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Articles 661 - 690 of 873
Full-Text Articles in Biology
Impact Of Self-Fertilization On Fecundity, The Timing Of First Reproduction, And Population Genetic Structure: Is A Mate Worth The Wait?, Serena Caplins
Impact Of Self-Fertilization On Fecundity, The Timing Of First Reproduction, And Population Genetic Structure: Is A Mate Worth The Wait?, Serena Caplins
Theses and Dissertations
Organisms capable of self-fertilization typically exhibit two evolutionary syndromes uniting high inbreeding depression with low levels of selfing, or low inbreeding depression and high levels of selfing. This study tests for inbreeding depression in an apparent self-compatible, hermaphroditic marine nemertean worm, Prosorhochmus americanus. Fecundity and timing to first reproduction were assessed in isolated and paired worms. Isolated worms produced significantly more offspring than paired worms and did not show inbreeding avoidance. The selfing rate of natural populations was evaluated using species-specific microsatellites and is consistent with preferential selfing (mean: 0.801), though some outcrossing appears to take place. Population genetic structure …
Genetic And Molecular Analysis Of The Maize R1 Locus, Jennifer Derkits
Genetic And Molecular Analysis Of The Maize R1 Locus, Jennifer Derkits
Theses and Dissertations
Canalization, the stability of phenotypes in the presence of a specific genotype and environment is important for trait selection and understanding gene expression pathways. The goal of this study was to investigate mechanisms involved in the loss of canalization at the maize r1 locus. A specific lightly colored R-sc derivative, R-sc:86-17(L), was mutagenized with ethyl methyl sulfonate (EMS), and the progeny screened for restoration of dark seed color and canalization. Putative revertants/mutants were mapped relative to the r1 locus, tested for complementation to each other to identify a minimum number of genes involved in canalization, tested for cis silencing of …
Inhibition Of Retinoic Acid Receptors Results In Defasciculation Of The Trigeminal Nerve In Xenopus Laevis, Jeremy Thompson
Inhibition Of Retinoic Acid Receptors Results In Defasciculation Of The Trigeminal Nerve In Xenopus Laevis, Jeremy Thompson
Theses and Dissertations
The anatomy of the cranial peripheral nervous system has been studied for over a century, yet surprisingly little is known about how the nerves are guided to their targets. The study of the development of these nerves has important implications for our understanding of craniofacial anomalies and possible treatments for both injury and genetic disorders of nerve development such as Goldenhar-Gorlin syndrome. We have discovered that retinoic acid (RA) may play a role in the development of the trigeminal nerve. Inhibition of retinoic acid receptors (RAR) results in trigeminal nerves that become unbundled or defasciculated in the eye region. To …
Analysis Of Contributing Factors To Obesity In Children And Adolescents In Southwest Georgia, Sydney Leigh Worthy
Analysis Of Contributing Factors To Obesity In Children And Adolescents In Southwest Georgia, Sydney Leigh Worthy
Theses and Dissertations
Today more than 23 million U.S. children and adolescents are either obese or overweight. Hospital costs from obesity-related diseases in youth have increased from $35 million (0.43% of total hospital costs) during 1979 to 1981 to $127 million (1.79% of total costs) during 1997 to 1999. During the Pathway to Med School program, I collaborated with three other students to develop a research project on childhood and adolescent obesity. We conducted surveys at nine different primary care clinics in the southwest Georgia area. Approval was sought by the Institutional Review Board of Phoebe Putney Memorial Health System and Albany Area …
Characterization Of Bioreducible Poly(B-Amino Ester) Nanoparticles For Sirna Delivery, Bolivia Hurtado De Mendoza
Characterization Of Bioreducible Poly(B-Amino Ester) Nanoparticles For Sirna Delivery, Bolivia Hurtado De Mendoza
Theses and Dissertations
Glioblastoma multiforme (GBM) is one of the most malignant brain tumors affecting adults. It is characterized by necrotic tissue and abnormal vasculature, making it highly resistant to current cancer treatments. A promising alternative to standard cancer therapeutics is the use of drug delivery systems such as polymeric nanoparticles (NP) that deliver silencing RNA (siRNA) exclusively to tumor cells for gene knockdown. Presently, nonviral delivery vectors, such as poly(B-amino ester) (PBAE) NP, are beneficial delivery systems because they are less immunogenic and easier to chemically modify than vectors delivered by viruses. Although current formulations of PBAEs allow cargo release via hydrolytic …
