Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-017-01376-9
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Funding
- US Department of Energy (DOE) - Office of Science of US DOE [DE-AC02-05CH11231]
- National Science Foundation [OCE-1232982]
- G. Unger Vetlesen Foundation
- Ambrose Monell Foundation
- Tula Foundation
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- Canadian Institute for Advanced Research
- US National Science Foundation [OCE-1232982]
- NSERC
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
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Microbial communities drive biogeochemical cycles through networks of metabolite exchange that are structured along energetic gradients. As energy yields become limiting, these networks favor co-metabolic interactions to maximize energy disequilibria. Here we apply single-cell genomics, metagenomics, and metatranscriptomics to study bacterial populations of the abundant microbial dark matter phylum Marinimicrobia along defined energy gradients. We show that evolutionary diversification of major Marinimicrobia clades appears to be closely related to energy yields, with increased co-metabolic interactions in more deeply branching clades. Several of these clades appear to participate in the biogeochemical cycling of sulfur and nitrogen, filling previously unassigned niches in the ocean. Notably, two Marinimicrobia clades, occupying different energetic niches, express nitrous oxide reductase, potentially acting as a global sink for the greenhouse gas nitrous oxide.
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