Stable aerobic and anaerobic coexistence in anoxic marine zones
Mechanistic description of the transition from aerobic to anaerobic metabolism is necessary for diagnostic and predictive modeling of fixed nitrogen loss in anoxic marine zones (AMZs). In a metabolic model where diverse oxygen- and nitrogen-cycling microbial metabolisms are described by underlying r...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2020
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| Online Access: | https://hdl.handle.net/1721.1/125317 |
| _version_ | 1826212430756184064 |
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| author | Zakem, Emily Juliette Mahadevan, Amala Lauderdale, Jonathan Follows, Michael J |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Zakem, Emily Juliette Mahadevan, Amala Lauderdale, Jonathan Follows, Michael J |
| author_sort | Zakem, Emily Juliette |
| collection | MIT |
| description | Mechanistic description of the transition from aerobic to anaerobic metabolism is necessary for diagnostic and predictive modeling of fixed nitrogen loss in anoxic marine zones (AMZs). In a metabolic model where diverse oxygen- and nitrogen-cycling microbial metabolisms are described by underlying redox chemical reactions, we predict a transition from strictly aerobic to predominantly anaerobic regimes as the outcome of ecological interactions along an oxygen gradient, obviating the need for prescribed critical oxygen concentrations. Competing aerobic and anaerobic metabolisms can coexist in anoxic conditions whether these metabolisms represent obligate or facultative populations. In the coexistence regime, relative rates of aerobic and anaerobic activity are determined by the ratio of oxygen to electron donor supply. The model simulates key characteristics of AMZs, such as the accumulation of nitrite and the sustainability of anammox at higher oxygen concentrations than denitrification, and articulates how microbial biomass concentrations relate to associated water column transformation rates as a function of redox stoichiometry and energetics. Incorporating the metabolic model into an idealized two-dimensional ocean circulation results in a simulated AMZ, in which a secondary chlorophyll maximum emerges from oxygen-limited grazing, and where vertical mixing and dispersal in the oxycline also contribute to metabolic co-occurrence. The modeling approach is mechanistic yet computationally economical and suitable for global change applications. |
| first_indexed | 2024-09-23T15:21:15Z |
| format | Article |
| id | mit-1721.1/125317 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:21:15Z |
| publishDate | 2020 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1253172022-10-02T02:26:50Z Stable aerobic and anaerobic coexistence in anoxic marine zones Zakem, Emily Juliette Mahadevan, Amala Lauderdale, Jonathan Follows, Michael J Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Woods Hole Oceanographic Institution Mechanistic description of the transition from aerobic to anaerobic metabolism is necessary for diagnostic and predictive modeling of fixed nitrogen loss in anoxic marine zones (AMZs). In a metabolic model where diverse oxygen- and nitrogen-cycling microbial metabolisms are described by underlying redox chemical reactions, we predict a transition from strictly aerobic to predominantly anaerobic regimes as the outcome of ecological interactions along an oxygen gradient, obviating the need for prescribed critical oxygen concentrations. Competing aerobic and anaerobic metabolisms can coexist in anoxic conditions whether these metabolisms represent obligate or facultative populations. In the coexistence regime, relative rates of aerobic and anaerobic activity are determined by the ratio of oxygen to electron donor supply. The model simulates key characteristics of AMZs, such as the accumulation of nitrite and the sustainability of anammox at higher oxygen concentrations than denitrification, and articulates how microbial biomass concentrations relate to associated water column transformation rates as a function of redox stoichiometry and energetics. Incorporating the metabolic model into an idealized two-dimensional ocean circulation results in a simulated AMZ, in which a secondary chlorophyll maximum emerges from oxygen-limited grazing, and where vertical mixing and dispersal in the oxycline also contribute to metabolic co-occurrence. The modeling approach is mechanistic yet computationally economical and suitable for global change applications. United States. Office of Naval Research (Grant ONR N000-14-15-1-2555) National Science Foundation (U.S.) (Grant OCE-1259388) Gordon and Betty Moore Foundation (Grant GBMF 3778) Simons Foundation. Simons Collaboration on Ocean Processes and Ecology (Grant SCOPE 329108) Simons Foundation. Simons Collaboration on Computational Biogeochemical Modeling of Marine Ecosystems (Grant CBIOMES 549931) 2020-05-19T16:29:01Z 2020-05-19T16:29:01Z 2019-10 2020-04-17T18:10:59Z Article http://purl.org/eprint/type/JournalArticle 1751-7370 1751-7362 https://hdl.handle.net/1721.1/125317 Zakem, Emily J. et al. “Stable aerobic and anaerobic coexistence in anoxic marine zones.” The ISME Journal 14 (2019): 288-301 © 2019 The Author(s) en 10.1038/S41396-019-0523-8 The ISME Journal Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC ISME Journal |
| spellingShingle | Zakem, Emily Juliette Mahadevan, Amala Lauderdale, Jonathan Follows, Michael J Stable aerobic and anaerobic coexistence in anoxic marine zones |
| title | Stable aerobic and anaerobic coexistence in anoxic marine zones |
| title_full | Stable aerobic and anaerobic coexistence in anoxic marine zones |
| title_fullStr | Stable aerobic and anaerobic coexistence in anoxic marine zones |
| title_full_unstemmed | Stable aerobic and anaerobic coexistence in anoxic marine zones |
| title_short | Stable aerobic and anaerobic coexistence in anoxic marine zones |
| title_sort | stable aerobic and anaerobic coexistence in anoxic marine zones |
| url | https://hdl.handle.net/1721.1/125317 |
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