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Articles 1 - 11 of 11
Full-Text Articles in Life Sciences
The Effects Of Hydrologic Heterogeneity On Harmful Algal Blooms In Freshwater Reservoir, Lake Sinclair, Georgia, Margaret Blackledge
The Effects Of Hydrologic Heterogeneity On Harmful Algal Blooms In Freshwater Reservoir, Lake Sinclair, Georgia, Margaret Blackledge
Biology Theses
Aquatic habitats are frequently studied after a major water quality problem like the occurrence of an algal bloom. In this study, A proactive rather than a reactive response was considered, where the complexity of conditions conducive to uncontrolled cell growth were studied before a bloom took place by sampling regularly. This study aimed to monitor water quality by monthly sampling of algal communities for approximately one year. As the base of the aquatic food web, algae are a highly diverse group of organisms with varying sensitivity to physical and chemical changes in the environment. Four shallow sites were monitored at …
Shell Calcification And Growth Of The Aquatic Snail Planorbella Trivolvis Under Low Calcium Conditions Typical Of Decalcified Northern Lakes, Shawn A. Witte
Shell Calcification And Growth Of The Aquatic Snail Planorbella Trivolvis Under Low Calcium Conditions Typical Of Decalcified Northern Lakes, Shawn A. Witte
Biology Theses
The water calcium concentration of northern softwater lakes has declined to critically low levels due to numerous anthropogenic stressors, and the availability of calcium is expected to decline further. To assess the impact that critically low water calcium has on aquatic snail shell calcification and growth, juvenile Planorbella trivolvis were raised for 60 days in one of four treatments, each containing a different amount of dissolved calcium (0.64, 1.3, 2.5, and 5.1 mg/L). There was no difference in tissue weight or shell size among treatments, suggesting low water calcium concentrations do not impact adult body mass or size. However, snails …
Developmental And Behavioral Responses Of Early Life Stages Of Fathead Minnows (Pimephales Promelas) To Urban Effluents Treated With Advanced-Oxidation Processes, Amy Cavanaugh
Biology Theses
Wastewater Treatment Plants (WWTP) are the main vector for pharmaceutical and personal care products (PPCPs) to enter waterways. Many PPCPs are lipophilic, allowing them to bioaccumulate and biomagnify within aquatic organisms. PPCPs have been known to alter fish behavior and physiological processes, such as nesting defense and sex ratios, and produce an increase in deformities. Advanced oxidation processes (AOPs) are novel ways for treating WWTPs effluents that use hydroxyl radicals to indiscriminately breakdown PPCPs. In this study, fathead minnows (Pimephales promelas) were used to examine the biological effects of AOP-treated municipal effluent as they developed from eggs to …
Assesment Of Antibiotic Resistant Gene Expression In Clinical Isolates Of Pseudomonas Aeruginosa, Dustin Esmond
Assesment Of Antibiotic Resistant Gene Expression In Clinical Isolates Of Pseudomonas Aeruginosa, Dustin Esmond
Biology Theses
Increasing prevalence of nosocomial infections by antimicrobial resistant pathogens resulting in higher mortality rates and financial burden is of great concern. Pseudomonas aeruginosa represents one of six highly virulent “ESKAPE” pathogens that exhibit considerable intrinsic drug resistance as well as mechanisms for acquiring further resistance. As many of these mechanisms are regulated through gene expression, we sought to identify regulatory strategies and patterns at play in 23 clinical isolates collected from Baku, Azerbaijan and Tyler, Texas, USA. Real-time quantitative polymerase chain reaction was performed on six gene targets implicated in resistance and contrasted with antibiotic phenotypes. We found AmpC cephalosporinase …
Water Quality Assessment Of The Neches River And Anyalysis Of Pathogenic Bacterial Contaminants, Samantha J. Rowe
Water Quality Assessment Of The Neches River And Anyalysis Of Pathogenic Bacterial Contaminants, Samantha J. Rowe
Biology Theses
Several waterways have been flagged in East Texas as being bacterially impaired (containing fecal indicator bacteria), including portions of the upper Neches River. Water quality is important to support healthy aquatic ecosystems as well as the well-being of inhabitants near or downstream of a water body. Many factors can contribute to the water quality of rivers, such as agriculture, recreational use, and urban and industrial growth. This study examined the water quality of specific branches in the Upper Neches River including the Neches River above Lake Palestine and Black Fork Creek. All sample sites were visited during the months of …
Comparative Microbiome Analysis Of The Funfus Gardening Ant Species Trachymyrmex Arizonensis, Chase D. Rowan
Comparative Microbiome Analysis Of The Funfus Gardening Ant Species Trachymyrmex Arizonensis, Chase D. Rowan
Biology Theses
