AI Article Synopsis
- Carbon fixation by chemoautotrophic microorganisms in the dark ocean plays a crucial role in global carbon cycling, with nitrite-oxidizing bacteria from the Nitrospinae phylum being key players.
- Research shows that Nitrospinae are the most abundant nitrite-oxidizing bacteria found throughout the ocean, utilizing nitrite oxidation primarily for energy production.
- Evidence indicates that Nitrospinae are responsible for fixing 15 to 45% of inorganic carbon in the mesopelagic zone of the western North Atlantic, suggesting nitrite oxidation significantly influences the carbon cycle more than scientists previously thought.
Article Abstract
Carbon fixation by chemoautotrophic microorganisms in the dark ocean has a major impact on global carbon cycling and ecological relationships in the ocean's interior, but the relevant taxa and energy sources remain enigmatic. We show evidence that nitrite-oxidizing bacteria affiliated with the Nitrospinae phylum are important in dark ocean chemoautotrophy. Single-cell genomics and community metagenomics revealed that Nitrospinae are the most abundant and globally distributed nitrite-oxidizing bacteria in the ocean. Metaproteomics and metatranscriptomics analyses suggest that nitrite oxidation is the main pathway of energy production in Nitrospinae. Microautoradiography, linked with catalyzed reporter deposition fluorescence in situ hybridization, indicated that Nitrospinae fix 15 to 45% of inorganic carbon in the mesopelagic western North Atlantic. Nitrite oxidation may have a greater impact on the carbon cycle than previously assumed.
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| http://dx.doi.org/10.1126/science.aan8260 | DOI Listing |
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