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Articles 3271 - 3290 of 3290
Full-Text Articles in Entire DC Network
Using Lidar To Approximate Keystone Structure And Evaluate Management Practices In Potential Habitats Of The Endangered Karner Blue Butterfly (Lycaeides Melissa Samuelis), Brandyn Balch
Graduate Theses, Dissertations, and Problem Reports
Keystone structure is the spatial structure required by a given species, at a scale that is determined by that species’ needs and mobility. The endangered Karner blue butterfly (Lycaeides melissa samuelis, hereafter KBB) has a keystone structure that incorporates trees and bushes to provide the mixture of sun and shade required to fulfil its life functions. Airborne light detection and ranging (lidar) is a potentially invaluable tool for characterizing keystone structures. However, lidar has yet to be utilized to evaluate structural suitability of KBB habitats. Therefore, I investigated the use of lidar for characterizing critical attributes of KBB habitat structure, …
Inferring Food Web Structure To Identify Seasonal And Longitudinal Patterns In Ogeechee River Invertebrate Communities, Julien Marc Buchbinder
Inferring Food Web Structure To Identify Seasonal And Longitudinal Patterns In Ogeechee River Invertebrate Communities, Julien Marc Buchbinder
Electronic Theses and Dissertations
Understanding how the structure and function of aquatic communities vary across space and time is essential for proper management of freshwater ecosystems. Current management relies on rapid biomonitoring using metrics of community structure, but metrics that incorporate ecosystem processes and functions are only just beginning to see use in assessment and management. Food webs inferred from known species interactions have been proposed as a method of incorporating function into bioassessment without expending extra effort or sacrificing the cost-effectiveness of current monitoring schemes. To apply food webs in biomonitoring, it is first necessary to understand how communities and food webs vary …
Impact Of Seasonal And Host-Related Factors On The Intestinal Microbiome And Cestode Community Of Sorex Cinereus And Sorex Monticola, Katelyn D. Cranmer
Impact Of Seasonal And Host-Related Factors On The Intestinal Microbiome And Cestode Community Of Sorex Cinereus And Sorex Monticola, Katelyn D. Cranmer
Electronic Theses and Dissertations
The intestinal microbiome of mammals plays a significant role in host health and response to environmental stimuli and can include both beneficial native bacteria as well as parasitic worms. In this study, I examined the intestinal cestode and bacterial communities of two closely related species of shrew, Sorex monticola and Sorex cinereus, over a six month period in 2016. Specimens were collected approximately every three weeks from May to October from the Sangre de Cristo Mountains in Cowles, New Mexico. A total of 79 shrews were prepared with the gastrointestinal tracts removed and flash-frozen in liquid nitrogen. An additional …
Wetland Biogeochemical Responses To Predicted Climate Change Scenarios, Angela R. Shaffer
Wetland Biogeochemical Responses To Predicted Climate Change Scenarios, Angela R. Shaffer
Electronic Theses and Dissertations
Wetlands are one of the world's largest known carbon sinks while comprising only a small amount of the Earth's surface. However, the amount of carbon sequestered by wetlands is shrinking as droughts and human disturbance increases. Carbon in wetlands is stored through the contrast of decomposition and sedimentation of organic matter and absorption of CO2 from the atmosphere by soil microbes. Understanding how changing hydrological regimes and increased wildfires will affect wetland soil and microbial processes is important in the face of predicted climate change for future wetland conservation practices. Specifically, I seek to understand the response of southeastern …
Investigating The Role Of Coyotes, Canis Latrans, In The Spread Of Parasites And Arthropod-Borne Diseases In Georgia, Usa., Ansleigh Banks
Investigating The Role Of Coyotes, Canis Latrans, In The Spread Of Parasites And Arthropod-Borne Diseases In Georgia, Usa., Ansleigh Banks
Electronic Theses and Dissertations
In order to analyze the role of coyotes, Canis latrans, as hosts of parasites and arthropod-borne diseases in the state of Georgia, USA, 38 coyotes representing 18 counties and multiple geographic regions of the state were dissected and analyzed for the presence of Dirofilaria immitis, intestinal parasites, ectoparasites, and tick-borne illnesses. Mosquitoes from the locations which the coyotes originated were trapped and analyzed for the presence of D. immitis larvae. In compliance with IACUC guidelines, coyotes were obtained from individuals who had previously hunted or trapped the coyotes for leisure. Parasites were identified based on morphological features with the use …
