In:
Environmental Microbiology, Wiley, Vol. 19, No. 2 ( 2017-02), p. 659-672
Abstract:
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 −1 day −1 ) below the ice and the minor one in the chemocline zone, where cyanobacteria related to Synechococcus rubescens were detected. The maximum of anoxygenic photosynthesis (0.69 μmol C L −1 day −1 ) at the oxic/anoxic interface, for which green sulfur bacteria Chlorobium phaeoclathratiforme were probably responsible, exceeded the value for oxygenic photosynthesis. Bacterial sulfate reduction peaked (1.5 μmol S L −1 day −1 ) below the chemocline zone. The rates of methane oxidation were as high as 1.8 μmol CH 4 L −1 day −1 at the oxi/anoxic interface and much lower in the oxic zone. Small phycoerythrin‐containing Synechococcus ‐related cyanobacteria were probably involved in accumulation of metal oxides in the redox zone.
Type of Medium:
Online Resource
ISSN:
1462-2912
,
1462-2920
DOI:
10.1111/emi.2017.19.issue-2
DOI:
10.1111/1462-2920.13591
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
2020213-1
SSG:
12
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