The Role Of Camk-Ii In Skeletal Muscle Function And Swimming Behavior In Zebrafish, Minh Nguyen
The Role Of Camk-Ii In Skeletal Muscle Function And Swimming Behavior In Zebrafish, Minh Nguyen
Theses and Dissertations
Previous research showed mutations in muscle sarcoplasmic reticulum-bound calcium handler proteins cause swimming defects in embryonic zebrafish. CaMK-II is a highly conserved Ca2+/calmodulin-dependent protein kinase expressed in all vertebrates has been defined to activate and inactivate multiple Ca2+ handler proteins involved in excitation- contraction coupling and relaxation of cardiac and skeletal muscle. In this study, evidence is provided through pharmacological and genetic intervention that CaMK-II inhibition and overexpression causes swimming defects, particularly response to stimuli and swimming ability, reinforced by immunolocalization of skeletal muscle. Transient CaMK-II inactivation does not have any long-term defects to swimming behavior. Overexpression of wild-type, constitutively …
Glycoconjugates Prevent Bacterial Dissemination And Cellular Death During B. Cereus/ B. Anthracis Infection, Mohamed Hassen Lahiani
Glycoconjugates Prevent Bacterial Dissemination And Cellular Death During B. Cereus/ B. Anthracis Infection, Mohamed Hassen Lahiani
Theses and Dissertations
Bacillus cereus group species including Bacillus cereus and Bacillus anthracis produce highly resistant spores. Dormant spores can survive for long period in harsh environmental conditions. Spores are engulfed by macrophages. Mammalian macrophages are the first line defenders immune cells through its phagocytic activity. Glycoconjugates (GCs) are a family of synthetic carbohydrates that possesses numerous bactericidal and immunodulatory properties. In my study, I used a multivariate approach to study the effects of GCs on B. cereus and B. anthracis Sterne phagocytosis. During in vitro study, I found that GC1 and GC3 were the best candidates that inhibited B. cereus and B. …
Mitochondrial Genetics Of Alzheimer's Disease And Aging, Perry Gene Ridge
Mitochondrial Genetics Of Alzheimer's Disease And Aging, Perry Gene Ridge
Theses and Dissertations
Mitochondria are essential cellular organelles and the location of the electron transport chain, the site of the majority of energy production in the cell. Mitochondria contain their own circular genome approximately 16,000 base pairs in length. The mitochondrial genome (mtDNA) encodes 11 protein-coding genes essential for the electron transport chain, 22 tRNA genes, and two rRNA genes. Mitochondrial malfunction occurs in many diseases, and changes in the mitochondrial genome lead to numerous disorders. Multiple mitochondrial haplotypes and sequence features are associated with Alzheimer's disease. In this dissertation we utilized TreeScanning, an evolutionary-based haplotype approach to identify haplotypes and sequence variation …
The Effect Of Thymidylate Synthase Inhibitors On Bone Marrow Derived Cells In The Intestinal Tumor Microenvironment, Grishma Acharya
The Effect Of Thymidylate Synthase Inhibitors On Bone Marrow Derived Cells In The Intestinal Tumor Microenvironment, Grishma Acharya
Theses and Dissertations
Tumors have come to be known as independently functioning complex organs consisting of cancer cells coexisting with a heterogeneous mixture of host-derived non-neoplastic cells that form the tumor stroma. Tumor survival, progression, and metastasis depend on multiple close interactions between the cancer cells and the tumor stromal cells. These tumor stromal cells are mainly bone marrow derived cells (BMDCs) that are recruited to the primary tumor and sites of metastasis by a variety of signals secreted by the cancer cells. Because of the close interaction between the tumor and the tumor stroma, we propose that tumor stromal cells play an …
Quantifying The Effects Of Antibiotics Upon Benthic Diatoms And Marine Benthic Algal Communities, Isaac M. Hagenbuch
Quantifying The Effects Of Antibiotics Upon Benthic Diatoms And Marine Benthic Algal Communities, Isaac M. Hagenbuch
Theses and Dissertations
Antibiotics are a cornerstone of modern medicine. Their ability to impair prokaryotic metabolism has saved the lives of many millions of humans in the decades since wide antibiotic usage began. Antibiotic compounds are also widely used in the husbandry of animals that are used for food but, unfortunately, much of the antibiotic mass that goes into humans and animals is excreted unchanged. Those excretions go, directly or indirectly, into aquatic ecosystems. The discovery of this fact has led to a growing global concern about the fate of antibiotics in the environment. This concern is driven by no fewer than three …
