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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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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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Understanding the mechanisms of blooming of phytoplankton in Lake Shira, a saline lake in Siberia (the Republic of Khakasia) / A. G. Degermendzhy, R. D. Gulati // Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - P331-340 . - ISSN 1386-2588
Кл.слова (ненормированные):
Carbon budget -- Cyanobacteria -- Heterotrophic bacteria -- Hydrogen sulphide -- Mathematical models of stratification -- Meromictic lakes -- Microbial loop -- Stratification -- Trophic scheme -- algal bloom -- ecosystem modeling -- limiting factor -- nutrient availability -- phytoplankton -- saline lake -- trophic interaction -- Russian Federation -- algae -- Bacteria (microorganisms) -- Cyanobacteria -- Lyngbya -- Lyngbya contorta
Аннотация: The paper summarises the results of a three-year research study (European Union Grant: INTAS 97-0519) aimed at investigating the planktonic populations and trophic organization of the Lake Shira ecosystem - a saline lake in Khakasia, Siberia. The lake exhibits a stable summer-autumn stratification of the chemical-biological components. The mechanisms responsible for the 'blooming' of phytoplankton in the deeper layers were investigated in greater detail, using data from both field and laboratory experiments. The spectra of nutrition were examined to estimate the relationships between the specific growth rates of the hydrobionts and the influence of the limiting factors: light, nutrients. The observed heterotrophic capability of a metalimnetic phytoplankton population might help explain the development in the deeper waters of Lyngbya contorta. The scheme of trophic interactions was put up, based on the assessment of the carbon pools and carbon flows in the pelagic zone of the lake. A mathematical model of the vertical structure of the lake's plankton populations was constructed, using the ecosystem description and data of vertical turbulent diffusion. The role of light and nutrient limitations and grazing mortality in forming the vertical inhomogeneities, particularly in lowering the depth of the maximal cyanobacterial biomass, has been demonstrated. The theoretical curves for the stratification of chemical and biological parameters have been brought in conformity with the field observations, e.g. for the different patterns of the peaks, and for the biomass maxima of cyanobacteria, purple and green sulphur bacteria, oxygen, and hydrogen sulphide. The calculations revealed that for an adequate assessment of the parameters for the hydrogen sulphide zone it is necessary to introduce flows of allochthonous organic matter. Based on the form of the sulphur distribution curve, the allochthonous input of organic matter and the inflow of hydrogen sulphide from the bottom have been theoretically discriminated for the first time. It has also been ascertained that irrespective of the depth the allochthonous substances limiting bacterial growth, the bacteria are uniformly distributed over depth and can serve as an indicator of the presence of limitation (the effect of autostabilisation in space). Of indisputable interest to limnology are the specific methods developed for understanding the functioning of Lake Shira ecosystem. These include the autostabilisation of the limiting factors, the on-the-spot fluorescent method of determining the three classes of microalgae, the algal mixotrophy and the planktonic population interactions and feedbacks, and development of a more sensitive, bioluminescent method for mapping the nonhomogeneities. Owing to a balanced combination of classical approaches (field observations, in situ data on production-decomposition) and the more recent ones (satellite monitoring, biophysical methods of estimating interactions of populations, mathematical models based on the field and experimental data), many of the structural-function relationships in the ecosystem can now be explained, and the models can provide 'mutual control and mutual agreement' between the data collected using different approaches.

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

Доп.точки доступа:
Degermendzhy, A.G.; Gulati, R.D.

