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 46 for “"fitness costs"”.
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Host recognition and fitness costs of avian brood parasitism
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Fitness costs of herbicide resistance traits in common waterhemp (Amaranthus tuberculatus)
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01
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Antibiotic Tolerance and Heteroresistance: Associated Fitness Costs and Potential in Evading Antibiotic Killing
… intriguing case by assessing the efficiency and fitness costs of horizontal transfer of fluoroquinolone resistance determinants. We hypothesized that the fitness tradeoffs incurred by resistance determinants would define the likelihood of such resistance to emerge in a clinical setting. …
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Fitness Costs of Resistance to Bacillus thuringiensis in the Pink Bollworm Pectinophora gossypiella
… cotton, Gossypium hirsutum, is associated with fitness costs in pink bollworm, Pectinophora gossypiella. Previous work has demonstrated that costs of resistance are induced by environmental factors including insecticidal cotton phytochemicals such as gossypol. This study (1) tested the …
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Inheritance and fitness costs Of field-derived resistance To Cry3Bb1 corn by western corn rootworm
… resistance is recessive and there are associated fitness costs. We characterized the inheritance of resistance of two strains of western corn rootworm with field-derived resistance to the Bt toxin Cry3Bb1 (Elma and Monona) and tested for fitness costs of resistance. The inheritance of resistance …
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Inheritance, fitness costs, and potential mechanisms of resistance for western corn rootworm larvae surviving Bt corn
… colony were utilized to determine the potential fitness costs associated with eCry3.1Ab resistance. Adult longevity, egg viability, and larval development time results indicated a lack of fitness costs associated with eCry3.1Ab resistance in the western corn rootworm. Reciprocally crossed …
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Gregarine parasitism in dragonfly populations of Central Texas with an assessment of fitness costs in Erythemis simplicicollis.
… surveyed for gregarines and an assessment of fitness costs was made in a common and widespread host species, Erythemis simplicicollis. Adult dragonfly populations were surveyed weekly at two reservoirs in close proximity to one another and at a flow-through wetland system. Gregarine …
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Evolutionary Trade-offs Between Antimicrobial Resistance and Virulence in Pseudomonas aeruginosa
… growth and virulence, indicating substantial fitness costs. PIT-resistant clones showed pronounced phenotypic heterogeneity, ranging from near–wild-type to strongly impaired phenotypes, reflecting diverse evolutionary trajectories. In contrast, STR-resistant clones largely maintained high …
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The Adaptive Function of Freudian Ambivalence, A Freudian Neo-Darwinian Synthesis
… adaptive functions: (i) to compute the inclusive fitness costs and benefits of social objects; and (ii) to regulate adaptive psychological and physiological responses to social objects.</p>
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Kinship and its consequences in the cooperatively breeding southern pied babbler Turdoides bicolor
… Of central importance to this work are the fitness costs and benefits of helping, and the factors limiting the reproduction of helpers. To understand these, the genetic relationship between individuals must be known. In this thesis, I use genetic and observational data to explore kinship …
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Field-evolved resistance to Cry3Bb1 corn by the western corn rootworm: Investigations of resistance, emergence, node-injury ratings, and fitness
… Furthermore, several researchers have described fitness costs, of western corn rootworms associated with resistance to Cry3Bb1, as being negligible. The central goal of this two-year, multi-site field experiment was to determine if field-evolved resistance to the Cry3Bb1 toxin by the western corn …
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Mechanisms Promoting Spatial and Temporal Variability in Plant Defense
… damage and goldenrod resistance, tolerance, and fitness traits, and assessed whether the spatial structure of defense was correlated with edaphic conditions and neighboring plant community. I then conducted a common garden experiment to empirically measure genetic variability of resistance and …
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Changes in Patterns of Territory and Habitat Overlap in Wood-Warblers Over Evolutionary Time
… However, ecological similarity may result in fitness costs when closely related species live together. Previous work on birds suggests that close relatives avoid each other by using different habitats. I used the radiation of Dendroica wood-warblers to test these two alternative hypotheses and …
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Understanding Host Tolerance to Transposable Elements
… in sterility. Host genomes can avoid these fitness costs of TEs either by regulating TE proliferation, or by altering gametogenesis to tolerate TE-induced DNA damage. Although TE regulation through piRNAs is studied extensively, little is known about mechanisms of gametogenic tolerance to TE …
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Evaluation of hybridization among three Laricobius species, predators of hemlock woolly adelgid, (Adelgidae)
… in a lower production of progeny as a result of fitness costs associated with interspecific mating attempts. Laricobius nigrinus and L. rubidus hybrids were produced in the lab and collected in the field. Hybrid progeny showed very little evidence of decreased fitness. For example, there was no …
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Mating costs and gametic barriers to reproduction
… and yet mating is costly. However, the fitness costs–which may immediately affect the individuals involved, or may affect their future reproductive output, are not often quantified. I assess costs that are acquired at different periods of the mating process–in search of a mate and …
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The evolutionary ecology of methylation-dependent bacterial defense systems
… demonstrate trade-offs between RM efficacy and fitness costs, as well as phage-mediated frequency dependent selection, that together provide insight into the maintenance of the high RM diversity observed in nature. Next, through experimentation we show that population-level RM diversity improves …
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Emerging Infectious Disease: Host and Parasite Perspectives
… are nearly ubiquitous parasites that can impose fitness costs of variable severity and may, in some cases, cause substantial mortality in their host populations. One example of the latter, the emergence of avian malaria in the endemic avifauna of Hawaii, has become a model for understanding the …
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Hatching synchrony and survival in early life in the painted turtle, Chrysemys picta
… time. Early-hatching individuals did not suffer fitness costs relative to their sibs at any stage considered in this study. Incubation treatment had a significant effect on migration time, but in the opposite direction that we predicted. Incubation temperature did not affect hatching success, and …
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Niche adaptations of the vibrionaceae, from the coastal ocean to the laboratory
… which anabolic ones lack, that appears to mask fitness effects; and more generally, that these habitats contain complex resources that buffer fitness costs relative to growth on single carbohydrate resources. In appendix A, I determine how environmental phage isolates recognize the Vibrio …
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