Abstract:
:The history of the Earth has been marked by major ecological transitions, driven by metabolic innovation, that radically reshaped the composition of the oceans and atmosphere. The nature and magnitude of the earliest transitions, hundreds of million years before photosynthesis evolved, remain poorly understood. Using a novel ecosystem-planetary model, we find that pre-photosynthetic methane-cycling microbial ecosystems are much less productive than previously thought. In spite of their low productivity, the evolution of methanogenic metabolisms strongly modifies the atmospheric composition, leading to a warmer but less resilient climate. As the abiotic carbon cycle responds, further metabolic evolution (anaerobic methanotrophy) may feed back to the atmosphere and destabilize the climate, triggering a transient global glaciation. Although early metabolic evolution may cause strong climatic instability, a low CO:CH4 atmospheric ratio emerges as a robust signature of simple methane-cycling ecosystems on a globally reduced planet such as the late Hadean/early Archean Earth.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Sauterey B,Charnay B,Affholder A,Mazevet S,Ferrière Rdoi
10.1038/s41467-020-16374-7subject
Has Abstractpub_date
2020-06-01 00:00:00pages
2705issue
1issn
2041-1723pii
10.1038/s41467-020-16374-7journal_volume
11pub_type
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