Microbial processes and factors controlling their activities in alkaline lakes of the Mongolian plateau

Намсараев, З. Б.; Zaitseva, S. V.; Горленко, В. М.; Козырева, Л. П.; Намсараев, Б. Б.

doi:10.1007/s00343-015-4373-6

Cited by 16 publications

(11 citation statements)

References 23 publications

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“…At hypersaline conditions above 70 g/L, the situation becomes more complicated. The heterocystous cyanobacteria become inactive, but oxygenic photosynthesis still occurs (Namsaraev et al 2015). Which groups of bacteria are capable of fixing nitrogen under these conditions remained unclear.…”

Section: Discussionmentioning

confidence: 99%

“…The equatorial soda lakes are considered to be the most productive types of an ecosystem on the Earth showing primary production rates in excess of 10 g/(m 2 day) (Grant 2006;Melack 1981). The primary production of organic matter in the soda lakes of the cryoarid climate during summer time is not so high and is up to 3.86 g/(m 2 day) according to Namsaraev et al (2015). Nitrogen availability is one of the most important limiting factors for primary production (Axler et al 1978).…”

Section: Introductionmentioning

confidence: 99%

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Effect of salinity on diazotrophic activity and microbial composition of phototrophic communities from Bitter-1 soda lake (Kulunda Steppe, Russia)

Намсараев

Samylina²,

Сухачева

et al. 2018

Extremophiles

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Bitter-1 is a shallow hypersaline soda lake in Kulunda Steppe (Altai region, Russia). During a study period between 2005 and 2016, the salinity in the littoral area of the lake fluctuated within the range from 85 to 400 g/L (in July of each year). Light-dependent nitrogen fixation occurred in this lake up to the salt-saturating conditions. The rates increased with a decrease in salinity, both under environmental conditions and in laboratory simulations. The salinities below 100 g/L were favorable for light-dependent nitrogen fixation, while the process was dramatically inhibited above 200 g/L salts. The analysis of nifH genes in environmental samples and in enrichment cultures of diazotrophic phototrophs suggested that anaerobic fermenting and sulfate-reducing bacteria could participate in the dark nitrogen fixation process up to soda-saturating conditions. However, we cannot exclude the possibility that haloalkaliphilic nonheterocystous cyanobacteria (Euhalothece sp. and Geitlerinema sp.) and anoxygenic purple sulfur bacteria (Ectothiorhodospira sp.) might also play a role in the process at light conditions. The heterocystous cyanobacterium Nodularia sp. develops at low salinity (below 80 g/L) that is not characteristic for Bitter-1 Lake and thus does not make a significant contribution to the nitrogen fixation in this lake.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of salinity on diazotrophic activity and microbial composition of phototrophic communities from Bitter-1 soda lake (Kulunda Steppe, Russia)

Намсараев

Samylina²,

Сухачева

et al. 2018

Extremophiles

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“…Soda lakes are characterized by elevated levels of pH and Na-HCO 3 that result in saline and hypersaline alkaline waters. These ecosystems have been described worldwide, including the East African Rift Valley ( Jones et al, 1977 ; Eugster and Jones, 1979 ; Ventosa and Arahal, 1989 ; Duarte et al, 2012 ), the North and Central Americas ( Domagalski et al, 1989 ; Kazmierczak et al, 2011 ), Asia ( Ma and Edmunds, 2006 ; Namsaraev et al, 2015 ), Australia ( Hammer, 1986 ), and Europe ( Felföldi et al, 2009 ; Stenger-Kovács et al, 2014 ). The extreme environmental conditions of soda lakes (pH above 9 and salinity) are known to be stressful for phytoplankton communities, and however, several microbial and microalgae taxa have adapted to live under these harsh abiotic conditions ( Banciu and Muntyan, 2015 ; Sorokin et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Contrasting the Genetic Patterns of Microbial Communities in Soda Lakes with and without Cyanobacterial Bloom