Effects Of Short-Term Dewatering On Grazer Abundance And Algal Biomass In A Wastewater Treatment Algal Turf Scrubber, Emily Husted
Effects Of Short-Term Dewatering On Grazer Abundance And Algal Biomass In A Wastewater Treatment Algal Turf Scrubber, Emily Husted
Theses and Dissertations
Finding a new, clean, and sustainable energy source to replace fossil fuels is one of society’s most daunting challenges. Algae biomass is a promising renewable resource for biofuel production due to its efficient conversion of solar energy into chemical energy. Algal turf scrubbers (ATS™) systems mimic natural streams, flowing wastewater over hard substrates designed to encourage attached algae growth. This study focuses on the use of replicated ATS™ systems, because they are low maintenance, are effective for removing nutrient pollutants, model natural stream ecosystems, and can produce large volumes of harvestable algal feedstock for biofuel production. A challenge that occurs …
A Tree Theory Case Study In Steinernema, Camille Eileen Finlinson Porter
A Tree Theory Case Study In Steinernema, Camille Eileen Finlinson Porter
Theses and Dissertations
It is widely assumed that current phylogenetic methods are fairly accurate at recovering the evolutionary relationships among different species, but evaluating the relative success of this enterprise is a difficult task. This study addresses some fundamental questions associated with generating phylogenetic trees. The complete genomes of five species of Steinernema were sequenced and assembled. Genes were predicted in AUGUSTUS and orthologous genes were found from those data using OrthoMCL. I aligned 3890 genes in MAFFT and eliminated poorly aligned positions with GBlocks. I created individual trees for each gene as well as a supermatrix tree in PAUP*, using a closely …
Characterization Of Sterile Tassel Silky Earl: A Homeotic B-Class Gene Involved In Specification Of Floral Organ Identity In Zea Mays, Steven Keith Williams
Characterization Of Sterile Tassel Silky Earl: A Homeotic B-Class Gene Involved In Specification Of Floral Organ Identity In Zea Mays, Steven Keith Williams
Theses and Dissertations
Specification of floral organ identity in angiosperm flowers is accomplished by the coordinated activity of A-, B-, C-, and E-class MADS-box genes. In the eudicots, B-class genes specify petal and stamen identity. This eudicot B-class function depends on the simultaneous expression of genes from two paralogous B-class lineages (the DEFICIENS/APETALA3 lineage and the GLOBOSA/PISTILLATA lineage). Proteins produced by genes from these two lineages interact as obligate heterodimers and together regulate the transcription of various downstream targets. These obligate heterodimers also positively regulate the transcription of the B-class genes themselves, thereby mediating a unique B-class autoregulatory feedback loop. There is compelling …
Characterization Of Microsatellite Loci And Pilot Population Genetic Analysis In Hickory Shad, Alosa Mediocris, Fnu Vishakha
Characterization Of Microsatellite Loci And Pilot Population Genetic Analysis In Hickory Shad, Alosa Mediocris, Fnu Vishakha
Theses and Dissertations
The hickory shad (Alosa mediocris) is a relatively understudied species of the anadromous fish sub-family Alosinae. This study, the first population genetic analysis of this species, employed 12 neutral microsatellite loci to estimate genetic diversity and population structure in tributaries of lower Chesapeake Bay, Virginia including James River and its tributaries (Appomattox and Chickahominy Rivers), Rappahannock River, and Pamunkey River. Genetic variation was extremely low. Estimates of observed heterozygosity were lower than expected heterozygosity. Significant population structure was detected among the six samples (FST = 0.093, p = 0.01). Effective population sizes were low (Ne ranged from 2 to 134). …
Ocean Acidification: Understanding The Coastal Carbon Pump In A High Co2 World, Rachel Cooper
Ocean Acidification: Understanding The Coastal Carbon Pump In A High Co2 World, Rachel Cooper
Theses and Dissertations
Since the 1800s, carbon dioxide emissions due to human activities have contributed significantly to the amount of carbon in the atmosphere. Approximately a third of this carbon is absorbed by the ocean, through air-sea fluxes at the ocean surface (Sabine, 2004). Increased CO2 has changed the carbon chemistry of the ocean and hence the pH. pH is expected to drop by 0.4 by the year 2100. It is unclear how this lower pH will affect carbon cycling and sequestration with respect to the biological carbon pump. Most studies have focused on open ocean phytoplankton or bacterial communities in large, stationary …
Effects Of Leaf Litter Diversity On Nutrients And Mosquito Communities In Neotropical Artificial Tree Holes, Rachel Komosinski
