Microbial community of the chemocline of the meromictic Lake Shunet (Khakassia, Russia) during summer stratification

Rogozin, D. Yu.; Trusova, M. Yu.; Khromechek, Elena B.; Degermendzhy, Andrey G.

doi:10.1134/s0026261710020189

Cited by 30 publications

(29 citation statements)

References 12 publications

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“…Microbial processes and the species composition of anoxygenic phototrophs were studied for a number of saline lakes (Gorlenko et al, 1976;1983;Lunina et al, 2005;. Microbial processes and APB species composition of mineralized lakes Shira and Shunet (Khakassia, Russia) were also studied (Pimenov et al, 2003;Savvichev et al, 2005;Rogozin et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…A compact transition zone between the oxic mixolimnion (mixed water layers) and anoxic monimolimnion in many cases is populated by a dense microbial community dominated by anoxic phototrophic bacteria (Sorokin 1970;Van Gemerden and Mas 1995;Rogozin et al 2010). Microbial interactions in this community, as well as the role of anoxic phototrophic bacteria in lake trophic chains have remained understudied (Overmann 1997).…”

Section: Introductionmentioning

confidence: 99%

Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002–2009

et al. 2010

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In a brackish, temperate, 24-m-deep Lake Shira, the profiles of salinity, temperature, oxygen and sulfide concentrations were measured on a seasonal basis from 2002 to 2009. The lake was shown to be meromictic with autumnal overturn restricted to mixolimnion. The depth of mixolimnion and position of oxic-anoxic interface varied annually. The spring mixing processes contribute to the formation of mixolimnion in autumn. The exceptionally windy spring of 2007 caused the deepening of mixolimnion in the winter of 2008. The winter position of oxic-anoxic interface was affected by the position of lower boundary of mixolimnion in all winters. The salinity in the winter mixolimnion increased compared with the autumn because of freezing out of salts from the upper water layers meters during ice formation and their dissolution in water below. The profiles of salinity and temperature were simulated by the mathematical 1-D model of temperature and salinity conditions taking into account ice formation. The simulated profiles generally coincided with the measured ones. The coincidence implies that simplified one-dimensional model can be applied to roughly describe salinity and density profiles and mixing behavior of Lake Shira.

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“…(Chromatiaceae), which we had previously isolated from the anaerobic zone of Lake Shira (AJ633676 in EMBL/GenBank) (Rogozin et al, 2010).…”

Section: Methodsmentioning

confidence: 99%

“…In Lake Shira, which experiences harsh continental climate and which is situated in southern Siberia (the North-Minusinsk Depression, the Republic of Khakassia), the chemocline zone is located at depths between 11 and 16 m, where the water temperature remains low, 2-4°С on average, throughout the year. In some years, however, the temperature varies more widely, between -0.5°С and +8°С, and PSB biomass changes as well (Rogozin et al, 2016 (Lunina et al, 2007;Rogozin et al, 2010;Rogozin, unpublished).…”

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confidence: 99%

Growth of purple sulfur bacterium Thiocapsa sp. Shira_1 at low temperatures characteristic of the chemocline of Lake Shira

Rogozin¹,

Tarnovsky²,

Рогозин³

et al. 2018

J. Sib. Fed. Univ., Biol.

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Forecasting the abundance of phototrophic sulfur bacteria in lakes is very important because 1) these bacteria are major consumers of hydrogen sulfide, and 2) fossil carotenoids of these bacteria are retrospective biomarkers of limnological conditions. Therefore, understanding the factors controlling the dynamics of the abundance of phototrophic sulfur bacteria in a lake is necessary both for the prediction of hydrogen sulfide content and for paleo-limnological reconstruction. Based on longterm monitoring of the abundance of purple sulfur bacteria (PSB) in the saline meromictic Lake Shira (South Siberia, Khakassia), we proposed a hypothesis that relatively small changes in water temperature in the cold deep chemocline affect the PSB abundance in the lake. We tested this hypothesis experimentally. The purple sulfur bacterium Thiocapsa sp. Shira_1 (Chromatiaceae) from Lake Shira (South Siberia, Russia) was grown on a sulfide-containing synthetic medium under anoxic conditions in batch culture at low temperatures, from-1ºC to +8ºC, which were similar to in situ temperatures observed in the chemocline of Lake Shira. The cell growth rate at +8ºC was similar to the growth rate at room temperature, whereas there was no growth at-1ºC and +5ºC. Therefore, the variations in the biomass of purple sulfur bacteria (PSB) observed in Lake Shira could be caused by variations in chemocline temperature. The high correlation between chemocline temperature and PSB biomass supported this conclusion.

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Microbial community of the chemocline of the meromictic Lake Shunet (Khakassia, Russia) during summer stratification

Cited by 30 publications

References 12 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)

Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002–2009

Growth of purple sulfur bacterium Thiocapsa sp. Shira_1 at low temperatures characteristic of the chemocline of Lake Shira

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