Anoxygenic phototrophic bacterial community of Lake Shira (Khakassia)

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

doi:10.1134/s0026261707040133

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…In Shira Lake, several studies (Kopylov et al 2002a;Gaevsky et al 2002;Pimenov et al 2003;Lunina et al 2007b, this study) have substantiate that thermocline is formed in summer at 6-8 m depth. Since the chemocline is always positioned 4-8 m deeper below thermocline, thermal stratification prevents chemocline waters from warming-up during summer.…”

Section: Discussionsupporting

confidence: 67%

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

et al. 2009

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Section: Discussionsupporting

confidence: 67%

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

et al. 2009

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“…Lake Shunet seems to be comparable with Mahoney for very high PSB biomass, depth position of the chemocline, sharp density gradient. In both lakes, PSB forms similar to Lamprocystis purpurea dominate (Lunina et al 2007;Rogozin et al 2010a, b). However, in Lake Shira, the density of PSB population usually was only about one-hundredth of that in Lake Shunet.…”

Section: Lakes Descriptionmentioning

confidence: 99%

Vertical stratification of physical, chemical and biological components in two saline lakes Shira and Shunet (South Siberia, Russia)

et al. 2010

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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 123Aquat Ecol (2010) 44:619-632 DOI 10.1007 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 var...

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“…The first aim of this study is to accumulate in the new model the latest insights into the structure and functioning of Lake Shira resulting from recent investigations (Pimenov et al 2003;Tolomeyev et al 2006;Lunina et al 2007;Zadereev and Tolomeyev 2007;Rogozin et al 2009). The second aim is to introduce to a more advanced hydrodynamical algorithm (Belolipetsky et al 2010) and new algorithms for modelling phytoplankton, zooplankton, nutrients and detritus, on basis of PCLake (Janse 2005).…”

Section: Introductionmentioning

confidence: 99%

A general one-dimensional vertical ecosystem model of Lake Shira (Russia, Khakasia): description, parametrization and analysis

et al. 2010

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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.

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Anoxygenic phototrophic bacterial community of Lake Shira (Khakassia)

Cited by 11 publications

References 11 publications

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

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

Vertical stratification of physical, chemical and biological components in two saline lakes Shira and Shunet (South Siberia, Russia)

A general one-dimensional vertical ecosystem model of Lake Shira (Russia, Khakasia): description, parametrization and analysis

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