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Publication . Other literature type . Preprint . 2020

Microbial communities associated with sediments and polymetallic nodules of the Peru Basin

Massimiliano Molari; Felix Janssen; Tobias R. Vonnahme; Frank Wenzhöfer; Antje Boetius;
Open Access
Published: 03 Feb 2020
Publisher: Copernicus GmbH
Abstract

Industrial-scale mining of deep-sea polymetallic nodules will need to remove nodules in large areas of the seafloor. The regrowth of the nodules by metal precipitation is estimated to take millions of years. Thus for future mining impact studies, it is crucial to understand the role of nodules in shaping microbial diversity and function in deep-sea environments. Here we investigated microbial community composition based on 16S rRNA gene sequences retrieved from sediments and nodules of the Peru Basin (> 4100 m water depth). The nodule field of the Peru Basin showed a typical deep-sea microbiome, with dominance of the classes Gammaproteobacteria, Alphaproteobacteria, Deltaproteobacteria, and Acidimicrobiia. Nodules and sediments host distinct bacterial and archaeal communities, with nodules showing lower diversity and a higher proportion of sequences related to potential metal-cycling bacteria (i.e. Magnetospiraceae, Hyphomicrobiaceae), bacterial and archaeal nitrifiers (i.e. AqS1, unclassified Nitrosomonadaceae, Nitrosopumilus, Nitrospina, Nitrospira), and bacterial sequences found in ocean crust, nodules, hydrothermal deposits and sessile fauna. Sediment and nodule communities overall shared a low proportion of Operational Taxonomic Units (OTU; 21 % for Bacteria and 19 % for Archaea). Our results show that nodules represent a specific ecological niche (i.e. hard substrate, high metal concentrations and sessile fauna), with a potentially relevant role in organic carbon degradation. Differences in nodule community composition (e.g. Mn-cycling bacteria, nitrifiers) between the Clarion-Clipperton Fracture Zone (CCZ) and the Peru Basin suggest that changes in environmental setting (i.e. sedimentation rates) play also a significant role in structuring the nodule microbiome.

Subjects by Vocabulary

Microsoft Academic Graph classification: Nitrospira biology.organism_classification biology Deltaproteobacteria Nitrosopumilus Archaea Gammaproteobacteria Alphaproteobacteria Ecology Microbial population biology Dominance (ecology)

Related to Research communities
European Marine Science
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Biogeosciences (BG)
Other literature type . 2020
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