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Articles 211 - 240 of 792
Full-Text Articles in Biology
Too Wet For Frogs, Too Dry For Lizards: Role Of Changing Precipitation On Tropical Frogs And Arid Lizards, Mason J. Ryan
Too Wet For Frogs, Too Dry For Lizards: Role Of Changing Precipitation On Tropical Frogs And Arid Lizards, Mason J. Ryan
Biology ETDs
During the course of the Anthropocene, humans have modified the landscape and atmosphere resulting in increased global temperatures and intensification of the hydrologic cycle over the last 100 years. Amphibians and reptiles are especially vulnerable to climate change because of their ectothermic physiology and sensitivity to changes in water availability. The role of moisture or precipitation in ectotherm responses to climate change has not been well studied, but moisture plays a vital role in all aspects of the lives of lizards and frogs. It is exceedingly difficult to study the ecological effects of changing precipitation patterns due the stochastic nature …
Bacteriophage Host-Range Expansion To Include Two Strains Of Clostridium Sporogenes, Kevin K. Crown
Bacteriophage Host-Range Expansion To Include Two Strains Of Clostridium Sporogenes, Kevin K. Crown
Biology ETDs
Bacteriophages are viruses that infect bacteria, which have been used to treat bacterial infections in people for decades. They are also now being used as FDA approved preservatives as a means to prevent the growth of spoiling bacteria in many ready-to-eat foods. Bacteriophages tend to infect a very narrow range of bacterial hosts, some only a single sub-strain. When used for therapeutics or food treatment however, it is desirable to use phages that are promiscuous in their host range. This has led to attempts to broaden the host range of the most useful phages. By passaging phages in co-cultures of …
A Morphological Phylogenetic Analysis And Taxonomic Revision Of The Millipede Family Atopetholidae (Chamberlin) (Diplopoda: Spirobolida) With Descriptions Of New Species And The Conservation Status Of Comanchelus Chihuanus (Chamberlin 1947) (Diplopoda: Spirobolida: Atopetholidae), A Species Of Concern, Michael F. Medrano
Biology ETDs
The taxa of family Atopetholidae Chamberlin 1918 occurring in the southwestern US and Mexico, including Baja California, are revised with new records and species from collections that have never been evaluated. Five new genera, Aculeulus, Bajabolus, Choixulus, Pinnaulus and Tamaulus and twenty new species, Aculeulus monicae, Arinolus anahiae, Arinolus sequoiaensis, Arinolus shelleyi, Atopetholus lowreyi, Atopetholus milleri, Atopetholus westi, Bajabolus bernadinoensis, Bajabolus lapazensis, Choixulus valdezi, Eurelus alisonae, Eurelus isaiasi, Eurelus marisae, Pinnaulus fieldsi, Tamaulus brantleyae, Tamaulus justini, Tamaulus maribelleae, Tamaulus miae, Tamaulus wardae and Watichelus sheari are described using morphological data and 18 synonyms are proposed for a total fauna of …
Community Ecology, Climate Change And Ecohydrology In Desert Grassland And Shrubland, Matthew Daniel Petrie
Community Ecology, Climate Change And Ecohydrology In Desert Grassland And Shrubland, Matthew Daniel Petrie
Biology ETDs
This dissertation explores the climate, ecology and hydrology of Chihuahuan Desert ecosystems in the context of global climate change. In coming decades, the southwestern United States is projected to experience greater temperature-driven aridity, possible small decreases in annual precipitation, and a later onset of summer monsoon rainfall. These changes may have profound consequences for ecological systems in the Chihuahuan Desert, which are intensely water-limited and respond to even small pulses of moisture availability. The first chapter (Chapter 2) compares change in the properties of monsoon season precipitation from 1910-2010 in the northern Chihuahuan Desert region to local variability in monsoon …
Bridging Structure And Function In Semi-Arid Ecosystems By Integrating Remote Sensing And Ground Based Measurements, Dan J. Krofcheck
Bridging Structure And Function In Semi-Arid Ecosystems By Integrating Remote Sensing And Ground Based Measurements, Dan J. Krofcheck
Biology ETDs
The Southwestern US is projected to continue the current significant warming trend, with increased variability in the timing and magnitude of rainfall events. The effects of these changes in climate are already evident in the form of multi-year droughts which have resulted in the widespread mortality of woody vegetation across the region. Therefore, the need to monitor and model forest mortality and carbon dynamics at the landscape and regional scale is an essential component of regional and global climate mitigation strategies, and critical if we are to understand how the imminent state transitions taking place in forests globally will affect …
