 85 food webs representing >900 different species within the projected regions based on stomach content data. Climate, vegetation, and elevation data are used for 507 …
Role Of Kruppel-Like Factor 8 (Klf8) In Cancer And Cardiomyopathy, Satadru Lahiri
Role Of Kruppel-Like Factor 8 (Klf8) In Cancer And Cardiomyopathy, Satadru Lahiri
Electronic Theses and Dissertations
Cancer and cardiovascular diseases are two most fatal diseases causing innumerable death each year. Understanding the mechanisms underlying these diseases is critical for developing proper therapeutic approach. Kruppel-like factor 8 (KLF8) is a member of Kruppel-like family transcription factors that is overexpressed in many types of cancers. There is no report on role of KLF8 in cardiovascular diseases to date. KLF8 transcriptionally activates or represses a host of target genes to promote cancer cell proliferation, migration, invasion and epithelial to mesenchymal transition during tumor progression. Studies proposed in this thesis identified a novel posttranslational modification of KLF8 essential for its …
Transforming The Aquatic Urban Landscape: Nutrient Status And Management Of Stormwater Basins, Lindsay Skovira
Transforming The Aquatic Urban Landscape: Nutrient Status And Management Of Stormwater Basins, Lindsay Skovira
Electronic Theses and Dissertations
Urbanization is a largely irreversible anthropogenic change that degrades environmental quality, including aquatic ecosystems. Stormwater ponds are a popular best management practice (BMP) to mitigate the effects of urban land use on downstream water bodies and contribute significantly to the total area of aquatic ecosystems in some urban watersheds. My research investigated the distribution of stormwater ponds and examined how different urban land uses influenced biophysicochemical conditions and management of those ponds in a rapidly developing suburban watershed in the Econlockhatchee River basin in Florida, USA. I evaluated limnological and ecological parameters in randomly-selected ponds distributed among three urban land-use …
Pyroglutamylated Amyloid Beta Peptides Enhance Non-Fibrillogenic Aggregation Of The Unmodified Peptide, Gregory Goldblatt
Pyroglutamylated Amyloid Beta Peptides Enhance Non-Fibrillogenic Aggregation Of The Unmodified Peptide, Gregory Goldblatt
Electronic Theses and Dissertations
Alzheimer's disease (AD) is accompanied by abnormal extracellular deposition of amyloid b (Ab) peptide. This has led to the amyloid cascade hypothesis, causatively relating Ab with AD. While Ab deposits assume a fibrillar cross-b structure, prefibrillar oligomers of Ab have been identified as the main cytotoxic agents in AD. Pyroglutamylated amyloid beta (AbpE) peptides are N-terminally truncated and pyroglutamylated (at Glu3 or Glu11) Ab molecules that display enhanced cytotoxicity and represent up to 50% of total Ab in AD brains. AbpE significantly enhances the toxicity of unmodified Ab by an unknown mechanism. Although in situ Ab populations are heterogeneous, the …
Flying Under The Lidar: Relating Forest Structure To Bat Community Diversity, Anna Schneider Swanson
Flying Under The Lidar: Relating Forest Structure To Bat Community Diversity, Anna Schneider Swanson
Electronic Theses and Dissertations
Bats are important to many ecological processes such as pollination, insect (and by proxy, disease) control, and seed dispersal and can be used to monitor ecosystem health. However, they are facing unprecedented extinction risks from habitat degradation as well as pressures from pathogens (e.g., white-nose syndrome) and wind turbines. LiDAR allows ecologists to measure structural variables of forested landscapes with increased precision and accuracy at broader spatial scales than previously possible. This study used airborne LiDAR to classify forest habitat/canopy structure at the Ordway-Swisher Biological Station (OSBS) in north central Florida. LiDAR data were acquired by the National Ecological Observatory …
Genetic Structure And Demographic Analysis Of Key Deer (Odocoileus Virginianus Clavium), Vicki Villanova
Genetic Structure And Demographic Analysis Of Key Deer (Odocoileus Virginianus Clavium), Vicki Villanova
Electronic Theses and Dissertations
Recent improvements in genetic analyses have paved the way in using molecular data to answer questions regarding evolutionary history, genetic structure, and demography. Key deer are a federally endangered subspecies assumed to be genetically unique (based on one allozyme study), homogeneous, and have a female-biased population of approximately 900 deer. I used 985bp of the mitochondrial cytochrome b gene and 12 microsatellite loci to test two hypotheses: 1) if the Moser Channel is a barrier to gene flow, I should expect that Key deer are differentiated and have reduced diversity compared to mainland deer and (2) if isolation on islands …
