Spatial patterns of microbial diversity in Fe-Mn deposits and associated sediments in the Atlantic and Pacific oceans

A - Papers appearing in refereed journals

Bergo, N. M., Torres-Ballesteros, A., Signori, C. N., Benites, M., Jovane, L., Murton, B. J., Da Rocha, U. N. and Pellizari, V. H. 2022. Spatial patterns of microbial diversity in Fe-Mn deposits and associated sediments in the Atlantic and Pacific oceans. Science of the Total Environment. 837 (1 Sept), p. 155792. https://doi.org/10.1016/j.scitotenv.2022.155792

AuthorsBergo, N. M., Torres-Ballesteros, A., Signori, C. N., Benites, M., Jovane, L., Murton, B. J., Da Rocha, U. N. and Pellizari, V. H.
Abstract

Mining of deep-sea Fe-Mn deposits will remove crusts and nodules from the seafloor. The growth of these minerals takes millions of years, yet little is known about their microbiome. Besides being key elements of the biogeochemical cycles and essential links of food and energy to deep-sea, microbes have been identified to affect manganese oxide formation. In this study, we determined the composition and diversity of Bacteria and Archaea in deep-sea Fe-Mn crusts, nodules, and associated sediments from two areas in the Atlantic Ocean, the Tropic Seamount and the Rio Grande Rise. Samples were collected using ROV and dredge in 2016 and 2018 oceanographic campaigns, and the 16S rRNA gene was sequenced using Illumina platform. Additionally, we compared our results with microbiome data of Fe-Mn crusts, nodules, and sediments from Clarion-Clipperton Zone and Takuyo-Daigo Seamount in the Pacific Ocean. We found that Atlantic seamounts harbor an unusual and unknown Fe-Mn deposit microbiome with lower diversity and richness compared to Pacific areas. Crusts and nodules from Atlantic seamounts have unique taxa (Alteromonadales, Nitrospira, and Magnetospiraceae) and a higher abundance of potential metal-cycling bacteria, such as Betaproteobacteriales and Pseudomonadales. The microbial beta-diversity from Atlantic seamounts was clearly grouped into microhabitats according to sediments, crusts, nodules, and geochemistry. Despite the time scale of million years for these deposits to grow, a combination of environmental settings played a significant role in shaping the microbiome of crusts and nodules. Our results suggest that microbes of Fe-Mn deposits are key in biogeochemical reactions in deep-sea ecosystems. These findings demonstrate the importance of microbial community analysis in environmental baseline studies for areas within the potential of deep-sea mining.

KeywordsDeep-sea ferromanganese crusts and nodules ; Microbial diversity; Biogeochemical cycling; Rio Grande RIse; Tropic Seamount
Year of Publication2022
JournalScience of the Total Environment
Journal citation837 (1 Sept), p. 155792
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2022.155792
Web address (URL)https://doi.org/10.1016/j.scitotenv.2022.155792
Open accessPublished as non-open access
FunderNatural Environment Research Council
Output statusPublished
Publication dates
Online10 May 2022
Publication process dates
Accepted04 May 2022
PublisherElsevier Science Bv
ISSN0048-9697

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