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Savvichev, Alexander S.; Kokryatskaya, Natalia M.; Zabelina, Svetlana A.; Rusanov, Igor I.; Zakharova, Elena E.; Veslopolova, Elena F.; Lunina, Olga N.; Patutina, Ekaterina O.; Bumazhkin, Boris K.; Gruzdev, Denis S.; Sigalevich, Pavel A.; Pimenov, Nikolay V.; Kuznetsov, Boris B.; Gorlenko, Vladimir M.

Microbial processes of the carbon and sulfur cycles in an ice‐covered, iron‐rich meromictic lake Svetloe (Arkhangelsk region, Russia)

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  • Medientyp: E-Artikel
  • Titel: Microbial processes of the carbon and sulfur cycles in an ice‐covered, iron‐rich meromictic lake Svetloe (Arkhangelsk region, Russia)
  • Beteiligte: Savvichev, Alexander S.; Kokryatskaya, Natalia M.; Zabelina, Svetlana A.; Rusanov, Igor I.; Zakharova, Elena E.; Veslopolova, Elena F.; Lunina, Olga N.; Patutina, Ekaterina O.; Bumazhkin, Boris K.; Gruzdev, Denis S.; Sigalevich, Pavel A.; Pimenov, Nikolay V.; Kuznetsov, Boris B.; Gorlenko, Vladimir M.
  • Erschienen: Wiley, 2017
  • Erschienen in: Environmental Microbiology
  • Sprache: Englisch
  • DOI: 10.1111/1462-2920.13591
  • ISSN: 1462-2912; 1462-2920
  • Entstehung:
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  • Beschreibung: <jats:title>Summary</jats:title><jats:p>Biogeochemical, isotope geochemical and microbiological investigation of Lake Svetloe (White Sea basin), a meromictic freshwater was carried out in April 2014, when ice thickness was ∼0.5 m, and the ice‐covered water column contained oxygen to 23 m depth. Below, the anoxic water column contained ferrous iron (up to 240 μμM), manganese (60 μM), sulfide (up to 2 μM) and dissolved methane (960 μM). The highest abundance of microbial cells revealed by epifluorescence microscopy was found in the chemocline (redox zone) at 23–24.5 m. Oxygenic photosynthesis exhibited two peaks: the major one (0.43 μmol C L<jats:sup>−1</jats:sup> day<jats:sup>−1</jats:sup>) below the ice and the minor one in the chemocline zone, where cyanobacteria related to <jats:italic>Synechococcus rubescens</jats:italic> were detected. The maximum of anoxygenic photosynthesis (0.69 μmol C L<jats:sup>−1</jats:sup> day<jats:sup>−1</jats:sup>) at the oxic/anoxic interface, for which green sulfur bacteria <jats:italic>Chlorobium phaeoclathratiforme</jats:italic> were probably responsible, exceeded the value for oxygenic photosynthesis. Bacterial sulfate reduction peaked (1.5 μmol S L<jats:sup>−1</jats:sup> day<jats:sup>−1</jats:sup>) below the chemocline zone. The rates of methane oxidation were as high as 1.8 μmol CH<jats:sub>4</jats:sub> L<jats:sup>−1</jats:sup> day<jats:sup>−1</jats:sup> at the oxi/anoxic interface and much lower in the oxic zone. Small phycoerythrin‐containing <jats:italic>Synechococcus</jats:italic>‐related cyanobacteria were probably involved in accumulation of metal oxides in the redox zone.</jats:p>