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 40 for “"Long distance dispersal"”.
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Investigating the Role of Long Distance Dispersal in the Response of Stream Fishes to Urbanization
… in urban impact in order to assess the role that long distance dispersal plays in the response of tolerant stream fishes to urbanization. Our two stream sites included a heavily impacted urban stream (watershed impervious surface cover ~30%) and a mildly impacted rural stream (watershed impervious …
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Biogeography of Isolepis subgenus Fluitantes (C.B. Clarke), Muasya (Cyperaceae): niche conservatism, long distance dispersal and hybridization
… Hemisphere are maintained by wind-assisted long-distance dispersal. The Fluitantes clade of lsolepis (Cyperaceae: Cypereae) is distributed throughout these areas and provides a useful study group to assess the general validity of published biogeographical trends. Furthermore, the …
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Systematics, Phylogeography and Ecology of Elaphomycetaceae
… possible effects of asexuality, trophic niche, dispersal method, and ocean barriers on population structure. In Chapter 2, we examine the systematics and phylogeography of the Elaphomycetaceae, a family consisting of the truffle genus Elaphomyces and the stalked genus Pseudotulostoma, …
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Population and evolutionary dynamics during microbial range expansions
… frequent due to environmental changes and rare long distance dispersal, often facilitated by anthropogenic activities. Simple models in theoretical ecology explain many emergent properties of range expansions, such as a constant expansion velocity, in terms of organism-level properties such as …
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Predicting rates and patterns of alien plant spread
… a useful tool for exploring the role of long-distance dispersal in determining invasion rates. I show that long-distance dispersal is extremely difficult to define statistically, but is a key determinant of invasion rates. The model is validated using independent data on the spatial …
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Modelling atmospheric dispersal of fungal pathogens on continental scales to safeguard global wheat production
… computational resources are used to investigate long-distance dispersal revealing atmospheric pathways that connect entire continents. Mechanistic simulations of turbulent atmospheric spore dispersal are conducted. The analyses bring together a variety of data, including international field …
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Influence of hydrodynamics on the larval supply to hydrothermal vents on the East Pacific Rise
… for hydrothermal vent gastropod larvae along the northern East Pacific Rise. Daily and weekly variability in the supply of hydrothermal vent gastropod larvae to two hydrothermal vents, 1.6 km apart on the East Pacific Rise, were quantified concurrently with current velocity observations. …
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Density and Age Distributions of Trees in Upland and Lowland Oldfields 60 Years After Abandonment: The Role of Dispersal
… virginiana individuals did not decrease as distance from the edge increased in either uplands or lowlands. Age of Acer rubrum individuals decreased marginally as distance from the edge increased in the upland sites, but slope of the regression was not significant in the lowlands. Ages of …
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Elephant fruit :The dispersal attributes of Balanites maughamii / Storme Viljoen
Endozoochorous plant species that have obligate dispersal mutualisms with megafauna are at risk of extinction because of the unique conservation threats associated with large animals. This study examines Balanites maughamii which appears to have similar dispersal attributes to Sclerocarya birrea …
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Dating the emergence of the divaricate habit in the New Zealand flora
… formerly part of Gondwana: vicariance and long-distance dispersal—Corokia appears to be one of an increasing number of cases where long-distance dispersal is indicated. The dated phylogeny of most New Zealand divaricate species presented in Chapter 4 reveals that, in the great majority of …
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Factors affecting VA-mycorrhizal community structure in the Namib Dune Field: and the population biology of an ectomycorrhizal Basidiomycete: Suillus granulatus
… as increased colonization of roots, continued as long as moisture was available, and spore production occurred in response to declining moisture availability. While abiotic factors determine community structure of VAM fungi in the Namib dune field, preliminary studies suggest that the phytobiont …
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Plant community assembly and biodiversity: a spatio-temporal perspective
… that drive these changes, were investigated along a more than 300 year long chronosequence representing an arable to semi-natural grassland succession. Both grassland plant species richness and functional trait diversity in grassland sites were to a large extent explained by the land use …
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FROM TURF TO TURF: FUNGAL INVASION OF ASCOCORYNE TURFICOLA IN A NORTHERN MICHIGAN BOG
… similar bogs nearby. This species is adapted to long distance dispersal and carries the potential to continue spreading. Using a combined approach of NMDS ordination and a case-controlled, binomial logistic repression, I modeled the vegetation and environmental variables associated with <em>A. …
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Spatial and temporal population genetics at deep-sea hydrothermal vents along the East Pacific Rise and Galápagos Rift
… by frequent physical disturbance. Larval dispersal among disjunct vent sites facilitates the persistence of sessile invertebrate species in these geologically and chemically dynamic habitats despite local extinction events. Regional population extension and rapid recolonization by the …
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Effectiveness of Surrogators As A Propagation Tool for Northern Bobwhites In South-Central Texas
… low post-release survival rates (8-15 days) and long distance dispersal from release sites averaging 2.33 km. Claims have been made that Surrogators®, a quail propagation tool, has increased success rates in both these areas. Following steps outlined in the Wildlife Management Technologies 2009 …
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An Evolutionary and Ecological Investigation into the Enigmatic Stalked Puffball Genus Tulostoma
… phylogeography also suggests both vicariance and long-distance dispersal events contributing to the diversification of the species over the evolutionary history of the genus. The evolution of spore morphology is then investigated using a phylogenetic approach. The ancestral character state for …
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Phylogeography of eastern leatherwood (Dirca palustris L.) resolved by chloroplast sequencing and microsatellite genotyping
… mesic forests and the paucity of vectors for dispersal of its seeds, represents a classic example of Reid's paradox of plant migration. It long has been presumed that temperate forest species of eastern North America persisted in southern glacial refugia near the Gulf Coast, after which many …
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Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts
The mechanisms of faunal dispersal across ocean basins are key unknowns toward understanding of the modern biogeography and biodiversity of deep-sea fauna. Seamounts are considered to play a defining role in faunal evolution, acting as regional centers of speciation, “stepping-stones” for …
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Environmental and landscape determinants of population genetic structure and diversity of the great fruit-eating bat, Artibeus lituratus, in Atlantic forest remnants in South America
… correlation between genetic and geographic distance in fragmented or continuous forest. Comparison of empirical and simulated landscapes indicated empirical results were consistent with regular long-distance dispersal and high migration rates. I then determined unique and shared effects of …
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Spatial and temporal population genetics at deep-sea hydrothermal vents along the East Pacific Rise and Galápagos Rift
… by frequent physical disturbance. Larval dispersal among disjunct vent sites facilitates the persistence of sessile invertebrate species in these geologically and chemically dynamic habitats despite local extinction events. Regional population extension and rapid recolonization by the …
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