Journal
SCIENCE ADVANCES
Volume 6, Issue 3, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aax5343
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Funding
- DFG-Aquameth project [GR1540-21-1]
- BMBF-BIBS project [01LC1501G]
- Human Frontiers Science project (HFSP) [2039371]
- DFG eigene Stelle project [BI 1987/2-1]
- train-the-trainer exchange program of the German Academic Exchange Service (DAAD)
- German Research Foundation (DFG) [KE 884/8-2, KE 884/11-1, KE 884/16-2]
- ESF
- Ministry of Education, Science and Culture of Mecklenburg-Western Pomerania project WETSCAPES [ESF/14-BM-A55-0032/16]
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Evidence is accumulating to challenge the paradigm that biogenic methanogenesis, considered a strictly anaerobic process, is exclusive to archaea. We demonstrate that cyanobacteria living in marine, freshwater, and terrestrial environments produce methane at substantial rates under light, dark, oxic, and anoxic conditions, linking methane production with light-driven primary productivity in a globally relevant and ancient group of photoautotrophs. Methane production, attributed to cyanobacteria using stable isotope labeling techniques, was enhanced during oxygenic photosynthesis. We suggest that the formation of methane by cyanobacteria contributes to methane accumulation in oxygen-saturated marine and limnic surface waters. In these environments, frequent cyanobacterial blooms are predicted to further increase because of global warming potentially having a direct positive feedback on climate change. We conclude that this newly identified source contributes to the current natural methane budget and most likely has been producing methane since cyanobacteria first evolved on Earth.
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