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Formation of the vertical heterogeneity in the Lake Shira ecosystem: The biological mechanisms and mathematical model / A. G. Degermendzhy [et al.] // Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - P271-297, DOI 10.1023/A:1015621508971 . - ISSN 1386-2588
Кл.слова (ненормированные):
Hydrogen sulphide -- Phytoplankton -- Stratification control -- Sulphate-reducing bacteria -- Sulphur cycle -- Vertical model -- biological production -- community structure -- ecosystem modeling -- nutrient cycling -- plankton -- saline lake -- seasonal variation -- vertical distribution -- Russian Federation -- algae -- Arctodiaptomus -- Bacteria (microorganisms) -- Calanoida -- Chlorophyta -- Copepoda -- Crustacea -- Cyanobacteria -- Dictyosphaerium -- Lyngbya -- Lyngbya contorta
Аннотация: Data on the seasonal changes in vertical heterogeneity of the physical-chemical and biological parameters of the thermally stratified Shira Lake ecosystem (Khakasia, Siberia) in 1996-2000 have been analyzed. The interaction mechanisms involving: (1) The plankton populations in aerobic and anaerobic zones, involving the cycling of carbon and sulphur, (2) the primary production limitation (by light and phosphorus) and inhibition (by light), and (3) the kinetic characteristics of plankton populations have been elucidated. A mathematical model of the vertical structure of the lake's plankton populations, based on the ecosystem description and on vertical turbulent diffusion of the matter, has been constructed. The green alga Dictyosphaerium tetrachotomum (Chlorophyta) and the cyanobacterium Lyngbya contorta (Cyanophyta), which dominated the phytoplankton biomass, were taken as oxygen producers. Arctodiaptomus salinus (a calanoid copepod) has been assumed as the main grazer in Shira Lake as it dominated the zooplankton biomass. Four groups of microorganisms involved in the sulphur cycle formation have been distinguished: sulphur, sulphur purple, sulphur green and SRB. H2S is oxidized to sulphate (only the green sulphur bacteria oxidize it to sulphur), and sulphate is reduced to H2S, forming neither sulphur nor its water-soluble compounds. The role of grazing, light and nutrient limitation, in forming the vertical inhomogeneities, particularly in lowering the depth of the maximal cyanobacterial biomass, has been demonstrated. When the model takes into account both light limitation and nutrient limitation of algal growth by P and consumption of algae by crustaceans: (a) in the scenario where the P is formed only by the cycling and decomposition of autochthonous organic matter, both the green algae and cyanobacteria are eliminated; (b) in the scenario involving an additional P flux in the deep water layers the peak of the cyanobacteria is at a depth of 10 m, and its amplitude is close to the one observed in the lake. The position of the peak remains stable owing to the 'double' limitation mechanism: light 'from above' and P 'from below'. Another mechanism responsible for the deep position of the peak of cyanobacteria was analyzed mathematically based on the model involving the experimentally proven assumption of the growth inhibition by light in the epilimnion and the light limitation in the hypolimnion. The main result is: the peak is positioned stable at its depth and does not change with time. The analytical and numerical calculations made for this positioning mechanism yielded the formulae relating the depth of the maximum of algal biomass, the 'width' of the peak base and the peak amplitude and a number of parameters (algae elimination, turbulent diffusion coefficient, sedimentation rate, light extinction coefficient and light intensity). The theoretical curves for the stratification of chemical and biological parameters have been brought in conformity with field observations, e.g. for the different patterns for the peaks, and the biomass maxima of cyanobacteria, purple and green sulphur bacteria, oxygen, and hydrogen sulphide. The calculations revealed that for an adequate assessment of the parameters for the hydrogen sulphide zone it is necessary to introduce flows of allochthonous organic matter. For the first time, theoretically, based on the form of the sulphur distribution curve, the allochthonous input of organic matter and the inflow of hydrogen sulphide from the bottom have been discriminated. The theoretical limit for the depth up to which the hydrogen-sulphide zone can ascend under the impact of allochthonous organic loading, has been determined.

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

Доп.точки доступа:
Degermendzhy, A.G.; Belolipetsky, V.M.; Zotina, T.A.; Gulati, R.D.

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Interaction coefficients in the Lake Shira algal-bacterial community / V. V. Adamovich, T. A. Zotina, A. G. Degermendzhy // Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - P261-270, DOI 10.1023/A:1015638420766 . - ISSN 1386-2588
Кл.слова (ненормированные):
Bacterioplankton -- Feedback coefficient -- Influence coefficient -- Phytoplankton -- Specific growth rate -- bacterioplankton -- interspecific interaction -- microbial community -- phytoplankton -- quantitative analysis -- saline lake -- Russian Federation -- algae -- Bacteria (microorganisms)
Аннотация: A new method is proposed to evaluate the interaction coefficients in microbial communities interacting due to physical-chemical environmental factors. This method differs from the classical one suggested by E.P.Odum. Redefinition of the interaction coefficients allows the evaluation of the experimental (actual) and theoretical values of the coefficients for the hypothetical interaction layout. The interaction layout is considered to be a set of factors, the values of their transformation ratios and the form of dependence of a population's specific growth rate on these factors. A comparison of theoretical and experimental values of interaction coefficients enables us to assess the adequacy of the hypothetical interaction scheme in the microbial communities. The aim of the work is to test the suggested method on a natural algal-bacterial community of Shira Lake (Khakasia, Russia), which has been the object of detailed and concerted limnological studies and for which detailed data are available. Feedback coefficients of phyto- and bacterioplankton and the coefficients of influence of phytoplankton on bacterioplankton have been defined. Dominance of negative experimental IC values has been experimentally shown, which is indicative of the negative feedback in bacterio- and phytoplankton links of Shira Lake and of negative interpopulation (phytoplankton on bacterioplankton) interactions. The considerable differences observed between the experimental and theoretical coefficients indicates inadequacy of the assumed interaction layout of the community under study. Further investigations are needed to provide a precise sketch of the interactions.

