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 333 for “"evolutionary history"”.
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Resolving Gnetum Evolutionary History
<em>Gnetum</em> are non-flowering seed plants of the tropics, indigenous to South America, Africa, and Asia. This group of about 40 species is fascinating to botanists because it shares distinctive morphological characteristics with flowering plants, such as broad leaves, woody stems, and …
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Evolutionary history and hybridization in Passerina buntings
… of speciation is of fundamental importance to evolutionary biology and hybrid zones offer unique natural laboratories in which to investigate the ecological and evolutionary processes important in creating and maintaining biological diversity. By comparing introgression patterns of different …
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The Evolutionary History of the Antarctic Flora
How long has the extant flora been present in the Antarctic? Glaciological reconstructions propose that most areas in Antarctica were covered by thick ice sheets throughout the Last Glacial Maximum (LGM; ~22-18 kya) as well as previous glaciations, suggesting terrestrial life must have been …
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Evolutionary History of Immunomodulatory Genes of Giant Viruses
… other NCLDV lineages, and if so, to analyze the evolutionary history of these genes. I identified 5 protein families of immunomodulatory genes that were found in both poxviruses and other NCLDV lineages, and I used phylogenetic tools to compare viral immunomodulatory genes of NCLDVs to their …
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Evolutionary history of the canary grasses (Phalaris, Poaceae)
… with the x=7 species indicating a complex history of chromosome evolution.
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The ecology and evolutionary history of the Deinococcaceae family
… tree reconciliation method to infer the evolutionary events that gave rise to the proto-Deinococcus. The ancestral reconstruction analysis indicated that the proto-Deinococcus underwent significant genome expansion by gaining 1000 gene families, which is about 50% of the genome size of …
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Evolutionary history and taxonomy of the titi monkeys (callicebinae)
… Callicebinae species and, consequently, the evolutionary history of this diverse clade remains poorly studied. The overall goal of this PhD dissertation is, therefore, to provide insight into the evolutionary and biogeographic history of the subfamily Callicebinae using DNA sequence data. To …
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Invasion and evolutionary history of a generalist fish parasite.
… destruens in tree of life, its mitochondrial DNA evolutionary history was also investigated to better decipher its phylogenetic position. Sphaerothecum destruens presence was confirmed in 90 % of the P. parva sampled populations from China, with a maximum prevalence of 10 %. Furthermore, the …
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Charting the Evolutionary History of the Bos Taurus Genome
*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation).
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Bridging the gap between microbial and metazoan evolutionary history
While microbial life originated early in Earth history and continues to underpin most modern ecosystems, its evolutionary trajectory remains murky. This is predominantly due to the dearth of diagnostic microbial fossils and biomarkers. Conversely, metazoans (animals) emerged relatively recently and …
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Untangling the evolutionary history of endogenous retroviruses in anuran genomes
… been described in this order. To untangle the evolutionary history of retroviruses and understand ERVs in non-mammalian genomes, this research explores ERV presence and diversity within and between anuran species. Through designing a similarity-based pipeline, 46 publicly available anuran …
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The Evolutionary History and Conservation of Speyeria Idalia (Lepidoptera: Nymphalidae)
Microsatellite data were concordant with previous analyses in that they indicated the Pennsylvania population was highly differentiated. Moreover, the greater resolution provided by microsatellites indicated the effects of recent habitat fragmentation for Midwestern populations when compared to …
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The Evolutionary History and Phylogeny of the Lithodinae (Decapoda: Anomura: Lithodidae)
… of pelagic larval<br/>stages; however, life-history changes allowed the subfamily Lithodinae to expand<br/>through the global deep sea, where they are now living at the frontier of their lower<br/>temperature threshold in the Southern Ocean. Phylogenies indicate the importance …
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Ancestry-based Methods for Characterizing the Evolutionary History of Admixed Populations
… patterns of genetic ancestry to investigate the evolutionary history of admixed populations. First, I develop a suite of ancestry-based summary statistics and computational methods to detect post-admixture adaptation, and demonstrate their application in a case study of human adaptation to …
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Application of Chromosome Mapping to Understanding Evolutionary History of Anopheles Species
… changes that underlie evolving traits. These evolutionary changes can be related to the gain or loss of human blood choice or to other epidemiologically important traits. In order to understand the phylogenetic relationships and evolutionary history of the members of the An. gambiae complex, …
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Evolutionary History and Genetic Conservation of Fraser Fir (Abies fraseri [Pursh] Poir.)
… likely a function of its post-glacial migratory history. Unexpectedly, some of the smallest Fraser fir populations were the most genetically diverse by some measures, and the largest and least isolated populations were among the least diverse. Using the same microsatellite loci, I detected a …
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The Last Stand of Angraecum: Biogeographic and Evolutionary History of Darwin's Muses
… the exploration of its biogeographical and evolutionary history. While the evolutionary history of subtribe Angraecinae has recently been addressed by numerous authors, its biogeographical history has only been studied for a limited number of areas within its full geographic distribution …
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Resolving the evolutionary history of multiple groups of freshwater mussels (Bivalvia : Unionidae).
… in this group is strongly shaped by a life history strategy that includes an obligate parasitic larval stage. Alarmingly, anthropogenic alterations to freshwater ecosystems have disproportionately impacted mussels as a group, resulting in freshwater mussels being one of the most imperiled …
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Genetic inference of deep hominin evolutionary history using the sequentially Markovian coalescent
… allowed researchers to infer human demographic history with unprecedented resolution. Of particular interest are the series of population size changes, admixture events, and adaptations that have occurred over time. Many methods that infer these quantities rely on differences in the distribution …
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