Ecotype partitioning and metabolic diversity within Thaumarchaeota populations in the coastal ocean
Abstract/Contents
- Abstract
- The discovery of ammonia oxidation within the domain Archaea caused a paradigm shift in our understanding of the global nitrogen cycle. Ammonia-oxidizing archaea (AOA) of the phylum Thaumarchaeota are now recognized as an abundant and ubiquitous archaeal group that plays a critical role in the global nitrogen and carbon cycles. As chemolithoautotrophs, AOA fix CO2 using the energy derived from oxidizing ammonia to nitrite, and have been shown to carry out the majority of ammonia oxidation in the marine environment. Despite the important biogeochemical consequences of their metabolism, large gaps remain in our understanding of the ecology of this abundant archaeal group. Functional gene-based marine water column surveys have suggested the diversification of AOA into ecologically distinct phylotypes (or ecotypes). These ecotypes are thought to represent subpopulations occupying differential niche spaces in the pelagic realm. In this dissertation, I examine the ecology of marine Thaumarchaeota, particularly in relation to the depth-related diversification patterns. I use a time-series microbial community dataset generated from the Monterey Bay upwelling system to investigate phylogenetic and metabolic diversity within pelagic thaumarchaeal populations. I discuss the relative utility of different molecular markers for characterizing intra-clade diversity within pelagic AOA. Association patterns of subpopulations are examined using modeling approaches, which reveal biogeochemically-relevant differences in the co-occurrence relationships of ecotype groups. Phylogenetic and metabolic diversity within thaumarchaeal sub-lineages are discussed based on population genomes reconstructed from metagenomes. Overall, this dissertation highlights previously unrecognized microscale diversity and metabolic adaptations within marine Thaumarchaeota.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Reji, Linta |
|---|---|
| Degree supervisor | Francis, Christopher |
| Thesis advisor | Francis, Christopher |
| Thesis advisor | Casciotti, Karen Lynn, 1974- |
| Thesis advisor | Dekas, Anne |
| Degree committee member | Casciotti, Karen Lynn, 1974- |
| Degree committee member | Dekas, Anne |
| Associated with | Stanford University, Department of Environmental Earth System Science. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Linta Reji. |
|---|---|
| Note | Submitted to the Department of Environmental Earth System Science. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Linta Reji
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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