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 294 for “"Native species"”.
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Invasive non-native species and the management and exploitation of freshwater ecosystems
… vulnerable to the establishment of invasive non-native species (INNS), whose prevalence has rapidly accelerated through the expansion of global travel, trade, and transportation. INNS can drive significant changes in habitat suitability and native community composition. I investigated how INNS …
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Assessing the vulnerability of Antarctic marine ecosystems to invasive non-native species
Invasive non-native species are a major threat to global biodiversity. For at least 15 million years coastal Antarctica has been poorly connected to nearby temperate ecosystems due to physical and physiological barriers. Yet, Antarctica is experiencing significant environmental change and becoming …
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Seed and vegetative propagation methods for the rare Florida native species Chionanthus pygmaeus (pygmy fringetree)
… (Oleaceae) is an endemic and rare Florida species, which has an attractive, small habit giving it great potential for use in managed landscapes. Members of the genus Chionanthus are difficult to propagate via cuttings and possess complex seed dormancies that are not well understood. …
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Fire, Soil, Native Species and Control of <em>Phalaris arundinacea</em> in a Wetland Recovery Project.
… was investigated by: 1) correlating cover and species richness with soil characteristics across transects; 2) burning and herbicide use to determine conditions facilitating native plant establishment; and 3) hemi-parasitic <em>Pedicularis lanceolata</em> tested as a biological control.</p> …
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Conservation of the native freshwater fishes of the Cape floristic region (South Africa) : management of non-native species
… habitat degradation and the introduction of non-native species, will continue to place pressure on the remaining native freshwater fishes. A meta-analysis estimated that more than 90% of river habitat in three major catchments has been invaded by non-native fish and that catchments covering less …
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The role of Marine Renewable Energy structures and biofouling communities in promoting self-sustaining populations of Non-Native Species
… have the potential to promote the spread of non-native species (NNS). Knowledge of how community composition resident on MREDs is shaped by geography, local hydrodynamics and the duration of deployment, will clarify how these technologies will interact with natural habitats, including the …
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Effects of fire and treefalls on Japanese climbing fern and native species groundcover in a restored longleaf pine savanna
… The combination of windstorms and fires promotes native herbaceous species, but also promotes invasion of Japanese climbing fern (Lygodium japonicum). Lygodium japonicum is an invasive fern with subterranean rhizomes and copious spore production invading pine savannas along the southeastern Gulf …
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The Influence of Metacommunity Connectivity and Invasive Species on Diversity and Ecosystem Properties: Invasion, Predation by Native Species, and Genetic Diversity of Propagules
Invasive species are recognized for exerting strong negative impacts on native biota and ecosystems. Because of this, billions of dollars are spent toward invasion prevention and control efforts annually. Once invaders have become established in a novel environment, however, eradication efforts are …
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The Consequences of Non-Native Species Invasions on the Contemporary and Historic Trophic Ecology of Native Sport Fish in a Lake Michigan Embayment
… of Lake Michigan’s Little Bay de Noc. We found species-specific differences in the δ<sup>15</sup>N and δ<sup>13</sup>C values for 14 fish species. High degrees of niche overlap between walleye, northern pike (<em>Esox lucius</em>), smallmouth bass (<em>Micropterus dolomieu</em>) and yellow perch …
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Development of native species of Crete in the urban landscape: an investigation of systems and plant reproduction, adaptability and fitness of wild species in commercial horticulture
… offers the possibility of selecting native species with high ornamental value for use in urban landscapes and commercial horticulture. To assess this potential eight species were selected: Staehelina petiolata, Ptilostemon chamaepence, Otanthus maritimus, Prasium majus, Convolvulus …
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Abundance Trends and Drivers of Change in Freshwater Fish Communities of the New River Basin
Habitat destruction/alteration and non-native species are widely considered the two most serious threats to biodiversity within freshwater ecosystems, which are among the most threatened in the world. I examined the effects of these factors, specifically focusing on land use and non-native species …
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Predicting the distribution and impacts of non-native birds in the Iberian Peninsula
Increasing numbers of species are being transported beyond their natural range boundaries by humans. These non-native species can have severe negative impacts on native biodiversity. In order to guide management of these species it is important to be able predict where non-native species will …
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Marine Invasive Species in the Galapagos Marine Reserve
… transport and tourism. Invasions occur when species get transported from one region to another and establish themselves in the new habitat. These species compete for space and resources, displacing native species and changing, populations and communities. Invasive non-native species are the …
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Ecological implications of introducing Leucaspius delineatus (Heckel, 1843) and Pseudorasbora parva (Temminck and Schlegel, 1842) into inland waters in England
Non-native species invasions threaten the structure, function and biodiversity of ecosystems worldwide, and those of non-native fishes pose amongst the greatest threats to inland waters of the U.K. This PhD investigated the establishment, dispersal and ecological implications of introducing the two …
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NATURAL REGENERATION DYNAMICS AND SURVIVAL INFLUENCED BY ABIOTIC AND BIOTIC FACTORS IN A BOTTOMLAND HARDWOOD FOREST
… forests, however, are threatened by invasive species, land loss/conversion, inconsistent or absence of harvesting disturbances, and altered hydrological patterns, leading to reduced success of desired, native species. This research assessed regeneration dynamics and one-year survival in a …
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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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Cheatgrass (Bromus tectorum L.) management and native plant community recovery on sites selectively treated with Imazapic in Rocky Mountain National Park
… invades disturbed sites and competes with native plant species by rapidly establishing a root system capable of depleting soil moisture and available nitrogen, making cheatgrass control a priority when restoring disturbed areas within RMNP. The purposes of this study were to determine the …
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The effects of herbivory, competition, and disturbance on island meadows
It is an unresolved paradox that non-native species are successful in novel environments whereas native species, presumably adapted to that environment, decline. This knowledge gap has persisted because third party processes in invasion ecology have been overlooked. Ungulate densities are …
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The Status of the Genus Taxus In Kentucky
… of field and herbarium specimens from both native and non-native species, microscopic analysis of leaf ultrastructure, chemical analysis of taxane content, and the construction of GIS models to predict the occurrence of the native species. In the review and examination of morphological …
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