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Consequences of Insect Flight Loss for Molecular Evolutionary Rates and Diversification

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dc.contributor.advisor Adamowicz, Sarah J. Mitterboeck, T. Fatima 2012-05-17 2012-05-25T15:49:45Z 2012-05-25T15:49:45Z 2012-05-25
dc.description.abstract This thesis investigates the molecular evolutionary and macroevolutionary consequences of flight loss in insects. Chapter 2 tests the hypothesis that flightless groups have smaller effective population sizes than related flighted groups, expected to result in a consistent pattern of increased non-synonymous to synonymous ratios in flightless lineages due to the greater effect of genetic drift in smaller populations. Chapter 3 tests the hypothesis that reduced dispersal and species-level traits such as range size associated with flightlessness increase extinction rates, which over the long term will counteract increased speciation rates in flightless lineages, leading to lower net diversification. The wide-spread loss of flight in insects has led to increased molecular evolutionary rates and is associated with decreased long-term net diversification. I demonstrate that the fundamental trait of dispersal ability has shaped two forms of diversity—molecular and species—in the largest group of animals, and that microevolutionary and macroevolutionary patterns do not necessarily mirror each other. en_US
dc.description.sponsorship Generously funded by NSERC with a Canada Graduate Scholarship and the Government of Ontario with an Ontario Graduate Scholarship to T. Fatima Mitterboeck; NSERC with a Discovery Grant to Dr. Sarah J. Adamowicz en_US
dc.language.iso en en_US
dc.rights.uri *
dc.subject evolution en_US
dc.subject flight en_US
dc.subject transitions en_US
dc.subject insects en_US
dc.subject molecular rates en_US
dc.subject diversification en_US
dc.subject flightless en_US
dc.subject flight loss en_US
dc.subject dispersal en_US
dc.subject holometabola en_US
dc.subject insect species en_US
dc.subject species richness en_US
dc.subject effective population size en_US
dc.subject population size en_US
dc.subject population subdivision en_US
dc.subject macroevolution en_US
dc.subject microevolution en_US
dc.subject comparative method en_US
dc.subject substitution rates en_US
dc.subject dN/dS ratios en_US
dc.subject non-synonymous substitutions en_US
dc.subject nearly neutral theory en_US
dc.subject molecular clock en_US
dc.subject mitochondrial DNA en_US
dc.subject nuclear DNA en_US
dc.subject OXPHOS en_US
dc.subject COI en_US
dc.subject COX1 en_US
dc.subject Cytochrome c oxidase subunit I en_US
dc.subject pterygota en_US
dc.subject speciation en_US
dc.subject extinction en_US
dc.subject whole-tree method en_US
dc.subject sister-group method en_US
dc.title Consequences of Insect Flight Loss for Molecular Evolutionary Rates and Diversification en_US
dc.type Thesis en_US Integrative Biology en_US Master of Science en_US Department of Integrative Biology en_US

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