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Photosynthesis‐driven methane production in oxic lake water as an important contributor to methane emission

MARCO GUNTHEL, Isabell Klawonn, Jason Woodhouse, Mina Bižić, Danny Ionescu, Lars Ganzert Orcid Logo, Steffen Kümmel, Ivonne Nijenhuis Orcid Logo, Luca Zoccarato, Hans‐Peter Grossart Orcid Logo, Kam Tang Orcid Logo

Limnology and Oceanography, Volume: 65, Issue: 12, Pages: 2853 - 2865

Swansea University Authors: MARCO GUNTHEL, Kam Tang Orcid Logo

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DOI (Published version): 10.1002/lno.11557

Abstract

The discovery of methane production in oxic waters challenges the paradigm of strict anoxic requirement for biological methanogenesis. We usd field measurements and incubation experiments to show that oxic-water CH4 production occurred in Lake Stechlin was associated with phytoplankton especially di...

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Published in: Limnology and Oceanography
ISSN: 0024-3590 1939-5590
Published: Wiley 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54500
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Abstract: The discovery of methane production in oxic waters challenges the paradigm of strict anoxic requirement for biological methanogenesis. We usd field measurements and incubation experiments to show that oxic-water CH4 production occurred in Lake Stechlin was associated with phytoplankton especially diatoms, cyanobacteria, green algae and cryptophytes. Using 13C-labeling techniques we showed that bicarbonate was converted to CH4, and the production exceeded oxidation during daytime. These experimental and field data together indicate a clear link between photosynthesis and oxic CH4 production. Our results suggest that the oxic CH4 source significantly contributed to surface emission in Lake Stechlin, and call for re-examination of the aquatic CH4 cycle and climate predictions.
Keywords: oxic methane source, photosynthesis, phosphorus, atmospheric CH4 emission, lakes
College: Faculty of Science and Engineering
Issue: 12
Start Page: 2853
End Page: 2865

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