High biodiversity in a benzene-degrading nitrate-reducing culture is sustained by a few primary consumers

Chrats Melkonian*, Lucas Fillinger, Siavash Atashgahi, Ulisses Nunes da Rocha, Esther Kuiper, Brett Olivier, Martin Braster, Willi Gottstein, Rick Helmus, John R. Parsons, Hauke Smidt, Marcelle van der Waals, Jan Gerritse, Bernd W. Brandt, Wilfred F.M. Röling, Douwe Molenaar, Rob J.M. van Spanning

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A key question in microbial ecology is what the driving forces behind the persistence of large biodiversity in natural environments are. We studied a microbial community with more than 100 different types of species which evolved in a 15-years old bioreactor with benzene as the main carbon and energy source and nitrate as the electron acceptor. Using genome-centric metagenomics plus metatranscriptomics, we demonstrate that most of the community members likely feed on metabolic left-overs or on necromass while only a few of them, from families Rhodocyclaceae and Peptococcaceae, are candidates to degrade benzene. We verify with an additional succession experiment using metabolomics and metabarcoding that these few community members are the actual drivers of benzene degradation. As such, we hypothesize that high species richness is maintained and the complexity of a natural community is stabilized in a controlled environment by the interdependencies between the few benzene degraders and the rest of the community members, ultimately resulting in a food web with different trophic levels.

Original languageEnglish
Article number530
JournalCommunications Biology
Volume4
Issue number1
DOIs
Publication statusPublished - 3 May 2021

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