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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsk A.Ya., Kosinenko S.V.
Заглавие : Intracellular phosphorus pool of the cyanobacterium spirulina platensis
Место публикации : Mikrobiologiya. - 2000. - Vol. 69, Is. 1. - С. 135-137. - ISSN 00263656 (ISSN)
Ключевые слова (''Своб.индексиров.''): phosphorus--article--biomass--cyanobacterium--growth, development and aging--metabolism--biomass--cyanobacteria--phosphorus
Аннотация: An intracellular phosphorus pool in a monoculture of the cyanobacterium Spirulina platensis was assessed using radioactive and nonradioactive phosphorus. The derived dependence of specific growth rate on the intracellular content of mineral phosphorus can be presented in the form of the Droop equation. It was found that the stage of replenishment of the intracellular phosphorus pool may affect the phosphorus turnover estimation in aquatic environments from the results of short-term measurements of phosphorus uptake.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rogozin D.Y., Trusova M.Y., Khromechek E.B., Degermendzhy A.G.
Заглавие : Microbial community of the chemocline of the meromictic Lake Shunet (Khakassia, Russia) during summer stratification
Место публикации : Microbiology. - 2010. - Vol. 79, Is. 2. - С. 253-261. - ISSN 00262617 (ISSN) , DOI 10.1134/S0026261710020189
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Degermendzhy A.G., Gulati R.D.
Заглавие : Understanding the mechanisms of blooming of phytoplankton in Lake Shira, a saline lake in Siberia (the Republic of Khakasia)
Место публикации : Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - С. 331-340. - ISSN 13862588 (ISSN)
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Degermendzhy A.G., Belolipetsky V.M., Zotina T.A., Gulati R.D.
Заглавие : Formation of the vertical heterogeneity in the Lake Shira ecosystem: The biological mechanisms and mathematical model
Место публикации : Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - С. 271-297. - ISSN 13862588 (ISSN) , DOI 10.1023/A:1015621508971
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Temerova T.A., Tolomeyev A.P., Degermendzhy A.G.
Заглавие : Growth of dominant zooplankton species feeding on plankton microflora in Lake Shira
Место публикации : Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - С. 235-243. - ISSN 13862588 (ISSN) , DOI 10.1023/A:1015607304508
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolmakova A.A., Gladyshev M.I., Kalachova G.S., Kravchuk E.S., Ivanova E.A., Sushchik N.N.
Заглавие : Amino acid composition of epilithic biofilm and benthic animals in a large Siberian river
Место публикации : Freshwater Biology. - 2013. - Vol. 58, Is. 10. - С. 2180-2195. - ISSN 00465070 (ISSN) , DOI 10.1111/fwb.12200
Ключевые слова (''Своб.индексиров.''): amino acids--epilithic microalgae and cyanobacteria--nutritive quality--river ecosystem--zoobenthos
Аннотация: We studied amino acid (AA) composition of epilithic biofilms and zoobenthos near the shore at a middle section of the Yenisei River (Siberia, Russia). We hypothesised that there was an imbalance between the composition and content of amino acids in the biofilm and its consumers, the zoobenthos, as well as between those in the zoobenthos and fish. Based on monthly sampling from 2007 to 2010, there was seasonal variation in AA profiles in the epilithic biofilms, probably caused by the succession of microalgal and cyanobacterial species. Overall, there was an imbalance in the percentage of the essential amino acids (lysine and histidine) between benthic animals and their food (the epilithic biofilm), which suggests that benthic animals may be limited by food quality. Moreover, the zoobenthos had a significantly higher content of AA, relative to carbon, than the biofilm. Based on sampling in 2012, there was an imbalance between the AA profiles of zoobenthos and that of their main consumer, the Siberian grayling (Thymallus arcticus), particularly in the percentages of two essential amino acids, lysine and leucine. In terms of overall content of essential amino acids, the nutritional value to fish of gammarids, which have recently invaded the river, was significantly lower than that of indigenous taxa, trichopteran and chironomid larvae. В© 2013 John Wiley & Sons Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kravchuk E.S., Ivanova E.A., Gladyshev M.I.
Заглавие : Spatial distribution of resting stages (akinetes) of the cyanobacteria Anabaena flos-aquae in sediments and its influence on pelagic populations
Место публикации : Marine and Freshwater Research. - 2011. - Vol. 62, Is. 5. - С. 450-461. - ISSN 13231650 (ISSN) , DOI 10.1071/MF10256
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Sushchik N.N., Makhutova O.N., Dubovskaya O.P., Kravchuk E.S., Kalachova G.S., Khromechek E.B.
Заглавие : Correlations between fatty acid composition of seston and zooplankton and effects of environmental parameters in a eutrophic Siberian reservoir
Место публикации : Limnologica. - 2010. - Vol. 40, Is. 4. - С. 343-357. - ISSN 00759511 (ISSN) , DOI 10.1016/j.limno.2009.12.004
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Gladyshev M.I., Ivanova E.A., Kravchuk E.S.
