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Lake Shira, a Siberian salt lake: Ecosystem structure and function. 2. Brachionus plicatilis (rotatoria) growth and development / T. A. Temerova, A. G. Degermendzhy, A. P. Tolomeyev // International Journal of Salt Lake Research. - 1999. - Vol. 8, Is. 3. - P233-244, DOI 10.1023/A:1009001908937 . - ISSN 1037-0544
Кл.слова (ненормированные):
Brachionus plicatilis -- Growth rate -- Reproduction -- Simulation model -- Trophic conditions -- growth -- ontogeny -- saline lake -- trophic conditions -- zooplankton -- Russian Federation -- Brachionus plicatilis -- Chlorella vulgaris -- Rotifera
Аннотация: The growth and development of Brachionus plicatilis (Muller), a rotifer and one of the most abundant zooplankton species in Lake Shira, a saline lake at low temperature in the Republic of Khakassia, was studied in cultures at different trophic conditions. Growth indices were evaluated at natural (lake) concentrations of bacteria, Chlorella vulgaris, a microalga, and Candida utilis, a yeast. The negative effect on rotifer reproduction in the algal-bacterial community by blue-green algae was demonstrated. The ratio of ontogenetic periods was shown to be in accord with species and food concentration. Base values required to calculate B. plicatilis population simulation model parameters were defined.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Akademgodorok, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Temerova, T.A.; Degermendzhy, A.G.; Tolomeyev, A.P.

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Thin-layer vertical distributions of purple sulfur bacteria in chemocline zones of meromictic lakes Shira and Shunet (Khakassia) / D. Yu. Rogozin [et al.] // Doklady Biological Sciences. - 2005. - Vol. 400, Is. 1-6. - P54-56, DOI 10.1007/s10630-005-0042-9 . - ISSN 0012-4966
Кл.слова (ненормированные):
Bacteria (microorganisms) -- Chromatiaceae

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Vinogradskii Inst. of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, Moscow, 117312, Russian Federation
Papanin Inst. Biol. of Inland Waters, Russian Academy of Sciences, Yaroslavl'Oblast, 152742, Russian Federation
Department of Biophysics, Krasnoyarsk State University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Yu.; Pimenov, N.V.; Kosolapov, D.B.; Chan'kovskaya, Yu.V.; Degermendzhy, A.G.

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Fine stratified distribution of Gammarus lacustris sars (Crustacea: Amphipoda) in the pelagic zone of the meromictic Lake Shira (Khakassia, Russia) / A. P. Tolomeyev, E. S. Zadereev, A. G. Degermendzhy // Doklady Biochemistry and Biophysics. - 2006. - Vol. 411, Is. 1. - P346-348, DOI 10.1134/S1607672906060068 . - ISSN 1607-6729
Кл.слова (ненормированные):
fresh water -- animal -- article -- Crustacea -- demography -- ecosystem -- physiology -- population dynamics -- Animals -- Crustacea -- Demography -- Ecosystem -- Fresh Water -- Population Dynamics -- Amphipoda -- Crustacea -- Gammarus -- Gammarus lacustris

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Tolomeyev, A.P.; Zadereev, E.S.; Degermendzhy, A.G.

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The vertical distribution of zooplankton in brackish meromictic lake with deep-water chlorophyll maximum / Y. S. Zadereev, A. P. Tolomeyev // Hydrobiologia. - 2007. - Vol. 576, Is. 1. - P69-82, DOI 10.1007/s10750-006-0294-x . - ISSN 0018-8158
Кл.слова (ненормированные):
Anoxic hypolimnion -- Deep water chlorophyll maximum -- Meromictic lake -- Stratification -- Vertical distribution -- Zooplankton -- Algae -- Chlorophyll -- Growth kinetics -- Lakes -- Saline water -- Anoxic hypolimnion -- Deep water chlorophyll maximum -- Meromictic lake -- Stratification -- Vertical distribution -- Zooplanktons -- Biodiversity -- biomass -- brackish water -- chlorophyll -- green alga -- meromictic lake -- reproduction -- stratification -- vertical distribution -- zooplankton -- Eurasia -- Khakassia -- Lake Shira -- Russian Federation -- Arctodiaptomus salinus -- Brachionus plicatilis -- Chlorophyta -- Copepoda -- Hexarthra oxiuris -- Rotifera
Аннотация: We examined the dynamics of the vertical stratification of physical, chemical and biological factors in a brackish meromictic lake with a deep-water chlorophyll maximum (Shira Lake, Russia, Khakasia) during the growing season and estimated how the vertical distribution of these factors influences the vertical distribution of the zooplankton community. The vertical distribution of zooplankton was restricted by the anoxic hypolimnion. Nauplii and younger copepodides (C1-C3) of the copepod, Arctodiaptomus salinus, and the rotifer, Brachionus plicatilis, were found in the upper warm waters. During summer stratification the maximum of A. salinus biomass, which consisted mainly of older copepodides (C4-C5) and females, was associated with the deep-water maximum of biomass of green algae, which are the preferred diet for this species. The vertical distribution of the rotifer Hexarthra oxiuris was bimodal with numerical peaks in the epi- and hypolimnion. Reproduction peaks of dominant species were separated in time. The reproduction peak of A. salinus was at the beginning of summer when A. salinus constituted up to 99% of total zooplankton biomass. The development of rotifers was detected after the reproduction peak of A. salinus when the biomass of rotifers reached 50% of total zooplankton biomass. В© 2007 Springer Science+Business Media B.V.