The Effect Of Mild Cognitive Impairment On Anxiety In Older Adults In American And Ukraine, Eleanor Ryan
The Effect Of Mild Cognitive Impairment On Anxiety In Older Adults In American And Ukraine, Eleanor Ryan
Senior Honors Theses and Projects
With the growing population of elderly individuals throughout the world, the study of their emotional distress is ever poignant to society. This is especially true when these individuals have cognitive impairment. The research, in regards to Eastern European individuals, is lacking. To gain a better understanding of this understudied population, elderly people with Mild Cognitive impairment (MCI) from both Ukraine and the United States were studied. It was found that the anxiety rates of the Ukrainian MCI group were significantly higher than both the United States MCI group and the Ukraine control (p = 0.004). Purpose The purpose of this …
Utilization Of Homoplasy-Free Sine Markers To Resolve The Phylogeny Of Peromyscus Species, Alec Wroblewski
Utilization Of Homoplasy-Free Sine Markers To Resolve The Phylogeny Of Peromyscus Species, Alec Wroblewski
Senior Honors Theses and Projects
The Peromyscus genus consists of over 50 recognized species, providing a rare opportunity to study evolutionary mechanisms of mammalian speciation, which is enhanced by phylogenetic analyses. We propose utilizing short interspersed DNA elements (SINEs) to assess the evolutionary history of Peromyscus as these markers provide a "molecular fossil record" since shared genomic integrations of elements correspond to descent from common ancestors. We have identified "young" SINEs from sequences of P. aztecus to advance our study by assessing for the presence of elements at fourteen orthologous loci among twelve species, including three separate P. aztecus individuals, one of which was used …
Characterization Of Reproductive Tumors In Caenorhabditis Elegans, Shanti Nicole Gunda Bernstein
Characterization Of Reproductive Tumors In Caenorhabditis Elegans, Shanti Nicole Gunda Bernstein
Senior Honors Theses and Projects
Tumors are characterized by over-proliferation of cells. However, not all tumors behave the same or have the same effects on surrounding non-tumorous tissues. Using the model organism C. elegans, we established tumor rupture trends in tumorous animals of three different genotypes. The characteristics studied include the effect of a germline tumor on the distribution of intermediate filament proteins in the endotube of the intestine, rate of tumor rupture between the hermaphrodites of each genotype, and tumor nuclear morphology of males and hermaphrodites of two genotypes. We conclude that tumors in C. elegans behave differently among the genotypes studied and the …
Examination Of Behavioral Lateralizations In Juvenile Tarantulas In The Presence Of Prey Odors, Matthew Angelosanto
Examination Of Behavioral Lateralizations In Juvenile Tarantulas In The Presence Of Prey Odors, Matthew Angelosanto
Senior Honors Theses and Projects
The functional and/or structural specialization of the left or right side of the brain (behavioral lateralization) has substantial impacts on the interactions an animal makes with other organisms and its surroundings. While this has been extensively shown throughout vertebrates, it has recently been demonstrated in various taxa of invertebrates. Despite this, its presence in arachnids, and specifically tarantulas, remains poorly understood. The purpose of this study was to determine whether behavioral lateralization is present in the juvenile tarantulas Pterinochilus murinus and Brachypelma albopilosum in response to prey odors. If behavioral lateralization was found, I aimed to detennine how it differed …
The Effects Of Tumor Growth On Stress Response, Body Size, And Fat Content In Caenorhabditis Elegans, Reem Yassine
The Effects Of Tumor Growth On Stress Response, Body Size, And Fat Content In Caenorhabditis Elegans, Reem Yassine
Senior Honors Theses and Projects
Tumorous growth affects nearby healthy tissues, as seen in wasting disease experienced by cancer patients, but the underlying mechanisms are not well understood. We studied tumor growth in C.elegans, a microscopic worm that shares many genes with humans and has the ability to grow tumors in its reproductive system. To test whether tumors cause stress in nearby tissues, we used genetic crosses to create strains containing tumors and fluorescent-based stress reporters for the following physiological stresses: endoplasmic reticulum unfolded protein response (hsp-4p::GFP), heat shock (hsp-6.2p::GFP), and infection (irg-1p::GFP). We found that expression of …
