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Articles 1 - 13 of 13
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The Stability Of Epigenetic Variants That Can Act As Loci Causing Phenotypic Change, Raul Faburrieta
The Stability Of Epigenetic Variants That Can Act As Loci Causing Phenotypic Change, Raul Faburrieta
Biology Theses
Epigenetic variations are a possible source of heritable phenotypic variation. In this study I focus on phenotypic alterations seen in epigenetic Recombinant Inbred Lines (epiRILs) of Arabidopsis thaliana. These epiRILs allow me to study the effects differentially methylated regions (DMRs) have on phenotypic variance. In a study performed in 2014 by Cortijo et al., they found that DMR’s affect flowering time and root length when grown under greenhouse conditions. In this study, I replicated the Cortijo et al. (2014) study, with some changes, to see whether the same significant eQTL regions are found. I found that, some of the eQTLs …
Ecological Niche Modeling Of Endemic Texas Crayfish Species Under Current Conditions, Sarah A. Burgett
Ecological Niche Modeling Of Endemic Texas Crayfish Species Under Current Conditions, Sarah A. Burgett
Biology Theses
Crayfish play many important roles in freshwater ecosystems such as ecosystem engineering, bioindicator, and food resource. Even though they are important to ecosystems, they are highly understudied. There has been previous work done on ecological niche modeling on Texas crayfish species, but this study takes it a step further by combining soil, climate, and hydrology variables to model the ecological niches of three endemic species: Procambarus texanus, Procambarus nueces, and Procambarus fayettei. Ecological niche models were created for the three species of interest using the program Maxent. I found that P. texanus and P. fayettei have indistinguishable …
Toward Accelerometer Recording Of Pit Viper Foraging Behavior In Nature: Validation And Case Study With Timber Rattlesnakes (Crotalus Horridus), Morgan L. Thompson
Toward Accelerometer Recording Of Pit Viper Foraging Behavior In Nature: Validation And Case Study With Timber Rattlesnakes (Crotalus Horridus), Morgan L. Thompson
Biology Theses
Accelerometer dataloggers are becoming increasingly common in field studies of animal behavior. Among the most difficult study subjects, and consequently, the most ideal candidates for accelerometer applications, are those for which simultaneous observation of key fitness-determining behaviors, such as foraging, across a sample of individuals in the wild is traditionally impossible or restricted to the use of proxy measures. This is the case for many solitary vertebrate predators, such as all pit vipers (Viperidae; Crotalinae). Large-bodied pit vipers are ambush (sit-and-wait) specialists that represent uniquely challenging and intriguing study subjects in predator ecology. Unlike many comparable avian or mammalian terrestrial …
Filamentous Green Algae (Cladophora Glomerata) In Near Shore Lake Ontario: An Investigation Of Tissue And Water Nutrient Dynamics Through A Period Of Growth And Decomposition., James L. Wagner Jr
Filamentous Green Algae (Cladophora Glomerata) In Near Shore Lake Ontario: An Investigation Of Tissue And Water Nutrient Dynamics Through A Period Of Growth And Decomposition., James L. Wagner Jr
Biology Theses
Cladophora glomerata, a filamentous green alga abundant in the Laurentian Great Lakes, has long been considered a nuisance throughout the region. Previous phosphorus (P) abatement practices and legislation successfully reduced the abundance of the algae, but with the introduction of dreissenid mussels, a resurgence has been observed. Though there is substantial literature and modeling of the growth cycle of Cladophora, relatively little research has been dedicated to the decomposition stage of the algae, a period which may contribute to a substantial influx of nutrients to near-shore environmental regions. By first examining a period of in-situ growth within Lake …
A Multivariate Ecological Approach To Delineate Unionid Freshwater Mussel Species, Ava M. Laszlo
A Multivariate Ecological Approach To Delineate Unionid Freshwater Mussel Species, Ava M. Laszlo
Biology Theses
Freshwater mussels represent one of the most imperiled faunal groups on the planet and are critical to freshwater ecosystems. If mussel species are not carefully defined, our conservation plans may miss differences in the habitat needs of different species and the conservation strategies may not be as successful. Because ecological niche models can be used to provide evidence to support similar or dissimilar ecological niches and habitat requirements, I used modelling to forecast suitable habitat for Fusconaia askewi and F. lananensis, two purported threatened Texas species. The modeling results indicated that these species are not ecologically different. Based upon …
The Effects Of Socotra Cormorant Nesting Activities On Terrestrial Invertebrates Diversity And Abundance, Hiba Obaid Darwish Alshehhi
The Effects Of Socotra Cormorant Nesting Activities On Terrestrial Invertebrates Diversity And Abundance, Hiba Obaid Darwish Alshehhi
Biology Theses
Seabirds breed on off-shore islands or cliffs often in large aggregations during their 2- 6 month breeding seasons. During this period, seabirds perform an important role in the allochthonous transport of marine nutrients into these terrestrial environments. Depending on the size and density of these aggregations, the impact could be alteration of soil chemistry, vegetation or invertebrate diversity and distribution patterns, primarily through the deposition of large quantities of guano. We studied the impact of breeding aggregations of the Socotra Cormorants (Phalacrocorax nigrogularis) on Siniya Island, Umm Al Quwain, United Arab Emirates, typically ranging between 26,000 to 41,000 breeding pairs. …
Polyploidy And Hybridization Have A Role In Plant Distribution In The United States: A Bioinformatics Study, Andrea Ortiz
Polyploidy And Hybridization Have A Role In Plant Distribution In The United States: A Bioinformatics Study, Andrea Ortiz
Biology Theses