Scopus
Держатели документа:
Institute of Biophysics SB RAS, Akademgorodok, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Zadereev, Y.S.; Tolomeyev, A.P.

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Anoxygenic phototrophic bacterial community of Lake Shira (Khakassia) / O. N. Lunina [et al.] // Microbiology. - 2007. - Vol. 76, Is. 4. - P469-479, DOI 10.1134/S0026261707040133 . - ISSN 0026-2617
Кл.слова (ненормированные):
Anoxygenic photosynthesis -- Anoxygenic phototrophic bacteria -- Meromictic brackish lakes -- Ahrensia kielensis -- Bacteria (microorganisms) -- Chlorobi -- Chlorobium -- Chlorobium limicola -- Chromatiaceae -- Lamprocystis purpurea -- Photobacteria -- Proteobacteria -- Rhodomicrobium -- Rhodovulum -- Rhodovulum strictum -- Thiocapsa roseopersicina
Аннотация: The anoxygenic phototrophic bacterial community of the brackish meromictic Lake Shira (Khakassia) was investigated in August 2001, July 2002, and February-March 2003. In all the periods of investigation, the prevailing microorganisms were purple sulfur bacteria similar to Lamprocystis purpurea in morphology and pigment composition. Their highest number (3 ? 10 5 cells/ml) was recorded in July 2002 at the depth of 15 m. According to 16S rRNA gene analysis, the strain of purple sulfur bacteria isolated in 2001 and designated ShAm01 exhibited 98.6% similarity to the type strain of Thiocapsa roseopersicina and 97.1-94.4% similarity to the type strains of Tca. pendens, Tca. litoralis, and Tca. rosea. The minor microorganisms of the anoxygenic phototrophic bacterial community within the period of investigation were nonsulfur purple bacteria phylogenetically close to Rhodovulum strictum (98.3% similarity, strain ShRb01), Ahrensia kielensis (of 93.9% similarity, strain ShRb02), Rhodomicrobium vannieli (of 99.7% similarity, strain ShRmc01), and green sulfur bacteria, phylogenetically close to Chlorobium limicola (of 98.7% similarity, strain ShCl03). В© 2007 Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russian Federation
Skryabin Institute of Microbial Biochemistry and Physiology, Russian Academy of Sciences, Pushchino
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Lunina, O.N.; Bryantseva, I.A.; Akimov, V.N.; Rusanov, I.I.; Barinova, E.S.; Lysenko, A.M.; Rogozin, D.Yu.; Pimenov, N.V.

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Seasonal changes in the structure of the anoxygenic photosynthetic bacterial community in Lake Shunet, Khakassia / O. N. Lunina [et al.] // Microbiology. - 2007. - Vol. 76, Is. 3. - P368-379, DOI 10.1134/S0026261707030149 . - ISSN 0026-2617
Кл.слова (ненормированные):
Anoxygenic photosynthesis -- Eutrophic meromictic saline lakes -- Green sulfur phototrophic bacteria -- Purple nonsulfur phototrophic bacteria -- Purple sulfur phototrophic bacteria -- Bacteria (microorganisms) -- Chlorobi -- Chromatiaceae -- Halochromatium -- Photobacteria -- Prosthecochloris vibrioformis -- Proteobacteria -- Rhodospirillaceae -- Rhodovulum -- Rhodovulum euryhalinum -- Thiocapsa
Аннотация: Seasonal studies of the anoxygenic phototrophic bacterial community of the water column of the saline eutrophic meromictic Lake Shunet (Khakassia) were performed in 2002 (June) and 2003 (February-March and August). From the redox zone down, the lake water was of dark green color. Green sulfur bacteria predominated in every season. The maximum number of green sulfur bacteria was 107 cells/ml in summer and 106 cells/ml in winter. A multi-syringe stratification sampler was applied for the study of the fine vertical distribution of phototrophs in August 2003; the sampling was performed every 5 cm. A 5-cm-thick pink-colored water layer inhabited by purple sulfur bacteria was shown to be located above the layer of green bacteria. The species composition and ratio of purple bacterial species depended on the sampling depth and on the season. In summer, the number of purple sulfur bacteria in the layer of pink water was 1.6 ? 108 cells/ml. Their number in winter was 3 ? 105 cells/ml. In the upper oxygen-containing layer of the chemocline the cells of purple nonsulfur bacteria were detected in summer. The maximum number of nonsulfur purple bacteria, 5 ? 102 cells/ml, was recorded in August 2003. According to the results of the phylogenetic analysis of pure cultures of the isolated phototrophic bacteria, which were based on 16S rDNA sequencing, green sulfur bacteria were close to Prosthecochloris vibrioformis, purple sulfur bacteria, to Thiocapsa and Halochromatium species, and purple nonsulfur bacteria, to Rhodovulum euryhalinum and Pinkicyclus mahoneyensis. В© Nauka/Interperiodica 2007.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russian Federation
Skryabin Institute of Microbial Biochemistry and Physiology, Russian Academy of Sciences, Puschino, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Lunina, O.N.; Bryantseva, I.A.; Akimov, V.N.; Rusanov, I.I.; Rogozin, D.Yu.; Barinova, E.S.; Lysenko, A.M.; Pimenov, N.V.

