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 20 for “"species invasion"”.
-
Biogeographical Approaches for Studying Species Invasion
Many of the most notorious biological invasions occur at continent-wide or global scales but studies investigating mechanisms enhancing species invasions are often conducted at small spatial scales. Moreover, the contribution of mechanisms facilitating invasion might also vary across a geographical …
-
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 …
-
Spatiotemporal population genomics of marine species : invasion, expansion, and connectivity
… change, with an emphasis on invasive marine species. Biological invasions are often characterized by a range expansion, during which strong genetic drift is hypothesized to result in decreased genetic diversity with increased distance from the center of the historic range, or the point of …
-
Spationtemporal population genomics of marine species : invasion, expansion, and connectivity
… change, with an emphasis on invasive marine species. Biological invasions are often characterized by a range expansion, during which strong genetic drift is hypothesized to result in decreased genetic diversity with increased distance from the center of the historic range, or the point of …
-
Insights in plant ecology from Bromus tectorum invasion in the Great Basin, USA
Species invasion is a widespread occurrence that adversely affects native ecosystems. This dissertation examines Bromus tectorum invasion in the Great Basin to increase scientific understanding of invasion dynamics and to provide rigorous information to enhance land management. First, a conceptual …
-
Alien plant invasion on the Agulhas Plain : a detailed description of invasion patterns
Invasive alien species occur within several biodiverse regions of South Africa. It is not yet fully understood the extent to which invasive alien species affect natural vegetation. It is important to classify such species based on abundance and distribution in order to determine invasion patterns …
-
Ecology and Reproductive Biology of Calotropis procera (Aiton) W.T in some parts of Mopani District Limpopo Province
Plant species play a crucial role in maintaining the normal functioning of various ecosystems. However, native species often face decline or extinction due to alien species' invasion and its detrimental impact. One such invasive species, the widespread shrub or medium-sized tree Calotropis procera …
-
Application of whole-cell biosensor for the impact of crude oil exploration on the environment of the Niger Delta
… qualities of cost-effectiveness and zero risk of species invasion on the environment has become more apparent from extensive experimentation.
-
Application of whole-cell biosensor for the impact of crude oil exploration on the environment of the Niger Delta
… qualities of cost-effectiveness and zero risk of species invasion on the environment has become more apparent from extensive experimentation.
-
The legacy of macroevolution: understanding and predicting evolutionary responses to novel environments
Understanding how species will respond to global change is a major challenge for biologists. Two factors that play an important role are evolutionary constraints and contingencies. Evolutionary constraints are limitations on how species can adapt and change imposed by past evolutionary history, …
-
Plant community restoration on mima mounds at Turnbull National Wildlife Refuge, WA
<p>"Prevention and management of exotic plant species invasion can diminish their negative ecological and economic impacts and maintain ecological functions provided by native species. This is particularly important in rare landscapes that provide essential habitat. The most successful management …
-
The Influence of Multiple Scales of Environmental Context on the Distribution and Interaction of an Invasive Seagrass and its Native Congener
Predicting invasive species impacts is complicated by the variable context in which they occur. Furthermore, species invasion is an inherently multi-scale process, war- ranting examination at multiple spatial scales. In its introduced range, the invasive seagrass <italic>Zostera japonica</italic> …
-
The relationship between invasive annual grasses and biological soil crust across Eastern Washington
… in restoration and management plans. Managing invasion resistance of natural areas is critical to maintaining their biodiversity and function. Climate change is expected to shift species interactions, including invasive annual grasses, and may alter invasion resistance. One component of …
-
Analysis of Hydric Pine Flatwood Ephemeral Pool Macroinvertebrate and Crustacean Assemblages Along a Temporal and Spatial Gradient From a Hypothesized Colonial Source
… Strand hydric pine flatwoods mimics those for invasion of isolated islands in the world's oceans. Species invasion is rapid by active dispersers and slightly slower by passive dispersers. Colonization is dependent upon distance to the recipient islands, both spatially and temporally, and the …
-
Interplay between competition and evolution in invaded and native plant communities
… to shape communities. In my dissertation, I use species invasions to investigate the evolutionary and ecological consequences of plant interactions and their effects on plant community assembly.</p> <p>In my first chapter, I investigated complex ecological interactions between Euphorbia esula, an …
-
Interplay between competition and evolution in invaded and native plant communities
… to shape communities. In my dissertation, I use species invasions to investigate the evolutionary and ecological consequences of plant interactions and their effects on plant community assembly.</p> <p>In my first chapter, I investigated complex ecological interactions between Euphorbia esula, an …
-
Vegetation colonization within exposed reservoirs following dam removal on the Elwha River, Washington
… In each plot , I recorded vascular plant species composition and woody species height. I collected and pooled 8 soil samples (20 cm) / plot to assess percent organic matter, nutrients, and percent sand, silt, clay, and conducted a Wolman Pebble Count. I used a structural equation models to …
-
Restoring semi-arid lands with superabsorbent polymers under reduced precipitation and threat of Bromus tectorum invasion
… constrained by low and variable moisture and invasion by exotic species. After disturbance, variability in resources as well as inherent soil moisture and temperature regimes may influence the susceptibility of an ecosystem to exotic species invasion. The invasive winter annual grass, Bromus …
-
Establishment and trait variation of a range expanding Brassicaceae species under various growth conditions
Non-native plant species and invaded habitats are expanding more rapidly around the globe. Certain species have successfully colonized areas beyond their native habitats, while others have experienced rapid population increases. Some of these species have emerged as the main contributors to the …
-
Influence of fire and habitat on the removal of invasive plant seeds by granivores in longleaf pine savannas
Invasions of fire-dependent ecosystems by exotic woody plant species can disrupt fire cycles and alter successional trajectories. Prescribed fire is an important tool for managing such ecosystems, yet the role of top-down processes in mediating fire effects on invasion remain poorly understood. …