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Electrotrophy as potential primary metabolism for colonization of conductive surfaces in deep-sea hydrothermal chimneys

Abstract : Deep-sea hydrothermal vents are extreme and complex ecosystems based on a trophic chain. We are still unsure of the first colonizers of these environments and their metabolism, but they are thought to be (hyper)thermophilic autotrophs. Here we investigate whether the electric potential observed across hydrothermal chimneys could serve as an energy source for these first colonizers. Experiments were performed in a two-chamber microbial electrochemical system inoculated with deep-sea hydrothermal chimney samples, with a cathode as sole electron donor, CO2 as sole carbon source, and three different electron acceptors (nitrate, sulfate, and oxygen). After a few days of culture, all three experiments showed growth of an electrotrophic biofilm consuming directly or indirectly the electrons and producing organic compounds including acetate, glycerol, preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission.
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https://hal-amu.archives-ouvertes.fr/hal-03022667
Contributor : Patricia Bonin <>
Submitted on : Tuesday, November 24, 2020 - 10:14:56 PM
Last modification on : Tuesday, March 30, 2021 - 12:26:06 PM
Long-term archiving on: : Thursday, February 25, 2021 - 9:17:17 PM

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Guillaume Pillot, Sylvain Davidson, Laetitia Shintu, Oulfat Amin, Anne Godfroy, et al.. Electrotrophy as potential primary metabolism for colonization of conductive surfaces in deep-sea hydrothermal chimneys. 2020. ⟨hal-03022667⟩

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