Fungus-growing ants (Attini: Formicidae) and their fungal cultivars participate in ant-fungus mutualism that share a 50-million-year-old coevolutionary history. Fungal cultures are grown in gardens alongside ants and a diverse collection of microbes that interact with both species in mutualistic, commensal, and antagonistic relationships. These microbes aid in digestion and detoxification of food, provide essential nutrients, help in nest hygiene, and play a dominant role in defense against pathogens and disease. Microbial communities of many model species have been shown to change in a laboratory setting as compared to their natural environment. High-throughput 16s sequencing of the V4 variable region was …
Native And Non-Native Ant Impacts On Native Fungi, Chloe Mokadam
Native And Non-Native Ant Impacts On Native Fungi, Chloe Mokadam
Biology Theses
Organisms produce weapons for defense against pathogens and competitors. In response, competitors and pathogens develop resistance to these weapons. However, when a species invades a new range, its “novel weapons” may be more effective against native species that did not co-evolve with them. Via specialized glands and microbial associates, ants produce antifungal weapons for defense against entomopathogenic fungi. However, these weapons may have unintended secondary effects on non-entomopathogenic, soil and seed-borne fungi. The antifungals of non-native ants may be novel weapons, with greater negative impacts on native fungi that have not co-evolved with them. This research aims to test the …
Soil Macroinvertebrates Responses To Wildfires In The Blue Ridge Mountains, Usa, Madeline Olliff
Soil Macroinvertebrates Responses To Wildfires In The Blue Ridge Mountains, Usa, Madeline Olliff
Biology Theses
Fire has been a prevalent disturbance on Earth for millions of years. Around the globe there are several regions that have become fire adapted, including the Southeastern United States. There have been few studies examining the effects of wildland fires on soil macroinvertebrates in the Blue Ridge Mountains, in spite of the importance of these animals to soil processes and their contributions to the biodiversity of these ecosystems. During the fall of 2016, the Southeastern USA experienced numerous, large wildfires. These fires offered an opportunity to study the effects of wildland fire on soil macroinvertebrates. We sampled sites from three …
Molecular Detection Of Pathogenic Leptospira And Microbial Source Tracking Of Fecal Pollution In San Juan, Puerto Rico, Taylor I. Chapman
Molecular Detection Of Pathogenic Leptospira And Microbial Source Tracking Of Fecal Pollution In San Juan, Puerto Rico, Taylor I. Chapman
Biology Theses
Leptospirosis, caused by pathogenic Leptospira, is endemic to tropical regions. Leptospira is released into the environment through the secretion of urine from animals, making it easily transmissible through water sources. The estuarian environment surrounding the area of San Juan, Puerto Rico and its high density of urban development creates ideal conditions for transmission of Leptospirosis. The goal of this study was to determine the presence of Leptospira in these surface waters and use Microbial Source Tracking (MST) to identify the possible source of pathogenic Leptospira. Eighty-seven water samples were collected during the dry (44) and wet (43) seasons. …
Terrestrial Soldier Crab (Coenobita Clypeatus, Fabricius 1787) And Cerion Spp. (Röding 1798) Shell Relationship On San Salvador Island, Bahamas, Harley Hunt
Biology Theses
The Caribbean terrestrial soldier crab, Coenobita clypeatus(Fabricius 1787), coexist and utilize the shells of numerous species of land and marine gastropods. Soldier crabs rely on gastropod shells for protection as the crabs have a soft abdomen, leaving them vulnerable for predation and desiccation, threatening their survival. This creates a strong pressure to obtain well-fitting shells that provide adequate protection against water loss. Cerion of Röding (1798) shells are one of the most commonly used shells among living colonies of C. clypeatuson San Salvador Island. This study is interested in the frequency of shell use by C. clypeatus crabs …
Late Pleistocene Rodents From Clark Quarry, A Vertebrate Fossil Locality In Southeastern Georgia, Parker Rhinehart
Late Pleistocene Rodents From Clark Quarry, A Vertebrate Fossil Locality In Southeastern Georgia, Parker Rhinehart
Biology Theses
Clark Quarry is a Late Pleistocene fossil locality near Brunswick, GA, United States with a diverse vertebrate fauna. Morphological descriptions of Mammuthus columbi (Columbian Mammoth), snakes, amphibians, and birds from Clark Quarry have previously been completed along with a stable isotope analysis of M. columbi and Bison latifrons (Long-horned Bison) enamel. Herein, the rodent fauna is described using primarily teeth recovered by screen-washing quarry sediment. Nine rodent taxa have been identified, two of which are the extinct species Synaptomys australis (Florida Bog Lemming) and Neochoerus aesopi (Late Pleistocene Capybara). Of the remaining seven taxa, Erethizon dorsatum (North American Porcupine) and …