Effects Of Leaf Litter Diversity On Nutrients And Mosquito Communities In Neotropical Artificial Tree Holes, Rachel Komosinski
Theses and Dissertations
Inputs from terrestrial habitats to aquatic habitats are important for structuring aquatic communities. Terrestrial producer diversity in the tropics may decline due to anthropogenic causes. I investigated how tree diversity affects aquatic communities. We used leaves from three timber-producing species (Dalbergia retusa, Pachira quinata, and Tectona grandis) to test the effects of leaf litter species composition and richness on invertebrate aquatic communities in Gamboa, Panama. We quantified macroinvertbrate species richness and abundances, leaf litter mass loss, and dissolved carbon to nitrogen ratios (C:N) after 4 weeks. We found that litter types differed in breakdown and C:N. Tectona grandis had lower …
Sex-Specific Habitat Use And Responses To Fragmentation In An Endemic Chameleon Fauna, Philip Shirk
Sex-Specific Habitat Use And Responses To Fragmentation In An Endemic Chameleon Fauna, Philip Shirk
Theses and Dissertations
Chameleons are an understudied taxon facing many threats, including collection for the international pet trade and habitat loss and fragmentation. A recent field study reports a highly female-biased sex ratio in the Eastern Arc Endemic Usambara three horned chameleon, Trioceros deremensis, a large, sexually dimorphic species. This species is collected for the pet trade, and local collectors report males bring a higher price because only this sex has horns. Thus, sex ratios may vary due to differential rates of survival or harvesting. Alternatively, they may simply appear to be skewed if differences in habitat use biases detection of the sexes. …
Energetic Costs Of Thermoregulation And Population Life-History Characterization In Eastern Collared Lizards, Casey Lee Brewster
Energetic Costs Of Thermoregulation And Population Life-History Characterization In Eastern Collared Lizards, Casey Lee Brewster
Theses and Dissertations
Thermoregulation theory makes distinct predictions as to the optimal level of thermoregulation when the costs associated with the thermal habitat are less favorable. I designed a manipulative experiment to test the hypothesis that thermal constraints reduce growth rates in hatchling-collared lizards by imposing high and low cost thermoregulation treatments. Lizards thermoregulated similarly between treatments, but grew more slowly in the high cost thermoregulation treatment. My results suggest that the decrement to growth in the high cost treatment is primarily the result of energy diverted from growth to locomotion shuttling between suitable micro- habitats. I combined this experiment with a field …
Evaluating The Performance Of Computational Approaches For Identifying Critical Sites In Protein-Coding Dna Sequences, Matthew Lewis Bendall
Evaluating The Performance Of Computational Approaches For Identifying Critical Sites In Protein-Coding Dna Sequences, Matthew Lewis Bendall
Theses and Dissertations
The ability to link a particular phenotype to its causative genotype is one of the most challenging objectives for biological research. Although the genetic code provides an explicit formula for determining the sequence of amino acid phenotypes produced by a given nucleotide sequence, identifying specific residues that are functionally important remains problematic. Many computational approaches have been developed that use patterns observed in DNA sequences to identify these critical sites. However, very few research studies have used empirical data to test whether these approaches are truly able to identify sites of interest.In most empirical studies, the actual protein function and …
Foraging And Digestive Energetics In Montane And Lowland Salamanders, Cody Lund Barnes
Foraging And Digestive Energetics In Montane And Lowland Salamanders, Cody Lund Barnes
Theses and Dissertations
Thermal physiology substantially limits the distributions of organisms across landscapes. Specifically, the thermal sensitivity of foraging and digestive energetics influence the quantity of energy available for allocating to specific life functions. I hypothesized that foraging and Specific Dynamic Action (SDA) performances would differ between montane endemic and lowland salamander species. I found that foraging energetics differed between the montane endemics, Plethodon ouachitae and P. caddoensis, in comparison to the lowland P. albagula. Differences in foraging energetics were particularly pronounced at the warmest temperature and the montane endemics were more thermally sensitive, suggesting that constraints in foraging energetics influence the elevational …
