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 43 for “"trait-variation"”.
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Intraspecific trait variation and community assembly in old-field grasslands
<p>Trait-based approaches are increasingly used in plant community ecology, but previous research has largely ignored functional trait variation within species. Here I investigated the role of intraspecific trait variation in community assembly and responses to spatial and temporal environmental …
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Spatial structuring in trait variation in Polyommatus icarus in a functional context
… with marked within and between population variation in morphology, thermal biology, and voltinism. These traits together with allozymes and a neutral DNA marker (AFLP) variation are studied here to understand how geographic trait variation is related to environmental variation. The approach …
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Interspecific wood trait variation predicts decreased carbon residence time in changing forests
… compositional shifts. While interspecific decay variation is widely reported, the implications of forest compositional change on ecosystem-level deadwood decay and consequently, the future of a globally significant C pool have not been previously explored. 2. Leveraging a 25-year treefall record …
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The use of microsatellites as a surrogate for quantitative trait variation in conservation
… biologists are interested in maintaining genetic variation in small populations, with a view to maintaining fitness and the ability of the species to adapt to changing environmental conditions. The most important type of genetic variation is therefore that which affects fitness and reproduction, …
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The Causes and Consequences of Complex Behavioral Trait Variation in a Resident Montane Bird
The causes and consequences of complex trait variation are of broad interest in the field of behavioral ecology. In the wild, animals experience wide ranging environmental conditions, and understanding the impact of this heterogeneity in shaping behavioral traits, such as cognition, is critical to …
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Establishment and trait variation of a range expanding Brassicaceae species under various growth conditions
… has been partially attributed to significant variation in several life-history traits. Some of these traits may be useful pre-adaptations, while others diverge among populations due to distinct post-introduction evolution. For example, invasive plant species are often distinguished from their …
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Hydraulic trait variation in Protea repens with change in climate in space and time
… region have increased marginally. Here I explore variation in the hydraulic traits (leaf and xylem anatomy) of Protea repens (L.) across a spatial climatic gradient in the CFR relative to a common garden experiment. I then compare the contemporary trait-climate relationships with a 21 year old …
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Using a mouse model to understand the effect of hybridization on skeletal and pelage trait variation in mammalian hybrids
… having significant differences in soft tissue trait variation. Ectodermal trait variation is of interest because primate hybrids show increased atypical non-metric dental and cranial trait variation thought to be the result of interactions between parental genomes which have diverged for …
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Population-Level Differences in Pinus monophylla Whole-Plant Seedling Strategies Under Varying Precipitation Pulses
… depends on the presence of functional traits that allow seedlings to survive selective pressures from altered climate regimes. Many widely-distributed plant species exhibit intraspecific trait variation reflecting adaptation to local environments. Populations may vary in traits that …
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From Genes to Traits and Ecosystems: Evolutionary Ecology of <i>Sphagnum</i> (Peat Moss)
… or partially decayed biomass, and the functional traits underlying this extended phenotype. Interspecific functional trait variation is hypothesized to promote niche differentiation through the creation and maintenance of ecological gradients along which species sort within communities. One …
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The rebellious mind: explaining which people become rebels
… are likely to be numerous, I focus on variation in personality traits and specifically on an individual’s level of trait aggression. I argue that personality traits are stable predictors of behavior and likely to influence joining behavior by placing personality trait variation in the …
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Evaluation of genomic prediction models that incorporates peak GWAS signals in maize and sorghum diversity panels
Some of the most important agronomic crop traits of interest are complex and thus governed by many genes of small effect. The statistical models typically used in a genome-wide association study (GWAS) and genomic selection (GS) quantify the contributions of genomic markers in linkage …
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The response of grassland carbon cycling to drought events and changes in nutrient availability
… groups, species and due to intraspecific trait variation. For soil microbial communities, the effect of drought on carbon use efficiency was modulated by short-term nutrient addition. Increased nutrient availability and drought therefore interact to determine how C is cycled and stored in …
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Constraints on the evolution of attractive traits: Natural selection, sexual selection and quantitative genetics in the zebra finch
… consequences of bill color (an attractive male trait) variation in zebra finches (Taeniopygia guttata). The primary objective of my research was to test several predictions of the good-genes and runaway sexual selection hypotheses. In a 19 month breeding experiment, I found that redder billed …
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Structure-function relationships in the water-use strategies and ecological diversity of the Bromeliaceae
… taxonomic and functional groups to elucidate how variation in leaf traits connected by structure-function relationships influences ecological differentiation among bromeliad taxa. Special emphasis was placed on hydraulic and water relations traits because of fast-paced contemporary developments in …
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Understanding the Genetic Basis of Sex Differences in Human Height
… sex chromosomes, the largest source of genetic variation in the human population, trait differences between males and females can have important implications in treatment response and disease diagnosis. Genes along the X and Y chromosomes encode broadly-expressed regulators of the transcriptome …
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Local adaptation to climate change in a calcareous grassland system
… of selection for different suites of functional traits in P. lanceolata populations exposed to chronic summer drought at BCCIL. Results suggest that avoidance strategies associated with high reproductive allocation were more common in populations exposed to long term experimental drought versus …
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Genomic and Physiological Approaches to Improve Drought Tolerance in Soybean
… drought tolerance through the identification of traits associated with drought tolerance that can be used as indirect selection criteria in a breeding program. Carbon isotope ratio (δ13C, associated with water use efficiency), oxygen isotope ratio (δ18O, associated with transpiration), canopy …
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