Seasonal changes in the structure of the anoxygenic photosynthetic bacterial community in Lake Shunet, Khakassia

Lunina, O. N.; Bryantseva, I. A.; Акимов, В. Н.; Rusanov, Igor I; Rogozin, D. Yu.; Barinova, E. S.; Lysenko, A. M.; Пименов, Н. В.

doi:10.1134/s0026261707030149

Cited by 21 publications

(15 citation statements)

References 8 publications

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“…In Lake El Tobar, photosynthetic pigments and 16S rRNA gene sequences recovered from the salty bottom traced the presence of an okenone-containing Halochromatium spp. phylotype distantly related to previously reported strains from salt-rich environments (Lake Shunet, Lunina et al 2007). Overall, these planktonic Chromatiaceae were characterized by the presence of okenone as the main carotenoid and by slow growth rates (Van Gemerden 1974).…”

Section: Undmentioning

confidence: 69%

Contribution of deep dark fixation processes to overall CO2 incorporation and large vertical changes of microbial populations in stratified karstic lakes

et al. 2011

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We carried out a detailed study in five stratified lakes in the karstic regions of NE Spain along a redox gradient combining vertical profiles of inorganic carbon dioxide fixation and analysis of microbial (bacteria and archaea) community composition determined by 16S rRNA gene fingerprinting (DGGE), microscopic counts, and pigment analysis. High rates of non-photosynthetic (i.e., ''dark'') inorganic carbon incorporation were detected mostly at deeper layers after short-term in situ incubations at noon. Significant contribution of dark CO 2 incorporation was observed at the whole lake level for the single time sampling, ranging between 4 and 19% of total carbon fixation measured, and up to 31% in the case of a meromictic basin. Good agreement was found between vertical patterns in redox conditions and the different microbial diversity descriptors (DGGE band sequencing, microscopic analysis, and pigment data), showing large vertical changes in microbial community composition covering a wide range of phylogenetic diversity. Cyanobacteria, Alpha and Beta-Proteobacteria, Actinobacteria, Flavobacteria and Flectobacillaceae were the most frequently recovered groups in the DGGE from oxygenated water masses. In anoxic waters, we found Beta-Proteobacteria mostly of the Rhodoferax group, Gamma-Proteobacteria (Chromatiaceae), Delta-Proteobacteria related to different sulfate reducing bacteria, Chlorobiaceae, and anaerobic Bacteroidetes spread among the Bacteroidales, Flavobacteriales and Saprospiraceae. However, as a whole, we did not find any significant correlation between dark fixation rates and either nutrient distribution and microbial community composition in the study lakes. All of this suggests that (1) different physiologies and ecologies are simultaneously contributing to the process (2) more sensitive methods are needed and more specific compounds measured and (3) some of the non-specialist microbial populations detected may carry out carbon dioxide assimilation in the dark under in situ conditions.

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Section: Undmentioning

confidence: 69%

Contribution of deep dark fixation processes to overall CO2 incorporation and large vertical changes of microbial populations in stratified karstic lakes

et al. 2011

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“…15-20 times higher than in Lake Shira. The chemocline of the lake is characterized by a thin (5 cm) but dense layer of purple and green phototrophic bacteria (10 8 cells ml -1 ; Lunina et al 2007) and a diverse community of microorganisms, comprising the ciliates Strombidium and Cyclidium spp. and mixotrophic flagellates Cryptomonas sp.…”

Section: Methodsmentioning

confidence: 99%

The vertical distribution and abundance of Gammarus lacustris in the pelagic zone of the meromictic lakes Shira and Shunet (Khakassia, Russia)

et al. 2010

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The vertical distribution and abundance of Gammarus lacustris in the pelagic zone of two fishless meromictic lakes, L. Shira and L. Shunet, in Southern Siberia (Russia), was studied with the underwater video recording system and using vertical hauls. In both lakes, during summer stratification, Gammarus was distributed non-homogenously, with a stable peak in the metalimnion. The average depth of Gammarus population in the pelagic zone was significantly correlated with the depth of the thermocline. Gammarus abundances obtained using vertical plankton hauls with net were quite comparable with those obtained from video records. The peak abundance of Gammarus in the pelagic zone of the lakes observed with underwater video amounted up to 400 individuals m -2 , while the peak animal densities in the metalimnion reached 50 ind. m -3 . The data are compared with previously published abundances of Gammarus in the littoral of Lake Shira. Both littoral and pelagic can be equally important habitats for amphipods in meromictic lakes. The absence of fish in the pelagic zone, high oxygen concentration, low water temperature, increased seston concentration, elevated water density in the metalimnion and the anoxic hypolimnion can be the most probable combination of factors that are responsible for the peak of Gammarus in the metalimnion of these lakes.

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“…For computing this, a calibration factor of 2.65 9 10 -14 g Bchl a cell -1 was derived from parallel determinations of Bchl a and PSB numbers in samples of 2007 and 2008. A calibration factor of 13.4 9 10 -14 g Bchl d cell -1 (Lunina et al 2007a) was used to convert the GSB numbers into Bchl d.…”

Section: Pigment Determinationsmentioning

confidence: 99%

Effect of winter conditions on distributions of anoxic phototrophic bacteria in two meromictic lakes in Siberia, Russia

et al. 2009

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Seasonal changes in the structure of the anoxygenic photosynthetic bacterial community in Lake Shunet, Khakassia

Cited by 21 publications

References 8 publications

Contribution of deep dark fixation processes to overall CO2 incorporation and large vertical changes of microbial populations in stratified karstic lakes

Contribution of deep dark fixation processes to overall CO2 incorporation and large vertical changes of microbial populations in stratified karstic lakes

The vertical distribution and abundance of Gammarus lacustris in the pelagic zone of the meromictic lakes Shira and Shunet (Khakassia, Russia)

Effect of winter conditions on distributions of anoxic phototrophic bacteria in two meromictic lakes in Siberia, Russia

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