Osh6 Extends Replicative Lifespan By Transporting Sterols To The Vacuolar Membrane And Promoting Vacuole Fusion, Senetibeb Gebre
Osh6 Extends Replicative Lifespan By Transporting Sterols To The Vacuolar Membrane And Promoting Vacuole Fusion, Senetibeb Gebre
Theses and Dissertations
Families of oxysterol-binding proteins (OSBP) are proposed to be involved in sterol metabolism. The unique sterol composition of eukaryotic membranes requires proteins such as OSBPs that contribute to sterol homeostasis. This thesis explores the role of Osh proteins (OSBP homologues) in membranes of yeast vacuoles in light of lifespan extension. The results show that over-expression of OSH6 promoted vacuole fusion, an ergosterol-requiring process, and extended the replicative lifespan. It is found that the level of Osh6 decreased with age. This decrease is slowed in a mutant expressing elevated OSH6 levels. It is also found that the sterol-binding domain of Osh6 …
Physiological And Morphological Variation In A Stream Salamander, Desmognathus Brimleyorum, Vanessa K Hilliard Young
Physiological And Morphological Variation In A Stream Salamander, Desmognathus Brimleyorum, Vanessa K Hilliard Young
Theses and Dissertations
Habitats vary in their biotic and abiotic components across space and time. Variability can introduce challenges for organisms unless they have the ability to alter their physiology in a way that maximizes fitness in a variable habitat. My thesis investigated the physiological and morphological responses of the stream salamander Desmignathus brimleyorum to variations in thermal and physical habitat characteristics. Chapter one concentrates on changes in metabolic response and swimming performance of salamanders exposed to differing thermal treatments and tests the predictions of the optimal acclimation theory. Chapter two investigates differences in swimming performance with respect to tail morphology, as well …
Stoneflies Of Unusual Size: Population Genetics And Systematics Within Pteronarcyidae (Plecoptera), John S. Sproul
Stoneflies Of Unusual Size: Population Genetics And Systematics Within Pteronarcyidae (Plecoptera), John S. Sproul
Theses and Dissertations
Chapter 1. The family Pteronarcyidae (Plecoptera) is a highly studied group of stoneflies and very important to a wide variety of aquatic studies. Several phylogenies have been proposed for this group recent decades, however there is little congruence between the various topologies. The present study revises the phylogeny of the group by combining molecular data from mitochondrial cytochrome oxidase subunit II, ribosomal subunit 12S, ribosomal subunit 16S, and nuclear loci ribosomal subinit 18S and Histone H3, with published morphological data in a parsimony-based total evidence analysis. The analysis produced a well-supported phylogeny with novel relationships within the genus Pteronarcys. …
Diversification And Conservation In The South American Dry Biomes: Distribution Modeling And Multilocus Lizard Phylogeography, Fernanda Werneck
Diversification And Conservation In The South American Dry Biomes: Distribution Modeling And Multilocus Lizard Phylogeography, Fernanda Werneck
Theses and Dissertations
The understanding of diversification of intraspecific lineages can shed light on speciation processes and ultimately biogeographic patterns across multiple spatial and temporal scales. In this dissertation I investigated the geographical and ecological factors promoting diversification across the South American dry diagonal biomes (i.e. Cerrado, Chaco, and Seasonally Dry Tropical Forests - SDTFs), through a coupled approach between multilocus phylogeographic and geospatial methods, in the larger context of interpreting the consequences of the resulting patterns for the conservation of biodiversity and evolutionary processes. In Chapter 1 I evaluate biogeographic hypotheses previously proposed and emphasize that the dry diagonal biomes are particularly …
The Role Of A And B Vitamins During Orofacial Development Of Xenopus Laevis, Allyson Kennedy
The Role Of A And B Vitamins During Orofacial Development Of Xenopus Laevis, Allyson Kennedy
Theses and Dissertations
Orofacial anomalies make up about a third of the 120,000 birth defects each year in the United States. Children born with these abnormalities must undergo immense physical and emotional strain in order to correct the defects. In fact, about $697 million is spent every year surgically treating children with cleft lip and/or cleft palate (2011). In countries where surgery is not an option, this abnormality causes immense difficulties in eating, hearing, speech, and psychosocial development. The causes of cleft lip/palate are extremely complex. Genetics play a role in the anomaly; however, 95% of cleft palate cases are non-syndromic and likely …
