Search for dissertations about: "phylogenetic comparative methods"
Showing result 1 - 5 of 13 swedish dissertations containing the words phylogenetic comparative methods.
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1. Multivariate Aspects of Phylogenetic Comparative Methods
Abstract : his thesis concerns multivariate phylogenetic comparative methods. We investigate two aspects of them. The first is the bias caused by measurement error in regression studies of comparative data. We calculate the formula for the bias and show how to correct for it. READ MORE
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2. Stochastic Models in Phylogenetic Comparative Methods: Analytical Properties and Parameter Estimation
Abstract : Phylogenetic comparative methods are well established tools for using inter-species variation to analyse phenotypic evolution and adaptation. They are generally hampered, however, by predominantly univariate approaches and failure to include uncertainty and measurement error in the phylogeny as well as the measured traits. READ MORE
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3. Adaptation and Constraint in the Plant Reproductive Phase
Abstract : Conservatism is a central theme of organismic evolution. Related species share characteristics due to their common ancestry. Some concern have been raised among evolutionary biologists, whether such conservatism is an expression of natural selection or of a constrained ability to adapt. READ MORE
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4. Uncertainty Estimation in Models of Multivariate Trait Evolution on Given Phylogenies
Abstract : Phylogenetic comparative methods are a set of statistical methods that model the evolutionary history of species, especially in the context where one has data on certain traits of related extant species that have evolved over a phylogenetic tree in accordance to an underlying stochastic process. This thesis presents a Hessian-based closed-form asymptotic confidence region that covers a wide family of Gaussian continuous-trait evolution models; the result has been implemented in an R package. READ MORE
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5. Exploration of microbial diversity and evolution through cultivation independent phylogenomics
Abstract : Our understanding of microbial evolution is largely dependent on available genomic data of diverse organisms. Yet, genome-sequencing efforts have mostly ignored the diverse uncultivable majority in favor of cultivable and sociologically relevant organisms. READ MORE