Stratified prokaryote network in the oxic-anoxic transition of a deep-sea halocline

Daniele Daffonchio*, Sara Borin, Tullio Brusa, Lorenzo Brusetti, Paul W.J.J. Van Der Wielen, Henk Bolhuis, Michail M. Yakimov, Giuseppe D'Auria, Laura Giuliano, Danielle Marty, Christian Tamburini, Terry J. McGenity, John E. Hallsworth, Andrea M. Sass, Kenneth N. Timmis, Anastasios Tselepides, Gert J. De Lange, Andreas Hübner, John Thomson, Soterios P. VarnavasFrancesco Gasparoni, Hans W. Gerber, Elisa Malinverno, Cesare Corselli, Jean Garcin, Boyd McKew, Peter N. Golyshin, Nikolaos Lampadariou, Paraskevi Polymenakou, Daniele Calore, Stefano Cenedese, Fabio Zanon, Sven Hoog

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

147 Scopus citations


The chemical composition of the Bannock basin has been studied in some detail1,2. We recently showed that unusual microbial populations, including a new division of Archaea (MSBL1)3, inhabit the NaCl-rich hypersaline brine. High salinities tend to reduce biodiversity4, but when brines come into contact with fresher water the natural haloclines formed frequently contain gradients of other chemicals, including permutations of electron donors and acceptors, that may enhance microbial diversity, activity and biogeochemical cycling5,6. Here we report a 2.5-m-thick chemocline with a steep NaCl gradient at 3.3 km within the water column betweeen Bannock anoxic hypersaline brine7 and overlying sea water. The chemocline supports some of the most biomass-rich and active microbial communities in the deep sea, dominated by Bacteria rather than Archaea, and including four major new divisions of Bacteria. Significantly higher metabolic activities were measured in the chemocline than in the overlying sea water and underlying brine; functional analyses indicate that a range of biological processes is likely to occur in the chemocline. Many prokaryotic taxa, including the phylogenetically new groups, were confined to defined salinities, and collectively formed a diverse, sharply stratified, deep-sea ecosystem with sufficient biomass to potentially contribute to organic geological deposits.

Original languageEnglish (US)
Pages (from-to)203-207
Number of pages5
Issue number7081
StatePublished - Mar 9 2006

ASJC Scopus subject areas

  • General


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