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Multiple antibiotic resistance of heterotrophic bacteria in the littoral zone of Lake Shira as an indicator of human impact on the ecosystem / T. I. Lobova [et al.] // Microbiological Research. - 2008. - Vol. 163, Is. 2. - P152-160, DOI 10.1016/j.micres.2006.03.014 . - ISSN 0944-5013
Кл.слова (ненормированные):
Antibiotic resistance -- Aquatic ecosystems -- Heterotrophic bacteria -- Human impact -- Monitoring -- Antibiotics -- Bacteria -- Ecosystems -- Environmental impact -- Mammals -- Antibiotic resistance -- Aquatic ecosystems -- Heterotrophic bacteria -- Materials -- antiinfective agent -- fresh water -- allochthony -- anthropogenic effect -- antibiotic resistance -- bacterium -- concentration (composition) -- heterotrophy -- intertidal environment -- monitoring -- recreational facility -- spring (season) -- summer -- animal -- article -- bacterial count -- bacterium -- drug effect -- ecosystem -- environmental monitoring -- heterotrophy -- human -- isolation and purification -- methodology -- microbiological examination -- microbiology -- multidrug resistance -- Russian Federation -- season -- Animals -- Anti-Bacterial Agents -- Bacteria -- Colony Count, Microbial -- Drug Resistance, Multiple, Bacterial -- Ecosystem -- Environmental Monitoring -- Fresh Water -- Heterotrophic Processes -- Humans -- Microbial Sensitivity Tests -- Russia -- Seasons -- Eurasia -- Khakassia -- Lake Shira -- Russian Federation -- Animalia -- Bacteria (microorganisms)
Аннотация: Resistance to Ampicillin and Kanamycin displayed by heterotrophic bacteria isolated in Summer and in Spring from the littoral and the central parts of Lake Shira (a therapeutic lake in the Khakasia Republic, Russia) has been investigated. It has been found that in Summer, human and animal microflora featuring multiple antibiotic resistance (to Ampicillin and Kanamycin) predominates in all the studied stations of the littoral zone of the lake. In Spring, concentrations of bacteria featuring multiple antibiotic resistance decrease significantly and bacteria sensitive to antibiotics predominate in the lake. Emergence of multiple antibiotic resistance in bacteria of Lake Shira is caused by the input of allochthonous bacteria into the lake; this feature of heterotrophic bacteria of Lake Shira can be used to monitor the impact on the ecosystem made by health resorts. В© 2006 Elsevier GmbH. All rights reserved.

Scopus
Держатели документа:
LTD Territory-oriented information systems, Institute of Computational Modeling, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Institute of Biophysics, Russian Academy of Sciences, Siberian Branch, Akademgorodok 50, 660036, Russian Federation
Center of Hygiene and Epidemiology in Krasnoyarsk Region, Sopochnaya 38, Russian Federation
Krasnoyarsk Scientific Centre, Akademgorodok 50, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Lobova, T.I.; Barkhatov, Y.V.; Salamatina, O.V.; Popova, L.Yu.

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Effect of winter conditions on distributions of anoxic phototrophic bacteria in two meromictic lakes in Siberia, Russia / D. Y. Rogozin [et al.] // Aquatic Ecology. - 2009. - Vol. 43, Is. 3. - P661-672, DOI 10.1007/s10452-009-9270-7 . - ISSN 1386-2588
Кл.слова (ненормированные):
Chemocline -- Green sulphur bacteria -- Purple sulphur bacteria -- Snow -- Winter -- anoxic conditions -- bacterium -- biomass -- ice cover -- light intensity -- meromictic lake -- photoautotrophy -- remote sensing -- vertical distribution -- Eurasia -- Khakassia -- Lake Shira -- Lake Shunet -- Russian Federation -- Siberia -- Bacteria (microorganisms) -- Photobacteria
Аннотация: The year-to-year variations of vertical distribution and biomass of anoxic phototrophic bacteria were studied during ice periods 2003-2005 and 2007-2008 in meromictic lakes Shira and Shunet (Southern Siberia, Russian Federation). The bacterial layers in chemocline of both lakes were sampled with a thin-layer hydraulic multi-syringe sampler. In winter, biomass of purple sulphur bacteria varied considerably depending on the amount of light penetrating into the chemocline through the ice and snow cover. In relatively weakly stratified, brackish Shira Lake, the depth of chemocline varied between winters, so that light intensity for purple sulphur bacteria inhabiting this zone differed. In Shira Lake, increased transparency of mixolimnion in winter, high chemocline position and absence of snow resulted in light intensity and biomass of purple sulphur bacteria exceeding the summer values in the chemocline of the lake. We could monitor snow cover at the lake surface using remote sensing and therefore estimate dynamics and amount of light under ice and its availability for phototrophic organisms. In Shunet Lake, the light intensities in the chemocline and biomasses of purple sulphur bacteria were always lower in winter than in summer, but the biomasses of green sulphur bacteria were similar. В© Springer Science+Business Media B.V. 2009.

