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

Daffonchio, D and Borin, S and Brusa, T and Brusetti, L and Van Der Wielen, PWJJ and Bolhuis, H and Yakimov, MM and D'Auria, G and Giuliano, L and Marty, D and Tamburini, C and McGenity, TJ and Hallsworth, JE and Sass, AM and Timmis, KN and Tselepides, A and De Lange, GJ and Hübner, A and Thomson, J and Varnavas, SP and Gasparoni, F and Gerber, HW and Malinverno, E and Corselli, C and Garcin, J and McKew, B and Golyshin, PN and Lampadariou, N and Polymenakou, P and Calore, D and Cenedese, S and Zanon, F and Hoog, S (2006) 'Stratified prokaryote network in the oxic-anoxic transition of a deep-sea halocline.' Nature, 440 (7081). 203 - 207. ISSN 0028-0836

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Abstract

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. © 2006 Nature Publishing Group.

Item Type: Article
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 08 Jul 2015 10:02
Last Modified: 06 Feb 2019 02:15
URI: http://repository.essex.ac.uk/id/eprint/14254

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