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 20 for “"Dispersal mechanisms"”.
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DISPERSAL MECHANISMS OF EMBRYONIC AND LARVAL BURBOT (LOTA LOTA)
… that primarily rely on hydrodynamic forces for dispersal. However, allometric growth patterns and larval behavior also plays a significant role in dispersal. The developmental timeline of dispersal mechanisms in burbot (<em>Lota lota</em>) larvae is crucial to understanding where they may settle …
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Optimizing Powder Metallurgy Methods: Carbon Nanotube Metal Composites
… is two-fold: 1) optimize carbon nanotube (CNT) dispersal mechanisms in the fabrication of aluminum carbon nanotube metal-matrix composites (Al-CNT/MMCs) via the powder metallurgy method (PM), 2) characterize the effects of CNT morphology on the physical properties of Al-CNT/MMCs.
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Studies on the spread of Verticicladiella procera by soil-borne and insect-borne propagules
Studies were undertaken to determine the dispersal mechanisms of Verticicladiella procera Kendrick, 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 …
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Evolutionary and ecological genomics in deep-sea organisms
… I suggest that the geological processes and dispersal mechanisms discussed here can explain distribution patterns of many other marine taxa. I then move on to resolve long-standing questions regarding species definitions in recalcitrant deep-sea coral taxa. Finally, I explore the adaptive …
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Seasonal and lunar patterns of peach blossom jellyfish (Craspedacusta sowerbii) in Michigan
… States, yet its distribution, abundance, and mechanisms of dispersal remain poorly understood. Given its uncertain status, understanding the ecology of this species is a priority. To characterize population dynamics during the medusa season, surface water temperature and medusa abundance were …
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An Examination of Puccinia Mariae-Wilsoni Infection of Claytonia Virginica
… virginica), but little is known about the dispersal mechanisms. Wind or ants and other insects may be responsible for dispersal by transferring fungal spermatia or spores among neighboring plants. I experimentally tested four possible vectors of spore transfer by excluding wind, ants …
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The biogeography, phylogeny, and dispersal of freshwater and terrestrial free-living ciliates in Florida, USA.
… to enhance discussions surrounding potential dispersal mechanisms of target ciliate species over large distances. Agent based models were constructed to visualize microcosm interactions of a target ciliate species to various environmental stimuli.
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Ecology and Reproductive Biology of Calotropis procera (Aiton) W.T in some parts of Mopani District Limpopo Province
… fruit, and seed production, as well as seed dispersal mechanisms. This information is vital for determining the optimal periods for eradication or control efforts. The distribution pattern of Calotropis procera (Aiton) W.T. was analyzed using the Clark and Evans (1954) method, and …
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Distribution and dispersal of the non-native caprellid amphipod, Caprella mutica Schurin 1935
… provide information regarding the modes of dispersal and potential future range of this and other non-native species. Information regarding the biology and ecology of C. mutica was collected through a study of its seasonal population dynamics. Globally, C. mutica has established populations …
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Evolutionary and ecological genomics in deep-sea organisms
… I suggest that the geological processes and dispersal mechanisms discussed here can explain distribution patterns of many other marine taxa in addition to barnacles. Regional-scale analyses indicate that vent barnacle populations are well connected within basins and ridge systems, and that …
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Impacts of meteorology-driven seed dispersal on plant migration : implications for future vegetation structure under changing climates
… of seeds and do not generally consider seed dispersal mechanisms and plant migration processes, which may influence the impacts of vegetation structural changes on the climate system (i.e., change in albedo, runoff, and terrestrial carbon sequestration capacity). For the first time, this …
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Ecology of benthic macroinvertebrates in experimental ponds
… numbers, probably due to lack of efficient dispersal mechanisms. Fifteen metrics were analyzed by a statistical procedure that indicates the percent change that must occur (detection limit) to detect true differences between two means. The metrics with the lowest detection limits (usually < …
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Animal dispersal of American ginseng (Panax quinquefolius L.)
… demographic and conservation based studies. Seed dispersal is a critical component of ginseng demography lacking empirical evidence for potential dispersal mechanisms. To date, gravity is considered to be the primary mechanism of dispersal, but the production of red, fleshy berries during the late …
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Dynamics of deep-submarine explosive eruptions
… particle separation, and consider the particle dispersal mechanisms of these complex multi-phase flows. In chapter 3 we explore the dynamics of particle-laden fountains in a stratified environment, and identify two distinct flow regimes as a function of the average size of the particles, in …
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SEED BANK DYNAMICS WITHIN A METAPOPULATION FRAMEWORK: A STUDY OF AN ANT-DISPERSED SPECIES
<p><strong>Questions. </strong>How do spatial and temporal landscape dynamics, including past disturbance, affect the distribution of the seed bank of an early-succession species? Do these factors ultimately influence above-ground subpopulation persistence within a metapopulation …
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Factors influencing the occurrence of stinging jellyfish (Physalia spp.) at New Zealand beaches
… descriptions as well as information about their dispersal mechanisms such that meaningful patterns of distribution and dispersal are almost impossible to determine. Molecular systematics has proven to be a powerful tool for species identification and for determining geographical distributions. …
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Biogeography and phylogenetics of grassland auchenorrhyncha
… some general patterns for the origin and dispersal of grassland animals, these patterns may not be applicable to less studied groups of organisms due to differences in natural history traits, such as dispersal mechanisms. To address this limitation, I examined the historical biogeography …
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Flora of the Cape Peninsula : endemism, threatened plants and conservation in perspective
… a low, non-sprouting shrub with short-distance dispersal mechanisms. The profile of threatened taxa was found to be similar to endemic taxa. Many of these biological characteristics make these taxa vulnerable to extinction and therefore have certain management implications concerning their …
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SEED DISPERSAL ROLE AND NUTRITIONAL STUDIES OF TWO SERRASALMID FRUGIVORE AMAZON FISH, BLACK PACU AND RED PACU
… 1) to assess the effects of fish size on seed dispersal capacity of black and red Pacu; 2) to compare seed dispersal potential of these two Amazon fishes against two other seed dispersal mechanisms (anemochory and hydrochory); 3) to determine the apparent digestibility coefficients (ADC) of …
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Morphodynamics and driftwood dispersal in braided rivers
… supply and log properties (size and shape) on dispersal patterns; c) investigating wood remobilisation induced by discharge fluctuations and bed reworking; and d) analysing long-term wood storage volume and budget. A combination of field-scale direct observations, remote sensing techniques and …