Scopus
Держатели документа:
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-50, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny 79, 660071 Krasnoyarsk, Russian Federation
Center for Limnology, The Netherlands Institute of Ecology, Nieuwersluis, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Y.; Zykov, V.V.; Chernetsky, M.Y.; Degermendzhy, A.G.; Gulati, R.D.

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Vertical stratification of physical, chemical and biological components in two saline lakes Shira and Shunet (South Siberia, Russia) / A. G. Degermendzhy [et al.] // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P619-632, DOI 10.1007/s10452-010-9336-6 . - ISSN 1386-2588
Кл.слова (ненормированные):
Ciliates -- Cryptomonas -- Fishless lakes -- Gammarus -- Mathematical modelling -- Meromictic lakes -- Phytoplankton -- Stratification -- Sulphur bacteria -- amphipod -- bacterium -- biomass -- ciliate -- ecosystem modeling -- flagellate -- meromictic lake -- microbial community -- numerical model -- physicochemical property -- phytoplankton -- population density -- saline lake -- salinity -- stratification -- thermocline -- trophic interaction -- vertical profile -- zooplankton -- Khakassia -- Lake Shira -- Lake Shunet -- Russian Federation -- Siberia -- Amphipoda -- Bacteria (microorganisms) -- Ciliophora -- Copepoda -- Cryptomonas -- Cryptomonas sp. -- Gammaridae -- Gammarus -- Gammarus lacustris -- Phytomastigophorea -- Protista -- Rotifera
Аннотация: A feature of meromictic lakes is that several physicochemical and biological gradients affect the vertical distribution of different organisms. The vertical stratification of physical, chemical and biological components in saline, fishless meromictic lakes Shira and Shunet (Siberia, Russia) is quite different mainly because both mean depth and maximum depth of lakes differ as well as their salinity levels differ. The chemocline of the Lake Shira, as in many meromictic lakes, is inhabited by bacterial community consisting of purple sulphur and heterotrophic bacteria. As the depth of the chemocline is variable, the bacterial community does not attain high densities. The mixolimnion in Lake Shira, which is thermally stratified in summer, also creates different habitat for various species. The distribution of phytoplankton is non-uniform with its biomass peak in the metalimnion. The distribution of zooplankton is also heterogeneous with rotifers and juvenile copepods inhabiting the warmer epilimnion and older copepods found in the cold but oxic hypolimnion. The amphipod Gammarus lacustris which can be assigned to the higher trophic link in the fishless lake's ecosystem, such as Lake Shira, is also distributed non-uniformly, with its peak density generally observed in the thermocline region. The chemocline in Lake Shunet is located at the depth of 5 m, and unlike in Lake Shira, due to a sharp salinity gradient between the mixolimnion and monimolimnion, this depth is very stable. The mixolimnion in Lake Shunet is relatively shallow and the chemocline is inhabited by (1) an extremely dense bacterial community; (2) a population of Cryptomonas sp.; and (3) ciliate community comprising several species. As the mixolimnion of Lake Shunet is not thermally stratified for long period, the phytoplankton and zooplankton populations are not vertically stratified. The gammarids, however, tend to concentrate in a narrow layer located 1-2 m above the chemocline. We believe that in addition to vertical inhomogeneities of both physicochemical parameters, biological and physical factors also play a role in maintaining these inhomogeneities. We conclude that the stratified distributions of the major food web components will have several implications for ecosystem structure and dynamics. Trophic interactions as well as mass and energy flows can be significantly impacted by such heterogeneous distributions. Species spatially separated even by relatively short distances, say a few centimetres will not directly compete. Importantly, we demonstrate that not only bacteria, phytoflagellates and ciliate tend to concentrate in thin layers but also larger-sized species such Gammarus (amphipods) can also under certain environmental conditions have stratified distribution with maxima in relatively thin layer. As the vertical structure of the lake ecosystem is rather complex in such stratified lakes as ours, the strategy of research, including sampling techniques, should consider potentially variable and non-homogeneous distributions. В© 2010 The Author(s).

Scopus
Держатели документа:
Institute of Biophysics SB RAS, 660036 Krasnoyarsk, Akademgorodok, Russian Federation
Siberian Federal University, Svobodnyi 79, 660041 Krasnoyarsk, Russian Federation
Netherlands Environmental Assessment Agency (PBL), P.O. Box 303, 3720 AH Bilthoven, Netherlands
Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), 3631 AC Nieuwersluis, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Degermendzhy, A.G.; Zadereev, E.S.; Rogozin, D.Y.; Prokopkin, I.G.; Barkhatov, Y.V.; Tolomeev, A.P.; Khromechek, E.B.; Janse, J.H.; Mooij, W.M.; Gulati, R.D.

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10.

