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 21 for “"Macroecology"”.
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Macroecology : exploring forest investment strategies
In this project a novel approach to modelling allocation is proposed by using quantitative economic theory to describe allocation. Where “investment” has often been used to describe the process of allocation this framework proposes a more literal use of economic theory by the application of …
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The macroecology of Southeast-Asian hawkmoths (Lepidoptera: Sphingidae)
… patterns of biodiversity, biogeography and macroecology. Data on the distribution of species were retrieved from published and unpublished faunal lists and museum collections (in close cooperation with the Natural History Museum, London). Over 34,500 records of the global distribution of the …
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The Macroecology of Microorganisms: From Pattern to Process
… regions, highlighting a difference in the macroecology of micro- and macroorganisms. I build on this finding by showing that different regional microbial communities can show considerably different responses to the same environmental gradient, hinting that regional communities play an …
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Towards a Temporal Theory of Ecology: Body Mass Role for Activity Patterns of North American Artiodactyls
… contributes to a previously unexplored aspect of macroecology relationships at a continental-scale approach by addressing the relationship between body mass and activity patterns in North American artiodactyls within the context of intraspecific diel temporal niche conservatism.
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Assessing the Imprint of Geography, Host Species, Land Cover and Space on the Local Abundance of a Generalist Nest Parasite, the Brown-headed Cowbird
… we used SAM 4.0 (Spatial Analysis in Macroecology) software to implement simultaneous autoregressive modeling of the error term. We then used a model comparison approach to identify the factors that most affect cowbird abundance. Among all models examined, host species richness was the …
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The effect of the study region on GIS models of species geographic distributions and estimates of niche evolution; preliminary tests with montane rodents (genus Nephelomys) in Venezuela
… region. In addition to uses in areas such as macroecology and conservation biology, this approach has been applied recently to studies of niche evolution and historical biogeography. Definition of the study region is critical for all of these applications but has not been addressed previously. …
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The ecological and evolutionary drivers of spatial biodiversity patterns
… empirical studies which link community ecology, macroecology, and macroevolution to better understand spatial diversity patterns in plants and lizards. Chapter Four integrates phenotypic and spatial data to look at what drives global patterns of species richness in ten different lizard clades, …
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The ecological and evolutionary drivers of spatial biodiversity patterns
… empirical studies which link community ecology, macroecology, and macroevolution to better understand spatial diversity patterns in plants and lizards. Chapter Four integrates phenotypic and spatial data to look at what drives global patterns of species richness in ten different lizard clades, …
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The effects of accelerated soil acidification on aggrading temperate deciduous forests: The Fernow Experimental Forest Long Term Soil Productivity (LTSP) Study at 13 years
Many temperate forests in the Eastern US are young and have experienced decades of elevated inputs of acidic compounds from the atmosphere. As a result, I used the Fernow Experimental Forest Long Term Soil Productivity (LTSP) experiment near Parsons, WV to determine how ongoing acidic deposition …
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On the Distribution of Genetic Variation in Ecological Communities
… been investigated by isolated disciplines (e.g. macroecology, comparative phylogeography, macroevolution) using tools and data that tend to focus on only one axis of community scale data (e.g. phylogenies, relative abundances, and/or trait information). Yet we know that there are feedbacks among …
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BUILDING FRAMEWORKS FOR UNDERSTANDING INVASIONS AND EXTINCTIONS FOR BIODIVERSITY SCIENCE
Scientists have long been interested in mechanisms that increase and decrease biodiversity on Earth and the effects they have on organisms’ interactions and functions. Global biodiversity loss is now outstripping accumulation and far exceeds expected background levels and has drawn comparisons to …
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COEXISTENCE, RESILIENCE AND RESISTANCE OF MARINE INVERTEBRATE COMMUNITIES ACROSS A LATITUDINAL GRADIENT
Biogeographic barriers have limit the movement of organisms, leading to speciation and shaping the development of unique regional biotas. Human-aided circumvention of biogeographic barriers, however, has increased the connectivity of isolated biotas, while changes in climate have been altering …
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Biotic interactions through a macroecological lens: biogeographic trends in parasitism rates and life history effects on the evolution of cooperation
Forming connections across trophic levels and environments, biotic interactions determine the flow of nutrients and energy in an ecosystem, their effects on fitness having the ability to shape species' ecology. Biotic interactions are also highly context-dependent, varying in strength in response …
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Examining neotropical primate community structure at regional and local scales : insights from taxonomic and phylogenetic approaches
<p>Understanding mechanisms underlying distribution of biodiversity remains a central issue in ecology. I integrate ecological and phylogenetic information at multiple spatial scales to better understand neotropical primate distribution and community structure. I investigate the variation within …
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The Effects of Dispersal on Macroecological Patterns
<p>Ecologists have long sought to uncover the mechanisms behind large-scale, macroecological patterns in the distribution and abundance of species. Macroecological patterns are often attributed to the dynamics of dispersal (e.g. dispersal limitation or widespread dispersal). However, few studies …
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Measuring and Forecasting Environmental Conditions From the Perspective of Rocky Intertidal Organisms
<p>Marine intertidal organisms live in a habitat that is characterized by acute environmental gradients determined by tides, waves, and weather. Models that incorporate these parameters can be used to predict and understand the distributions of organisms on both local and latitudinal scales. …
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The Influence of Environmental Change on Genetic Diversity Across Spatial and Taxonomic Scales
<p>The spatial distribution of genetic diversity is of interest to biodiversity scientists and conservationists and is a fundamental metric of biodiversity. Genetic diversity patterns across spatial and taxonomic scales contain information about population and assemblage dynamics that can convey …
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Diversität und Biogeographie der Farne und Vögel Boliviens: Niche Modellierung GIS Applicationen
Bei Vögeln und Farnen handelt es sich um die am wahrscheinlich besten untersuchten Taxa des Landes. Von daher bietet sich die Möglichkeit, an ihnen makroökologische und biogeographische Fragestellungen zu untersuchen. Das erste Kapitel behandelt einführend die gegenwärtigen Trends tropischer …
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