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

Доп.точки доступа:
Adamovich, V.V.; Zotina, T.A.; Degermendzhy, A.G.

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Growth of dominant zooplankton species feeding on plankton microflora in Lake Shira / T. A. Temerova, A. P. Tolomeyev, A. G. Degermendzhy // Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - P235-243, DOI 10.1023/A:1015607304508 . - ISSN 1386-2588
Кл.слова (ненормированные):
Arctodiaptomus salinus -- Brachionus plicatilis -- Life history -- Reproduction -- Specific growth rate -- diet -- food limitation -- growth rate -- life history -- reproduction -- saline lake -- zooplankton -- Russian Federation -- algae -- Arctodiaptomus -- Bacteria (microorganisms) -- Brachionus -- Brachionus plicatilis -- Calanoida -- Copepoda -- Cyanobacteria -- Invertebrata -- Rotifera
Аннотация: Batch cultures and continuous flow cultures were used to study the growth rates of zooplankton species from Shira lake, the rotifer Brachionus plicatilis Muller and calanoid copepod Arctodiaptomus salinus Daday, which were fed on phytoplankton and bacterioplankton from the lake. Analyses of the birth and survival rates were used to demonstrate that the lake phytoplankton, consisting mostly of cyanobacteria and diatomaceous algae, is inadequotes for optimal realisation of the reproductive potential of B. plicatilis when compared with the bacterial diet. The study revealed that the kinetic growth characteristics of the two zooplankters were similar: B. plicatilis rmax, 0.120 d-1; S0, 0.253; and Ks, 0.114 mg dry mass l-1; and for A. salinus rmax, 0.129 d-1; S0, 0.240; and Ks, 0.171 mg dry mass l-1. Fluctuations in natural food concentration reduced the growth rate of both species. Even though the threshold concentration of food for B. plicatilis and A. salinus were quite similar, the copepods were less sensitive to food limitation.

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

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

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Assessment of 241Am accumulation rate by samples of algobacterial community of the Yenisei River. / A. Y. Bolsunovsky, T. A. Zotina, S. V. Kosinenko // Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections / translated from Russian. - 2002. - Vol. 385. - P374-376 . - ISSN 0012-4966
Кл.слова (ненормированные):
americium -- fresh water -- alga -- animal -- article -- bacterium -- kinetics -- metabolism -- nuclear reactor -- phytoplankton -- Russian Federation -- Algae -- Americium -- Animals -- Bacteria -- Fresh Water -- Kinetics -- Nuclear Reactors -- Phytoplankton -- Russia

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

Доп.точки доступа:
Bolsunovsky, A.Y.; Zotina, T.A.; Kosinenko, S.V.

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Spatial distribution of resting stages (akinetes) of the cyanobacteria Anabaena flos-aquae in sediments and its influence on pelagic populations / E. S. Kravchuk, E. A. Ivanova, M. I. Gladyshev // Marine and Freshwater Research. - 2011. - Vol. 62, Is. 5. - P450-461, DOI 10.1071/MF10256 . - ISSN 1323-1650
Кл.слова (ненормированные):
cyanobacterial blooms -- harmful algae -- reservoir -- resting stages -- sediment management -- water quality -- abundance -- bioaccumulation -- biomass -- cyanobacterium -- environmental factor -- experimental study -- green alga -- inoculation -- littoral environment -- macrophyte -- pelagic environment -- phytoplankton -- population structure -- qualitative analysis -- recruitment (population dynamics) -- reservoir -- seasonal variation -- sediment analysis -- silt -- spatial distribution -- vertical distribution -- water quality -- Siberia -- algae -- Anabaena flos-aquae -- Cyanobacteria
Аннотация: Recruitment of pelagic populations of cyanobacteria from littoral bottom sediments is assumed to be one of the key factors for the development of harmful blooms. Therefore, it is necessary to obtain more information on the possible factors influencing the spatial distribution of the resting stages in littoral bottom sediments. To test the hypothesis that akinete abundances in littoral bottom sediments are associated with silt and the presence of higher water plants, we sampled spatial and vertical distribution and seasonal dynamics of akinetes of cyanobacterium Anabaena flos-aquae in a small Siberian reservoir. We found that akinetes accumulate in silt at stations located in macrophyte beds. Two experiments were carried out to test if there is relationship between size of inoculum and size of the pelagic population of A. flos-aquae. The proportion of A. flos-aquae in total phytoplankton biomass depended on the initial abundance of akinetes in bottom sediments. The model based on laboratory experiments gave good qualitative description of the field data. These findings can be useful to predict the location of the main akinete accumulation zones in a water body and plan the removal of sediment to prevent the cyanobacterial blooms. В© CSIRO 2011.

