The biological world is complex. Communities contain a multitude of interacting species, while populations contain extensive genetic variation. How much complexity must one consider to understand patterns and processes of interest? When are species interactions and community properties shaped by evolution? Conversely, when is evolution altered by community context? I test these questions in a series of experiments with simple microbial communities. The first data chapter investigates the impact of competition on the evolution of phage resistance in bacteria. This work demonstrates that community context can dramatically alter the evolution of resistance to phage. Next I tested the impact of evolution on assembly of a three species community. I demonstrate that evolution can influence the content of a microbial community by altering the process of assembly. Finally, I investigated the evolutionary origin and maintenance of cross-feeding mutualisms. This work suggests that species interactions can enable novel evolutionary pathways, and that evolution can significantly increase the productivity of cross-feeding communities. Jointly these experiments suggest that consideration of the interplay between ecological and evolutionary forces can provide insight into the complexity of the natural world. / text
| Identifer | oai:union.ndltd.org:UTEXAS/oai:repositories.lib.utexas.edu:2152/18406 |
| Date | 16 October 2012 |
| Creators | Harcombe, William Russell |
| Source Sets | University of Texas |
| Language | English |
| Detected Language | English |
| Format | electronic |
| Rights | Copyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works. |
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