Microbial community structure in hadal sediments: high similarity along trench axes and strong changes along redox gradients

Type Article
Acceptance Date 2021 IN PRESS
Language English
Author(s) Schauberger ClemensORCID1, Glud Ronnie N.ORCID1, 2, 3, Hausmann BelaORCID4, 5, Trouche BlandineORCID6, Maignien LoisORCID6, Poulain JulieORCID7, Wincker PatrickORCID7, Arnaud-Haond SophieORCID8, Wenzhöfer FrankORCID9, 10, Thamdrup BoORCID1
Affiliation(s) 1 : Hadal & Nordcee, Department of Biology, University of Southern Denmark, Odense, Denmark
2 : Department of Ocean and Environmental Sciences, Tokyo University of Marine Science and Technology, Tokyo, Japan
3 : Danish Institute of Advanced Study (DIAS), University of Southern Denmark, Odense, Denmark
4 : Joint Microbiome Facility of the Medical University of Vienna and the University of Vienna, Vienna, Austria
5 : Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
6 : Univ Brest, CNRS, IFREMER, Microbiology of Extreme Environments Laboratory, Plouzané, France
7 : Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ Evry, Université Paris-Saclay, Evry, France
8 : MARBEC, Institut Français de Recherche pour L’Exploitation de la Mer, Univ Montpellier, CNRS, IRD, Sète, France
9 : Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
10 : Max Planck Institute for Marine Microbiology and Ecology, Bremen, Germany
Source The ISME Journal (1751-7362) (Springer Science and Business Media LLC) In Press
DOI 10.1038/s41396-021-01021-w
Keyword(s) Biogeochemistry, Microbial ecology, Microbiome, Water microbiology
Abstract

Hadal trench sediments are hotspots of biogeochemical activity in the deep sea, but the biogeochemical and ecological factors that shape benthic hadal microbial communities remain unknown. Here, we sampled ten hadal sites from two trench regions with a vertical resolution of down to 1 cm. We sequenced 16S rRNA gene amplicons using universal and archaea-specific primer sets and compared the results to biogeochemical parameters. Despite bathymetric and depositional heterogeneity we found a high similarity of microbial communities within each of the two trench axes, while composition at the phylum level varied strongly with sediment depth in conjunction with the redox stratification into oxic, nitrogenous, and ferruginous zones. As a result, communities of a given sediment horizon were more similar to each other across a distance of hundreds of kilometers within each trench, than to those of adjacent horizons from the same sites separated only by centimeters. Total organic carbon content statistically only explained a small part of the variation within and between trenches, and did not explain the community differences observed between the hadal and adjacent shallower sites. Anaerobic taxa increased in abundance at the top of the ferruginous zone, seeded by organisms deposited at the sediment surface and surviving burial through the upper redox zones. While an influence of other potential factors such as geographic isolation, hydrostatic pressure, and non-steady state depositional regimes could not be discerned, redox stratification and diagenesis appear to be the main selective forces that structure community composition in hadal sediments.

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Schauberger Clemens, Glud Ronnie N., Hausmann Bela, Trouche Blandine, Maignien Lois, Poulain Julie, Wincker Patrick, Arnaud-Haond Sophie, Wenzhöfer Frank, Thamdrup Bo Microbial community structure in hadal sediments: high similarity along trench axes and strong changes along redox gradients. The ISME Journal IN PRESS. Publisher's official version : https://doi.org/10.1038/s41396-021-01021-w , Open Access version : https://archimer.ifremer.fr/doc/00699/81144/