Aret: A Novel Regulator Of Alternative Splicing In The Flight Muscle Transcripts In Drosophila Melanogaster, Sandy Thi Oas
Aret: A Novel Regulator Of Alternative Splicing In The Flight Muscle Transcripts In Drosophila Melanogaster, Sandy Thi Oas
Biology ETDs
Drosophila melanogaster has been used as a model organism for understanding muscle development. Drosophila flight and jump muscles are distinct functionally and biochemically. This distinction is due to differentially expressed genes and differentially spliced mRNA transcripts. The exact mechanism of alternative splicing in somatic muscles is not well characterized. Aret was previously shown to be a transcriptional repressor, and has been implicated in splicing regulation based upon literature analysis and preliminary work. This study aims to define the regulatory role of Aret and the impact of alternative splicing on determining muscle diversification and fiber choice. We indicate the importance of …
Diversification And Adaptation In The Andes: Insights From Phylogeography, Malaria, And Hemoglobin Of The House Wren (Troglodytes Aedon), Spencer C. Galen
Diversification And Adaptation In The Andes: Insights From Phylogeography, Malaria, And Hemoglobin Of The House Wren (Troglodytes Aedon), Spencer C. Galen
Biology ETDs
The tropical Andes of South America represent a highly complex landscape characterized by physical barriers to dispersal and stark ecological gradients. The study of intraspecific genetic diversity in widespread Andean species has the potential to elucidate the historical biogeographic events that have driven diversification as well as the processes by which organisms have adapted to their environments in this region. The house wren (Troglodytes aedon) provides a convenient system for the study diversification and adaptation in the Andes, as it is distributed widely across both biogeographic barriers and heterogeneous environments. In chapter one, I utilize house wren and malaria parasite …
Evaluating The Utility Of Natural History Collections In Research And For The Public, Bethany L. Abrahamson
Evaluating The Utility Of Natural History Collections In Research And For The Public, Bethany L. Abrahamson
Biology ETDs
Natural history collections (NHCs) are useful in many fields of study, but knowledge about how they are used in the modern day is poor. The first part of this study, focused on the collections data held by the Museum of Southwestern Biology (MSB), analyzes specimen-based publications, specimen loan records, and guestbook information to determine how NHCs have been used in scientific study over time. Using a novel methodology, I objectively sorted the publications into ten research subjects via particular phrases found in publication titles, places of publication, and keywords. I observed from this dataset the proportions of particular subjects for …
Population And Metapopulation Ecology Of Childhood Diseases, Christian E. Gunning
Population And Metapopulation Ecology Of Childhood Diseases, Christian E. Gunning
Biology ETDs
Researchers have long used mathematical models and empirical data to explore the population ecology of childhood diseases such as measles and whooping cough. These diseases have proven ideal model systems for studying population dynamics over space and time. Here we present a novel dataset of weekly measles and whooping cough case reports in pre-vaccine era U.S. cities and states, along with a previously- studied dataset of measles in England & Wales. We first estimate per-population disease reporting probabilities. We find that disease reporting is highly variable over space and between diseases, and correlated with socioeconomic covariates including ethnic composition and …
The Microbiome Of Rainbow Trout (Oncorhynchus Mykiss), Liam T. Lowrey
The Microbiome Of Rainbow Trout (Oncorhynchus Mykiss), Liam T. Lowrey
Biology ETDs
Commensal organisms are an integral part of all vertebrates, contributing heavily to development, pathogen defense, and metabolism. Commensals reside at different body sites within vertebrate animals creating unique and distinct communities that vary between locations. The human microbiome project has revealed distinct bacterial community compositions at the diverse range of body sites that have been sampled, providing evidence for different functional purposes of each microbiome. Rainbow trout, Oncorhynchus mykiss, serves as a model organism for the study of mucosal physiology and immunology. Teleost fish are evolutionarily important as one of the first jawed vertebrates with a dedicated adaptive mucosal immune …
