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 38 for “"species identity"”.
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Disturbance, Functional Diversity and Ecosystem Processes: Does Species Identity Matter?
… of ecological organization from individual species to entire landscapes. Anthropogenic disturbances from military training provide a unique opportunity to examine effects of disturbance on vegetation dynamics, physicochemical soil properties, and ecosystem processes. Additionally, plant …
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Surveying house-infesting ants after 87 years: species identity and economic impact in central Illinois
… ants in Urbana, Illinois. He reported species diversity, relative abundance, and the economic impact of control measures. I replicated this study in 2012-2013 to examine how the house-infesting ant fauna and measures used for their control have changed over this 87-year time frame. I …
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Examining the effects of seed mix diversity and composition, biochar application, seeding rate, species identity, and topography on Palouse Prairie restoration
… Seed-based restoration uses a mix of seeded species to enhance competition against weeds, diversify vegetation, and adapt to environmental conditions. However, many factors can be varied, such as seed mix diversity and composition, the proportion of forbs to grasses, and seeding rate, and the …
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Algal resource depression by macro-invertebrate herbivores in a chalk stream: An empirical approach
… interactions, or how these vary with herbivore identity, size, and biofilm physiognomy. Interactions across a diverse herbivore guild were investigated in a chalk stream, using mesocosms to determine the distribution of algal-herbivore interaction strengths. A series of experiments were used to …
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Enhancement of diversity via disturbance and seed addition in two sand prairies dominated by different grasses
… can be reduced by native and non-native dominant species, through heightened competition for resources and low colonization by non-dominant species. Traits of the dominant species may influence these interactions and also the extent to which the dominant is affected by disturbance. Disturbances …
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The influence of macrofauna on intertidal sediment stability and biogeochemical properties.
… and the abundances of three common mudflat species Hediste diversicolor, Hydrobia ulvae and Corophium volutator manipulated to examine different aspects of macrofaunal biodiversity including species identity, density, biomass distribution, and richness. An additional laboratory study enabled …
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Phylogenetic Relationships within Coleeae (Bignoniaceae Juss.)
… is represented by tribes Coleeae (4 genera/58 species) and Tecomeae (4 genera/15 species). Species of Coleeae occur in assemblages of sympatric, locally endemic species. The purpose of this study was to explore the phylogenetic relationships within Coleeae. In order to do so, techniques such as …
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Carbon Dynamics in Extracted Minerotrophic Peatlands: An Analysis of the Effect of Plant Biodiversity
… treatments planted with different numbers of species. Species richness was not found to have a significant impact on carbon sequestration and no overyielding was detected in polycultures. Species identity was important with Carex aquatilis having a significantly positive impact on carbon …
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Attracting dark-eyed fruit flies, drosophila repleta (diptera: drosophilidae), in swine facilities using color and odor
… were tested using sticky card and bottle traps. Species identity of D. repleta was confirmed using morphological characters; DNA COI sequence comparisons were inconclusive. Attraction to primary and secondary colors was tested with sticky cards in the laboratory; only primary colors were tested …
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A comparative study of vascular plants associated with Allium tribracteatum Torrey and Allium obtusum Lemmon, with special consideration of the flora of the Mehrten Formation, Tuolumne and Calaveras Counties, California
… it would be possible to separate the two species on the basis of plant associations that might be unique to each. Allium tribracteatum is restricted or nearly restricted to volcanic soils of the Mehrten Formation in Tuolumne County, California and is a species of concern to the United …
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Herbaceous and woody plant establishment across hydrologic gradients in bottomland reforestation sites
… of abiotic factors on tree and herbaceous species establishment and growth, and there is a need for improved tools for identifying critical abiotic factors during pre-restoration planning. In order to determine the effect of hydrology and other abiotic conditions on plant community …
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AN ANALYSIS OF LOBLOLLY PINE AND SHORTLEAF PINE HYBRIDIZATION USING CHROMATOGRAPHY AND GEOGRAPHIC INFORMATION SYSTEMS: A CASE STUDY IN EAST TEXAS
<p>East Texas forests contain three native pine species known to hybridize when site conditions are suitable. Due to increased gene flow from hybridization, quantifying hybridization spatially is a growing concern as southeastern United States pine forests are increasingly influenced by improved …
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Plant-Soil Feedback and Perennial Forage Systems
… practices interact to influence native species persistence is critical for sustainable perennial forage systems. I combined a multi-year field trial with a controlled greenhouse PSF experiment to evaluate how harvest frequency and community composition influence native species …
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Spontaneous Alternating Behavior in <em>Paramecium caudatum</em> and <em>Paramecium multimicronucleatum</em>
… or not SAB exists in two previously studied species of paramecia (<em>Paramecium caudatum</em> and <em>Paramecium multimicronucleatum</em>). Specifically, the study determined whether: 1) maze length or species identity influence the expression of SAB in paramecia; 2) the mechanism that …
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DNA barcoding of forensically important blow flies (Diptera: Calliphoridae) within the Western Cape of South Africa
In forensic entomology, determining species identity is a crucial step towards estimating post mortem interval. DNA barcoding can aid in the identification of unknown forensically relevant species, and this requires the comparison of DNA barcodes to reference data from known species. However, there …
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Restoring the Chocó: Growth and Survival of Native Chocoan Trees Using Different Propagation Methods
… data on the survival and growth rates of native species can contribute to the design of effective ecological restoration strategies in the region. With this objective, we evaluated the establishment capacity of 28 native species propagated from large cuttings. The results showed that survival …
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Ecotypic Variation in Johnsongrass in Its Invaded U.S. Range
… and food security. Tying invasion to species identity and associated traits has led to numerous hypotheses on why, and where, some species are invasive. In recent decades, attention to intraspecific variation among invaders has produced questions about their adaptation to climate, land …
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Studies on the life-cycle of the digenetic trematode Rhipidocotyle campanula (Dujardin, 1845) (Gasterostomata : bucephalidae) with particular reference to the larval stages
… has been experimentally demonstrated and the species identity confirmed. Sporocysts were recovered from digestive glands of the freshwater-mussel Anodonta anatina, and in heavily infected 'hosts from the reproductive, system. Both cercariae and glochidia are released simultaneously in mussels …
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Functional characterization of olfactory receptors and molecular species identification of vector mosquitoes.
… dengue, malaria, yellow fever, and Zika. Not all species of mosquitoes are responsible for vectoring these pathogens however, so accurate identification and surveillance are extremely important and directly impact human health. DNA barcoding allows for a rapid, accurate, and reliable species …
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Comparative Phylogeography of Central African Duikers Using Non-invasive Sampling Methods
… Second, since it is impossible to determine the species identity of duiker feces solely based on their morphology, a simple and reliable molecular method was needed. A tree-based approach based on ~650 base pairs of the control region amplified from reference samples was found to be the most …
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