Заглавие : Seasonal distribution and fatty acid composition of littoral microalgae in the Yenisei River
Место публикации : Journal of Applied Phycology. - 2010. - Vol. 22, Is. 1. - С. 11-24. - ISSN 09218971 (ISSN) , DOI 10.1007/s10811-009-9418-9
Ключевые слова (''Своб.индексиров.''): fatty acids--riverine microalgae--taxa composition--temperature adaptations--algae--bacillariophyta--chlorophyta--cyanobacteria
Аннотация: We studied fatty acid (FA) composition of littoral microalgae in the fast-flowing oligotrophic river, the Yenisei, Siberia, monthly for 3 years. Seasonal dynamics of species composition had similar patterns in all the studied years. In springs, a pronounced dominance of filamentous green algae occurred, in summer and autumn diatoms were abundant, and in late autumn and winter epilithic biofilms consisted primarily of cyanobacteria and detritus. In general, FA composition of the algal periphytic community was dominated by 16:0, 16:1?7, 20:5?3, 14:0, and 18:3?3 throughout the studied period. Several groups of FAs, which had peculiar seasonal dynamics, were differentiated by statistical analysis based on a method of correlation graphs. The seasonal changes in FA composition could be partly explained by the seasonal succession of species composition of the community. Besides, we found that populations of both diatom and green algae grown in summer at a higher water temperature were lower in polyunsaturated fatty acids than those in spring, at a lower temperature. Hence, we suppose that the regular seasonal dynamics of FA composition of the studied littoral microalgae was driven both by changes in species composition and by temperature adaptations of the algal populations. The highest content of essential polyunsaturated FAs, eicosapentaenoic and docosahexaenoic acids, in the spring "psychrophilic" populations of diatoms could make them of the higher nutritive value for zoobenthic primary consumers. В© Springer Science+Business Media B.V. 2009.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Anishchenko O.V., Gladyshev M.I., Kravchuk E.S., Ivanova E.A., Gribovskaya I.V., Sushchik N.N.
Заглавие : Seasonal variations of metal concentrations in periphyton and taxonomic composition of the algal community at a Yenisei River littoral site
Место публикации : Central European Journal of Biology. - 2010. - Vol. 5, Is. 1. - С. 125-134. - ISSN 1895104X (ISSN) , DOI 10.2478/s11535-009-0060-y
Ключевые слова (''Своб.индексиров.''): heavy metals--periphyton--seasonal dynamics--algae--chlorophyta--cyanobacteria--ulothrix zonata
Аннотация: The concentrations of metals K, Na, Ca, Mg, Fe, Mn, Zn, Cu, Ni, Pb, Co and Cr, in the water and periphyton (epilithic algal communities) were studied at a site in the middle stream of the Yenisei River (Siberia, Russia) during three years using monthly sampling frequencies. Despite considerable seasonal variations in aquatic concentrations of some metals, there was no correlation between metal contents in the water and in periphyton. Seasonal concentration variations of some metals in periphyton were related to the species (taxonomic) composition of periphytic microalgae and cyanobacteria. Enhanced levels of Ni and Co in periphyton in late autumn, winter, and early spring were likely caused by the predominance of cyanobacteria in the periphytic community, and annual maximum levels of K in periphyton in late spring and early summer were attributed to the domination of Chlorophyta, primarily Ulothrix zonata. В© Versita Warsaw and Springer-Verlag Berlin Heidelberg.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kravchuk E.S., Gladyshev M.I., Ivanova E.A.
Заглавие : Dependence of the domination of Anabaena flos-aquae (Lyngb.) Breb. in the phytoplankton community on the initial abundance of akinetes
Место публикации : Doklady Biological Sciences. - 2007. - Vol. 416, Is. 1-6. - С. 377-378. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496607050158
Ключевые слова (''Своб.индексиров.''): 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
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Sushchik N.N., Kolmakova A.A., Kalachova G.S., Kravchuk E.S., Ivanova E.A., Makhutova O.N.
Заглавие : Seasonal correlations of elemental and ?3 PUFA composition of seston and dominant phytoplankton species in a eutrophic Siberian Reservoir
Место публикации : Aquatic Ecology. - 2007. - Vol. 41, Is. 1. - С. 9-23. - ISSN 13862588 (ISSN) , DOI 10.1007/s10452-006-9040-8
Ключевые слова (''Своб.индексиров.''): 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.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kravchuk E.S., Ivanova E.A., Gladyshev M.I.
Заглавие : Seasonal dynamics of akinetes of Anabaena flos-aquae in bottom sediments and water column of small Siberian reservoir
Место публикации : Aquatic Ecology. - 2006. - Vol. 40, