Algo-bacterial communities of the Kulunda steppe (Altai Region, Russia) Soda Lakes

Samylina, O. S.; Сапожников, Ф. В.; Gainanova, O. Yu.; Ryabova, Anastasia V.; Никитин, М. А.; Sorokin, Dimitry Y.

doi:10.1134/s0026261714060162

Cited by 43 publications

(32 citation statements)

References 15 publications

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“…The usual for Kulunda Steppe soda lakes' dominant filamentous benthic cyanobacteria belonging to the genera Geitlerinema and Nodosilinea (Oscillatoriales) and the green filamentous algae Ctenocladus circinnatus are identified in the community (Fig. 2) (Samylina et al 2014). The presence of mineralized cyanobacteria, bacteria and algae in the interior of stromatolites was shown previously (Samylina et al 2016).…”

Section: Structure and Mineralogical Composition Of The Stromatolitessupporting

confidence: 52%

“…) (Samylina et al . ). The presence of mineralized cyanobacteria, bacteria and algae in the interior of stromatolites was shown previously (Samylina et al .…”

Section: Resultsmentioning

confidence: 97%

“…Chlorophylls and bacteriochlorophylls originated from the decomposing phototrophic biomass which accumulates in significant quantities in Petukhovskoe Soda Lake (Samylina et al . ) may also serve as a source of Mg during the formation of stromatolites.…”

Section: Resultsmentioning

confidence: 99%

“…The Petukhovskoe Soda Lake is located in the Klyuchevskoi area of Altai Region (Russia), at coordinates 52°6 0 20.52″N, 79°9 0 22.19″E. Although known as Petukhovskoe Sodovoe in Russian, it is variously referred to by other names in English-language articles: Petukhovskoe Soda Lake (Lebedeva (Verba) et al 2008), Petukhovo (Kompantseva et al 2009(Kompantseva et al , 2010 or Cock soda lake (Foti et al 2007(Foti et al , 2008Sorokin et al 2010Sorokin et al , 2011aSamylina et al 2014Samylina et al , 2016.…”

Section: Geographical Setting Of the Sample Sitementioning

confidence: 99%

“…The diversity of eukaryotic organisms in the lake is relatively low: there are few species of green algae and diatoms, higher plants are absent, and invertebrates are represented by Ephydra larvae and Artemia sp. (Samylina et al 2014).…”

Section: Geographical Setting Of the Sample Sitementioning

confidence: 99%

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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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Section: Structure and Mineralogical Composition Of The Stromatolitessupporting

confidence: 52%

“…) (Samylina et al . ). The presence of mineralized cyanobacteria, bacteria and algae in the interior of stromatolites was shown previously (Samylina et al .…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Geographical Setting Of the Sample Sitementioning

