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Conceptual Change: The Integration Of Geologic Time Into The Teaching Of Evolution, David L. Ramseyer

Theses and Dissertations

This study attempts to discern if geologic time is a threshold concept for student understanding of evolutionary theory. A threshold concept enables the learner to unpack other concepts because of its importance in thought construction. In this study three teachers and ten sections of biology were investigated from the same high school. Each teacher used the same activities, in the same sequence, and with identical evaluation methods. Students in the treatment group covered a unit on geologic time prior to completing course work on evolutionary theory. Student misconceptions in both control and treatment groups were assessed using a composite concept …

The Use Of Mathematical And Computational Models To Define The Role Of Mutation And Infection In Colorectal Cancer., Chandler D. Gatenbee 1982-

Electronic Theses and Dissertations

Research over the past twenty five years has led to the development of the hypothesis that colorectal cancer is caused by the accumulation of mutations in tumor suppressor genes and proto-oncogenes. The last ten years has also revealed that the common JC Virus (JCV) is frequently found in colorectal tumors. This has led to the hypothesis that the virus, which is known to cause tumors in the lab, may playa role in colorectal cancer. However, the presence of JCV in colorectal tumors does not necessarily indicate a cause-effect relationship. Unlike in vivo and in vitro studies, mathematical and computational modeling …

Attitudes Toward Science And Stem Cell Research Based On Religious Worldview: Comparing The Views Of Theists, Naturalists, Skeptics, And Dualists Toward Science As An Institution, Method, And Application Of Knowledge, Jon Van Wieren

Dissertations

This dissertation is a study of attitudes toward science and stem cell research based on religious worldview. This study examines the relationship through General Social Survey data (2006).

Religious worldview is measured here through some of the most common measures of religiosity. This study differs from many other sociological studies of religiosity in that it includes the view of naturalism alongside other religious worldviews, including theism, dualism, and skepticism. Science is understood and measured here as multidimensional. Comparisons are made between attitudes toward science as a social institution, a research method, and as an application of knowledge - where attitudes …

Math, Minds, Machines, Christopher V. Carlile

Chancellor’s Honors Program Projects

No abstract provided.

Insights Into The Taxonomy And Evolution Within An Orchid, Platanthera Dilatata, Based On Orphometrics And Molecular Markers, Binaya Adhikari

Theses and Dissertations

Documenting biodiversity, at and below the species level, is a persistently challenging task for biologists. Poor understanding of biodiversity may lead to incorrect interpretations of observed variation. The underlying basis of variation can be understood by quantifying multiple sources of information. Nine morphometric characters and plastid DNA sequences (2511 bps) were quantified in a highly variable orchid species, Platanthera dilatata, to evaluate taxonomy of the three named varieties and to understand patterns of evolution. Three morphological groups, identified in a cluster analysis, were distinct in multiple floral traits. Additionally, the three clusters were consistently genetically divergent as indicated by infrequent …

A Comparative Analysis Of The Neural Basis For Dorsal-Ventral Swimming In The Nudipleura, Joshua L. Lillvis

Biology Dissertations

Despite having similar brains, related species can display divergent behaviors. Investigating the neural basis of such behavioral divergence can elucidate the neural mechanisms that allow behavioral change and identify neural mechanisms that influence the evolution of behavior.

Fewer than three percent of Nudipleura (Mollusca, Opisthobranchia, Gastropoda) species have been documented to swim. However, Tritonia diomedea and Pleurobranchaea californica express analogous, independently evolved swim behaviors consisting of rhythmic, alternating dorsal and ventral flexions. The Tritonia and Pleurobranchaea swims are produced by central pattern generator (CPG) circuits containing homologous neurons named DSI and C2. Homologues of DSI have been identified throughout the …

Evolution Of Ethics In The Island Of Doctor Moreau And Heart Of Darkness, Christine D. Anlicker

English Theses

This thesis analyzes H. G. Wells’s The Island of Doctor Moreau and Joseph Conrad’s Heart of Darkness within the context of nineteenth-century evolutionary theory. I explore how Charles Darwin and Thomas Huxley used evolution by natural selection to develop differing explanations of the origins of ethics and how this impacted the place each scientist gave morality in civilization. By exploring how Huxley and Darwin understood morality to derive from the phenomena of sympathy and restrain, I illustrate how Wells’s and Conrad’s novellas interrogate these discourses of altruism.

