Evolution of microbial populations with spatial and environmental structure

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Evolution of microbial populations with spatial and environmental structure

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dc.contributor.advisor Meyers, Lauren Ancel
dc.creator Miller, Eric Louis
dc.date.accessioned 2011-01-07T20:11:12Z
dc.date.accessioned 2011-01-07T20:11:19Z
dc.date.available 2011-01-07T20:11:12Z
dc.date.available 2011-01-07T20:11:19Z
dc.date.created 2010-05
dc.date.issued 2011-01-07
dc.date.submitted May 2010
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2010-05-1018
dc.description.abstract Rarely are natural conditions constant, but generally biologists study microbes in artificially constant environments in the laboratory. I relaxed these assumptions of constant environments through time and space as I investigated how microbial populations evolve. First, I examined how bacteriophage evolved in the presence of permissive and nonpermissive hosts. I found that bacteriophage evolved discrimina- tion in mixed environments as well as in one of two environments with homogeneous, permissive hosts. This showed the asymmetry of host-shifting in viruses as well as the possibility of large, and somewhat unpredictable, pleiotropic effects. Secondly, I reconstructed ancestral environmental conditions for soil bacteria groups using phy- logenetics and environmental variables of extant species’ habitats. These generaliza- tions suggested characteristic phenotypes for several phylogenetic groups, including uncultured Acidobacteria. Lastly, I collected genetic sequences and global collection information for 65 bacteria genera across the domain. In examining the relation- ship between genetic distance, environmental conditions, and geography, I observed positive relationships specifically between genetic distance and geography or genetic distance and environmental conditions for bacteria from land sites but not from wa- ter sites. Phylogenic classifications or phenotypes of the genera could not predict these correlations. In all of these projects, variations in the environment created evolutionary signals that hinted at past environments of microbial populations.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Ecology
dc.subject Evolution
dc.subject Microbiology
dc.subject Experimental evolution
dc.subject Adsorption
dc.subject Antagonistic pleotropy
dc.subject T7
dc.subject Soil bacteria
dc.subject Bacteria
dc.subject Microbial ecology
dc.subject Phylogenetics
dc.subject Dispersal
dc.subject Biogeography
dc.subject 16S
dc.title Evolution of microbial populations with spatial and environmental structure
dc.date.updated 2011-01-07T20:11:19Z
dc.contributor.committeeMember Bennett, Philip C.
dc.contributor.committeeMember Bull, James J.
dc.contributor.committeeMember Hawkes, Christine V.
dc.contributor.committeeMember Hillis, David M.
dc.description.department Ecology, Evolution and Behavior
dc.type.genre thesis
dc.type.material text
thesis.degree.department Ecology, Evolution and Behavior
thesis.degree.discipline Ecology, Evolution, and Behavior
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy

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