Activity and bacterial diversity of snow around Russian Antarctic stations |
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| Authors: | Anna Lopatina Vjacheslav Krylenkov Konstantin Severinov |
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| Institution: | 1. State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100085, China;4. Himalayan Environment Research Institute (HERI), Kathmandu, Nepal;5. University of Chinese Academy of Sciences, Beijing 100049, China;6. Tanggula Cryosphere and Environment Observation Station, State Key Laboratory of Cryospheric Sciences, Lanzhou 730000, China;7. Laboratory of Green Chemistry, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland;1. Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy;2. Water Research Institute, National Research Council (IRSA-CNR), Monterotondo, Rome, Italy;3. Department of Biological and Environmental Sciences, University of Jyvaskyla, Jyvaskyla, Finland;4. Institute for the Coastal Marine Environment, National Research Council (IAMC-CNR), Messina, Italy;1. State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. Center for the Pan-Third Pole Environment, Lanzhou University, Lanzhou 730000, China;3. State Key Laboratory of Marine Environmental Science, Fujian Key Laboratory of Marine Carbon Sequestration, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, Fujian, China;4. Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong, China;5. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China;6. University of Chinese Academy of Science, Beijing 100101, China |
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| Abstract: | The diversity and temporal dynamics of bacterial communities in pristine snow around two Russian Antarctic stations was investigated. Taxonomic analysis of rDNA libraries revealed that snow communities were dominated by bacteria from a small number of operational taxonomic units (OTUs) that underwent dramatic swings in abundance between the 54th (2008–2009) and 55th (2009–2010) Russian Antarctic expeditions. Moreover, analysis of the 55th expedition samples indicated that there was very little, if any, correspondence in abundance of clones belonging to the same OTU present in rDNA and rRNA libraries. The latter result suggests that most rDNA clones originate from bacteria that are not alive and/or active and may have been deposited on the snow surface from the atmosphere. In contrast, clones most abundant in rRNA libraries (mostly belonging to Variovorax, Janthinobacterium, Pseudomonas, and Sphingomonas genera) may be considered as endogenous Antarctic snow inhabitants. |
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| Keywords: | Bacterial diversity Antarctica Snow Psychrophiles 16S rDNA |
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