Investigating Speech Perception In Evolutionary Perspective: Comparisons Of Chimpanzee (Pan Troglodytes) And Human Capabilities, Lisa A. Heimbauer

Psychology Dissertations

There has been much discussion regarding whether the capability to perceive speech is uniquely human. The “Speech is Special” (SiS) view proposes that humans possess a specialized cognitive module for speech perception (Mann & Liberman, 1983). In contrast, the “Auditory Hypothesis” (Kuhl, 1988) suggests spoken-language evolution took advantage of existing auditory-system capabilities. In support of the Auditory Hypothesis, there is evidence that Panzee, a language-trained chimpanzee (Pan troglodytes), perceives speech in synthetic “sine-wave” and “noise-vocoded” forms (Heimbauer, Beran, & Owren, 2011). Human comprehension of these altered forms of speech has been cited as evidence for specialized cognitive capabilities …

Classification Of Phase Transition Behavior In A Model Of Evolutionary Dynamics, Dawn Michelle King

Theses

Amongst the scientific community, there is consensus that evolution has occurred; however, there is much disagreement about how evolution happens. In particular, how do we explain biodiversity and the speciation process? Computational models aid in this study, for they allow us to observe a speciation process within time scales we would not otherwise be able to observe in our lifetime. Previous work has shown phase transition behavior in an assortative mating model as the control parameter of maximum mutation size (µ) is varied. This behavior has been shown to exist on landscapes with variable fitness (Dees and Bahar, 2010), and …

Evolutionary Fabrication: An Autonomous System Of Invention, Tim Kuehn

Honors Theses

Evolutionary algorithms have had success in designing complex objects, ranging from antennae used in NASA's Space Technology 5 mission to astronomical telescope lenses. However, evolutionary design is limited by the ability of a simulation to accurately represent the physical world. Addition-ally, evolved designs may be well described, but they carry no set of speci˝c instructions describing how to physically create such a design. Evolutionary Fabrication (EvoFab) recti˝es this: EvoFab is a machine built upon a process that can, in principle, automatically invent and build anything, from soft robots to new toys, by evolving the process, not the product. We have …

Religiosity, Knowledge Of Evolution, And Political Ideology As Predictors Of Attitudes Towards The Evolution V. Creationism Controversy, Nikolaus Philip Schuetz

Theses (6 month embargo)

Since Darwin On the Origin of Species over 150 years ago, evolution via natural selection has gained essentially unilateral support among scientists, with 97% of scientists agree that life evolved over time, while a mere 12% to 29% of the general public accepts evolution via natural selection. About three-quarters of the public support teaching creationism in public school science classes--a violation of the First Amendment--and a recent survey shows that just 28% of high school biology teachers advocating for evolution in their classroom, as per the national guidelines.

The present study aims to investigate and clarify certain relationships that lead …

Mechanisms Of Early Brain Morphogenesis, Benjamen Filas

All Theses and Dissertations (ETDs)

In structures with obvious mechanical function, like the heart and bone, the relationship of mechanical forces to growth and development has been well studied. In contrast, other than the problem of neurulation: formation of the neural tube), developmental mechanisms in the nervous system have received relatively little attention. The central aim of this research is to characterize the biophysical mechanisms that shape the early embryonic brain. Experiments were performed primarily in the chicken brain, which is morphologically similar to humans during early stages of development. Proposed mechanisms were tested using computational models to ensure that hypotheses are consistent with physical …

Evolution And Biogeography Of Fire-Eye Antbirds (Genus Pyriglena): Insights From Molecules And Songs, Marcos Maldonado Coelho

