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 39 for “"migratory behavior"”.
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Migratory Behavior and Survival of Adult Female Elk in a Partially Migratory Population
<p>Within a migratory species, individuals that migrate are expected to enhance lifetime fitness through exposure to higher quality forage and avoiding predation to a greater degree than non-migratory conspecifics. Partial migration occurs when a portion of the population migrates and the other …
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Migratory Behavior and Survival of Adult Female Elk in a Partially Migratory Population
<p>Within a migratory species, individuals that migrate are expected to enhance lifetime fitness through exposure to higher quality forage and avoiding predation to a greater degree than non-migratory conspecifics. Partial migration occurs when a portion of the population migrates and the other …
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Influence of social cues on the initiation of migratory behavior in red crossbills (Loxia curvirostra)
… to difficult conditions. Photoperiod drives migratory timing in many species, but little work has focused on how social cues might fine-tune migratory timing. The goal of this study is to determine if birds use social cues from conspecifics to fine-tune the initiation of migratory behavior …
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Regional Variation in Migratory Behavior and Reproductive Output of The Gulf Of Mexico Blue Crab Spawning Stock
<p>The overarching goal of this research was to better understand the structure and boundaries of the blue crab stock(s) in the Gulf of Mexico, focusing on large-scale movements of spawning female crabs. Because spawning location is a primary determinant of larval transport pathways, understanding …
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Investigating the relationships between biotic and abiotic factors affecting migratory behavior in Westslope Cutthroat Trout within the Priest River System
… life histories, encompassing both resident and migratory behaviors. Migratory life histories play a pivotal role in maintaining metapopulations for various reasons, facilitating genetic exchange between populations and yielding larger-sized females with increased fecundity relative to residents. …
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Methods for the Comparison of Timing Behavior Applied to the Pink Salmon Fisheries of Prince William Sound, Alaska
… appropriate to the comparison of empirical migratory time densities was performed.</p> <p>The development of the measure of central tendency (mean date) of the time density as the consistent, unbiased estimator of migratory behavior was given. Practical evidence demonstrated that the mean …
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Migratory Ecology of Sea Turtles
… animals is imperative to understanding their behavior and ecology, and is often necessary for designing effective conservation-strategies. This is especially true for migratory species, such as sea turtles, whose long-distance movements form a major component of their life history. In this …
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Controlled Migration of Retinal Progenitor Cells Within Electro-Chemotactic Fields
… microfluidics device capable of examining the migratory behavior of retinal lineage cells within biomimetic geometries of the human and mouse retina. Real-time images within the device captured radial and theta cell migration in response to concentration gradients of stromal derived factor …
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The Brain Invaders: Widespread Neuronal Dispersion in Developing and Adult Mammalian Brain
… we have only limited knowledge about the migratory pathways and mechanisms utilized during brain development. In my thesis I present new and unexpected findings about neuronal migration in the developing forebrain. I analyzed and characterized a novel type of neuronal migration, so called …
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Cell Migration on Opposing Rigidity Protein Gradients: Single Cell and Co-culture Studies
… chemical. Our goal was to investigate cellular migratory behavior when cells are presented with a choice and have to choose between increasing substrate rigidity or higher protein concentration. We chose to focus on this unique environment since it recapitulates several interfacial regions in …
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Bounded population forecasts of Nye County communities generated by the cohort-component method: A mushrooming development
… western states average to account for changing migratory behavior. Under a similar assumption, fertility will be linearly trended toward national levels to account for the changing demographic characteristic of the population.
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Ecological Causes of Life History Variation Tested by Meta-analysis, Comparison, and Experimental Approaches
… <p>The relationship between provisioning behavior and offspring number was long recognized to integrate key life history tradeoffs between number and quality of offspring and between current and future reproductive success. Studies of the response of parental provisioning behavior to brood …
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Ecological Causes of Life History Variation Tested by Meta-analysis, Comparison, and Experimental Approaches
… <p>The relationship between provisioning behavior and offspring number was long recognized to integrate key life history tradeoffs between number and quality of offspring and between current and future reproductive success. Studies of the response of parental provisioning behavior to brood …
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Understanding the spring migration ecology of Sora and Virginia Rail in central Illinois: a study utiilizing automated telemetry
… wetlands. Detailed information about the spring migratory connectivity and stopover ecology of Sora and Virginia Rail is lacking. Much of the wetland habitat required by these secretive marsh birds has been lost across the Midwest over the last 200 years due to agriculture and urban development. …
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A Microsystems Approach for Drug Assessment
… with a glass wafer. Using this platform, the migratory behavior of highly metastatic breast cancer cells, MDA-MB231, is tested under different drug treatment conditions. The second platform, the off-chip passivated electrode insulator-based dielectrophoresis (OπDEP) device, has been used to …
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Interactions of Fibroblast with Cytotoxic and Invasive Strains of Pseudomonas aeruginosa on ECM Mimicking Fibers
… on quantifying changes in fibroblast morphology, migratory behavior, and force exertion to investigate this host cell's response to representative cytotoxic (PAO1) and invasive (PA14) strains of P. aeruginosa. These assays study host cell-pathogen interactions on highly aligned nanofibers of …
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Heavy Metal Distribution Across Three Georgia Estuaries Using Coastal Sharks As Sentinel Species
… where other factors, such as diet, length, and migratory behavior appear to play larger roles in the accumulation of THg within shark blood. <strong></strong></p>
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An Assessment of Sea Turtle, Marine Mammal and Seabird Bycatch in the Wider Caribbean Region
… capture (bycatch) in marine fisheries. Their migratory behavior exposes them to multiple fishing gear types and fishing practices and efforts to understand the rates of interaction between these taxa and fishing necessarily entails analysis of data over large spatial areas (ocean-basin) and …
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Optimization of fluorescence lifetime imaging microscopy (FLIM) for studying the activity of enzymes in live cancer cells
… relevant investigations. A cell’s morphology and migratory behavior can vary significantly when comparisons are made between cells cultured on two dimensional substrates and those cultured in 3-dimensional matrices. The purpose of this project was to understand the coordinated functions of MT1-MMP …
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3-D Bio-inspired Microenvironments for In Vitro Cell Migration
… on the back-side sealed with a glass wafer. The migratory behavior of highly metastatic breast cancer cells, MDA-MB-231, is tested under different drug treatment conditions. This versatile platform will enable the application of more complex fluidic circulation profile, enhanced integration with …
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