confidence: 99%

Section: Geographical Setting Of the Sample Sitementioning

confidence: 99%

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

Samylina

Zaytseva

2019

LET

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Anaerobic Haloalkaliphiles

Sorokin

2017

Encyclopedia of Life Sciences

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Halo‐alkali‐philes is a type of double extremophiles functioning optimally in saline brines of soda lakes. Soda lakes are a specific type of salt lakes with their brines consisting mostly of alkaline sodium carbonates. With rare exceptions, the haloalkaliphiles are prokaryotes, represented by four major metabolic blocks: aerobic and anoxygenic phototrophs as primary producers and aerobic and anaerobic chemotrophs mostly involved in mineral cycling and mineralisation of organic carbon. The fermentative anaerobes in soda lakes mostly include members of Clostridia involved in polymer hydrolysis and further fermentation of the monomers. The halolalkaliphilic denitrifiers are represented mostly by the members of Gammaproteobacteria from the genera Halomonas and Alkalilimnicola/Alkalispirillum group. The sulfidogens is the most active group of secondary anaerobes in soda lakes and include two major groups – sulfate/thiosulfate reducers from the Deltaproteobacteria with a prominent capacity for sulfite and thiosulfate disproportionation and sulfur/polysulfide reducers from the phylum Chrysiogenetes. Furthermore, soda lake natronoarchaea can also participate in polysulfide respiration. Methanogenesis in soda lakes is active with all three classical pathway represented by haloalkaliphilic species, but, similar to salt lakes, it is dominated by methylotrophs. So far, little is known about the specific bioenergetic features of the soda lake anaerobes allowing them to thrive at high pH. One of it, however, seems to be in common – the substantial use of sodium‐pumping, both by primary and secondary cation pumps. Key Concepts Soda lakes is not the only highly alkaline habitat on Earth, but it is the only one where the extremely high pH is stable. Not only the high pH, but also a combination of chemical parameters created by extremely high carbonate alkalinity in brines of the soda lakes makes them a unique habitat dominated by Prokaryotic life. The salinity caused by strongly electrolytic NaCl in pH‐neutral brines differs substantially from the salinity of weakly electrolytic sodium carbonates in its osmotic effect on salt‐tolerant organisms. Extreme salinity and high pH impose extra energy demands on haloalkalphilic microbes, especially anaerobes with low energy‐producing metabolism. Nevertheless, all major functional groups of anaerobic microbes are present in soda lakes. The primary organic matter in soda lakes is mostly produced by protein-rich cyanobacteria. However, the identity of haloalkaliphilic anaerobes degrading proteins in soda lake sediments is still mostly unknown. The denitrifying haloalkaliphilies in soda lakes belong to Gammaproteobacteria but the identity of dissimilatory ammonifyers remains unknown. Many haloalkaliphilic anaerobes isolated from soda lakes are capable of using toxic metal oxyanions as electron acceptors but very few can use Fe(III). The most prominent property of the soda lake sulfidogens is the ability to grow by disproportionation of inorganic sulfur compounds. The methogenesis in soda lakes is dominated by methylotrophic pathways but, in contrast to salt lakes, the other pathways are also active at haloalkaline conditions. Low sulfide toxicity and high CO 2 and H 2 S‐absorbing capacity of the soda brines makes sulfidogenesis and methanogenesis at haloalkaline conditions attractive for application.

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Sodalinema

Noonan,

Dofher,

Kieft

et al. 2024

Bergey's Manual of Systematics of Archaea and Bacteria

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So.da.li.ne.ma. Gr. neut. n. nêma , filament; N.L. neut. n. Sodalinema , the name of the genus referring to alkaline‐saline habitats where this cyanobacterium was found (soda lake) and to the cyanobacterium morphology. Cyanobacteriota / Cyanobacteriia / Cyanobacteriales / Geitlerinemaceae / Sodalinema The Phormidium genus has been described as one of the most difficult phylogenetic lineages to resolve, with over 200 identified species representing distinct polyphyletic groups, including multiple strains intermingled with the genus Sodalinema . In this article, we attempt to address this inconsistency by describing and differentiating the genus Sodalinema from the other taxonomic lineage previously named Phormidium , using the Genome Taxonomy Database as a framework for data‐driven classification. This genus contains 64 strains, including 5 strains with high‐quality isolate genomes, 9 strains with associated metagenome‐assembled genomes, and 50 additional strains represented by small subunit ribosomal RNA gene sequences. Many of these strains have been identified as having potential for biotechnological applications and grow in high‐density biofilms. Members of the Sodalinema genus are filamentous cyanobacterium with straight, cylindrical, and unbranched trichomes. They perform oxygenic photosynthesis, with some strains capable of nonheterocystous nitrogen fixation and phototaxis. Colonies typically exist in the form of biofilms or microbial mats, growing either attached or floating, and have been observed globally in a variety of habitats, ranging from freshwater, marine, and high‐salinity environments (1.6–234 g/l total salinity), pH from neutral to 11.2, and temperatures up to 50°C. Strains are commonly isolated from high‐salinity soda lakes or salt marshes with no identified biosynthesis of cyanobacterial toxins. DNA G + C content (mol%) : 51.1–53.4. Type species : Sodalinema komarekii Cellamare et al. 2018.

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Algo-bacterial communities of the Kulunda steppe (Altai Region, Russia) Soda Lakes

Cited by 43 publications

References 15 publications

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

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

Anaerobic Haloalkaliphiles

Sodalinema

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