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

Доп.точки доступа:
Kravchuk, E.S.; Ivanova, E.A.; Gladyshev, M.I.

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Efficiency of transfer of essential polyunsaturated fatty acids versus organic carbon from producers to consumers in a eutrophic reservoir / M. I. Gladyshev [et al.] // Oecologia. - 2011. - Vol. 165, Is. 2. - P521-531, DOI 10.1007/s00442-010-1843-6 . - ISSN 0029-8549
Кл.слова (ненормированные):
Phytoplankton -- Production -- PUFA -- Trophic level -- Zooplankton -- carbon -- fresh water -- unsaturated fatty acid -- biomass -- eutrophic environment -- fatty acid -- net primary production -- organic carbon -- paradigm shift -- phytoplankton -- reservoir -- secondary production -- trophic level -- zooplankton -- animal -- article -- eutrophication -- food chain -- functional food -- growth, development and aging -- metabolism -- phytoplankton -- season -- zooplankton -- Animals -- Carbon -- Eutrophication -- Fatty Acids, Unsaturated -- Food Chain -- Fresh Water -- Functional Food -- Phytoplankton -- Seasons -- Zooplankton -- Animalia
Аннотация: One of the central paradigms of ecology is that only about 10% of organic carbon production of one trophic level is incorporated into new biomass of organisms of the next trophic level. Many of energy-yielding compounds of carbon are designated as 'essential', because they cannot be synthesized de novo by consumers and must be obtained with food, while they play important structural and regulatory functions. The question arises: are the essential compounds transferred through trophic chains with the same efficiency as bulk carbon? To answer this question, we measured gross primary production of phytoplankton and secondary production of zooplankton and content of organic carbon and essential polyunsaturated fatty acids of ?-3 family with 18-22 carbon atoms (PUFA) in the biomass of phytoplankton and zooplankton in a small eutrophic reservoir during two summers. Transfer efficiency between the two trophic levels, phytoplankton (producers) and zooplankton (consumers), was calculated as ratio of the primary production versus the secondary (zooplankton) production for both carbon and PUFA. We found that the essential PUFA were transferred from the producers to the primary consumers with about twice higher efficiency than bulk carbon. In contrast, polyunsaturated fatty acids with 16 carbon atoms, which are synthesized exclusively by phytoplankton, but are not essential for animals, had significantly lower transfer efficiency than both bulk carbon, and essential PUFA. Thus, the trophic pyramid concept, which implicitly implies that all the energy-yielding compounds of carbon are transferred from one trophic level to the next with the same efficiency of about on average 10%, should be specified for different carbon compounds. В© 2010 Springer-Verlag.

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

Доп.точки доступа:
Gladyshev, M.I.; Sushchik, N.N.; Anishchenko, O.V.; Makhutova, O.N.; Kolmakov, V.I.; Kalachova, G.S.; Kolmakova, A.A.; Dubovskaya, O.P.

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10.

Correlations between fatty acid composition of seston and zooplankton and effects of environmental parameters in a eutrophic Siberian reservoir / M. I. Gladyshev [et al.] // Limnologica. - 2010. - Vol. 40, Is. 4. - P343-357, DOI 10.1016/j.limno.2009.12.004 . - ISSN 0075-9511
Кл.слова (ненормированные):
Eicosapentaenoic acid -- Fatty acids -- Phytoplankton -- Temperature -- Zooplankton -- canonical analysis -- correlation -- eutrophic environment -- fatty acid -- multivariate analysis -- phytoplankton -- seasonal variation -- seston -- taxonomy -- temperature effect -- water temperature -- zooplankton -- algae -- Bacillariophyta -- Ciliophora -- Cyanobacteria -- Cyclopoida -- Rotifera
Аннотация: During two sampling seasons we analyzed on weekly basis fatty acid (FA) composition of seston fraction <130?m and zooplankton fraction >130?m, and compared them using a multivariate canonical correlation analysis (CCA). Besides, we evaluated a possible impact of water temperature and inorganic nutrients on FA composition of the seston and the zooplankton.In spite of significant differences in percentages of several individual FAs, we found very strong canonical correlation (cross-correlation, 1-week lag) between FA composition of the seston and the zooplankton. The most important factor, providing the overall canonical cross-correlation between FA profiles of the seston and the zooplankton fractions was eicosapentaenoic acid (20:5?3, EPA). FA composition of the zooplankton fraction had comparatively poor correlations with taxonomic composition of the zooplankton. Thus, seasonal variations of FA composition of the zooplankton were determined primarily by seasonal changes in FA composition of the seston, rather than by taxonomic differences of FA profiles between rotifers, cyclopoids and cladocerans. FA composition of the seston was strongly affected by its taxonomic composition, namely by that of phytoplankton. According to CCA, the highest factor loadings pertained to diatoms interacting with their marker acids, including EPA, and cyanobacteria and greens, interacting with their marker acids. Ciliates and small rotifers composed considerable and sometimes major part of the seston biomass, but according to CCA their contributions to seasonal variations of the total FA profile of the seston were insignificant. This finding indirectly support the conclusion of the other authors, that the main source of FAs presented in ciliates and rotifers must be sought in algae and that they do not modify FA composition of food consumed, apart from repackaging it.Water temperature was the principal environmental parameter which drove the overall variations of FA composition. Factor loadings for the inorganic nutrients were comparatively negligible. The main contribution in the seasonal variation of FA composition of the seston was given by negative interaction between water temperature and percentage of EPA in the seston. В© 2009 Elsevier GmbH.