Tablas De Vida Y Parámetros Poblacionales De Una Población De Aedes Aegypti Bajo Las Condiciones No Controladas De Bogotá, Jeimy Tatiana Sua Piñeros
Tablas De Vida Y Parámetros Poblacionales De Una Población De Aedes Aegypti Bajo Las Condiciones No Controladas De Bogotá, Jeimy Tatiana Sua Piñeros
Biología
Las enfermedades transmitidas por vectores tienen una alta importancia en términos de salud en países tropicales. Colombia actualmente destina fondos hacia la lucha anti vectorial enfocándose, entre otros vectores, en Aedes aegypti, culícido vector de los virus que producen dengue, fiebre amarilla, chikunguña y Zika. En Bogotá, hasta ahora, no hay reportes sobre la presencia de la especie, sin embargo, esta ciudad tiene condiciones de altitud que pueden llegar a favorecer las dinámicas de dispersión facilitando el establecimiento del vector. El objetivo de este estudio fue generar conocimiento como tablas de vida, parámetros poblacionales y fortaleza de los adultos al …
Evaluating The Effects Of Antibody-Conjugated Multi-Walled Carbon Nanotubes In Combination With Microwave Irradiation, Amy Chall
Electronic Theses and Dissertations
Cancer remains one of the largest public health concerns of our day, particularly in developed countries where technological advances have allowed populations to live well into their eighth decade. In America, those in their 80’s have a 1 in 2 chance of developing cancer in their lifetime. Prostate cancer, specifically is the second leading cause of cancer deaths in males. Traditional cancer therapies cause high levels of toxicity to the patient due to mechanisms of action that often attack cancer cells and healthy cells alike. The holy grail of cancer research is to find a treatment that targets the cancer …
Player-Coach Perceptions Of Internal Load, Exertion, And Recovery In Collegiate Male Soccer Players, Michelle L. Eisenman
Player-Coach Perceptions Of Internal Load, Exertion, And Recovery In Collegiate Male Soccer Players, Michelle L. Eisenman
Electronic Theses and Dissertations
Periodization of athlete training load to improve performance and maximize recovery, while reducing injuries and overtraining, is essential in team sports. Understanding internal load responses and monitoring athlete exertion and recovery can help coaches during a competitive season. Recovery Status (PRS) and Rating of Perceived Exertion (RPE) are two subjective scales used to help quantify training load and recovery. These scales are more useful if there is an agreement between coaches (C) and players (P) assessment of intensity and recovery. PURPOSE: To assess subjective measures (PRS and RPE scores) from P and C during a 13-week competitive soccer season. Furthermore, …
Quantification Of Aqp11 Paralog Expression In The Osmoregulatory Organs Of Anguilla Rostrata, Keith C. Kurt
Quantification Of Aqp11 Paralog Expression In The Osmoregulatory Organs Of Anguilla Rostrata, Keith C. Kurt
Electronic Theses and Dissertations
Osmoregulation is facilitated by using an assortment of ion and water channels to assist acclimation to changing conditions and to maintain cellular homeostasis. Euryhaline fish can be found in both seawater and freshwater (SW and FW) environments. Expression of ion and water channels have been experimentally demonstrated to change as a fish acclimates to different environmental conditions. Relatively recently, a new group of water channels has been discovered that are primarily intracellular and includes aquaporin 11 (AQP11). Typically, AQPs are located on the cell plasma membrane to allow water to flow in and out of the cell by osmosis to …
Thermal And Low Oxygen Tolerance Of A Southern Population Of Striped Bass (Morone Saxatilis), Daniel A. Lleras
Thermal And Low Oxygen Tolerance Of A Southern Population Of Striped Bass (Morone Saxatilis), Daniel A. Lleras
Electronic Theses and Dissertations
Climate change projections estimate a 2-3°C increase in water temperatures by the end of the century. The amount of habitat with suitable temperature and oxygen concentration for aquatic organisms will also be reduced. Striped bass (Morone saxatilis) inhabiting the rivers in Southeastern Georgia make an interesting study system as they do not participate in summer coastal migrations typical of their northern conspecifics. Instead, fish in this southern population remain in freshwater environments that experience warming and decreases in dissolved oxygen. The present study aims to determine the thermal and low oxygen tolerance of juvenile striped bass collected from …
