Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"thermal-tolerance"”.
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Improving the thermal tolerance of photosynthesis in wheat
… low temperature optimum; improving its thermal tolerance would maintain Rubisco activity and enhance photosynthesis at higher temperatures, with predicted positive impacts on grain yields under moderate heat stress. Two approaches were taken to improve the thermal tolerance of Rca in …
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Hypoxia and thermal tolerance in New Zealand triplefin fishes
… O₂ tension (Pcrit) - a measure of hypoxia tolerance - was compared between two intertidal and two subtidal triplefin fishes endemic to New Zealand. The intertidal species had a lower Pcrit than the subtidal species indicating adaptations to meet O₂ demands of maintenance metabolism at lower …
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The influence of environmental temperature on the thermal tolerance of Antarctic notothenioid fishes
… Ocean has resulted in a remarkably narrow thermal tolerance shared among most extant species. While most of these fishes have the capacity to accommodate the physiological challenges of low temperature, they show a greatly reduced tolerance to heat relative to fishes native to warmer …
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Thermal Tolerance of Age-0 Gulf of Mexico Striped Bass (<i>Morone saxatilis</i>): Ontogenetic and Genetic Effects
… there is no evidence of natural reproduction. Intolerance of striped bass to high water temperature is a potential factor negatively impacting Gulf striped bass survival and reproductive fitness, and may be a limiting factor to reintroduction of the species in Mississippi. This work contributed …
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Not Too Hot, Not Too Cold, But Moderately Variable: The Influence of Environmental Variability on Coral Thermal Tolerance
… these variable reef sites can increase their thermal tolerance, providing promising evidence for the ability of corals to cope with rapid climate change. This dissertation investigates the physiological and genetic response of two massive corals,<em> Porites lobata</em> and <em>Goniastrea …
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Assessing the Thermal Tolerance and Growth Potential at Elevated Temperatures of Three Different Strains of Rainbow Trout (Oncorhynchus mykiss)
This thesis examines how critical thermal maxima (CTM) differs between different strains of rainbow trout (Oncorhynchus mykiss) and explores the relationship between thermal tolerance and consumption, conversion efficiency, and growth rates at elevated temperatures. This thesis is comprised of …
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Environmental Factors Associated With Long-Term Trends of Mountain Sucker Populations in the Black Hills, and and Assessment of Their Thermal Tolerance
… of mountain sucker, and 3) assess their thermal tolerance. I analyzed stream fisheries survey data collected between 1960 and 2010 and found that mountain sucker density generally declined at three nested spatial scales: sample reach, stream, and watershed. At 14 sample reaches and two …
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Effects of Hyperoxia on Thermal Tolerance and Indicators of Hypoxic Stress in Antarctic Fishes That Differ in Expression of Oxygen-Binding Proteins
… have shown that icefishes have lower critical thermal maxima (CT<sub>MAX</sub>) than red-blooded notothenioids and that there is a positive correlation between CT<sub>MAX</sub> and hematocrit, indicating that oxygen-carrying capacity may contribute to thermal tolerance. I tested the hypothesis …
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Latitudinal Variation in Thermal Tolerance and Preference of <i>Fundulus notatus</i> and <i>F. olivaceus</i>: Implications for Temperature Mediated Reproductive Isolation
… range, these populations inhabit a wide range of thermal regimes, thus having to locally adapt to their surrounding thermal environments. Variable temperature regimes along latitudinal gradients might be responsible for adaptive differences in thermal biologies among populations. I examined …
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Tolerating climate change: a study on the influence of thermal history on thermal tolerance of Galaxias zebratus in rivers of the Cape Peninsula, South Africa
… fish, like G. zebratus, may be sensitive to the thermal regime of their environment and may thus be influenced by climate warming. The most commonly used experimental approach for determining the effect of elevated temperature on freshwater biota is the Critical Thermal Method (CTM). The CTM …
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The Thermal Ecology of Sceloporus occidentalis
… Studies have historically looked at thermal tolerance values to establish predictive models for population and species extinctions.</p> <p>In chapter 1, we looked at recent studies that suggest that thermal tolerance may be a plastic trait and test the effects empirically. Most …
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In Hot Water: Thermal Acclimation is Insufficient to Save Corals in the Anthropocene
… very symbioses that have enabled coral survival. Thermal stress causes a reduction of algal symbionts, a phenomenon referred to as ‘coral bleaching’ that represents dysbiosis in the holobiont and often leads to mortality. Current thermal acclimation theory states variation and gradual increases in …
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Ecological consequences of genetically-based thermal traits in fishes
… persistence dependent on resiliency in thermal physiology and thermoregulation. The association between thermal physiology and behavioural traits can predict population persistence, range shifts, and evolution in the face of contemporary climate change, but the mechanisms underlying …
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Genomic and physiological adaptation to temperature in the invasive golden star runicate (Botryllus schlosseri)
… to study how a pernicious NIS adapts its thermal physiology on contemporary time scales. In Chapter 2, I applied low-coverage whole genome sequencing (lcWGS) to investigate patterns of population genetic structure and signatures of local adaptation to temperature. In addition to …
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Genomic and physiological adaptation to temperature in the invasive golden star tunicate (Botryllus schlosseri)
… to study how a pernicious NIS adapts its thermal physiology on contemporary time scales. In Chapter 2, I applied low-coverage whole genome sequencing (lcWGS) to investigate patterns of population genetic structure and signatures of local adaptation to temperature. In addition to …
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Genome-wide Analyses of Recombination and the Genetic Architecture of Virulence Traits in Cryptococcus
… virulent. A wide variety of traits, such as thermal tolerance, melanin production, and an extracellular capsule contribute to virulence, yet our understanding of the genetic architecture of such traits is limited. In the studies reported here, I describe the first genome-wide analyses of …
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Genetic connectivity, adaptation, and phenotypic plasticity of corals and anemones under thermal stress
… In this context, I explore three case studies of thermal stress in corals and anemones. I begin with massive Porites lobata corals from the central Pacific. Here, reefs that are most affected by El Niño, such as Jarvis and the northeast Phoenix Islands maintain genetic diversity indicating …
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The thermal macrophysiology of core and marginal populations of the aphid Myzus persicae in Europe
… Sweden, UK and Spain. Indices of temperature tolerance (upper and lower lethal temperature50, coma temperatures and mobility thresholds) were determined for each aphid clone at different rearing temperatures. Acclimation at 10°C for one generation increased cold tolerance by depressing lower …
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