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Environmental Microbiology

Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake

Petra Pjevac, Marino Korlević, Jasmine S. Berg, Elvira Bura-Nakić, Irena Ciglenečki, Rudolf Amann, Sandi Orlić
G. Voordouw, Editor
Petra Pjevac
Department of Molecular Ecology, Max Planck Institute for Marine Microbiology, Bremen, Germany
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Marino Korlević
Center for Marine Research, Ruđer Bošković Institute, Rovinj, Croatia
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Jasmine S. Berg
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen, Germany
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Elvira Bura-Nakić
Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, CroatiaInstitute of Geochemistry and Petrology, Swiss Federal Institute of Technology, Zürich, Switzerland
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Irena Ciglenečki
Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
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Rudolf Amann
Department of Molecular Ecology, Max Planck Institute for Marine Microbiology, Bremen, Germany
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Sandi Orlić
Center for Marine Research, Ruđer Bošković Institute, Rovinj, CroatiaDivision of Materials Chemistry, Ruđer Bošković Institute, Zagreb, Croatia
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G. Voordouw
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DOI: 10.1128/AEM.02435-14
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ABSTRACT

Most stratified sulfidic holomictic lakes become oxygenated after annual turnover. In contrast, Lake Rogoznica, on the eastern Adriatic coast, has been observed to undergo a period of water column anoxia after water layer mixing and establishment of holomictic conditions. Although Lake Rogoznica's chemistry and hydrography have been studied extensively, it is unclear how the microbial communities typically inhabiting the oxic epilimnion and a sulfidic hypolimnion respond to such a drastic shift in redox conditions. We investigated the impact of anoxic holomixis on microbial diversity and microbially mediated sulfur cycling in Lake Rogoznica with an array of culture-independent microbiological methods. Our data suggest a tight coupling between the lake's chemistry and occurring microorganisms. During stratification, anoxygenic phototrophic sulfur bacteria were dominant at the chemocline and in the hypolimnion. After an anoxic mixing event, the anoxygenic phototrophic sulfur bacteria entirely disappeared, and the homogeneous, anoxic water column was dominated by a bloom of gammaproteobacterial sulfur oxidizers related to the GSO/SUP05 clade. This study is the first report of a community shift from phototrophic to chemotrophic sulfide oxidizers as a response to anoxic holomictic conditions in a seasonally stratified seawater lake.

FOOTNOTES

    • Received 29 July 2014.
    • Accepted 17 October 2014.
    • Accepted manuscript posted online 24 October 2014.
  • Supplemental material for this article may be found at http://dx.doi.org/10.1128/AEM.02435-14.

  • Copyright © 2015, American Society for Microbiology. All Rights Reserved.
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Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake
Petra Pjevac, Marino Korlević, Jasmine S. Berg, Elvira Bura-Nakić, Irena Ciglenečki, Rudolf Amann, Sandi Orlić
Applied and Environmental Microbiology Dec 2014, 81 (1) 298-308; DOI: 10.1128/AEM.02435-14

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Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake
Petra Pjevac, Marino Korlević, Jasmine S. Berg, Elvira Bura-Nakić, Irena Ciglenečki, Rudolf Amann, Sandi Orlić
Applied and Environmental Microbiology Dec 2014, 81 (1) 298-308; DOI: 10.1128/AEM.02435-14
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