Anammox bacterial populations in deep marine hypersaline gradient systems |
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Authors: | Sara Borin Francesca Mapelli Eleonora Rolli Bongkeun Song Craig Tobias Markus C Schmid Gert J De Lange Gert J Reichart Stefan Schouten Mike Jetten Daniele Daffonchio |
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Institution: | 1. Department of Food, Environmental and Nutritional Sciences, DeFENS, Università degli Studi di Milano, Via Celoria 2, 20133, Milan, Italy 2. Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC, 28409, USA 3. Department of Marine Sciences, University of Connecticut, Greoton, CT, 06340, USA 4. Department of Microbiology, IWWR, Radboud University Nijmegen, 6500 HC, Nijmegen, The Netherlands 7. Department of Microbial Ecology, University of Vienna, Vienna, Austria 5. Faculty of Geosciences, Geochemistry, Utrecht University, Utrecht, The Netherlands 6. Department of Marine Organic Biochemistry, Royal Netherlands Institute for Sea Research (NIOZ), AB Den Burg, Texel, The Netherlands
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Abstract: | To extend the knowledge of anaerobic ammonium oxidation (anammox) habitats, bacterial communities were examined in two hypersaline sulphidic basins in Eastern Mediterranean Sea. The 2 m thick seawater–brine haloclines of the deep anoxic hypersaline basins Bannock and L’Atalante were sampled in intervals of 10 cm with increasing salinity. 15N isotope pairing incubation experiments showed the production of 29N2 and 30N2 gases in the chemoclines, ranging from 6.0 to 9.2 % salinity of the L’Atalante basin. Potential anammox rates ranged from 2.52 to 49.65 nmol N2 L?1 day?1 while denitrification was a major N2 production pathway, accounting for more than 85.5 % of total N2 production. Anammox-related 16S rRNA genes were detected along the L’Atalante and Bannock haloclines up to 24 % salinity, and the amplification of the hydrazine synthase genes (hzsA) further confirmed the presence of anammox bacteria in Bannock. Fluorescence in situ hybridisation and sequence analysis of 16S rRNA genes identified representatives of the marine anammox genus ‘Candidatus Scalindua’ and putatively new operational taxonomic units closely affiliated to sequences retrieved in marine environments that have documented anammox activity. ‘Scalindua brodae’ like sequences constituted up to 84.4 % of the sequences retrieved from Bannock. The anammox community in L’Atalante was different than in Bannock and was stratified according to salinity increase. This study putatively extends anammox bacterial habitats to extremely saline sulphidic ecosystems. |
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