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.
Results
Showing 1 to 20 of 50 for “"abiotic conditions"”.
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Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions
… than the mottled morph when placed under similar conditions.
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Resident Benthic Fishes of Artificial Reefs in the Mississippi Sound: Effects of Habitat Relief and Subregion
… may have been related to prey taxa tolerance of abiotic conditions and substrate type preferences. These results suggest reef material, design and abiotic conditions relating to specific reef location may affect availability or accessibility to specific prey taxa for resident fishes, and that …
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Resource dynamics and positive and negative interactions between plants in arid systems / Jane Prider.
… Negative interactions were more intense when conditions were least productive. Positive interactions between seedlings also changed over time, depending on the facilitation mechanism. Plant interactions seem to be most intense at the beginning of interpulses when plants are competing for …
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Land use drives the physiological properties of a stream fish
… within the riparian zone can alter the abiotic properties of watersheds and stream reaches, potentially resulting in abiotic conditions that are stressful for resident fishes. The inability of fish to cope physiologically with stressful abiotic conditions can have deleterious effects on …
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Effects of intermittent irrigation on the extraction of copper from heap bioleaching systems.
… investigated and compared with the effect under abiotic conditions. As a secondary investigation, the effect of the introduction of layers of fines, which may develop during the course of the operation of heaps, on copper extraction in heap bioleaching systems was also researched.
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Relative Roles of Environmental Conditions and Riverscape Connectivity On Fish Metacommunity Structure
… This study investigates the relative roles of abiotic conditions and spatial factors in structuring stream fish communities and aims to enhance scientific understanding of these structuring factors by combining existing theory with empirical data. Fish abundance data were acquired via backpack …
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Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options
… of their detrimental effects, and the biotic and abiotic conditions associated with their nuisance growth. Eichhornia crassipes was the most problematic of the weeds, both from a human perspective and in its effect on the system, and it appears to out-compete the initially more abundant …
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Impacts of habitat management on translocation of the rare terrestrial herb Platanthera integrilabia
… indicating its ability to tolerate a range of abiotic conditions. We conducted a translocation study to determine the overall success of using tubers for translocation and to investigate how light and herbivory impact translocation emergence, survival, growth, and reproduction. Growth measures …
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Habitat Selection of Gulf-Strain Striped Bass, <i>Morone saxatilis</i>: Relationships to Dynamic Abiotic Environmental Characteristics Within the Biloxi River, Mississippi
… based on spatially and seasonally variable abiotic environmental characteristics (water temperature, dissolved oxygen (DO), salinity, specific conductivity, and pH) in the Biloxi River, MS system. Juvenile hatchery-reared and feral adult Gulf-strain Striped Bass were acoustically-tagged and …
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Biotic and Abiotic Drivers of Plant-Pollinator Interaction Rewiring
… must consider how changes to biotic and abiotic conditions are likely to affect not only the organisms present in a community but also the interactions between them.
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Interactions between habitat and ungulate herbivory limit the spread of Ipomopsis aggregata (polemoniaceae)
Both abiotic conditions and herbivores have been shown to limit the distribution of plants. This study investigates interactive effects of habitat quality and ungulate herbivory on the fitness of a monocarpic wildflower, scarlet gilia (Ipomopsis aggregata) to further elucidate reasons for its …
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Changing consumer strength in a changing climate
… at which organisms interact is affected by abiotic conditions. Ocean warming and acidification alter the metabolic demands of organisms and the strength at which they interact with each other. The metabolic costs of changing abiotic conditions vary between interacting pairs of species, and …
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Biotic and abiotic factors influencing the invasion success and ecological impacts of the Pacific oyster, Crassostrea gigas
… ecosystems are subject to a wide variety of abiotic conditions. Water motion within coastal ecosystems is a key abiotic factor controlling species abundances and biological processes yet is often not measured. Coastal ecosystems are also susceptible to invasive species due to increased …
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Herbaceous and woody plant establishment across hydrologic gradients in bottomland reforestation sites
… the site’s hydrologic regime, along with other abiotic factors including light availability and the distance from potential colonization sources. However, trees are often planted in restorations without regard to the site’s hydrologic context and do not survive. Therefore, there is a need to …
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Phenotypic characterization of rhizobia isolates and distribution of Burkholderia rhizobia in the Core Cape Subregion
… factors such as salinity and pH, and climatic conditions such as temperature. Recent studies have shown that Burkholderia form nitrogen fixing molecular associations with members of, among others, tribes Crotalarieae, Podalyrieae and Indigofereae. Selected rhizobia that included Burkholderia …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
… communities are shaped by extreme abiotic conditions, particularly low soil moisture, organic carbon availability, and high salinity. In this thesis I combine long-term ecological data with spatial habitat modeling to investigate the environmental drivers of micro-invertebrate …
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Phytoplankton Ecology in the Skidaway River Estuary
Short-term and seasonal variation in abiotic factors such as salinity, nutrient concentration, and light availability strongly influence total phytoplankton biomass but less is known about their effects on species-level changes due to difficulties associated with identifying and enumerating …
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Demographic and environmental determinants of reproductive success in Synthyris bullii, a rare endemic species
… the loss of pollinator mutualists and changing abiotic conditions may comprise the ability of plants to reproduce and maintain viable populations. My thesis research examines several aspects of the demographic and environmental factors that may influence the reproductive ecology of Synthyris …
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The influence of intraspecific variation in host plants on arthropod and fungal endophyte communities
… relative influence of host-associated variation, abiotic conditions, and interspecific microbial interactions for shaping fungal endophyte communities in spotted locoweed (Astragalus lentiginosus). Finally, in Chapter Four, I return to alfalfa to ask which plant traits affect the diversity of …
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Trace Greenhouse Gas Fluxes in Upland Forests
… aimed to determine how climatic variables, soil abiotic conditions, and tree species influence CH₄ and N₂O fluxes in forests on free-draining soil. Soil and stem CH₄ and N₂O fluxes were measured in lowland tropical rainforest in Panama, Central America and temperate woodland in the UK, using …
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