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 24 for “"demographic processes"”.
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Demographic processes determining the range dynamics of plant species, and their consequences for biodiversity maintenance in the face of environmental change
… data. The model has a spatially-explicit demographic submodel (describing dispersal, reproduction, mortality and local extinction) and an observation submodel (describing imperfect detection of individuals). The demographic submodel links species-specific habitat models describing the …
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Integrating dynamic and statistical modelling approaches in order to improve predictions for scenarios of environmental change
… in SDMs. Furthermore, neither dispersal nor demographic processes and biotic interactions are explicitly incorporated. Therefore, it has often been suggested to link statistical and mechanistic modelling approaches in order to make more realistic predictions of species’ distributions for …
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Mathematical modeling for epidemiological inference and public health support
… for a better understanding of the role of demographic processes in shaping the circulation of infectious diseases. In Chapter 2 we use the model for VZV transmission developed in Chapter 1 to evaluate the effectiveness of varicella and HZ vaccination programs in Italy. With a view to the …
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Linking Spatial Patterns of Seed Dispersal and Plant Recruitment in a Neotropical Tree, Virola Calophylla (Myristicaceae)
… the initial spatial template upon which demographic processes are played out to produce spatial structure in plant populations. The objective of this investigation was to develop a thorough understanding of the spatial pattern of seed dispersal, the factors affecting it, and its …
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Vegetation patterns and plant reproductive processes in the succulent Karoo
… on vegetation patterns and plant reproductive processes at the Tierberg Karoo Research Centre (33°1 0'S, 22°17'E) in the semi-arid southern Succulent Karoo, South Africa. It begins with an investigation into the roles of soil properties and competition in explaining variation in species …
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Multivariate statistical modelling of family formation processes among women in Namibia
… Many studies have revealed shifts in demographic processes including child-bearing patterns, age at sexual debut and first marriage, and marital status over the years. While there have been numerous studies in demographic processes in specific populations, very few studies have focused …
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Landscape genomics of tropical high altitude plant species
Changes to species distributions involve demographic processes that occur over generations and affect allele frequencies within populations, leading to patterns of genetic restructuring. The specific genetic structuring patterns that will be observed as a consequence depend on explicit geographical …
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The spatial scale of immune gene variation within and among bottlenecked populations
… that the pipits inhabit. I found that while demographic history has played the major role in shaping patterns of among population variation at toll-like receptor loci, balancing selection (possibly pathogen-mediated) appears to have helped maintain functional variation at some specific loci. …
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Forest dynamics at regional scales: predictive models constrained with inventory data
… forest dynamics by scaling from key tree-level processes, but models typically have no climate dependency. In this thesis I demonstrate how large-scale national inventories combined with improvements in computational methods mean that models that incorporate the climate dependency of demographic …
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Genetic Marker-Assisted Management of Virginia Sport Fishes
… relatedness, likely effects of both natural demographic processes and stocking. The extent of Eastern Highlands Walleye includes both the Ohio and Tennessee basins. Although I did not identify new marker alleles for native New River Walleye, I determined that marker-assisted selection has …
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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
… evolutionary biologists attempt to understand processes that determine distribution, abundance, and diversification of taxa through space and time. Genetic variation can provide insight into mechanisms governing the distribution and structure of natural populations, and population responses to …
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The Influence of Fluvial Geomorphic Processes on Spatial Patterns of Forest Primary Succession
… southeastern US. I hypothesized that geomorphic processes associated with river planform cause patterns of tree species to vary predictably along point bars as well as with increasing age of land during forest primary succession. By mapping trees and seedlings I determined that common canopy …
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Improving rabies control in free-roaming dogs
… on disease incidence may be affected by dynamic demographic and immunological processes. Specifically, the contribution of these processes, and their regulatory factors, to vaccination coverage and rabies transmission has not been comprehensively estimated. To improve rabies control, through …
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Spatiotemporal Modeling for Wildlife Demographic Analysis: Bridging Analysis to Waterfowl Conservation
… is critical to understanding the fundamental demographic processes (e.g. reproduction, survival, growth, and dispersal) that govern populations and manage them in an increasingly altered world. Population dynamics often respond to environmental alterations, such as habitat fragmentation, …
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The Effects of Invasive Plants on Biodiversity Across Spatial Scales
… which these studies take place. In addition, the processes by which invasive plants influence community structure leads to slow, long-term extinction dynamics that mask likely future plant extinctions.</p> <p>In Chapter 1, I used a meta-analysis to examine the influence of invasive plants on plant …
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Branching out: A comparative analysis of demographic determinants of mammalian speciation
… which is determined by the interaction between demographic and genetic processes. These demographic processes include the formation of population isolates and the persistence of these isolates. The role and regulators of the demographic determinants of speciation have received some empirical …
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The Life History of Damaraland Mole-rats Fukomys damarensis: Growth, Ageing and Behaviour
… mole-rats have overlooked the importance of demographic processes (and associated behavioural influences) on mortality schedules. Irrespective of the proximate basis of the longer lifespan of breeders, at an interspecific level the social mole-rats are unusually long-lived for their size. A …
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