Thin-layer vertical distributions of purple sulfur bacteria in chemocline zones of meromictic lakes Shira and Shunet (Khakassia)

Rogozin, D. Yu.; Пименов, Н. В.; Косолапов, Д. Б.; Chan’kovskaya, Yu. V.; Degermendzhy, Andrey G.

doi:10.1007/s10630-005-0042-9

Cited by 18 publications

(25 citation statements)

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“…Degermendzhy et al 2002;Gaevsky et al 2002;Rogozin et al 2005;Tolomeyev et al 2006;Zadereev and Tolomeyev 2007) on the vertical structure of L. Shira and L. Shunet, our knowledge on the food web interactions and mass and energy flows is rather scanty. We still do not have a good grasp of the impact of microbial Gammarus lacustris t = 6-10°C H2S ca.…”

Section: Discussionmentioning

confidence: 99%

“…The ciliate abundance (50-400 cells ml -1 ) in the chemocline was an order lower; the community in the pelagic zone clearly preferred the 10-35 cm layer of the chemocline, above or in the layer of PSB where the H 2 S level varied from 0 to 5 mg l -1 .The community does not seem to migrate, but with a diel maximum somewhat higher than that of Cryptomonas spp. Large populations of these flagellates in the chemocline is perhaps related to the co-occurrence of dense population of PSB (Rogozin et al 2005(Rogozin et al , 2009(Rogozin et al , 2010a. A flow of nutrients from the lake bottom is needed to maintain such densities of bacteria and the flagellates.…”

Section: Stratification Of Phytoflagellates and Ciliatesmentioning

confidence: 99%

“…mainly because monimolimnion is anoxic. To answer the question if presence of Gammarus in the pelagic part is consistent with its habitat requirements, especially depth preference, we monitored the vertical distribution of this amphipod in the centre of the lakes employing video surveillance system during summer stratification in 2005(Zadereev et al 2010). Gammarus appears to be distributed non-homogenously during summer stratification, with a stable peak in the metalimnion (Fig.…”

Section: Gammarus Lacustris: Its Adaptations To Living In Pelagic Zonmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Stratification Of Phytoflagellates and Ciliatesmentioning

confidence: 99%

Section: Gammarus Lacustris: Its Adaptations To Living In Pelagic Zonmentioning

confidence: 99%

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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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“…Green algae dominated by Dictyosphaerium tetrachotomum comprised only 10% (0.03 mg l -1 ) of total phytoplankton biomass. Purple and green phototrophic bacteria were highly abundant (their total density-10 8 cells ml -1 ) and formed a thin layer of about 5 cm in the chemocline zone (Rogozin et al 2005). A diverse microorganism community, comprising ciliates Strombidium and Cyclidium spp., and autotrophic flagellates Cryptomonas sp.…”

Section: Study Sitementioning

confidence: 99%

Feeding spectra of Arctodiaptomus salinus (Calanoida, Copepoda) using fatty acid trophic markers in seston food in two salt lakes in South Siberia (Khakasia, Russia)

et al. 2010

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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. salinusreflected 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 18:4x3, 18:5x3 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 x3 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.

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“…Lake Shira is a promising object for studying from different the above-mentioned perspectives. Although Lake Shira has been intensively investigated during the last decade (Degermendzhy et al 2002;Rogozin et al 2005Rogozin et al , 2009; and many others), the mixing behavior and long-term annual dynamics of physical-chemical stratification, as well as the effect of weather conditions on year-to-year variation of the lake stratification, have not been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002–2009

et al. 2010

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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.

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Thin-layer vertical distributions of purple sulfur bacteria in chemocline zones of meromictic lakes Shira and Shunet (Khakassia)

Cited by 18 publications

References 6 publications

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

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

Feeding spectra of Arctodiaptomus salinus (Calanoida, Copepoda) using fatty acid trophic markers in seston food in two salt lakes in South Siberia (Khakasia, Russia)

Some generalizations based on stratification and vertical mixing in meromictic Lake Shira, Russia, in the period 2002–2009

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