Global ETD Search
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Showing 1 to 20 of 39 for “"propagule"”.
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An Investigation into the importance of propagule provenance in restoration ecology
… restoration ecologists that using non-local propagules in revegetation schemes may influence the success of grassland restoration. This research programme investigated the importance of propagule provenance in restoration schemes. In particular the work focused on two areas. Firstly, the …
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The eco-evolutionary consequences of multiple introductions for colonizing individuals
… shifts, and reintroductions of rare species. Propagule pressure, which comprises the number of introduction events (propagule number) and the number of individuals per introduction event (propagule size), consistently correlates with a greater probability of population establishment. It is …
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Regional Rarity: Consequences of Dispersal Limitation and Strategies for Reintroduction
… contribute to rarity, including species traits, propagule limitation, ecological requirements, and population level processes such as demographic and environmental stochasticity. Yet, our understanding of species rarity remains limited since few studies have examined how these factors act in …
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Ecotypic Variation in Johnsongrass in Its Invaded U.S. Range
… halepense (L.) Pers.) seedling stress response, propagule cold tolerance, and large-scale niche dynamics for correlation with populations' climatic and ecotypic (i.e., agricultural vs. non-agricultural) origin. Overall, I found a greater number of home climate effects than ecotypic effects on …
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Manipulating Flowering Times and Site Attractiveness To Pollinators To Improve Yield and Fruit Quality in Strawberry
… produce. This study aims to establish optimal propagule and interrow cover cultivation for New York berry growers to extend the local strawberry season, maximize their yields though day-neutral production, and create a more pollinator-friendly production system. Fragaria x ananassa ‘Albion’ was …
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Combining ability study for the development of resistance to Aflation contamination by Aspergillus flavus link ex fries in groundnuts
… levels and colony forming units measured as propagule density (cfu)g-1 soil were observed. Total aflatoxin B1 contamination levels ranged from 0.2parts per billion (ppb) to 7.3 ppb, while propagule densities of Aspergillus flavus ranged from log(10) 4.11 to 4.78 cfu g-1 soil. Combining …
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Combining ability study for the development of resistance to Aflation contamination by Aspergillus flavus link ex fries in groundnuts
… levels and colony forming units measured as propagule density (cfu)g-1 soil were observed. Total aflatoxin B1 contamination levels ranged from 0.2parts per billion (ppb) to 7.3 ppb, while propagule densities of Aspergillus flavus ranged from log(10) 4.11 to 4.78 cfu g-1 soil. Combining …
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Community and ecosystem changes in tallgrass prairie restorations: the effects of population source and diversity
… was to quantify the effects of dominant grass propagule source (i.e., cultivar vs. non-cultivar) and seeded diversity of propagules on community structure and ecosystem function during prairie restoration. Two field experiments, and two chronosequences were used to investigate this main …
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Biotic and climatic factors affecting the colonisation of wood-invading fungi
… by the Micromycetes. The importance of fungal propagule availability and the role of propagule vectors in the colonisation and succession of in-service .ioinery was investigated. It is considered that the availability of fungal propagules in air is the main source of fungal infection. However, …
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The role of waterbirds in the dispersal of aquatic organisms in southern Africa
… of dispersing on their own and instead produce propagules that must be transported to new habitat by a vector. Propagule dispersal by frugivorous bird species is well researched, but only very recently has the capacity of highly mobile waterbirds to disperse aquatic organisms received similar …
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Assessment of small scale tallgrass prairie restoration in an urban environment
… indicators of success including vegetation, the propagule bank and insects. However, not all attributes delivered equivocal results. This suggests that multiple measures should be used to assess a restoration site. Anthropogenic and biophysical variables were found to influence vegetation of the …
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Allee effects and the persistence of small populations
… factor that underpins the widespread effect of propagule pressure on establishment success. By using a weed biological control agent, Neolema ogloblini, as a model insect pest species, I investigated the impact of propagule size on establishment success and found evidence that cautiously …
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Studies on the spread of Verticicladiella procera by soil-borne and insect-borne propagules
… the causal agent of Procera Root Disease (PRD). Propagule germinability in artificially infested soil decrease rapidly under natural and controlled conditions. Colonization of seedlings in artificially infested soil was rare and symptoms were not displayed by colonized seedlings. Natural …
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Ecological implications of introducing Leucaspius delineatus (Heckel, 1843) and Pseudorasbora parva (Temminck and Schlegel, 1842) into inland waters in England
… The drift dynamics, i.e. timing and intensity (propagule pressure), of sunbleak and topmouth gudgeon were assessed for source populations to determine dispersal potential. Potential risks for native species posed by these two alien cyprinids were assessed with respect to the parasite fauna and …
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Salinity Tolerance of Flowering Rush, Butomus umbellatus
… efforts. These studies investigated vegetative propagule germination and growth of four genotypes of flowering rush when exposed to a range of salinities (0-35 ppt). Germination and growth were assessed through benchtop and mesocosm experiments. Germination varied among cytotypes with triploids …
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Biological control studies of Phytophthora Parasitica root rot of boxwood using multiple antagonists
… indicating that spores may be a more suitable propagule than mycelial fragments when storing fungal isolates for more than 1 week. No significant or consistent changes in population viability occurred among the actinomycete and bacterial isolates. Carboxymethyl cellulose was a more readily …
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Determinants of native and exotic plant species diversity and composition in remnant oak savannas on southeastern Vancouver Island
… different ways. Roads increase both exotic propagule pressure and disturbance, which may facilitate exotic invasion. In contrast, disturbance from roads may increase the likelihood of local extinction for particular natives. Differing climatic preferences within the native and exotic species …
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Biodiversity impacts of Chilean needle grass Nassella neesiana on Australia’s indigenous grasslands
… intact grassland was not invaded, even with high propagule pressure. Gaps of c. 1 m (as opposed to 10-30 cm) were required for establishment. Pin transect sampling demonstrated that increased senescence of Themeda triandra swards correlated with greater invasion. Nassella neesiana was found to …
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Comparison of Bare Root vs. Potted Plants, Species Selection, and Caging Types for Restoration of a Prairie Wetland, and Quantitative Analysis and Descriptive Survey of Plant Communities and Associations at Lewisville Lake Environmental Learning Area (LLELA), Lewisville, TX
… no significant difference in the success of the propagule types for Sagittaria latifolia. The treatments planted with intact root systems showed significantly higher growth and reproduction than the bare-root treatments for Eleocharis quadrangulata, Heteranthera dubia, and Vallisneria americana. …
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