The vertical distribution and abundance of Gammarus lacustris in the pelagic zone of the meromictic lakes Shira and Shunet (Khakassia, Russia) / E. S. Zadereev [et al.] // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P531-539, DOI 10.1007/s10452-010-9329-5 . - ISSN 1386-2588
Кл.слова (ненормированные):
Amphipod -- Gammarus lacustris -- Meromictic lake -- Thermocline -- Vertical distribution -- abundance -- amphipod -- dissolved oxygen -- intertidal environment -- meromictic lake -- pelagic environment -- seston -- stratification -- thermocline -- vertical distribution -- videography -- water temperature -- Khakassia -- Lake Shira -- Lake Shunet -- Russian Federation -- Amphipoda -- Animalia -- Gammarus -- Gammarus lacustris
Аннотация: 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. В© 2010 Springer Science+Business Media B.V.

Scopus
Держатели документа:
Institute of Biophysics SB RAS, Krasnoyarsk, Akademgorodok 660036, Russian Federation
Siberian Federal University, Svobodnyi 79, Krasnoyarsk 660041, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Zadereev, E.S.; Tolomeyev, A.P.; Drobotov, A.V.; Emeliyanova, A.Y.; Gubanov, M.V.

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11.

Densities and distribution of flagellates and ciliates in the chemocline of saline, meromictic Lake Shunet (Siberia, Russia) / E. B. Khromechek, Y. V. Barkhatov, D. Y. Rogozin // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P497-511, DOI 10.1007/s10452-010-9332-x . - ISSN 1386-2588
Кл.слова (ненормированные):
Chemocline -- Ciliate -- Cryptomonas -- Deep chlorophyll maximum -- Diel vertical migrations -- Meromictic lakes -- anoxic conditions -- bacterium -- biomass -- chlorophyll -- ciliate -- diel migration -- flagellate -- meromictic lake -- population density -- saline lake -- seasonal variation -- vertical distribution -- zooplankton -- Khakassia -- Lake Shunet -- Russian Federation -- Siberia -- Bacteria (microorganisms) -- Ciliophora -- Cryptomonas -- Hypotrichia -- Mastigophora (flagellates) -- Oligotrichia -- Phytomastigophorea -- Prostomatida -- Scuticociliatia
Аннотация: The vertical and seasonal distributions of the phytoflagellate Cryptomonas spp., and its most common, the planktonic ciliate predators (Oligotrichida, Scuticociliatida, Hypotrichida and Prostomatida) were investigated in chemocline region of small saline, meromictic lake Shunet (Siberia, Russia) during 2003 and 2005. The lake has a pronounced chemocline, with abundance of purple and green sulphur bacteria. Vertical distribution of the Cryptomonas populations near the oxic/anoxic boundary layer was studied at close intervals in water sampled using a hydraulically operated thin-layer sampler. In both summer and winter, Cryptomonas peaked in water stratum 5-10 cm above anoxic zone or in the anoxic zone water column in the chemocline (about 5 m). Ciliate densities and biomass were also much higher in chemocline than in mixolimnion. The range of diurnal migration of Cryptomonas population was not very wide, and it was restricted to layers with high light intensity. The ciliates were sometimes detected above the upper border of the anoxic zone but also several centimetres below this zone. В© 2010 Springer Science+Business Media B.V.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch of Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Khromechek, E.B.; Barkhatov, Y.V.; Rogozin, D.Y.

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12.

Feeding spectra of Arctodiaptomus salinus (Calanoida, Copepoda) using fatty acid trophic markers in seston food in two salt lakes in South Siberia (Khakasia, Russia) / A. P. Tolomeev [et al.] // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P513-530, DOI 10.1007/s10452-010-9331-y . - ISSN 1386-2588
Кл.слова (ненормированные):
Arctodiaptomus salinus -- Brackish lakes -- Fatty acids -- Feeding spectra -- Salinity adaptation -- adaptation -- bacterium -- brackish water -- ciliate -- comparative study -- crustacean -- cyanobacterium -- fatty acid -- feeding behavior -- flagellate -- food selection -- green alga -- lipid -- physicochemical property -- picoplankton -- saline lake -- salinity -- seasonality -- seston -- Khakassia -- Russian Federation -- Siberia -- Animalia -- Arctodiaptomus salinus -- Bacillariophyta -- Bacteria (microorganisms) -- Calanoida -- Chlorophyta -- Ciliophora -- Copepoda -- Cryptomonas -- Cryptophyta -- Cyanobacteria -- Mastigophora (flagellates) -- Proteobacteria
Аннотация: During two vegetation seasons (2004-2005), we compared feeding spectra of Arctodiaptomus salinus (Calanoida, Copepoda) populations inhabiting two neighboring salt lakes, Shira and Shunet, Khakasia, Russia, using fatty acid (FA) trophic markers. Sestonic FA composition in two lakes moderately differed, whereas levels of diatom FA markers were higher in Lake Shunet and of Cyanobacteria and green algae markers in Lake Shira. In general, markers in storage lipids-triacylglycerols (TAG) of A. salinus-reflected the differences in sestonic composition of the two lakes. Nevertheless, TAG fraction was also enriched by FA trophic markers of the minor components of seston, which were selectively ingested by the animals. In Lake Shira, A. salinus had significantly higher concentrations of bacterial FA markers in TAG. In Lake Shunet, TAG of A. salinus contained significantly higher relative amounts of 18:4?3, 18:5?3 and C22 polyunsaturated fatty acids (PUFA), which indicated marked contribution of cryptophytes or (and) flagellates into the diet. Laboratory experiments showed feeding on Cryptomonas and sulfur purple bacteria in Lake Shunet and ciliates and colonial picoplankton in both lakes, and generally confirmed the differences in FA trophic markers in A. salinus between the lakes. The two populations of A. salinus markedly differed in levels of essential long-chain PUFA, eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids, although the levels of these FA in seston were quite similar between the two lakes. The higher levels of the essential ?3 PUFA in A. salinus in Lake Shunet may be an adaptive response of the animals to a vertical stratification of physico-chemical conditions and significantly higher salinity levels at the boundary of adjacent bottom layer in this lake. В© 2010 Springer Science+Business Media B.V.