Dissertations

The importance of climatic and geologic factors as drivers of population differentiation and speciation in the Neotropical region has long been appreciated. However, many questions remain regarding their roles underlying the processes and patterns of diversification. Studies conducted in distinct regions containing a suite of geological and ecological conditions constitute ideal scenarios to assess the role of Pleistocene climatic changes, rivers, and mountain building as historical diversification mechanisms. In chapters 1 and 2, I used an integrative approach combining molecular phylogenetics, phylogeography and population genetics to elucidate the importance of climatic and geological factors as engines of diversification. I focused …

The Emergence Of Language As A Function Of Brain-Hemispheric Feedback, Eric Alexander La Freniere

Masters Theses, 2010-2019

This text posits the emergence of language as a function of brain-hemispheric feedback, where “emergence” refers to the generation of complex patterns from relatively simple interactions, “language” refers to an abstraction-based and representational-recombinatorial-recursive mapping-signaling system, “function” refers to an input-output relationship described by fractal algorithms, “brain-hemispheric” refers to complementary (approach-abstraction / avoidance-gestalt) cognitive modules, and “feedback” refers to self-regulation driven by neural inhibition and recruitment. The origin of language marks the dawn of human self-awareness and culture, and is thus a matter of fundamental and cross-disciplinary interest. This text is a synthesized research essay that constructs its argument by drawing …

Gender Differences In Autonomic Nervous System Reactivity To Stress, Brittany Verret

Senior Honors Theses

The purpose of this study was to disentangle the psychobiological mechanisms and social-evaluative conditions that mediate the process by which the Autonomic Nervous System reacts in male and female humans. We used the original Trier Social Stress Test, as well as two modifications to this original social stressor: a punishment modification and a reward modification. We obtained measures of autonomic (heart rate and respiratory sinus arrhythmia; HR and SA respectively) reactivity before, during and after the stress test. To distinguish the contribution of the different modifications and any additional difference in reactivity due to gender, the participants were randomly separated …

Home Field Advantage: Sprint Sensitivity To Ecologically Relevant Substrates In Lizards, Clint Edward Collins

Electronic Theses and Dissertations

Effectively moving across variable substrates is important to all terrestrial animals. Much attention has been given to the effects of different substrates on locomotor performance in an attempt to link ecology and morphology. Sprint sensitivity is the decrease in sprint speed due to change in substrate. This study measures sprint sensitivity to substrate rugosity among six lizard species that occupy rocky, sandy, and/or semi-arboreal habitats. Lizards that use rocky habitats are less sensitive to changes in substrate rugosity, followed by arboreal lizards, and then by lizards that use sandy habitats. Phylogenetic analysis suggests that using rocks is highly correlated with …

Variation And Organization In Social Behavior : Infectious Disease And Human Intergroup Conflict And Warfare; And The Organization Of Foraging Behavior In Harvester Ants, Kenneth Letendre

Biology ETDs

Social behavior is an important contributor to the success of widely distributed animal taxa, including such distantly related taxa as humans and ants. There is variation in the features and organization of social systems based on ecological constraints and goals, as these alter the costs and benefits of social behaviors, and select for different optimal behaviors for social groups in different environments. I present two bodies of research: an effort to explain geographic variation in the frequency and intensity of human civil conflict; and an effort to describe and model the foraging behavior of colonies of harvester ants of the …

Strangers With Benefits: Ovulation And Attraction To Outgroup Men, Joseph Frederick Salvatore

Masters Theses

The tendency for humans to behaviorally and attitudinally favor ingroups over outgroups is robust and pancultural. An evolutionary framework, however, provides reason to expect a systematic tendency toward outgroup-favoritism in a particular context. Ancestral females may have mated furtively with outgroup-males and returned to their cuckolded ingroup-male partner for child rearing, as a means of both maximizing genetic variability and promoting the long-term welfare of an offspring. The footprint of such a process may evidence in human females via increased physical attraction to outgroup (but not ingroup) males as ovulation approaches (conception-risk increases). Two studies of normally ovulating women tested …

Paleobiological Assessment Of Controls Underlying Long-Term Diversity Dynamics, Andrés L. Cárdenas

