Ecology of purple sulfur bacteria in the highly stratified meromictic Lake Shunet (Siberia, Khakassia) in 2002–2009

Rogozin, D. Yu.; Zykov, V. V.; Дегерменджи, А. Г.

doi:10.1134/s0026261712060148

Cited by 20 publications

(17 citation statements)

References 22 publications

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“…That species most closely related to Halochromatium roseum dominated in Lake Oigon was a new discovery, distinct from the other two lakes. In Lake Shunet, there was a high relative abundance of species most closely related to Thiocapsa rosea , which supported previous observations [ 10 , 29 , 33 ]. However, the dominant PSB, Rheinheimera -like genus in Lake Shira differed from a PSB, Lamprocystis purpurea , in a previous report [ 9 , 32 ], which identified the species based on morphology and pigment composition.…”

Section: Discussionsupporting

confidence: 90%

“…Additional explanations for higher diversity in the anoxic layer might be related to a relatively lack of mixing ( i . e ., homogenization) in the anoxic layer and downward metabolic fluxes [ 3 , 8 , 29 , 34 ].…”

Section: Discussionmentioning

confidence: 99%

“…However, bacterial communities in these lakes have not been well characterized (coupled with a complete absence of studies for Lake Oigon in western Mongolia). In Lake Shira and Lake Shunet, bacterial surveys have only focused on a few predominant groups, such as PSB (related to Lamprocystis purpurea , Thiocapsa and Halochromatium species) and GSB (related to Prosthecochloris vibrioformis ) in the chemocline [ 10 , 29 , 31 , 32 ]. Abundance and seasonal dynamics of PSB in the two lakes have been characterized by pigment analysis, cultivation, and microscopic analysis [ 31 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…Abundance and seasonal dynamics of PSB in the two lakes have been characterized by pigment analysis, cultivation, and microscopic analysis [ 31 , 33 ]. Intriguingly, Lake Shunet had an unexpectedly high density of PSB (up to 1.8±0.4 x 10 8 cells/mL in the chemocline [ 10 , 32 ]), comparable to Lake Mahoney (4 x 10 8 cells/mL), which had the highest density of PSB reported in a meromictic lake [ 18 , 29 ]. Predominant bacteria in chemoclines of these lakes were characterized using 16S rRNA genes amplified by PCR and visualized by denaturing gradient gel electrophoresis [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Bacterial Communities of Three Saline Meromictic Lakes in Central Asia

et al. 2016

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Meromictic lakes located in landlocked steppes of central Asia (~2500 km inland) have unique geophysiochemical characteristics compared to other meromictic lakes. To characterize their bacteria and elucidate relationships between those bacteria and surrounding environments, water samples were collected from three saline meromictic lakes (Lakes Shira, Shunet and Oigon) in the border between Siberia and the West Mongolia, near the center of Asia. Based on in-depth tag pyrosequencing, bacterial communities were highly variable and dissimilar among lakes and between oxic and anoxic layers within individual lakes. Proteobacteria, Bacteroidetes, Cyanobacteria, Actinobacteria and Firmicutes were the most abundant phyla, whereas three genera of purple sulfur bacteria (a novel genus, Thiocapsa and Halochromatium) were predominant bacterial components in the anoxic layer of Lake Shira (~20.6% of relative abundance), Lake Shunet (~27.1%) and Lake Oigon (~9.25%), respectively. However, few known green sulfur bacteria were detected. Notably, 3.94% of all sequencing reads were classified into 19 candidate divisions, which was especially high (23.12%) in the anoxic layer of Lake Shunet. Furthermore, several hydro-parameters (temperature, pH, dissolved oxygen, H2S and salinity) were associated (P< 0.05) with variations in dominant bacterial groups. In conclusion, based on highly variable bacterial composition in water layers or lakes, we inferred that the meromictic ecosystem was characterized by high diversity and heterogenous niches.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bacterial Communities of Three Saline Meromictic Lakes in Central Asia

et al. 2016

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“…in Khakassia is well studied (Banks et al, 2004, Guseva et al, 2013 andetc. ), but there is no much information about microbial composition of these lakes especially about using it for a water quality assessment, except the Shira and the Shunet which were studied very well (Lobova et al, 2004, Rogozin D.Yu. et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Chemical and Microbial Composition of Khakassia Saline Lakes with Regard to their Ecological State

et al. 2014

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Khakassia is a unique region with semi-arid climate in the Russian Federation where there are a lot of saline lakes. These lakes are visited by a great number of people every year. As a result, saline lakes in Khakassia are exposed to anthropogenic influence. In this article distinctive features of the chemical and microbial composition of some saline lakes are considered. The distribution of such various bacteria physiological groups as enterobacteria, mesophillous saprophytes, psychrophilic saprophytes, oligotrophs and etc. is shown. A special attention is paid to the assessment of ecological state of some saline lakes. The ecological state of all lakes is found to be moderately polluted and polluted, but their selfpurification potential is not still exhausted.

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