Defining The Complexities Of Mef2 Function And Regulation In Drosophila, Tyanna L. Lovato
Defining The Complexities Of Mef2 Function And Regulation In Drosophila, Tyanna L. Lovato
Biology ETDs
The development of cardiac and somatic muscle is coordinated by many factors that are highly conserved across species. Mutations in the coding or regulatory sequences of a gene can alter the structure, function or levels of expression of the protein it encodes. We have identified the genetic mechanism underlying the temperature sensitive mutation in MEF2 (myocyte enhancer factor 2), which is required for the differentiation of all muscle lineages. In addition, we have identified a regulatory element upstream of the Mef2 gene that directs its expression from stage fourteen through the end of embryogenesis which is activated by the NK-homeobox …
The Effects Of Intestinal Sulfate-Reducing Bacteria On Cognitive Behavior And Intestinal Transit In Mice, Nathaniel Ritz
The Effects Of Intestinal Sulfate-Reducing Bacteria On Cognitive Behavior And Intestinal Transit In Mice, Nathaniel Ritz
Biology ETDs
This research reports the effects of two metabolic groups of bacteria on physiological activity and cognitive function in C57BL/6 mice. In one experiment, the mice on a diet supplemented with red kidney bean for 24 hr were able to complete an eight-arm radial learning maze in a shorter time than mice on a diet without red kidney beans. The median time required for mice to complete the maze when fed red kidney beans was 118 sec while the median time for mice on standard diet to finish the maze was 270 sec. Based on the cycle threshold values when using …
Living On The Edge: A Comparative Phylogeographic Study Of Refugial And Insular Fragmentation, Yadéeh Escobedo Sawyer
Living On The Edge: A Comparative Phylogeographic Study Of Refugial And Insular Fragmentation, Yadéeh Escobedo Sawyer
Biology ETDs
Pleistocene glacial-interglacial cycles resulted in population isolation that led to inter- and intra- specific genetic divergence in many North American species. The magnitude of isolation also influenced species response to these climatic changes and set the stage for contemporary gene flow. We can refine our understanding of species response to historical climate change by identifying regions of ice-free persistence and refugia during glacial maxima, and geographic locations and genetic dynamics of post-glacial secondary contact. This dissertation examines the role of glacial cover, geographic barriers, habitat fragmentation as a result of changes in sea level, and insularity on the contemporary genetic …
Establishment Of Larrea Tridentata At The Northern Edge Of The Modern Mojave Desert: Insights From Neotoma Paleomiddens, Clare E. Steinberg
Establishment Of Larrea Tridentata At The Northern Edge Of The Modern Mojave Desert: Insights From Neotoma Paleomiddens, Clare E. Steinberg
Biology ETDs
Shifting climates affect the composition of biological communities. If environmental conditions change sufficiently, new species can invade, leading to large-scale community turnover. Understanding how and why such shifts occur is crucial in this era of anthropogenic global change. Paleontological studies provide a valuable long-term perspective of the dynamics of community turnover. Here, we examine changes in the plant community over the past 34 thousand years in what is now the northern Mojave Desert. This time period includes the last glacial maximum as well as numerous smaller climatic fluctuations in the Holocene and the end of the Pleistocene. We quantified plant …
Phylogenetic Revision Of The Genus Arenivaga (Rehn) (Blattodea: Corydiidae), With Descriptions Of New Species, A Key To The Males, And An Investigation Of Its Ecological Niche, Heidi Hopkins
Biology ETDs
The cockroach genus Arenivaga is revised. Forty-eight Arenivaga species are recognized with nine previously known species and 39 described as new including the following: A. pagana sp. n., A. grandiscanyonensis sp. n., A. haringtoni sp. n., A. hopkinsorum sp. n., A. umbratilis sp. n., A. tenax sp. n., A. impensa sp. n., A. trypheros sp. n., A. darwini sp. n., A. nalepae sp. n., A. sequoia sp. n., A. mckittrickae sp. n., A. gaiophanes sp. n., A. belli sp. n., A. estelleae sp. n., A. delicata sp. n., A. mortisvallisensis sp. n., A. milleri sp. n., A. pratchetti sp. n., …
Analysis Of Genes Required For Quiescent Cell Formation In Stationary Phase Cultures Of Saccharomyces Cerevisiae, Melissa R. Wilson