USF Tampa Graduate Theses and Dissertations

Deciphering the factors underlying both long-term patterns of diversity and taxonomic turnover rates (i.e., extinction, and origination) has been one of Paleobiology's major foci for the past three decades. The importance of documenting these components is that they will expand our ability to interpret and model the evolutionary processes underlying those trends, highlight the evolutionary impact of historical events, and contribute to the formulation of robust predictions about the future of global diversity in response to the current anthropologically driven environmental changes. Accordingly, the first part of this study examines the possible occurrence of global marine evolutionary environmental controls into …

Adenine Uracil Guanine: An Exploration Of Certainty In Science, Alicia M. Hendrix

Scripps Senior Theses

Collaboration and communication between conventionally diverse fields can allow for deeper understanding and clearer analysis of the concepts within each. Two fields traditionally seen as dichotomous are those of art and science. Historically they approach problems in opposite ways. However, I would argue that they in fact investigate very similar questions, hoping to discover the ways that the world works. It makes sense, then, that historically these fields have sometimes been able to interact. Artists have engaged with science by creating work through scientific processes including crossbreeding flowers, genetically modifying organisms, and sequencing nucleotides. Others have referenced scientific ideas, like …

Interplay Between Competition And Evolution In Invaded And Native Plant Communities, Daniel Atwater

Graduate Student Theses, Dissertations, & Professional Papers

The distributions and abundances of organisms are affected by ecological processes, such as competition, predation, and abiotic stress, and these processes can also produce rapid evolutionary change in plant communities. Although our understanding of ecological and evolutionary interactions is growing, so far little is known about how competition among plants interacts with evolution to shape communities. In my dissertation, I use species invasions to investigate the evolutionary and ecological consequences of plant interactions and their effects on plant community assembly.

In my first chapter, I investigated complex ecological interactions between Euphorbia esula, an invasive plant, and Balsamorrhiza sagittata, a native …

Evolution Through The Search For Novelty, Joel Lehman

Electronic Theses and Dissertations

I present a new approach to evolutionary search called novelty search, wherein only behavioral novelty is rewarded, thereby abstracting evolution as a search for novel forms. This new approach contrasts with the traditional approach of rewarding progress towards the objective through an objective function. Although they are designed to light a path to the objective, objective functions can instead deceive search into converging to dead ends called local optima. As a significant problem in evolutionary computation, deception has inspired many techniques designed to mitigate it. However, nearly all such methods are still ultimately susceptible to deceptive local optima because they …

Speciation In Ancient Lakes: Insights From The Copepods Of Sulawesi, James Joseph Vaillant

Electronic Theses and Dissertations

One of the fundamental questions in biology is the origin of species. Considerable insights into the processes that drive speciation have come from ancient lake systems. In this thesis, I present insights into speciation processes by investigating the species radiations of the ancient Malili Lakes of Sulawesi, Indonesia. The nature of adaptive radiations in the lakes suggests that intraspecific competition for extremely limited resources has driven taxa to adapt to specific habitats and food sources. The copepod populations of Sulawesi reveal that colonization order governs the geographic distribution of zooplankton in freshwater ecosystems. In many Malili Lakes taxa, hybridization between …

Placing Birds On A Dynamic Evolutionary Map: Using Digital Tools To Update The Evolutionary Metaphor Of The "Tree Of Life", Sonia Stephens

Electronic Theses and Dissertations

This dissertation describes and presents a new type of interactive visualization for communicating about evolutionary biology, the dynamic evolutionary map. This web-based tool utilizes a novel map-based metaphor to visualize evolution, rather than the traditional "tree of life." The dissertation begins with an analysis of the conceptual affordances of the traditional tree of life as the dominant metaphor for evolution. Next, theories from digital media, visualization, and cognitive science research are synthesized to support the assertion that digital media tools can extend the types of visual metaphors we use in science communication in order to overcome conceptual limitations of traditional …

Ecological Causes Of Life History Variation Tested By Meta-Analysis, Comparison, And Experimental Approaches, Daniel Croft Barton