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

Доп.точки доступа:
Gladyshev, M.I.; Sushchik, N.N.; Makhutova, O.N.; Dubovskaya, O.P.; Kravchuk, E.S.; Kalachova, G.S.; Khromechek, E.B.

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11.

Fatty acid analyses reveal high degrees of omnivory and dietary plasticity in pond-dwelling tadpoles / M. R. Whiles [et al.] // Freshwater Biology. - 2010. - Vol. 55, Is. 7. - P1533-1547, DOI 10.1111/j.1365-2427.2009.02364.x . - ISSN 0046-5070
Кл.слова (ненормированные):
Anura -- Diet -- Food web -- Foraging -- Gut contents -- Omnivory -- Selective feeding -- Amphibia -- Anura -- Bacteria (microorganisms) -- Hexapoda -- Lithobates -- Pseudacris crucifer
Аннотация: 1. Understanding the trophic relationships of consumers is central to ecology, but constructing meaningful food webs is often difficult because of a lack of detailed information on consumption versus assimilation and high degrees of omnivory.2. We used fatty acid analyses to examine the trophic relationships of three common larval anurans (Pseudacris crucifer, Lithobates catesbeianus and Lithobates clamitans) that are often classified as grazers or detritivores. Tadpoles and potential food sources were sampled in four ponds in southern Illinois and analysed for fatty acid composition. Single linkage cluster analysis was then used to compare fatty acid profiles among tadpole gut contents, tadpole muscle tissues and available food resources.3. Diets varied among species and within species among ponds, but organic sediments consistently contributed most to the fatty acid composition of the gut contents of all species. Fatty acid profiles also indicated that larval insects and phytoplankton were consumed by both L. catesbeianus and L. clamitans in one pond, while L. clamitans and P. crucifer consumed mainly periphyton along with sediments in another pond, and these diet differences appeared linked to physical differences among ponds, with periphyton and/or phytoplankton contributing more to tadpole diets in less shaded ponds.4. The fatty acid composition of muscle tissues of L. clamitans, the dominant tadpole in these systems, indicated that plant detritus and bacteria, which were the dominant components of organic sediments in the ponds, were common components of the assimilatory diet.5. Results demonstrate the utility of fatty acid analyses for assessing both consumption and assimilation. The tadpole assemblages we examined derive much of their energy from heterotrophic and allochthonous sources and exhibit high dietary plasticity. This information will allow for more accurate and comprehensive assessments of trophic interactions in freshwater habitats, as well as aid in amphibian conservation, management and captive propagation efforts. В© 2009 Blackwell Publishing Ltd.

Scopus
Держатели документа:
Department of Zoology, Center for Ecology, Illinois Fisheries and Aquaculture Center, Southern Illinois University, Carbondale, IL, United States
Institute of Biophysics of Siberian Branch of the Russian Academy of Science, Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny av. 79, Krasnoyarsk, Russian Federation
Department of Biology, Clarion University of Pennsylvania, Clarion, PA, United States : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Whiles, M.R.; Gladyshev, M.I.; Sushchik, N.N.; Makhutova, O.N.; Kalachova, G.S.; Peterson, S.D.; Regester, K.J.

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12.

Seasonal transfer of the pool of the essential eicosapentaenoic acid along the pelagic trophic chain of a eutrophic reservoir / N. N. Sushchik [et al.] // Doklady Biological Sciences. - 2008. - Vol. 422, Is. 1. - P355-356, DOI 10.1134/S0012496608050232 . - ISSN 0012-4966
Кл.слова (ненормированные):
fresh water -- icosapentaenoic acid -- article -- biomass -- metabolism -- microbiology -- phytoplankton -- population density -- river -- Russian Federation -- season -- Biomass -- Eicosapentaenoic Acid -- Fresh Water -- Phytoplankton -- Population Density -- Rivers -- Russia -- Seasons -- Water Microbiology

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Kransnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660062, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Sushchik, N.N.; Gladyshev, M.I.; Makhutova, O.N.; Kravchuk, E.S.; Dubovskaya, O.P.; Kalacheva, G.S.