Analysis Of Genes Required For Quiescent Cell Formation In Stationary Phase Cultures Of Saccharomyces Cerevisiae, Melissa R. Wilson
Biology ETDs
Yeast cells in stationary phase cultures, after several days growth in rich, glucose-based medium (YPD), are separable by density-gradient centrifugation into two fractions. The heavier, quiescent cells are mostly virgin daughters whereas the less-dense, non-quiescent cells, are a typical mixture of daughters to aged cells. Quiescent cells can also be separated based on expression of specific GFP-tagged proteins, including many that are localized to the mitochodria. To ask the question, what genes are required for this differentiation process, we used a combination of the diploid, homozygous yeast deletion set, the heterozygous deletion set (carrying one deleted 'essential' gene) and a …
Abiotic Drivers Of Chihuahuan Desert Plant Communities, Laura Marie Ladwig
Abiotic Drivers Of Chihuahuan Desert Plant Communities, Laura Marie Ladwig
Biology ETDs
Within grasslands, precipitation, fire, nitrogen (N) addition, and extreme temperatures influence community composition and ecosystem function. The differential influences of these abiotic factors on Chihuahuan Desert grassland communities was examined within the Sevilleta National Wildlife Refuge, located in central New Mexico, U.S.A. Although fire is a natural disturbance in many grasslands, fire during drought temporarily increased forb cover and decreased grass cover for several years. The seasonal timing of fire was not important, rather community recovery was more influenced by the persistent drought conditions. N deposition is increasing worldwide due to human activities, and although additional N increases productivity and …
Disentangling Historical Biogeography And Anthropogenic Introductions: A Case Study Of Red Shiner (Cyprinella Lutrensis), Tracy A. Diver
Disentangling Historical Biogeography And Anthropogenic Introductions: A Case Study Of Red Shiner (Cyprinella Lutrensis), Tracy A. Diver
Biology ETDs
Aim: Determine evolutionary events that have shaped observed patterns of diversity in Red Shiner within the Rio Grande Basin, New Mexico. Location: Pecos, Delaware, Rio Grande and Canadian Rivers, New Mexico, United States. Methods: We used DNA sequence data from two mitochondrial genes (cytochrome b and ND4), nuclear RAG-1 intron, and geometric-morphometric and meristic data to test alternative hypothesis regarding the evolutionary history of native populations of Red Shiner in New Mexico. Results: MtDNA gene trees revealed deeply divergent lineages (Great Plains and Coastal) with in situ diversification within each geographic lineage between the Rio Grande and Pecos River. Nuclear …
The Effects Of Precipitation Manipulation On Carbohydrate Dynamics And Mortality In A Piñon-Juniper Woodland, Lee Turin Dickman
The Effects Of Precipitation Manipulation On Carbohydrate Dynamics And Mortality In A Piñon-Juniper Woodland, Lee Turin Dickman
Biology ETDs
Drought-induced forest mortality is an increasing global problem with far-reaching consequences, yet mortality mechanisms remain poorly understood. Depletion of non-structural carbohydrate (NSC) stores has been implicated as a major factor in drought-induced mortality, but experimental field tests are rare. We conducted an ecosystem-scale precipitation manipulation experiment and evaluated leaf and twig NSC dynamics of two co-occurring conifers with different water regulation strategies; the relatively drought-averse piñon pine (Pinus edulis) and relatively drought-tolerant oneseed juniper (Juniperus monosperma). Experimental drought caused decreased leaf starch in dying trees of both species and increased allocation to glucose and fructose in juniper, consistent with osmoregulation …
Systematics Within The Zopheridae Complex (Coleoptera: Tenebrionoidea), Nathan Patrick Lord
Systematics Within The Zopheridae Complex (Coleoptera: Tenebrionoidea), Nathan Patrick Lord
Biology ETDs
The Ironclad Beetles, Cylindrical Bark Beetles, and Monommatid Beetles are a cosmopolitan family with over 1,700 species worldwide. Now constituting members from three previous families (Zopheridae, Monommatidae, Colydiidae), Zopheridae represent a wide array of morphological diversity and variability. Larvae of most members are fungivores/detritovores, while some are suspected of boring into sound wood. Adults are predaceous or fungivores, and some zopherids have been linked to the spread of fungal disease. Morphologically, adults are hard to separate from other tenebrionoid families. Zopherids can be distinguished by 9-11 segmented antennae with a usually abrupt, 1-3 segmented club, antennal insertions concealed from above, …