Scopus
Держатели документа:
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny av. 79, 660041 Krasnoyarsk, Russian Federation
Netherlands Institute of Ecology, Department of Aquatic Ecology, Rijksstraatweg 6, 3631 AC Nieuwersluis, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Tolomeev, A.P.; Sushchik, N.N.; Gulati, R.D.; Makhutova, O.N.; Kalacheva, G.S.; Zotina, T.A.

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13.

Comparative study of Thermoresistances' cellular mechanisms in representatives of the Gammarus lacustris Sars populations inhabiting Saline Lake Shira (Republic of Khakassia) and a fresh water body in the Cis-Baikal region / Z. M. Shatilina [et al.] // Doklady Biological Sciences. - 2010. - Vol. 434, Is. 1. - P359-362, DOI 10.1134/S0012496610050182 . - ISSN 0012-4966
Кл.слова (ненормированные):
antioxidant -- catalase -- fresh water -- heat shock protein 70 -- reactive oxygen metabolite -- sea water -- Amphipoda -- animal -- article -- biosynthesis -- comparative study -- ecosystem -- heat -- metabolism -- Russian Federation -- Amphipoda -- Animals -- Antioxidants -- Catalase -- Ecosystem -- Fresh Water -- Hot Temperature -- HSP70 Heat-Shock Proteins -- Reactive Oxygen Species -- Seawater -- Siberia -- Gammarus -- Gammarus lacustris

Scopus
Держатели документа:
Institute of Biology, Irkutsk State University, ul. Lenina 3, Irkutsk 664003, Russian Federation
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation
Irkutsk State University, ul. Karla Marksa 1, Irkutsk 664003, Russian Federation
Baikal Research Centre, ul. Karla Marksa 5-10, Irkutsk 664003, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Shatilina, Z.M.; Gubanov, M.V.; Zadereev, E.S.; Pavlichenko, V.V.; Axenov-Gribanov, D.V.; Sapozhnikova, E.A.; Protopopova, M.V.; Bedulina, D.S.; Timofeyev, M.A.

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14.

A general one-dimensional vertical ecosystem model of Lake Shira (Russia, Khakasia): Description, parametrization and analysis / I. G. Prokopkin [et al.] // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P585-618, DOI 10.1007/s10452-010-9326-8 . - ISSN 1386-2588
Кл.слова (ненормированные):
Meromictic brackish lake -- One-dimensional vertical ecological model -- Sensitivity analysis -- alga -- biomass -- brackish water -- diffusion -- ecosystem modeling -- meromictic lake -- microbial community -- model test -- nutrient -- one-dimensional modeling -- parameterization -- phytoplankton -- seasonality -- sensitivity analysis -- solar radiation -- vertical profile -- water chemistry -- water temperature -- zooplankton -- Khakassia -- Lake Shira -- Russian Federation -- algae
Аннотация: A one-dimensional ecological model of the meromictic brackish Lake Shira (Russia, Khakasia) was developed. The model incorporates state-of-the-art knowledge about the functioning of the lake ecosystem using the most recent field observations and ideas from PCLake, a general ecosystem model of shallow freshwater lakes. The model of Lake Shira presented here takes into account the vertical dynamics of biomasses of the main species of algae, zooplankton and microbial community, as well as the dynamics of oxygen, detritus, nutrients and hydrogen sulphide from spring to autumn. Solar radiation, temperature and diffusion are modelled using real meteorological data. The parameters of the model were calibrated to the field data, after applying different methods of sensitivity analysis to the model. The resulting patterns of phytoplankton and nutrients dynamics show a good qualitative and quantitative agreement with the field observations during the whole summer season. Results are less satisfactory with respect to the vertical distribution of zooplankton biomass. We hypothesize that this is due to the fact that the current model does not take the sex and age structure of zooplankton into account. The dynamics of oxygen, hydrogen sulphide and the modelled positions of the chemocline and thermocline are again in good agreement with field data. This resemblance confirms the validity of the approach we took in the model regarding the main physical, chemical and ecological processes. This general model opens the way for checking various hypotheses on the functioning of the Lake Shira ecosystem in future investigations and for analysing options for management of this economically important lake. В© 2010 Springer Science+Business Media B.V.

Scopus
Держатели документа:
Institute of Biophysics, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Netherlands Institute of Ecology, Centre for Limnology, Rijksstraatweg 6, 3631 AC Nieuwersluis, Netherlands
Netherlands Environmental Assessment Agency (PBL), Postbus 303, 3720 AH Bilthoven, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Prokopkin, I.G.; Mooij, W.M.; Janse, J.H.; Degermendzhy, A.G.

