Lake Shira, a Siberian salt lake: ecosystem structure and function

Зотина, Т. А.; Tolomeyev, Alexander P.; Degermendzhy, Nadezhda N.

doi:10.1007/bf02449932

Cited by 28 publications

(23 citation statements)

References 3 publications

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“…Studies of pelagic communities in lakes are often focused on the vertical structure of the plankton, the vertical distribution of which reflects physiological, behavioral and ecological preferences of organisms. Lake Shira and Lake Shunet (Khakassia, Russia) are meromictic lakes (Zotina et al 1999;Rogozin et al 2009), where Gammarus is one of the few dominant species among zooplankton. Yemelyanova et al (2002) have been shown that in Lake Shira the highest densities of Gammarus occur in sublittoral area.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…A detailed description of the reservoir and its ecosystem can be found in the work of Zotina et al (1999), Gaevsky et al (2002), Kalacheva et al (2002), Kopylov et al (2002b), Rogozin et al (2009).…”

Section: Description Of Shira Lakementioning

confidence: 99%

“…The use of this reservoir as the popular recreation place and its balneological properties put special constraints on its water quality. During recent years, several studies on the structure and functioning of Lake Shira were performed (Zotina et al 1999;Gaevsky et al 2002;Kalacheva et al 2002;Kopylov et al 2002b) and a first mathematical model of the lake's ecosystem was created .…”

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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“…During the summer period Lake Shira is a stratified water body with heterogeneous distribution of zooplankton (Zotina et al 1999). Calanoid copepods Arctodiaptomus salinus and rotifers Brachionus plicatilis are the dominant species accounting for 95% of the total zooplankton biomass (Zotina et al 1999). The representative of bentho-plankton is the amphipod Gammarus lacustris (Yemelyanova et al 2002).…”

Section: Methodsmentioning

confidence: 99%

An in situ method for the investigation of vertical distributions of zooplankton in lakes: test of a two-compartment enclosure

Tolomeyev

Zadereev

2005

Aquat Ecol

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Two-section enclosures were designed for the investigation of the effect of various physicochemical and biological factors on vertical distribution of zooplankton in situ. The framework of the enclosure was a cylindrical polyethylene column without any partitions inside, in which the isolation of animals in different sections after in situ exposure was achieved by pinching the flexible central part of the column. Enclosures were tested at the brackish stratified meromictic Lake Shira (Russia, Khakasia). The absence of fish and carnivorous zooplankton in the lake suggests that the vertical distribution of zooplankton is mainly determined by physicochemical gradients in the water column. Experiments and field observations demonstrated that all age and size groups of Arctodiaptomus salinus and Brachionus plicatilis strongly avoided surface layers during the daylight. The escape of zooplankton from the anoxic hypolimnion was less active. Statistically significant avoidance was observed only for copepodites C4-C5 and females of A. salinus. The relatively simple construction of the columns and easy handling during the experiment were the factors that favoured the use of this device to perform in situ basic tests of the effect of different factors on the vertical distribution of zooplankton.

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Lake Shira, a Siberian salt lake: ecosystem structure and function

Cited by 28 publications

References 3 publications

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

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

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

An in situ method for the investigation of vertical distributions of zooplankton in lakes: test of a two-compartment enclosure

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