Anoxygenic phototrophic bacteria of the Kislo-Sladkoe stratified lake (White Sea, Kandalaksha Bay)

Lunina, O. N.; Savvichev, Alexander S; Кузнецов, Б. Б.; Пименов, Н. В.; Горленко, В. М.

doi:10.1134/s0026261714010081

Cited by 24 publications

(8 citation statements)

References 18 publications

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“…Ferric iron salts were dissolved with 1% oxalic acid under visual control in order to reveal morphology of the cells precipitating minerals (Dubinina and Sorokina, 2014). For ultrathin sectioning, the material was treated as described previously (Lunina et al, 2013). The samples were examined under a JEM-100B electron microscope (JEOL, Japan) at 80 kV.…”

Section: Study Area Sample Collection and Characterizationmentioning

confidence: 99%

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

Savvichev

Kokryatskaya

Zabelina

et al. 2016

Environmental Microbiology

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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 day ) 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 day ) 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 day ) below the chemocline zone. The rates of methane oxidation were as high as 1.8 μmol CH L day 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.

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Section: Study Area Sample Collection and Characterizationmentioning

confidence: 99%

“…Microbial processes and the species composition of anoxygenic phototrophs were studied for a number of saline lakes (Gorlenko et al ., ; Lunina et al ., ). Microbial processes and APB species composition of mineralized lakes Shira and Shunet (Khakassia, Russia) were also studied (Pimenov et al ., ; Savvichev et al ., ; Rogozin et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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

Savvichev

Kokryatskaya

Zabelina

et al. 2016

Environmental Microbiology

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“…often occurs here qualified as hyper blooming (Krasnova et al, 2014). Most of the bacterial proсesses reach here the highest intensity (Lunina et al, 2013;2016). 5) The lower anoxic layer accumulates organic matter, sulphides, and nutrients, that are stored here inaccessible to aerobic organisms, including phytoplankton, before the sudden cases of autumn mixing.…”

Section: Resultsmentioning

confidence: 89%

From the strait to the meromictic lake: water bodies of fjard and skerry coasts, their relief, hydrological features, and ecological communities (on the example of Lake Kislo-Sladkoe, Karelian Coast of the White Sea, Russia)

Repkina

Krasnova

Leontev

et al. 2020

LFWB

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The purpose of the study is to reconstruct the evolution of bodies of water on the fjard and skerrie shores by their uplift. The object of the study is the Lake Kislo-Sladkoe on the Karelian Coast of the White Sea (Russia). It was established that Lake Kislo-Sladkoe was a narrow strait with fast tidal currents up to 600-500 years ago; about 100-150 years ago it became a semi-enclosed lagoon; and since the 1960s the isolation progressed to such a stage that communication with the sea is now limited to monthly reflux of sea water during syzygy tides. Most of the time the lake is stratified, autumn mixing occurs on average once every two years during autumn storms. In the period between these cases the lake stays meromictic with the brackish communities in the upper layer, high amount and biomass of the several eurybiontic species below the halocline, high density of sulfur bacteria on the border of aerobic and anoxic zones, and anaerobic bacterial community in the bottom water. In the previous marine strait the water was totally homogeneous, saturated with the oxygen, and represented typical marine environment. Such dramatic changes occur due to the postglacial uplift of the coast (1-4 mm/ year) and closure of bays and straits by coastal accumulative landforms. The emergence of small bars and spits can accelerate the separation of these bodies of water from the sea by 100-150 years.

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“…Total microbial cell counts were determined using fluorescence microscope (see Supporting Information methods). For ultrathin sectioning, the material was treated as described previously (Lunina et al, 2013). The samples were examined under a JEM-100B electron microscope (JEOL, Japan) at 80 kV.…”

Section: Cell Countsmentioning

confidence: 99%

Sharp water column stratification with an extremely dense microbial population in a small meromictic lake, Trekhtzvetnoe

Savvichev

Babenko

Lunina

et al. 2018

Environmental Microbiology

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Located on the shore of Kandalaksha Bay (the White Sea, Russia) and previously separated from it, Trekhtzvetnoe Lake (average depth 3.5 m) is one of the shallowest meromictic lakes known. Despite its shallowness, it features completely developed water column stratification with high-density microbial chemocline community (bacterial plate) and high rates of major biogeochemical processes. A sharp halocline stabilizes the stratification. Chlorobium phaeovibrioides dominated the bacterial plate, which reached a density of 2 × 10 cell ml and almost completely intercepts H S diffusion from the anoxic monimolimnion. The resulting anoxygenic photosynthesis rate reached 240 μmol C l day , exceeding the oxygenic photosynthesis rate in the mixolimnion. The rates of other processes are also high, reaching 4.5 μmol CH l day for methane oxidation and 35 μmol S l day for sulfate reduction. Metagenomic analysis demonstrated that the Chl. phaeovibrioides population in the bacterial plate layer had nearly clonal homogeneity, although some fraction of these cells harbour a plasmid. The Chlorobium population was associated with bacteriophages that share homology with CRISPR spacers in the host. These features make the ecosystem of the Trekhtzvetnoe Lake a valuable model for studying regulation and evolution processes in natural high-density microbial systems.

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Anoxygenic phototrophic bacteria of the Kislo-Sladkoe stratified lake (White Sea, Kandalaksha Bay)

Cited by 24 publications

References 18 publications

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

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

From the strait to the meromictic lake: water bodies of fjard and skerry coasts, their relief, hydrological features, and ecological communities (on the example of Lake Kislo-Sladkoe, Karelian Coast of the White Sea, Russia)

Sharp water column stratification with an extremely dense microbial population in a small meromictic lake, Trekhtzvetnoe

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