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  • 标题:Vertical distribution of microbial communities in a perennially stratified Arctic lake with saline, anoxic bottom waters
  • 本地全文:下载
  • 作者:André M. Comeau ; Tommy Harding ; Pierre E. Galand
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2012
  • 卷号:2
  • DOI:10.1038/srep00604
  • 出版社:Springer Nature
  • 摘要:

    Meromictic lakes are useful biogeochemical models because of their stratified chemical gradients and separation of redox reactions down the water column. Perennially ice-covered meromictic lakes are particularly stable, with long term constancy in their density profiles. Here we sampled Lake A, a deep meromictic lake at latitude 83°N in High Arctic Canada. Sampling was before (May) and after (August) an unusual ice-out event during the warm 2008 summer. We determined the bacterial and archaeal community composition by high-throughput 16S rRNA gene tag-pyrosequencing. Both prokaryote communities were stratified by depth and the Bacteria differed between dates, indicating locally driven selection processes. We matched taxa to known taxon-specific biogeochemical functions and found a close correspondence between the depth of functional specialists and chemical gradients. These results indicate a rich microbial diversity despite the extreme location, with pronounced vertical structure in taxonomic and potential functional composition, and with community shifts during ice-out.

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    © 2012 Macmillan Publishers Limited. All rights reserved

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