Graduate Student Theses, Dissertations, & Professional Papers

The ecological causes of life history variation among taxa and the arrangement of such variation along geographic gradients is enigmatic despite the proximity of life history traits to fitness and implications for understanding basic and applied population ecology. One classic explanation for the arrangement of avian life histories along a `slow-fast' gradient, where species at low latitudes have `slow' life history traits (low fecundity and mortality) and species at high latitudes have `fast' life history traits (high fecundity and mortality), is the increase in seasonality of resources with increasing latitude (Ashmole's hypothesis). Despite broad acceptance, this hypothesis has been supported …

Intra And Interhost Dynamics Shaping Arbovirus Adaptation And Evolution, Alexander T. Ciota

Legacy Theses & Dissertations (2009 - 2024)

Arthropod-borne viruses (arboviruses), which are predominately mosquito-borne and almost exclusively RNA viruses, are maintained in nature in complex transmission cycles involving blood sucking invertebrates and vertebrate hosts. Although over 120 arboviruses are human pathogens responsible for causing a significant and expanding global health burden, a detailed understanding of the complex interactions between these pathogens and their hosts, particularly invertebrate hosts, is lacking. Defining these interactions is necessary if we are to understand the selective pressures and, therefore, evolutionary, adaptive, and epidemiological potential of arboviruses. This requires experimental infection and evolution studies, particularly in vivo, with natural hosts. The results presented …

Phenotypic And Niche Evolution In The Antbirds (Aves: Thamnophilidae), Gustavo Adolfo Bravo

LSU Doctoral Dissertations

A pervasive goal in evolutionary biology has been to address why some clades are richer in species or phenotypic diversity than others. The Thamnophilidae is a large family of insectivorous passerine birds that provides great opportunities to study variation in species and phenotypic diversity. It comprises ca. 220 species that are mostly restricted to the lowlands and lower montane forests of the Neotropics. Its species are diverse in body size and shape, and the family exhibits high species richness, especially in Amazonian forests, where as many as 40 species may co-occur. Therefore, the fundamental research goal of my dissertation is …

Compressed Air Foam Fire Grounds Evolution Tests, Justin A. Lapolla, Alexander L. Morano, Vincent P. Luchsinger

Mechanical Engineering

Compressed air foam firefighting technology has been purchased by a number of urban fire departments in the United States. These departments have curtailed their use of these systems until potential safety hazards associated with the use of compressed air foam systems in interior structure fires are evaluated. This project is part of a greater effort to evaluate the efficacy and practicality of compressed air foam systems for use in structural firefighting. This project focused on developing test apparatuses and test methods for measuring the following safety-related parameters: 1.) nozzle reaction force of a fire nozzle, 2.) the force required to …

Socioscientific Issues: A Path Towards Advanced Scientificliteracy And Improved Conceptual Understanding Of Socially Controversial Scientific Theories, Dean William Pinzino

USF Tampa Graduate Theses and Dissertations

Abstract

This thesis investigates the use of socioscientific issues (SSI) in the high school science classroom as an introduction to argumentation and socioscientific reasoning, with the goal of improving students' scientific literacy (SL). Current research is reviewed that supports the likelihood of students developing a greater conceptual understanding of scientific theories as well as a deeper understanding of the nature of science (NOS), through participation in informal and formal forms of argumentation in the context of SSI. Significant gains in such understanding may improve a student's ability to recognize the rigor, legitimacy, and veracity of scientific claims and better discern …

Analysis Of A Wound-Induced Gene Family In Glycine Max, Gena Robertson

Masters Theses

Gene families in plants are important in understanding genome evolution indicating when and where genome duplications and segmental duplications occurred as well as subsequent divergence and subfunctionalization. A gene family in Glycine max that encodes a WI12 protein, wound-induced protein, was found to consist of ten genes on five chromosomes. Wound-induced proteins are activated in response to wounding in plants, and the WI12 protein in particular is thought to be involved in cell wall modifications at the wound site. A variety of bioinformatics tools have been used to analyze the expansion of this family in soybean as well as identify …