Molecular Characterization Of The Freshwater Snail Physella Acuta, Journey R. Nolan
Molecular Characterization Of The Freshwater Snail Physella Acuta, Journey R. Nolan
Biology ETDs
Current insights into general animal biology, including immune function, are derived mostly from a few model organisms, a necessity imposed by effort required for in-depth studies. Modern next-generation sequencing (NGS) enables genomics-level investigations to test whether specific aspects of biology are general or unique across animal phylogeny. Meaningful comparisons require thorough identification of phylogenetically-relevant species. To provide a touchstone for Biomphalaria glabrata, a freshwater snail that is a major study model for invertebrate immunity, physid snails (Physidae; Hygrophila; Panpulmonata; Gastropoda; Mollusca) will be developed as a model for comparative immunogenomics. Chapter 1 introduces current research capabilities and details the rationale …
Mhc And Mate Choice In Anolis Sagrei, Angela S. Hung
Mhc And Mate Choice In Anolis Sagrei, Angela S. Hung
Biology ETDs
The study of sexual selection saw its intrepid inception when Charles Darwin observed the earnest with which many male birds must court a female before she will, but often not, mate with him. His idea of the choosy female' was a radical one in the Victorian era when women were regarded as the 'passive sex. In the century and a half that followed, sexual selection driven by female choice is now widely accepted and strongly supported. Today, with emerging technologies, the nuances and complexities of sexual reproductive are finally coming to light. Female choice in two species is described here. …
Scaling Of Crop Diversity And Optimal Allocation Of Foodshed Infrastructure, Michael Chang
Scaling Of Crop Diversity And Optimal Allocation Of Foodshed Infrastructure, Michael Chang
Biology ETDs
Food hubs are organizations that manage the aggregation and distribution of local products, and are a small, but growing means to satisfy high demand for diverse, healthy diets. However, economic barriers inhibit small producers and distributors from developing mainstream, local consumer alternatives to industrial-scale products. To build foodshed, distribution hubs could help overcome these challenges by reducing costs through shared refrigeration, processing, and transportation infrastructure. However, there is no theory to help plan them. I present and test theory to allocate foodshed infrastructure based on insight by Dunn, et al. (2011) that Shannon diversity measured relative to a whole set …
The Effects Of Climate Change On Stream Invertebrates In Their Role As Biological Indicators And Responders To Disturbance, Anna T. Hamilton
The Effects Of Climate Change On Stream Invertebrates In Their Role As Biological Indicators And Responders To Disturbance, Anna T. Hamilton
Biology ETDs
Global climate models provide estimates of future changes in air temperature and precipitation patterns, drought, flooding, sea-level rise, and increases in the frequency, duration, and intensity of extreme heat and storm events. These climate changes will affect stream invertebrate communities directly, indirectly, and through interactions with other stressors, resulting in a range of biological responses, including species range shifts, losses and replacements, novel community compositions, and altered ecosystem functions and services. Effects will vary regionally and present heretofore unaccounted influences on biomonitoring, which water-quality agencies use to assess the status and health of ecosystems as required by the Clean Water …
Sympatric Speciation Is Reinforced By Predation, Parasite Load, Reproductive Character Displacement, And Sexual Selection In Two Species Flocks Of Pupfish (Cyprinodon Spp), Rhiannon J. D. West
Sympatric Speciation Is Reinforced By Predation, Parasite Load, Reproductive Character Displacement, And Sexual Selection In Two Species Flocks Of Pupfish (Cyprinodon Spp), Rhiannon J. D. West
Biology ETDs
Sympatric speciation, the divergence of one lineage into two or more lineages within one geographic range, is often driven by disruptive selection on niche utilization. While niche specialization is found in sympatrically speciated groups, it is often reinforced by other strong selective pressure. This dissertation examines the role of predation, morphology, mate choice, and parasite load in maintaining reproductive isolation in two sympatrically speciated species flocks of pupfish (Cyprinodon). The role that predation, morphology and male and female mate choice play in reproductive isolation is examined in the Bahamian species flock. To examine the role of predation, we focus on …
