Inverted microbial community stratification and spatial–temporal stability in hypersaline anaerobic sediments from the S’Avall solar salterns |
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| Institution: | 1. Marine Microbiology Group, Department of Animal and Microbial Biodiversity, Mediterranean Institute for Advanced Studies (IMEDEA UIB-CSIC), Esporles, Spain;2. Department of Physiology, Genetics and Microbiology, Universidad de Alicante, Alicante, Spain;1. Winogradsky Institute of Microbiology, Research Centre of Biotechnology, Russian Academy of Sciences, Moscow, Russia;2. Department of Biotechnology, TU Delft, The Netherlands;3. Immanuel Kant Baltic Federal University, Kaliningrad, Russia;4. Department of Marine Microbiology and Biogeochemistry, NIOZ Netherlands Institute for Sea Research, and Utrecht University, The Netherlands;5. Department of Earth Sciences – Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands;1. Pacific Northwest National Laboratory, Richland, WA, USA;2. Department of Chemistry, Washington State University, Pullman, WA, USA;1. Ufa Institute of Biology, Ufa Federal Research Centre, Russian Academy of Sciences, Prospekt Oktyabrya, 69, 450054, Ufa, Russia;2. Winogradsky Institute of Microbiology, Research Center of Biotechnology RAS, Leninsky prospect 33/2, 119071, Moscow, Russia;3. Kurchatov Center for Genome Research, NRC “Kurchatov Institute”, Ac. Kurchatov square, 1, 123098, Moscow, Russia;4. Shirshov Institute of Oceanology, Russian Academy of Sciences, 36, Nahimovskiy prospekt, Moscow, 117997, Russia;5. Immanuel Kant Baltic Federal University, 14, Nevskogo str., Kaliningrad, 236016, Russia |
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| Abstract: | The anaerobic hypersaline sediments of an ephemeral pond from the S’Avall solar salterns constituted an excellent study system because of their easy accessibility, as well as the analogy of their microbial assemblages with some known deep-sea hypersaline anaerobic brines. By means of shotgun metagenomics and 16S rRNA gene amplicon sequencing, the microbial composition of the sediment was shown to be stable in time and space. The communities were formed by prokaryote representatives with a clear inferred anaerobic metabolism, mainly related to the methane, sulfur and nitrate cycles. The most conspicuous finding was the inverted nature of the vertical stratification. Contrarily to what could be expected, a methanogenic archaeal metabolism was found to dominate in the upper layers, whereas Bacteria with fermentative and anaerobic respiration metabolisms increased with depth. We could demonstrate the methanogenic nature of the members of candidate lineages DHVE2 and MSBL1, which were present in high abundance in this system, and described, for the first time, viruses infecting these lineages. Members of the putatively active aerobic genera Salinibacter and Halorubrum were detected especially in the deepest layers for which we hypothesize that either oxygen could be sporadically available, or they could perform anaerobic metabolisms. We also report a novel repertoire of virus species thriving in these sediments, which had special relevance because of their lysogenic lifestyles. |
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| Keywords: | Metagenomics Metaviromics Anaerobic sediments Hypersaline environment MSBL1 DHVE2 |
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