et al. 2018

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Soda lakes have high levels of sodium carbonates and are characterized by salinity and elevated pH. These ecosystems are found across Africa, Europe, Asia, Australia, North, Central, and South America. Particularly in Brazil, the Pantanal region has a series of hundreds of shallow soda lakes (ca. 600) potentially colonized by a diverse haloalkaliphilic microbial community. Biological information of these systems is still elusive, in particular data on the description of the main taxa involved in the biogeochemical cycling of life-important elements. Here, we used metagenomic sequencing to contrast the composition and functional patterns of the microbial communities of two distinct soda lakes from the sub-region Nhecolândia, state of Mato Grosso do Sul, Brazil. These two lakes differ by permanent cyanobacterial blooms (Salina Verde, green-water lake) and by no record of cyanobacterial blooms (Salina Preta, black-water lake). The dominant bacterial species in the Salina Verde bloom was Anabaenopsis elenkinii. This cyanobacterium altered local abiotic parameters such as pH, turbidity, and dissolved oxygen and consequently the overall structure of the microbial community. In Salina Preta, the microbial community had a more structured taxonomic profile. Therefore, the distribution of metabolic functions in Salina Preta community encompassed a large number of taxa, whereas, in Salina Verde, the functional potential was restrained across a specific set of taxa. Distinct signatures in the abundance of genes associated with the cycling of carbon, nitrogen, and sulfur were found. Interestingly, genes linked to arsenic resistance metabolism were present at higher abundance in Salina Verde and they were associated with the cyanobacterial bloom. Collectively, this study advances fundamental knowledge on the composition and genetic potential of microbial communities inhabiting tropical soda lakes.

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“…The rates of oxygenic and anoxygenic photosynthesis in the soda lakes of Kulunda Steppe (0.62 and 0.12 g C/(m 2 per day), respectively, for Petukhovskoe) are close to the moderately saline soda lakes of the Transbaikal Region and Mongolian Plateau and much inferior to the eastern African and American soda lakes (Kompantseva et al 2009;Namsaraev et al 2015). The sulphur cycle is also active (Sorokin et al 2011a).…”

Section: Discussionmentioning

confidence: 94%

Characterization of modern dolomite stromatolites from hypersaline Petukhovskoe Soda Lake, Russia

Samylina

Zaytseva

2019

LET

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Microbialites occur in a number of modern soda lakes, but the formation of dolomite stromatolites in these environments is rare. Microbial metabolic activities are considered to influence precipitation of carbonate minerals (including dolomite) in marine, hypersaline and slightly alkaline environments due to their capacity to buffer pH of the local environmental settings. Hydrochemical features of hypersaline alkaline Petukhovskoe Soda Lake are already favourable for the precipitation of carbonate minerals, and the metabolic activities of microorganisms may not be significant in this type of environment. Stromatolites from this lake provide an excellent opportunity for the study of recent natural dolomite formation in the highly saturated soda environment. To understand the genesis of these stromatolites and to provide insight into environmental aspects of its formation, we have made a detailed structural and mineralogical description with the use of light and scanning electron microscopy, infrared spectroscopy and X‐ray analysis. Due to the special fluctuating conditions of sedimentation in the lake, stromatolites contain both layers with chemogenic precipitation of minerals and layers with fossilized algal, cyanobacterial and coccoid bacterial forms. The presence of dolomite, calcite and Mg calcites with different content of magnesium is detected. The primary independent binding of Mg and Si with the following binding of Ca in the pericellular and released exopolysaccharides is shown. Extracellular polymeric substances (EPS) and fluctuating hydrological regimen of the Petukhovskoe Soda Lake are considered to play the key role in the precipitation of Ca–Mg carbonates including dolomite.

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Microbial processes and factors controlling their activities in alkaline lakes of the Mongolian plateau

Cited by 16 publications

References 23 publications

Effect of salinity on diazotrophic activity and microbial composition of phototrophic communities from Bitter-1 soda lake (Kulunda Steppe, Russia)

Effect of salinity on diazotrophic activity and microbial composition of phototrophic communities from Bitter-1 soda lake (Kulunda Steppe, Russia)

Contrasting the Genetic Patterns of Microbial Communities in Soda Lakes with and without Cyanobacterial Bloom

Characterization of modern dolomite stromatolites from hypersaline Petukhovskoe Soda Lake, Russia

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