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 25 for “"Invasive Grass"”.
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Germination niche of an emergent invasive grass, Arthraxon hispidus
Joint-head grass (Arthraxon hispidus) is a widespread nonindigenous plant species in the eastern United States. It is observed forming large monodominant patches that impact native and managed grassland systems. With such little understanding of its foundational biology or ecological impacts, …
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Adaptation of an invasive grass to agriculture: ecological and genomic evidence
… ability of the global invader, Johnsongrass (Sorghum halepense), representing populations from agricultural and non-agricultural habitats across its introduced North American range. We also used these populations to explore the relationship between phenotypic variation and genomic …
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Ecohydrology effects of an invasive grass (Phalaris arundinacea) on semi-arid riparian zones
… from native woody and herbaceous species to invasive grass dominated ecosystems that may alter hydrology, including changes to stream flow. Compared to the woody species they often replace, dense grass stands may have higher rates of growth (productivity) and water loss through leaves …
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Soil bacterial structure and function associated with the invasive grass Microsteguim vimineum and two native grasses
… are necessary for maintaining soil health. An invasive plant that alters the structure and function of the soil microbial assemblage could gain an advantage over native plants, enhancing its ability to invade new habitats, alter ecosystem function, and hinder efforts to reestablish native …
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The effects of fire and drought on plant-soil feedbacks of a nonnative invasive grass in southern Illinois
… respiration in stands invaded by the C4 exotic grass Microstegium vimineum. I used a manipulative field experiment conducted across two invaded sites with contrasting fire history to determine the effects of prescribed burning and growing season drought imposed using rainout shelters. I found …
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Biogeochemical effects of an invasive grass across a land-use gradient: linking alterations of nitrogen cycling to depleted soil carbon pools
… in invasion ecology is that the effects of invasive plant species depend on spatial context. Therefore, to predict how the functioning of invaded systems will change across spatially heterogeneous landscapes, there is a need to understand the mechanisms underlying the effects of invasive …
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Competitive Effects Of Increased Plant Species Richness And Increased Endemic Versus Native Generalist Species Dominance On The Invasive Grass Microstegium Vimineum During Oak Woodland Restoration
… may compete differentially with non-native invasive species. To test whether plant species richness or species fidelity to a regionally rare habitat were more important in competitively suppressing an invasive species, I established a field competition experiment in an oak woodland in …
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THE ROLE OF MICROBIAL ENDOSYMBIONTS IN SORGHUM HALEPENSE INVASIONS: EVIDENCE OF A NEW INVASION STRATEGY, MICROBIALLY ENHANCED COMPETITIVE ABILITY (MECA)
Invasive plants can profoundly alter ecosystem processes, and tremendous economic costs are often associated with these disturbances. Attributes like higher growth rates, increased biomass, and enhanced chemical defenses have been documented in many invasive plants. When expanding into new ranges, …
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THE ROLE OF MICROBIAL ENDOSYMBIONTS IN SORGHUM HALEPENSE INVASIONS: EVIDENCE OF A NEW INVASION STRATEGY, MICROBIALLY ENHANCED COMPETITIVE ABILITY (MECA)
Invasive plants can profoundly alter ecosystem processes, and tremendous economic costs are often associated with these disturbances. Attributes like higher growth rates, increased biomass, and enhanced chemical defenses have been documented in many invasive plants. When expanding into new ranges, …
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Effects of invasion by the common reed (<i>phragmites australis</i>) on carbon transformations in a Great Lakes marsh
… australis</em>) is a highly productive invasive grass that alters the wetland physiochemical environment and produces toxic secondary metabolites. Plant litter decomposition, effects of water level on soil microbes, and soil microbial response to leachate additions were investigated …
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Exploring the mechanisms and impacts of plant invasions in grasslands
… rate. Many of these non-native species become invasive by spreading across their introduced ranges and impacting native biota, ecosystems and human societies. However, the impacts of the majority of non-native plant species remain unquantified. Moreover, the mechanisms that underpin the spread …
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Applied Machine Learning with Latent Space Representation and Manipulation
… First, we monitor the distribution of buffelgrass, a type of invasive grass based on the remote sensing images taken by unnamed aerial vehicles. By applying deep learning along with the discrete latent space-assisted data augmentation, the buffelgrass patterns are accurately located. Second, …
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Leaf Traits, Neighbors, and Abiotic Factors: Ways That Context Can Mediate the Impact of Invasive Species on Nitrogen Cycling
… and in-depth studies focused on the invasive grass species, Microstegium vimineum, to better understand how (i) plant characteristics, (ii) invader abundance and neighbor identity, and (iii) environmental conditions mediate the impacts of invasion on N pools and fluxes. The results of …
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The effects of grass invasion and fire severity on Acacia koa regeneration
With spreading invasive grass increasing wildfire occurrence worldwide, there is a need for a better understanding of the relationships between native trees, fire, and grass so that land managers can increase their forested landscapes’ fire resilience. One challenge to this line of inquiry is that …
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Invasion of Hurricane-Disturbed Scrub Communities on Barrier Islands in Mississippi: a Battle Between Native and Non-Native Ecosystem Engineers
… disturbance, they can be replaced by invasive species that will dramatically alter the ecosystem in a way that may prevent its recovery. I tested several hypotheses related to this idea within barrier island scrub communities dominated by Florida rosemary (Ceratiola ericoides Michx.). …
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Herbivore movement and spatial population dynamics in a heterogeneous landscape
… within and among host-plant patches (prairie cordgrass, Spartina pectinata) is affected by the composition of the matrix (the invasive grass smooth brome [Bromus inermis], native non-host grasses, or mudflat). First, using a mark-recapture study in networks of experimental cordgrass patches that …
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The effect of turbulence on survival, dispersal, and swimming behavior of grass carp eggs and larvae
… urgent need to monitor and control the spread of invasive grass carp (Ctenopharyngodon idella) in North America. Grass carp are reproducing in tributaries to Lake Erie and control efforts targeting reproduction are greatly needed. Current strategies for their control and removal are costly and …
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Prioritizing the Management of Arundo Donax: Recommendations for Removal and Revegetation in California Riparian Habitats
<p>The highly invasive grass species, giant reed (<em>Arundo donax),</em> has been a major contributor to riparian habitat degradation in California for over 50 years. Several modes of vegetative reproduction have allowed this alien species to take advantage of fluvial processes and rapidly spread …
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Incidence, mechanisms, and consequences of adaptive habitat selection by the dickcissel (Spiza americana)
… dickcissels (Spiza americana) in the Grand River Grasslands of southern Iowa. I first tested for signals of adaptive habitat selection, examining whether male and female birds’ preferences among territories and larger habitat patches improve their ability to attract mates, avoid parasitism by …
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