Introduction: Polyploidy is the doubling of a genome. Autopolyploidy and allopolyploidy are two different modes of genome duplication. These events are common in angiosperms and usually involve diploids and tetraploids, a resulting polyploid species. Both cytotypes exhibit competitive exclusion and environmental adaptation according to their spatial distributions. My research focuses on how abiotic environmental factors affect the range and the amount of range overlap of the taxon within the Callisia graminea and Allium canadense systems over time. Niche modeling determines whether there is substantial niche overlap between the Callisia graminea diploid and tetraploid, whether range shifts occur between the Callisia …
Integrating Habitat Suitability Modeling And Radio Telemetry To Describe Habitat Use Of The Western Massasaugas, Sistrurus T. Tergeminus, In Texas, Mitchell R. Barazowski
Integrating Habitat Suitability Modeling And Radio Telemetry To Describe Habitat Use Of The Western Massasaugas, Sistrurus T. Tergeminus, In Texas, Mitchell R. Barazowski
Biology Theses
Habitat suitability modeling using the software package MaxEnt (Phillips, Anderson, & Schapire, 2006) is a popular method for describing the habitat of rare species. MaxEnt uses “presence only” data to develop models; however presence data are highly skewed towards areas of high detection probability and these areas may not represent the full range of habitat use. Thusly, predictions from models developed using only data from areas with high detection probability may not represent all suitable habitat. This study tested the ability of MaxEnt models developed using three different data sets to accurately describe Western Massasauga (Sistrurus t. tergeminus) habitat at …
Rna Interference: Potato/Tomato Psyllid, Bactericera Cockerelli, Oral Delivery Of Double-Stranded Rnai Construct, Bijaya Kumar Sharma
Rna Interference: Potato/Tomato Psyllid, Bactericera Cockerelli, Oral Delivery Of Double-Stranded Rnai Construct, Bijaya Kumar Sharma
Biology Theses
The potato/tomato psyllid, Bactericera cockerelli (Sulc.), is a serious and economically important pest of the potato, tomato and other solanaceous crops. This insect is the putative primary vector of the phytopathogenic bacterium Candidatus Liberibacter solanacearum which causes the Zebra Chip in potato. This disease has caused millions of dollars loss to the potato industry. While traditional management programs have minimized the negative impacts of this disease system, a sustainable alternative to chemical treatment is needed. Management of this pest by downregulation of endogenous mRNA using RNA interference (RNAi) technology is one of the best molecular method available; however, several technical …
Bactericera Cockerelli (Sulc) (Hemiptera: Triozidae): Nearly Complete Mitochondrial Genome, Single Mitochondrial Genes And Complete Mitochondrial Genome Comparison, And Insecticide Resistance Genes Of Potato Psyllid Populations From North America, Amalia Rosa Lopez Montiel
Biology Theses
The potato psyllid, Bactericera cockerelli (Sulc.), is an economic pest of potatoes and other solanaceous crops, and the vector of the causal agent of zebra chip disease. The expanded distribution of the potato psyllid has resulted in the differentiation of biotypes (central and western), and haplotypes (southwestern and northwestern), according to analysis of the mitochondrial gene cytochrome oxidase I (COI). In this study, the nearly complete (part of the control region unsequenced) mitochondrial genome from potato psyllid populations occurring in North America: Texas, Nebraska, California, Washington, northwest (Washington) and southwest (Arizona), were sequenced using next generation sequencing technology. The raw …
Bactericera Cockerelli: Range Expansion, Candidatus Liberibacter Solanacaerum Detection, And Microbial Community Analysis, Alex Arp
Biology Theses
The potato psyllid (Bactericera cockerelli) is an emerging pest of solanacious crops. Traditionally their range expanded from Guatemala north through the central United States and into southern California. Recent expansions have led to potato psyllids residing as far south as Nicaragua and as for north as Washington State. Potato psyllids were also accidentally imported into New Zealand. These expansions are alarming because potato psyllids transmit Candidatus Liberibacter solanacaerum (Lso), the bacteria associated with Zebra Chip disease in potato, which results in millions of dollars in damages annually. In this study, potato psyllid and Zebra Chip range expansion into Central America …
Ground-Truthing Maxent In East Texas Rivers, David F. Ford
Ground-Truthing Maxent In East Texas Rivers, David F. Ford
Biology Theses
Unionid mussels are a guild of freshwater, sedentary filter-feeders, which play a critical role in freshwater systems. Mussels are currently experiencing a global decline in both species richness and abundance, due to invasive species, human alteration of water systems, and climate change. In North America, which is considered to have the highest global diversity of bivalve species, native mussels are currently declining rapidly with at least 37 species considered to already be extinct. If extant mussel species are to be preserved, then it is vital that conservation efforts be prioritized towards areas in which they are likely to be found. …
Influence Of Substrate And Hydraulic Variables On Habitat Preferences Of A Sculptured And An Unsculptured Freshwater Mussel, Daniel Goodding
Influence Of Substrate And Hydraulic Variables On Habitat Preferences Of A Sculptured And An Unsculptured Freshwater Mussel, Daniel Goodding
Biology Theses
Freshwater mussels of the family Unionidae in North America have been in decline for at least the past 150 years. Major causes behind the decline are thought to be related to alteration or loss of habitat. Recent efforts by researchers have focused on understanding habitat associations of mussels so that more effective conservation efforts can be applied. Recent studies have identified variables that limit mussel community distributions. These variables are a combination of substrate and hydraulic variables that are associated with substrate stability. Furthermore, recent studies have suggested mussel studies are most informative at larger spatial scales and at high …