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 21 for “"plant invasion"”.
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Alien plant invasion on the Agulhas Plain : a detailed description of invasion patterns
… abundance and distribution in order to determine invasion patterns and set priorities for management within a region. Such a study was adapted for the Agulhas Plain of South Africa in the Cape Floristic Region. Eucalyptus lehmannii was recognised as the top invasive alien species, occupying both …
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Pattern and process of plant invasion in an African savanna ecosystem, with emphasis on multiple spatial and temporal scales
Biological invasions are a significant ecological and economic global crisis. Protected areas also suffer from the increased burden that invasions place on their resources and the impacts placed on the ecosystem. However, management requires an ecological foundation which can inform best practice …
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Effects of natural vegetation, fire and alien plant invasion on bird species assemblages in mountain fynbos of the southwestern Cape Province, South Africa
The effects on birds of fine-scale differences in plant species assemblage and vegetation structure, and of two major disturbance factors (woody alien plant infestation and fire), were investigated in Mountain Fynbos at two sites in the southwestern Cape Province, South Africa. Three associated …
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Temporal playscape design within an existing landscape dynamic
… water drainage patterns, soil erosion, and plant invasion are instrumented into the final articulation of the playscape.
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Conservation Genetics of Narrowly Distributed Annual, <em>Erythranthe discolor </em>(Phrymaceae), in the Southern Sierra Nevada
… roads and created opportunities for non-native plant invasion. These factors can alter the delicate habitat needed for E. discolor to germinate and reproduce thereby threatening its persistence. Erythranthe discolor is currently ranked as a 4.2, watch list, by the California Native Plant Society …
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Rooting for the Home Team: Arbuscular Mycorrhizas and Root Traits in Native and Invasive Woody Shrubs
<p>Exotic species invasions present a global issue that is expected to worsen with the extreme conditions brought about by global climate change and anthropogenic disturbance. Invasive plant species in particular exhibit ecological, economic, and cultural effects on contemporary issues such as …
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Ecological implications of allelopathic interferences with reference to Phragmites australis
The effects of plant invasions on ecosystem structure and function are well studied but the pathways and mechanisms that underlie these effects remain poorly understood. In depth investigation of invasion mechanisms is vital to understanding why invasive plants impact only certain systems, and why …
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Belowground Fungal Community Change Associated with Ecosystem Development
… a coauthored published paper that describes plant invasion of fields in Virginia to determine how they impact soil bacterial and fungal communities. The bacterial and fungal communities that were invaded by 3 different plant species exhibited similar changes, regardless of plant species, …
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The Relationship Between Salvinia molesta Infestation and the Microbial Ecology of Wetlands at Caddo Lake, TX, USA
… assess microbial community response to aquatic plant invasion; however, there haven’t been any studies researching the influence of <em>Salvinia molesta </em>(D.S. Mitch.), commonly known as Giant Salvinia, on microbial communities. The goal of this study was to determine the influence of Giant …
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Beneficial Reuse of Dredged Materials in Upland Environments
… to Ca and Mg-dominated system, allowing plant invasion. In the second part of the study, a bench-scale greenhouse bioremediation experiment was conducted to test the effectiveness of biosolids, compost, and straw at enhancing PAH degradation. Initial concentrations of PAHs decreased …
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Exotic Invasive Plants on Private Woodlands of Virginia: Effects on forest composition, structure, and wildlife habitat
Exotic invasive plants have become a significant issue in the Southeastern United States for private landowners. These plants possess characteristics that allow for rapid growth and easy adaptation to many growing conditions, often outcompeting native vegetation and altering wildlife habitat, …
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Diversity, Invasibility, and Stability of Appalachian Forests across an Experimental Disturbance Gradient
For this dissertation, I measured how plant communities in Appalachian forests responded to disturbances caused by forest management activities. I had two primary objectives including (1) testing theories of biological diversity and invasions by nonnative species; and (2) providing empirical data …
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Familiarizing the Alien: Designing working nodes that reveal the opportunity of invasive alien plants as a resource in the Theewaterskloof catchment area
… is almost entirely infested with invasive alien plant species which are the single largest contributor to water loss from the dam (up to ±300 million liters of water are lost per year). Given the context of severe water scarcity in the region, the management of these alien invasive species, which …
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A Mechanistic and Landscape Scale Approach Quantifying Habitat Suitability of Cheatgrass (Bromus tectorum) Engineered Habitats for Great Basin Reptiles
… Yet, a detailed understanding of the impacts of invasion on native wildlife is lacking. Furthermore, the driving mechanisms behind those adverse impacts of invasion that have been quantified are rarely investigated. An understanding of such mechanisms is needed to predict wildlife responses to …
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Exploring the mechanisms and impacts of plant invasions in grasslands
Non-native plant species are being introduced to ecosystems worldwide at an unprecedented 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 …
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Characterization of a novel virulence determinant in Erwinia carotovora subspecies atroseptica SCRI1043
… bacteria, producing virulence factors, such as plant cell wall degrading enzymes {PCWDEs), which enable the initiation and maintenance of host plant invasion. rsmS was shown to encode a short polypeptide, and it has orthologues in many Gramnegative agriculturally and medically relevant bacteria. …
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Exotic Species Invasion and Biodiversity in Bangladesh Forest Ecosystems
Both, biological invasion by exotic plant species and biodiversity including spatial patterns and drivers are two major issues in tropical forest ecosystems. This dissertation deals with these two issues in a tropical forest ecosystem in Bangladesh. Considering the first issue, it comprises two …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
<p>Indirect interactions among plants promote conditionality in competitive outcomes that affect plant community structure and function. I utilized spatially patchy distributions of two invasive exotic plants, <i>Centaurea stoebe</i> and <i>Bromus tectorum</i>, to explore conditionality in plant …
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Using patchy plant invasions to understand how diffuse interactions modify facilitation and competition
<p>Indirect interactions among plants promote conditionality in competitive outcomes that affect plant community structure and function. I utilized spatially patchy distributions of two invasive exotic plants, <i>Centaurea stoebe</i> and <i>Bromus tectorum</i>, to explore conditionality in plant …
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The influence of rhizobacteria on the competition between native and invasive Lespedeza
Made available in DSpace on 2013-02-03T19:47:19Z (GMT). No. of bitstreams: 3 Lingzi_Hu.pdf: 805388 bytes, checksum: 890f69f54c0110d5dcb1fc44bf2f3f5a (MD5) Hu_Lingzi.docx: 919219 bytes, checksum: e299156ef3be75d6395e39d086814414 (MD5) license.txt: 4055 bytes, checksum: …
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