Exploring Signals Of Historical Demography In Boreal Mammals Through Integration Of Statistical Conservation Phylogenetics, Taxonomy, And Comparative Phylogeography, Jason L. Malaney
Biology ETDs
Understanding how diversity is partitioned across the landscape can provide perspectives related to the environmental processes that have influenced the evolutionary history of organisms. This main idea, often termed phylogeography, serves as the backdrop to my research where I explore three broad concepts including historical biogeography, cryptic diversity and ecology, and conservation phylogenetics. I address various questions in each of these concepts by using a set of mammals that are associated with montane and mesic environments of North America. More specifically, I focus on the jumping mice (Zapodidae) to test hypotheses that scale to the broader community. This approach allows …
Regulation Of Hydraulic Function And Consequences For Drought-Related Mortality In Mature Woody Plants, Jennifer A. Plaut
Regulation Of Hydraulic Function And Consequences For Drought-Related Mortality In Mature Woody Plants, Jennifer A. Plaut
Biology ETDs
Precipitation and temperature patterns are expected to shift over at least the next century due to anthropogenic climate change. Effects of these shifts may be felt most acutely in arid and semi-arid regions where water is already the most limiting resource. Vegetation mortality due to drought is a likely outcome of predicted future climate, with consequences for ecosystem structure and function and feedbacks on regional and global climate. Yet, mechanisms and interactions of key plant drought responses and the end-point of mortality remain poorly understood. In this dissertation I examine the roles of xylem cavitation resistance and stomatal control of …
Life History And Morphometric Variation Of Gambusia Nobilis At Bitter Lake National Wildlife Refuge, Alyssa Renee Hopkins
Life History And Morphometric Variation Of Gambusia Nobilis At Bitter Lake National Wildlife Refuge, Alyssa Renee Hopkins
Biology ETDs
The Pecos Gambusia, Gambusia nobilis, is an endangered, live bearing fish inhabiting sinkholes in a restricted range of the Pecos River Watershed in New Mexico and Texas. The sink holes at Bitter Lake National Wildlife Refuge (BLNWR), Roswell, NM create isolated habitats with varying ecological conditions (habitat size, community composition, dissolved oxygen, salinity and pH). This ecological variation imposes unique selective pressures that may shape differences in life history characteristics and morphology between populations. The goals of this research were to characterize seasonal and population variation in 1) life history characteristics, 2) embryo development patterns, 3) morphology and 4) explore …
A Holarctic Perspective On Mammalian Evolution: The Evolutionary And Biogeographic History Of Red-Backed Voles And Their Close Relatives (Rodentia: Arvicolinae), Brooks A. Kohli
Biology ETDs
The influence of Quaternary environmental changes on demography and geographic distribution is paramount to understanding how contemporary genetic diversity is partitioned in high-latitude species. This history of change in northern ecosystems sets the stage for forecasting how species inhabiting tundra and boreal forest will respond to the ongoing shift in climate. Utilizing broad geographic and taxonomic sampling, a multilocus species tree approach, ecological niche models, and population genetic techniques, I investigate the evolutionary and biogeographic history of a Holarctic mammal, the northern red-backed vole (Clethrionomys rutilus) and the systematics of the tribe it belongs to, Clethrionomyini. This tribe of forest …
Molecular Control Of Muscle Patterning, Development And Stability In Drosophila, Elisa Mignon Labeau Dimenna
Molecular Control Of Muscle Patterning, Development And Stability In Drosophila, Elisa Mignon Labeau Dimenna
Biology ETDs
Muscle is a highly conserved and specialized tissue in animals. Failure of proper muscle patterning, maintenance and stability in animals can have variety of consequences for the individual. Mutations in loci that control muscle can result in death during embyogenesis, dysmorphism, and/or reduced lifespan after progressive muscle degeneration (Emery 2002, Mathews and Moore 2003, Amato and Griggs 2011). Muscle defects, such as these, have origins ranging from improper transcriptional control to direct sequence disruptions in proteins that play a wide variety of roles in the cell (Emery 2002, Mathews and Moore 2003, Amato and Griggs 2011). Thus, out of this …