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 189 for “"Abiotic Factors"”.
-
Abiotic Factors Underlying Stress Hormone Level Variation Among Larval Amphibians
Anthropogenic disturbances can alter the abiotic composition of freshwater systems. These compositional changes can act as physiological stressors towards system inhabitants. However, little is known about how these altered abiotic factors influence stress hormones (corticosterone) in larval …
-
Investigation of Miscanthus associated microbiome: effects of biotic and abiotic factors
… structures, which rely on surrounding biotic and abiotic factors. Therefore, before Miscanthus-bacteria interactions can be optimized for better plant productivity, it is necessary to investigate the factors that regulate community assemblage of these microbes. The goal of this dissertation is to …
-
Genomic approaches to understand sweetpotato root development in relation to abiotic factors
… A secondary objective is examining the impact of abiotic stress on gene expression and storage root development. A comprehensive analysis of a high-throughput RNA sequencing data (sweetpotato root, stem, and leaf) and public Expressed Sequences Tags was done to generate a genome-wide transcriptome …
-
Assessing the Effects of Biotic and Abiotic Factors on Ephedra viridis Seed Size
… pre-dispersal and post-dispersal environmental factors affect the quality of seeds plants produce, the seeds available for dispersal, and the likelihood of seedling establishment/survivability. In this dissertation, I utilized the desert shrub Ephedra viridis to investigate three topics …
-
Investigation of Biotic and Abiotic Factors Affecting Double-Cropped Corn (Zea mays L.) Production in Virginia
… Montgomery County, Virginia from 1998 to 2000. Factors included two near-isoline hybrids (NK4640 and NK4640Bt), insecticides at planting (tefluthrin in all years, 1998-2000; and imidacloprid in 1999 and 2000), and fungicide treatments (azoxystrobin or propiconazole). Response variables included …
-
Environmental analysis of the habitat (biotic and abiotic factors) associated with Broadleaf Barbara's Buttons (Marshallia trinervia)
In June 2009 I conducted a study of the habitat associated with Broadleaf Barbara's Buttons (Marshallia trinervia) along Bird's Creek in Vernon Parish, LA. Twenty two plots were sampled for all vascular plants. Of these, 17 samples were from the area where M. trinervia was present and 5 samples …
-
The influence of drought, and other abiotic factors on tree water use in a temperate remnant forest
This thesis presents the results of work undertaken to examine daily, seasonal and annual patterns of water use by a native remnant woodland in temperate Australia. The focus of the study was on the two dominant tree species of the woodland, but limited assessments of understorey and soil …
-
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 …
-
Investigating impacts of environmental biotic and abiotic factors on the breeding habitat and diet of declining grassland birds
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
-
The effects of biotic and abiotic factors on byssogenesis, growth and movement patterns of the blue mussel, Mytilus edulis
… mussels are influenced by a host of biotic and abiotic factors. In this dissertation I quantified byssogenesis and growth of the blue mussel, Mytilus edulis, affected by wave exposure, temperature, and epibiont fouling. Byssogenesis and movement abilities of two size classes of mussels were also …
-
Functional diversity of fungal symbiont communities and the impact of biotic and abiotic factors on their composition and assembly
… understanding of the interplay of biotic and abiotic factors on communities. Hence, focusing on dominant members of the plant microbiomes, the fungal endophytes, the main goal of this research was to investigate how the ecological context affect microbial symbiont community structure and …
-
Leaf Traits, Neighbors, and Abiotic Factors: Ways That Context Can Mediate the Impact of Invasive Species on Nitrogen Cycling
… change critical ecosystem processes, factors that mediate the direction and magnitude of those impacts have received less attention. A better understanding of the factors that mediate invasion impacts on ecosystem functioning is needed in order to target which exotic species will be …
-
Biotic and Abiotic Factors of Picea rubens (Red Spruce) Seedling Regeneration in Disturbed Heathland Barrens of the Central Appalachians
… into formerly forested areas. To understand abiotic and biotic conditions guiding the advance of the red spruce stand, I conducted a broad-scale assessment of thirty-one demographics plots spread across two sites (north Cabin Mountain and Bear Rocks/Dolly Sods), and a more focused assessment …
-
Investigating the relationships between biotic and abiotic factors affecting migratory behavior in Westslope Cutthroat Trout within the Priest River System
… results suggest that there is a combination of factors that are influencing the expression of migratory life histories. Some potential ideas to investigate to better understand these factors may be observing the invertebrate communities, seasonal differences, and comparable variables in other …
-
THE EFFECT OF BIOTIC AND ABIOTIC FACTORS WITHIN THE SOIL ENVIRONMENT ON THE MORTALITY OF IXODES SCAPULARIS DURING THEIR OFF-HOST PERIODS
… spends off-host, the effects of the biotic and abiotic components of the soil ecosystem on the mortality of I. scapularis is not well-characterized. I began by exploring the effect of hot, dry weather conditions on Lyme disease incidences in geographic areas with differing endemic histories. In …
-
Functional role of root fungal communities of frailejones (Espeletiinae, Asteraceae) and their response to biotic and abiotic factors in tropical high-altitude grasslands
Los hongos de la rizosfera son actores clave en los procesos del ecosistema del suelo, ya que influyen en el ciclo de nutrientes debido a sus capacidades enzimáticas y su amplio potencial genético. Los rasgos funcionales de las plantas y las variables del suelo pueden influir directamente en las …
-
Microphytobenthos (MPB) biomass variability and sediment- water column exchanges on an intertidal flat: Influence of weather-related abiotic factors across neap-spring-neap tidal cycles
… interaction between the MPB with both biotic and abiotic factors. How much MPB are there on the sediment surfaces determines the availability of MPB biomass after immersion period and in the water column during immersion. ‘Sum of sun hours’ and ‘sum of rainfall’ directly affected the MPB biomass …
-
Catechin, a novel root exudate of Centaurea stoebe, exhibits pleiotropic effects on the soil microbial community and individual soil isolates, and undergoes chemical changes with numerous abiotic factors from soil
Allelopathy has been studied for (±)-catechin, a root exudate of spotted knapweed, as a plausible mechanism that facilitates knapweed invasion in North America. Phytotoxic effects are observed in invaded fields as well as greenhouse experiments when employing catechin or growing spotted knapweed, …
-
Catechin, a novel root exudate of Centaurea stoebe, exhibits pleiotropic effects on the soil microbial community and individual soil isolates, and undergoes chemical changes with numerous abiotic factors from soil
Allelopathy has been studied for (±)-catechin, a root exudate of spotted knapweed, as a plausible mechanism that facilitates knapweed invasion in North America. Phytotoxic effects are observed in invaded fields as well as greenhouse experiments when employing catechin or growing spotted knapweed, …
Page 1 of 10