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15.

Microbial community of the chemocline of the meromictic Lake Shunet (Khakassia, Russia) during summer stratification / D. Y. Rogozin [et al.] // Microbiology. - 2010. - Vol. 79, Is. 2. - P253-261, DOI 10.1134/S0026261710020189 . - ISSN 0026-2617
Кл.слова (ненормированные):
Chemocline -- Cyanobacteria -- Green sulfur bacteria -- Meromictic lakes -- Microstratification -- PCR-DGGE -- Phytoflagellates -- Purple sulfur bacteria -- Bacteria (microorganisms) -- Chlorobi -- Chromatiaceae -- Cryptomonas -- Cyanobacteria -- Lamprocystis purpurea -- Phytomastigophorea -- Proteobacteria -- Synechococcus
Аннотация: The spatio-temporal organization of the bacterial community inhabiting the chemocline of the stratified meromictic Lake Shunet (Khakassia, Russia) was investigated from May to September 2005 by means of microscopy, analysis of photosynthetic pigments, and PCR-DGGE with subsequent 16S rDNA analysis. The samples were collected with a multisyringe stratification sampler, sampling being performed every 5 cm. It was demonstrated that, during the period of investigation, there were no large changes in the bacterial community of the chlemocline, at least among the detected forms. During the whole period of study, purple sulfur bacteria related to Lamprocystis purpurea (Chromatiaceae) were predominant in the chemocline. Beneath the layer of purple bacteria, green sulfur bacteria were revealed that were phylogenetically distant from strain ShNPel02, which was previously isolated from this lake. Development of phytoflagellates of the genus Cryptomonas was observed in the upper zone of the chemocline. In the chemocline of Lake Shunet, the numbers of picoplankton cyanobacteria of the genus Synechococcus increased from May to September. It was demonstrated that the application of universal bacterial primers for DGGE resulted in the same qualitative distributional pattern of predominant species as microscopic studies. В© Pleiades Publishing, Ltd., 2010.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi, 79, Krasnoyarsk 660041, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Y.; Trusova, M.Y.; Khromechek, E.B.; Degermendzhy, A.G.

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16.

Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002-2009 / D. Y. Rogozin [et al.] // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P485-496, DOI 10.1007/s10452-010-9328-6 . - ISSN 1386-2588
Кл.слова (ненормированные):
1-D model -- Meromixis -- Mixolimnion -- Oxic-anoxic interface -- Thermocline -- Weather conditions -- brackish water -- meromictic lake -- numerical model -- one-dimensional modeling -- overturn -- physicochemical property -- salinity -- seasonality -- stratification -- temperate environment -- vertical mixing -- water temperature -- weather -- Khakassia -- Lake Shira -- Russian Federation
Аннотация: 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. В© 2010 The Author(s).

Scopus
Держатели документа:
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-50, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny 79, 660071 Krasnoyarsk, Russian Federation
Institute of Computational Modeling of Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-50, 660036 Krasnoyarsk, Russian Federation
The Netherlands Institute of Ecology, Center for Aquatic Ecology, Nieuwersluis, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Y.; Genova, S.N.; Gulati, R.D.; Degermendzhy, A.G.

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17.

A one-dimensional model of vertical stratification of Lake Shira focussed on winter conditions and ice cover / S. N. Genova [et al.] // Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - P571-584, DOI 10.1007/s10452-010-9327-7 . - ISSN 1386-2588
Кл.слова (ненормированные):
Convective mixed layer -- Ice formation -- Ice melting -- Simplified model -- Winter profiles -- anoxic conditions -- hydrogen sulfide -- ice cover -- inhomogeneity -- meromictic lake -- numerical model -- one-dimensional modeling -- pycnocline -- salinity -- seasonality -- stratification -- vertical profile -- water column -- water temperature -- Khakassia -- Lake Shira -- Russian Federation
Аннотация: In meromictic lakes such as Lake Shira, horizontal inhomogeneity is small in comparison with vertical gradients. To determine the vertical distribution of temperature, salinity, and density of water in a deep zone of a Lake Shira, or other saline lakes, a one-dimensional (in vertical direction) mathematical model is presented. A special feature of this model is that it takes into account the process of ice formation. The model of ice formation is based on the one-phase Stefan problem with the linear temperature distribution in the solid phase. A convective mixed layer is formed under an ice cover due to salt extraction in the ice formation process. To obtain analytical solutions for the vertical distribution of temperature, salinity, and density of water, we use a scheme of vertical structure in the form of several layers. In spring, the ice melts as top and bottom. These processes are taken into account in the model. The calculated profiles of salinity and temperature of Shira Lake are in good agreement with field measurement data for each season. Additionally, we focussed on the redox zone, which is the zone in which the aerobic layers of a water column meet the anaerobic ones. Hyperactivity of plankton communities is observed in this zone in lakes with hydrogen sulphide monimolimnion, and Lake Shira is among them. The location of the redox zone in the lake, which is estimated from field measurements, coincides with a sharp increase in density (the pycnocline) during autumn and winter. During spring and summer, the redox zone is deeper than the pycnocline. The location of pycnocline calculated with the hydro physical model is in good agreement with field measurement data. В© 2010 Springer Science+Business Media B.V.