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13.

Agent-based modeling of the complex life cycle of a cyanobacterium (Anabaena) in a shallow reservoir / F. L. Hellweger [et al.] // Limnology and Oceanography. - 2008. - Vol. 53, Is. 4. - P1227-1241 . - ISSN 0024-3590
Кл.слова (ненормированные):
algal bloom -- annual variation -- cyanobacterium -- ecological modeling -- Eulerian analysis -- experimental study -- Lagrangian analysis -- life cycle -- nutrient availability -- phytoplankton -- population dynamics -- reservoir -- shallow water -- survival -- water column -- Bugach Reservoir -- Eurasia -- Krasnoyarsk [Russian Federation] -- Russian Federation -- Anabaena -- Anabaena flos-aquae
Аннотация: The cyanobacterium Anabaena flos-aquae and many other phytoplankton species have a complex life cycle that includes a resting stage (akinete). We present a new agent-based (also known as individual-based) model of Anabaena that includes the formation and behavior of akinetes. The model is part of a coupled Eulerian-Lagrangian model and can reproduce the main features of the observed seasonal and interannual population dynamics in Bugach Reservoir (Siberia), including an unexpectedly large bloom in a year with low nutrient concentrations. Model analysis shows that the internal loading of phosphorus (P) due to germination from the sediment bed is ?10% of the total input. However, most of the long-term nutrient uptake for Anabaena occurs in the sediment bed, which suggests that the sediment bed is not just a convenient overwintering location but may also be the primary source of nutrients. An in silico tracing experiment showed that most water column cells (?90%) originated from cells located in the sediment bed during the preceding winter. An in silico gene knockout experiment (akinete formation is prohibited) showed that the formation of resting stages is of critical importance to the survival of the population on an annual basis. A nutrient-reduction management scenario indicates that Anabaena densities increase because they are less sensitive to water column nutrient levels (because of the sediment bed source) than other species. В© 2008, by the American Society of Limnology and Oceanography, Inc.

Scopus
Держатели документа:
Civil and Environmental Engineering Department, Northeastern University, Boston, MA 02115, United States
Center for Urban Environmental Studies, Northeastern University, Boston, MA 02115, United States
Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Hellweger, F.L.; Kravchuk, E.S.; Novotny, V.; Gladyshev, M.I.

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14.

Dependence of the domination of Anabaena flos-aquae (Lyngb.) Breb. in the phytoplankton community on the initial abundance of akinetes / E. S. Kravchuk, M. I. Gladyshev, E. A. Ivanova // Doklady Biological Sciences. - 2007. - Vol. 416, Is. 1-6. - P377-378, DOI 10.1134/S0012496607050158 . - ISSN 0012-4966
Кл.слова (ненормированные):
Anabaena flos-aquae -- Anabaena -- animal -- article -- biological model -- biomass -- Cyanobacterium -- metabolism -- microbiology -- physiology -- phytoplankton -- Russian Federation -- season -- sediment -- Anabaena -- Animals -- Biomass -- Cyanobacteria -- Geologic Sediments -- Models, Biological -- Phytoplankton -- Russia -- Seasons -- Water Microbiology

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

Доп.точки доступа:
Kravchuk, E.S.; Gladyshev, M.I.; Ivanova, E.A.

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15.

Seasonal correlations of elemental and ?3 PUFA composition of seston and dominant phytoplankton species in a eutrophic Siberian Reservoir / M. I. Gladyshev [et al.] // Aquatic Ecology. - 2007. - Vol. 41, Is. 1. - P9-23, DOI 10.1007/s10452-006-9040-8 . - ISSN 1386-2588
Кл.слова (ненормированные):
Elemental stoichiometry -- Phytoplankton -- Polyunsaturated fatty acids -- Seston -- carbon -- dominance -- eutrophic environment -- fatty acid -- nitrogen -- nutritional requirement -- nutritive value -- phosphorus -- phytoplankton -- seasonal variation -- seston -- zooplankton -- Eurasia -- Siberia -- Anabaena -- Bacillariophyta -- Cyanobacteria -- Gomphosphaeria -- Peridinium -- Planktothrix -- Stephanodiscus
Аннотация: The elemental and fatty acid composition of seston was studied for 3 years, from May to October, in a small Reservoir. Under comparatively low C:P ratio, multivariate canonical analysis revealed no straightforward simple correlations between phosphorus and single ?3 PUFA species, but complex significant interaction between elemental composition (stoichiometry) of seston and total sestonic ?3 PUFA as a whole. Since sestonic C, P and N were found to originate mostly from phytoplankton, the contents of particulate elements and PUFA were attributed to single species in periods of their pronounced dominance. Phytoplankton species of genera of Stephanodiscus, Peridinium, Gomphosphaeria, Planktothrix and Anabaena in periods of their pronounced dominance had relatively constant species-specific elemental and PUFA composition. Phytoplankton species significantly differed in their elemental and PUFA composition, as well as in ratios of C:N, N:P, PUFA:P and partly C:P that indicate food quality for zooplankton. Hence, there were no phytoplankton species of clearly high or low nutritional value. All of phytoplankters, or at least detritus, that originated from them, may meet specific elemental and biochemical requirements of specific groups of zooplankton. Dividing phytoplankton on basis of their elemental and biochemical composition, i.e., nutrition quality, into large taxa (cyanobacteria, diatoms, etc.) appeared to be too coarse for assessing nutritional value for zooplankton. В© Springer Science+Business Media B.V. 2006.