A Binary Approach For Selective Recognition Of Nucleic Acids And Proteins, Evan Cornett
A Binary Approach For Selective Recognition Of Nucleic Acids And Proteins, Evan Cornett
Electronic Theses and Dissertations
The design of probes for the selective recognition of biopolymers (nucleic acids and proteins) is a fundamental task for studying, diagnosing, and treating diseases. Traditional methods utilize a single component (small molecule or oligonucleotide) that binds directly to the target biopolymer. However, many biopolymers are unable to be targeted with this approach. The overarching goal of this dissertation is to explore a new, binary approach for designing probes. The binary approach requires two components that cooperatively bind to the target, triggering a recognition event. The requisite binding of two-components allows the probes to have excellent selectivity and modularity. The binary …
A High-Content Multiplexed Screening Platform For The Evaluation And Manipulation Of Force And Fatigue Of Adult Derived Skeletal Muscle Myotubes In Defined Serum-Free Medium, Christopher Mcaleer
A High-Content Multiplexed Screening Platform For The Evaluation And Manipulation Of Force And Fatigue Of Adult Derived Skeletal Muscle Myotubes In Defined Serum-Free Medium, Christopher Mcaleer
Electronic Theses and Dissertations
The overall focus of this project has two parts: First, was to develop a protocol utilizing serum-free media formulations and defined plating and culture techniques to create functional in vitro myotubes derived from adult skeletal muscle satellite cells. The second was to manipulate the inherent muscle parameters such as force output and fatigue of these myotubes by employing exercise regimes or by small molecule application. The importance of serum-free medium use for in vitro cultures is becoming increasingly important in creating functional systems that can be validated for drug testing by the Food and Drug Administration (FDA). Also, the study …
The Effect Of Landscape Variables On Adult Mosquito (Diptera:Culicidae)Diversity And Behavior, Caitlyn Debevec
The Effect Of Landscape Variables On Adult Mosquito (Diptera:Culicidae)Diversity And Behavior, Caitlyn Debevec
Electronic Theses and Dissertations
Diseases vectored by mosquitoes cause millions of deaths each year. In modern times Florida*s disease risk has been reduced due to efforts to lessen the prevalence of mosquitoes through habitat modification of non-adults. With emerging diseases (i.e. Dengue and Chikunguya) encroaching into Florida from the Caribbean, this traditional approach may not be enough. Alternatively, we can better understand the ecology of how disease works in an ecosystem. One possible way is through the Dilution Effect, which states that the more species that are in a system the lower the chance for zoonosis. This project models mosquito diversity across regions, land …
Quantifying The Effects Of Boat Wakes On Intertidal Oyster Reefs In A Shallow Estuary, Donna Campbell
Quantifying The Effects Of Boat Wakes On Intertidal Oyster Reefs In A Shallow Estuary, Donna Campbell
Electronic Theses and Dissertations
There have long been concerns about the negative impacts of recreational boating activity in the Indian River Lagoon system (IRL), especially in Mosquito Lagoon (ML), the northernmost part of the IRL. My research is focused on the impacts of boat wakes on intertidal reefs formed by the eastern oyster, Crassostrea virginica. There has been a 24% loss of oyster habitat in ML since 1943, where natural oyster reefs have been replaced by dead oyster reefs which do not serve the same ecological function. While there is anecdotal and correlative evidence that this loss is a result of boat wakes, no …
Modeling And Analysis Of A Three-Species Food Web With Facilitated And Intraguild Predation, Joshua Castro
Modeling And Analysis Of A Three-Species Food Web With Facilitated And Intraguild Predation, Joshua Castro
Electronic Theses and Dissertations
Biotic interactions are known to shape natural community assemblages and biodiversity. Positive interactions such as facilitation have recently received attention in ecological food webs. Mechanistic models have improved our understanding of these complex food web interactions. Here, focus is given to a three-species food web system with a beach dune natural community in mind. In the last decade, there has been a series of studies investigating intraguild predation between two major loggerhead sea turtle nest predators, North American raccoons and Atlantic ghost crabs. Studies have also highlighted that ghost crab predation assists raccoons in finding nests (i.e., facilitated predation). However, …
The Subject Librarian Newsletter, Biology, Fall 2015, Patti Mccall
The Subject Librarian Newsletter, Biology, Fall 2015, Patti Mccall
Libraries' Newsletters
No abstract provided.