Scopus
Держатели документа:
Institute of Computational Modeling SB RAS, Akademgorodok 50/44, Krasnoyarsk 660036, Russian Federation
Krasnoyarsk, Siberian Federal University, Institute of Mathematics, Svobodny 79, Krasnoyarsk 660041, Russian Federation
Institute of Biophysics SB RAS, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Federal University, Institute of Mathematics, Svobodny 79, Krasnoyarsk 660041, Russian Federation
Netherlands Institute of Ecology, Center for Limnology, Rijksstraatweg 6, Nieuwersluis 3631 AC, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Genova, S.N.; Belolipetskii, V.M.; Rogozin, D.Y.; Degermendzhy, A.G.; Mooij, W.M.

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18.

Physicochemical conditions of seasonal carbonate precipitation in Shira lake (Khakasia) / G. A. Tret'Yakov [et al.] // Doklady Earth Sciences. - 2012. - Vol. 446, Is. 1. - P1099-1101, DOI 10.1134/S1028334X12090152 . - ISSN 1028-334X
Кл.слова (ненормированные):
carbonate sediment -- lacustrine deposit -- physicochemical property -- precipitation (chemistry) -- Khakassia -- Lake Shira -- Russian Federation

Scopus
Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Tret'Yakov, G.A.; Kalugin, I.A.; Dar'In, A.V.; Rogozin, D.Yu.; Degermendzhi, A.G.

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19.

Carotenoids in bottom sediments of lake Shira as a paleoindicator for reconstruction of Lake States in Khakassiya, Russia / V. V. Zykov [et al.] // Contemporary Problems of Ecology. - 2012. - Vol. 5, Is. 4. - P434-442, DOI 10.1134/S199542551204018X . - ISSN 1995-4255
Кл.слова (ненормированные):
anaerobiosis -- bottom sediments -- holomixis -- meromixis -- okenone -- bacterium -- bioindicator -- biomarker -- carotenoid -- Holocene -- lacustrine deposit -- meromixis -- molecular analysis -- paleoclimate -- photoautotrophy -- reconstruction -- Khakassia -- Lake Shira -- Russian Federation
Аннотация: The concentrations of carotenoids buried in the bottom sediments of Lake Shira (Siberia, Khakassiya) have analyzed for the period of the last 2300 years. The bottom sediments were found to contain carotenoids, which are molecular markers of the corresponding groups of Phototrophic organisms. The bottom sediments of Lake Shira were shown to be a promising object for climate reconstructions of the Late Holocene in southern Siberia. В© 2012 Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 5, build. 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Acedemika Koptyuga pr. 3, Novosibirsk 630090, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Zykov, V.V.; Rogozin, D.Y.; Kalugin, I.A.; Dar'in, A.V.; Degermendzhi, A.G.

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20.

Ecology of purple sulfur bacteria in the highly stratified meromictic Lake Shunet (Siberia, Khakassia) in 2002-2009 / D. Y. Rogozin, V. V. Zykov, A. G. Degermendzhi // Microbiology (Russian Federation). - 2012. - Vol. 81, Is. 6. - P727-735, DOI 10.1134/S0026261712060148 . - ISSN 0026-2617
Кл.слова (ненормированные):
bacteriochlorophyll a -- chemocline -- meromictic lake -- purple sulfur bacteria -- seasonal dynamics -- Bacteria (microorganisms) -- Chromatiaceae
Аннотация: Phototrophic sulfur bacteria form dense accumulations in the chemocline zones of stratified lakes where light reaches the sulfide-containing layers of water. Many works are dedicated to the ecophysiology of these microorganisms in meromictic lakes. However, the role of these microorganisms in the trophic network of these ecosystems, the ways of biomass utilization, and the contribution to the turnover of biogenic elements have so far been insufficiently understood. This work deals with the analysis of many years' seasonal dynamics of the biomass of purple sulfur bacteria and the physicochemical conditions of their environment in Lake Shunet (Siberia, Khakassia, Russia), unraveling the causes of their anomalous development in the chemocline of this lake, as well as the comparative analysis of such type of ecosystems. Lake Shunet is characterized by markedly pronounced stratification and the high density of purple sulfur bacteria (PSB) in the chemocline, which is comparable to that of Lake Mahoney (Canada) where the number of PSB is the greatest among those known in the world. It was shown that, in the period 2002-2009, the total amount of bacterio-chlorophyll a in the water column of Lake Shunet increased and did not correlate with the seasonal variations in temperature and illumination in the chemocline. It was established that PSB cells in the purple layer experienced the effect of self-shading. The sedimentation rate of purple sulfur bacteria in Lake Shunet was low due to the pronounced density gradient in the chemocline zone. Thus, the high number of PSB in the chemocline was due to the combination of strong illumination, a high sulfide concentration, and a high water density gradient, which was responsible for stable stratification and contributed to the accumulation of the cells in a narrow layer. The data obtained could be useful for the paleoreconstruction of climatically deter-mined changes in the level of the lake and its periods of meromixis by the presence of carotenoids and bacte-riochlorophylls in the bottom sediments. В© 2012 Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Y.; Zykov, V.V.; Degermendzhi, A.G.

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