Bird Window Strikes On A College Campus: Mortality Estimates And Possible Mitigation, Antarius D. Mclain
Bird Window Strikes On A College Campus: Mortality Estimates And Possible Mitigation, Antarius D. Mclain
Electronic Theses and Dissertations
Understanding the impact that human development has on wildlife populations is essential to preserving biodiversity. Bird populations are a good indicator of anthropogenic threats because they are sensitive to environmental change. Window strikes are a major source of mortality for bird populations. Studies have begun to monitor factors that cause window strikes and estimate the amount of birds killed annually by strikes. However, these estimates can be greatly affected by site dependent variables and scavenging of carcasses. My study addresses this issue by answering four questions: First, how many birds are killed annually on campus? Second, what factors complicate making …
Effects Of Climate Variability: A Long-Term Perspective On Leaf Litter Processing In The Ogeechee River, Jose A. Sanchez
Effects Of Climate Variability: A Long-Term Perspective On Leaf Litter Processing In The Ogeechee River, Jose A. Sanchez
Electronic Theses and Dissertations
The Intergovernmental Panel for Climate Change (IPCC) predicts a rise in temperatures and changes to precipitation patterns for the 21st century. These changes are expected to lead to a higher frequency of extreme events such as drought and floods which lead to the alteration of the hydrology, communities, and processes of freshwater ecosystems. Leaf litter decomposition in stream ecosystems is an important component of the energy and nutrient cycle representing a food source for aquatic organisms. This has made it a tool for assessing long term responses to disturbance due to changes in the assemblage of macroinvertebrates that …
The Role Of Local Adaptation On Biting Performance In Trinidadian Guppies, Hannah E. Cohen
The Role Of Local Adaptation On Biting Performance In Trinidadian Guppies, Hannah E. Cohen
Electronic Theses and Dissertations
Divergent selection pressures in populations that occupy different environments can result in phenotypic differentiation in traits that provide a local fitness advantage. Trinidadian guppy (Poecilia reticulata) populations are separated by physical barriers such as waterfalls which result in repeated shifts in selective pressures from predator avoidance in high predation environments towards resource competition in low predation environments. Such shifts in selection pressures have previously shown that a range of locally adapted morphological and behavioral traits are changed. However, the role of local adaptation on biting behaviors remains unclear. I analyzed morphological differences such as body length, jaw position, …
A Review Of Equine Laminitis: Risk Factors And Predispositions, Molly C. Henion
A Review Of Equine Laminitis: Risk Factors And Predispositions, Molly C. Henion
Honors Theses and Capstones
Equine laminitis is a disease of the hoof characterized by inflammation or disruption of the sensitive and insensitive laminae located within the hoof. These structures are responsible for maintaining a secure connection between the third phalanx (P3) and the hoof wall. Damage to these laminae can weaken the attachment between the hoof wall and P3, causing separation and eventual rotation of P3. Equine laminitis can result from multiple triggers, but the most commonly seen cases of the disease are those which are related to endocrinopathy and metabolic related issues. This review will focus on determining the metabolic risk factors associated …
A Developmental Study Of Apoptotic Markers And Histamine In Cephalopod Statocysts, Samantha Nicole Leef
A Developmental Study Of Apoptotic Markers And Histamine In Cephalopod Statocysts, Samantha Nicole Leef
Honors Theses and Capstones
Cephalopods can participate in complex navigation using landmarks that show context due to their statocysts. Statocysts are analogous to the vertebrate vestibular and auditory system encased in cartilage rather than bone making them more easily accessible. Age and anatomical dysfunctions are the reasons for many human vestibular malfunctions. Two of these sources are endolymph hydrops and aging. In the past, endolymph pressure changes were attributed to the ineffectual ion transport. Recent studies have illuminated the possibility of histamine receptors in the semicircular canal could be responsible for patients’ endolymph pressure changes rather than the previous belief that the pressure changes …