Scopus
Держатели документа:
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Krasnoyarsk State University, Svobodny av. 79, Krasnoyarsk 660041, Russian Federation
Krasnoyarsk State Agricultural University, Mira av., 88, Krasnoyarsk 660049, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Gladyshev, M.I.; Sushchik, N.N.; Kolmakova, A.A.; Kalachova, G.S.; Kravchuk, E.S.; Ivanova, E.A.; Makhutova, O.N.

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16.

Seasonal changes in the standing stock of essential polyunsaturated fatty acids in the biomass of phyto- and zoobenthos on a littoral station of the Yenisei River / M. I. Gladyshev [et al.] // Doklady Biological Sciences. - 2005. - Vol. 403, Is. 1-6. - P267-268, DOI 10.1007/s10630-005-0107-9 . - ISSN 0012-4966
Кл.слова (ненормированные):
essential fatty acid -- animal -- article -- lipid metabolism -- metabolism -- physiology -- phytoplankton -- river -- Russian Federation -- season -- zooplankton -- Animals -- Fatty Acids, Essential -- Lipid Metabolism -- Phytoplankton -- Rivers -- Seasons -- Siberia -- Zooplankton

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660062, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Gladyshev, M.I.; Sushchik, N.N.; Kravchuk, E.S.; Ivanova, E.A.; Ageev, A.V.; Kalacheva, G.S.

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17.

Research of the meteorological factors influence on the fluorescence measurements of subsurface phytoplankton in blooming reservoir / O. V. Anishchenko, V. I. Komakov, M. I. Gladyshev // Doklady Akademii Nauk. - 2004. - Vol. 397, Is. 1. - С. 124-127 . - ISSN 0869-5652
Кл.слова (ненормированные):
Bacteria -- Fluorescence -- Meteorological problems -- Precipitation (meteorology) -- Reservoirs (water) -- Solar radiation -- Wind effects -- Meteorological effects -- Algae
Аннотация: The reaction of algae and cyano-bacteria photosynthetic apparatus on atmospheric sediments, incident solar radiation and wind velocity was estimated by measuring chlorophyll fluorescence using three-beam fluorescent diagnostics. As shown, wind in the spring positively affects the chlorophyll concentration but causes negative effect on phytoplankton photosynthetic activity in other seasons. Under conditions of high-intensity solar irradiation confervoid and colonial cyanobacteria, possessing gas vacuoles, have an advantage over plankton eukaryotic algae. Other response differences weren't observed.

Scopus
Держатели документа:
Inst. Biofiziki SO RAN, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Anishchenko, O.V.; Komakov, V.I.; Gladyshev, M.I.

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18.