Testing Crayfish Evolutionary Hypotheses With Phylogenetic Methods, Jesse W. Breinholt
Testing Crayfish Evolutionary Hypotheses With Phylogenetic Methods, Jesse W. Breinholt
Theses and Dissertations
This dissertation focuses on increasing the understanding of the evolution processes that have contributed to the diversification of freshwater crayfish. Chapter one estimates the divergence time of the three crayfish families and tests the hypothesis that diversification is tied to the break-up of Pangaea, Gondwanna, and Laurasia. I find that the families of crayfish diverged prior to or in association with the break-up of the three super continents. Chapter two addresses the evolutionary history of the genus Cambarus, using molecular data to test hypotheses of relationships based on chela and carapace morphology. The results provide evidence that the morphology used …
Impacts Of Rdx Soil Contamination Across An Age Gradient For The Native Shrub Morella Cerifera., Stephen Via
Impacts Of Rdx Soil Contamination Across An Age Gradient For The Native Shrub Morella Cerifera., Stephen Via
Theses and Dissertations
Understanding the impacts of explosive contamination on vegetation is key to understanding explosives behavior in the environment. I quantified shrub growth responses to 1,3,5-trinitroperhydro-1,35-triazine (RDX) soil contamination across three life stages and I hypothesized that RDX would have the greatest impact on seed germination. Morella cerifera seeds were germinated on soils amended with RDX up to 1500 mg RDX kg-1 dry soil. Juvenile and adult individuals were exposed for 6 weeks to soil amended with RDX up to 750 and 1500 mg RDX kg-1 dry soil, respectively. Morphological responses were quantified for juveniles while physiological measurements were quantified for adults. …
Functional And Biochemical Consequences Of Single Nucleotide Polymorphisms In The Human Vesicular Monoamine Transporter 1 Gene (Slc18a1) By Sally Gamal Shukry, B.S., Sally Gamal Shukry
Functional And Biochemical Consequences Of Single Nucleotide Polymorphisms In The Human Vesicular Monoamine Transporter 1 Gene (Slc18a1) By Sally Gamal Shukry, B.S., Sally Gamal Shukry
Theses and Dissertations
Abstract FUNCTIONAL AND BIOCHEMICAL CONSEQUENCES OF SINGLE NUCLEOTIDE POLYMORPHISMS IN THE HUMAN VESICULAR MONOAMINE TRANSPORTER 1 GENE (SLC18A1) By Sally Gamal Shukry, B.S. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Biology at Virginia Commonwealth University. Virginia Commonwealth University, 2012 Major Advisor: Jennifer K. Stewart Associate Professor and Graduate Director, Department of Biology Single nucleotide polymorphisms (SNP) in the human VMAT1 gene (SLC18A1) have been associated with schizophrenia in three different populations: Han Chinese, Western European and Japanese. Effects of these mutations on transport function of the hVMAT1 protein have not …
Assessing The Genotoxicity Of Triclosan In Tadpoles Of The American Bullfrog, Lithobates Catesbeianus., David Emery
Assessing The Genotoxicity Of Triclosan In Tadpoles Of The American Bullfrog, Lithobates Catesbeianus., David Emery
Theses and Dissertations
Amphibians are particularly sensitive to environmental degradation and, therefore, serve as effective environmental quality indicators. Research has suggested that amphibian declines are exacerbated by manmade environmental toxicants, especially those found in high concentrations in urban areas. The NIH has pinpointed genotoxicity as a major route of cancer causation, and has since developed stringent testing procedures for potentially hazardous chemicals. One such method, recognized for its simplicity and economy, is the micronucleus assay. A study was conducted assessing the genotoxicity of the widely used antimicrobial agent Triclosan to American Bullfrog tadpoles. Lithobates catesbeianus tadpoles were reared in glass aquaria containing ultra-high …
The Phylogeography Of The Mountain Sucker [Catostomus (Pantosteus) Platyrhynchus], Nina Johanna Laitnen
The Phylogeography Of The Mountain Sucker [Catostomus (Pantosteus) Platyrhynchus], Nina Johanna Laitnen
Theses and Dissertations
Pantosteus, a subgenus of Catostomus, includes the mountain sucker (Catostomus playthyrnchus), whose speculated older origins in the Miocene/Pliocene can provide insight into the ancient geographical events of western North America. We believe that major geologic events influencing the diversification of mountain suckers include the rise of the Colorado Plateau, the connections between the ancient Snake River system and the Lahontan system and subsequently the connection of the Snake River system to the Columbia Basin, dispersal of mountain suckers across the continental divide, as well as the Pleistocene Bonneville flood. If this is true, we should see …