Microbial community structure in hadal sediments: high similarity along trench axes and strong changes along redox gradients. - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue The International Society of Microbiologial Ecology Journal Année : 2021

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

Résumé

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 1cm. 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 ofother 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.
Fichier principal
Vignette du fichier
schau1 (1).pdf (2.18 Mo) Télécharger le fichier
Origine Publication financée par une institution

Dates et versions

hal-03415694 , version 1 (08-11-2021)

Licence

Identifiants

Citer

Clemens Schauberger, Ronnie N. Glud, Bela Hausmann, Blandine Trouche, Lois Maignien, et al.. Microbial community structure in hadal sediments: high similarity along trench axes and strong changes along redox gradients.. The International Society of Microbiologial Ecology Journal, In press, ⟨10.1038/s41396-021-01021-w⟩. ⟨hal-03415694⟩
130 Consultations
109 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More