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 92 for “"Environmental variability"”.
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Environmental Variability and Phenotypic Flexibility in Plants (Illinois)
… that have evolved in habitats with greater environmental variability will possess a greater ability to respond phenotypically to this variability than genotypes within species or populations that have evolved in habitats with less environmental variability. The phenotypic response quantified …
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The Impact of Environmental Variability on Perceptions of Parental Ability From Bodily Cues
<p>This study aimed to extend work considering how bodily cues appear diagnostic of parental ability. I examined body adiposity and sexually dimorphic features for women (i.e., breast size) and men (i.e., muscularity). I further considered how salience of resource scarcity might heighten …
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Holocene climate and environmental variability in NE Germany inferred from annually laminated lake sediments
Understanding the role of natural climate variability under the pressure of human induced changes of climate and landscapes, is crucial to improve future projections and adaption strategies. This doctoral thesis aims to reconstruct Holocene climate and environmental changes in NE Germany based on …
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A late-Quaternary record of environmental variability from lake sediment cores, Wind River Range, Wyoming
1 PDF file (viii, 227 pages)
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Wintering Reddish Egret (Egretta Rufescens) Foraging Response To Environmental Variability On The Southern Texas Gulf Coast
… effect models of my count data and multiple environmental variables, I found increasing wind speed and an easterly wind direction had negative effect on the presence of foraging Reddish Egrets in the study area, while a westerly wind direction had a positive effect, suggesting that wind …
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Seasonal and spatial variability of pelagic fishes in relation to environmental variability in St Helena Bay
… Africa. It is an extensive long term project on environmental monitoring, running from 2000 till 2012 on an almost monthly basis but currently running on a quarterly basis. It extends through the nursery grounds and part of the transport zone for hydrology and productivity in areas that are …
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The Role of Climatic and Environmental Variability on West Nile Virus in Harris County, Texas, 2006-2007
… to determine the extent to which climatic variability between the two years played a role. The Mosquito Control Division of Harris County Public Health and Environmental Services gathered the data on vectors and reservoirs. Then using GIS, spatial analysis, and geostatistical tools the …
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Not Too Hot, Not Too Cold, But Moderately Variable: The Influence of Environmental Variability on Coral Thermal Tolerance
… from a Moderately Variable (MV) and a Low Variability (LV) pool transplanted into a Highly Variable (HV) pool on Ofu Island in American Samoa. Paired transplant and native ramets were exposed to an acute thermal stress every six months (for 1.5 yrs) to evaluate changes in thermal tolerance. …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use By Fish in the Vermillion River, South Dakota
This study was initiated to 1) examine the associations of fish with meso- and microhabitat in the Vermillion River, South Dakota, and 2) quantify fish communities in Vermillion River tributaries. Fish were collected from four mesohabitats (riffles, pools, runs, stream areas with woody debris) in …
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The Influence of Habitat Structure and Environmental Variability on Habitat Use by Fish in the Vermillion River, South Dakota
This study was initiated to 1) examine the associations of fish with meso- and microhabitat in the Vermillion River, South Dakota, and 2) quantify fish communities in Vermillion River tributaries. Fish were collected from four mesohabitats (riffles, pools, runs, stream areas with woody debris) in …
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Influence of Natural and Anthropogenic Environmental Variability on Larval Fish Diet, Growth, and Condition in the Northcentral Gulf of Mexico
… stages of fishes are especially vulnerable to environmental variability created by freshwater discharge. The objectives of this study were to describe the available prey field, diet, growth and condition of larval fishes with respect to various effects of freshwater discharge in the northern …
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The Effects of Environmental Variability on the Population Structure of the Eastern Oyster (<i>Crassostrea virginica</i>): A Modeling Study
… coupled to investigate the effects of changes in environmental conditions on the population structure of the Eastern oyster, Crassostrea virginica. The first model, a time-dependent model of the oyster population as described in Powell et al. (1992) and Hofmann et al. (1992, 1995), tracks the …
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Toward a contingency model of organizational commitment
… between organizational commitment and environmental variability. In an in-depth survey of 65 nurses, three types of organizational commitment-- attitudinal, calculative, and integrative-- are measured. Subsequently, each of these three types is correlated to environmental variability. …
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Population and evolutionary dynamics during microbial range expansions
… expansions are becoming more frequent due to environmental changes and rare long distance dispersal, often facilitated by anthropogenic activities. Simple models in theoretical ecology explain many emergent properties of range expansions, such as a constant expansion velocity, in terms of …
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Ocean acoustic applications of an autonomous underwater vehicle at the New England Shelfbreak
… for studying these oceanographic processes, as environmental variability greatly influences acoustic propagation and scattering. The work in this dissertation follows an interdisciplinary approach to explore the multifaceted connections between acoustics and different branches of oceanography. …
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Rethinking the aceramic neolithic: Insights from an ethnoarchaeological study on Cyprus
… strategies are in fact effective responses to environmental variability. The discussion of conceptual frameworks regarding economic uncertainty are considered relevant for rethinking the so-called bizarre Aceramic Neolithic on Cyprus.
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Variability within the 10-year pollen rain of a seasonal neotropical forest
The effect of seasonal and multiannual environmental variability on the abundance and composition of Neotropical pollen rain was investigated using ten years of seasonal aerial pollen samples from Barro Colorado Island (BCI), Panama. Using canonical correspondence analysis, we identified the …
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The physiological ecology of the specialist lagoon amphipod, Gammarus insensibilis
… the majority of samples were taken, demonstrated environmental variability characteristic of coastal lagoons. Annually, temperature varied between 2 and 28 °C and salinity fluctuated between extremes of 24 and 39. The Lymington-Keyhaven lagoons, also on the south coast of England, demonstrated …
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Toward Real-Time Planning for Robotic Search
… time or distance constraint, and that the local environmental conditions affect sensor performance. Because the environment varies by location, the effectiveness of the search sensor also varies by location. Our contribution to search theory includes new decision-theoretic approaches for …
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