Associating particulate essential fatty acids of the ?3 family with phytoplankton species composition in a Siberian reservoir / N. N. Sushchik [et al.] // Freshwater Biology. - 2004. - Vol. 49, Is. 9. - P1206-1219, DOI 10.1111/j.1365-2427.2004.01263.x . - ISSN 0046-5070
Кл.слова (ненормированные):
Cyanobacteria -- Diatoms -- Fatty acids -- Food quality -- Species composition -- cyanobacterium -- diatom -- fatty acid -- food quality -- food web -- growing season -- phytoplankton -- reservoir -- Eurasia -- Siberia -- Anabaena -- Anabaena flos-aquae -- Aphanizomenon -- Aphanizomenon flos-aquae -- Bacillariophyta -- Cyanobacteria -- Cyclotella -- Dinophyceae -- Flos -- Microcystis -- Microcystis aeruginosa -- Planktothrix -- Planktothrix agardhii -- Stephanodiscus
Аннотация: 1. We studied variation in the composition of fatty acids in the seston of a small freshwater reservoir with changes in phytoplankton composition during four growth seasons. We focused on the dynamics of the ?3 fatty acids because of their potential importance for zooplankton nutrition. 2. Total diatoms were related to the 20:5?3 fatty acid (eicosapentaenoic, EPA) content in seston. Among two dominant diatom genera, Cyclotella was not associated with EPA content. In contrast, there was a significant correlation between Stephanodiscus and the percentage contribution and content of EPA throughout the study. Hence, freshwater diatoms can differ strongly in content of the essential EPA. 3. We considered abundant cyanobacteria as a potential source of 18:3?3 fatty acid (linolenic, ALA) to aquatic food webs. Among four dominant cyanobacteria species, two (Anabaena flos-aquae and Planktothrix agardhii) showed significant correlation with the ALA content of the seston, while the other two (Aphanizomenon flos-aquae and Microcystis aeruginosa) did not. 4. Dinophyta had a relatively high level of 22:6?3 (docosahexaenoic, DHA) for freshwater species and can be also a source of EPA to aquatic food webs. 5. Our results show that various species of diatoms as well as cyanobacteria can be of contrasting nutritional value for zooplankton because of their different content of the essential PUFAs. Diatoms, which are low in EPA, could not be considered as a valuable food, while some field populations of cyanobacteria might be valuable sources of essential ALA.

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

Доп.точки доступа:
Sushchik, N.N.; Gladyshev, M.I.; Makhutova, O.N.; Kalachova, G.S.; Kravchuk, E.S.; Ivanova, E.A.

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19.

Seasonal dynamics of amino acids in two small Siberian reservoirs dominated by prokaryotic and eukaryotic phytoplankton / G. S. Kalachova [et al.] // Aquatic Ecology. - 2004. - Vol. 38, Is. 1. - P3-15, DOI 10.1023/B:AECO.0000021044.55658.71 . - ISSN 1386-2588
Кл.слова (ненормированные):
Amino acids -- Blooms -- Cyanobacteria -- Phytoplankton -- amino acid -- biomass -- phytoplankton -- reservoir -- seasonal variation -- Eurasia -- Siberia -- Cyanobacteria -- Eukaryota -- Prokaryota
Аннотация: The comparison of the dynamics of phytoplankton biomass and total amino acid composition was made for two water bodies: in one the phytoplankton were dominated by prokaryotes (i.e., there was a bloom of cyanobacteria) and by eukaryotic microalgae in the other. The dynamics of phytoplankton biomass and of total amino acid composition of water were investigated during the vegetation season. It was found that the only factor that significantly changed the percentages of amino acids in water was the bloom of cyanobacteria in the "blooming" water body. During the bloom of cyanobacteria, the absolute and relative content of the Leu-Glu group increased, while the contents of other acids generally dropped. Before and after the bloom, no significant variations in the total amino acid composition were recorded. In the reservoir where eukaryotic microalgae dominated, no significant variations in amino acid composition were recorded during the season.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Svobodny av. 79, Krasnoyarsk, 660041, Russian Federation
Krasnoyarsk State Agric. University, Mira av., 88, Krasnoyarsk, 660049, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kalachova, G.S.; Kolmakova, A.A.; Gladyshev, M.I.; Kravchuk, E.S.; Ivanova, E.A.

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20.

Growth and potential photosynthesis of cyanobacteria are stimulated by viable gut passage in crucian carp / V. I. Kolmakov, M. I. Gladyshev // Aquatic Ecology. - 2003. - Vol. 37, Is. 3. - P237-242, DOI 10.1023/A:1025801326088 . - ISSN 1386-2588
Кл.слова (ненормированные):
Carassius auratus -- Cyanobacteria -- Gut passage -- cyanobacterium -- growth rate -- photosynthesis -- Russian Federation -- Anabaena -- Anabaena flos-aquae -- Aphanizomenon -- Aphanizomenon flos-aquae -- Carassius auratus -- Carassius carassius -- Cyanobacteria -- Cyprinus carpio -- Flos -- Microcystis -- Microcystis aeruginosa -- Planktothrix -- Planktothrix agardhii
Аннотация: Growth and potential photosynthetic activity of phytoplankton passed through intestine of crucian carp (Carassius auratus) from a small Siberian reservoir were compared with those of phytoplankton taken the directly from the reservoir. The dominant phytoplankton species in the reservoir, Microcystis aeruginosa, showed a significant increase of growth after the passage. Subdominant Planktothrix agardhii also showed an increase in growth rate, while subdominants Anabaena flos-aquae and Aphanizomenon flos-aquae were not stimulated by the gut passage.

Scopus
Держатели документа:
Krasnoyarsk State University, Svobodny av., 79, Krasnoyarsk, 660042, Russian Federation
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kolmakov, V.I.; Gladyshev, M.I.

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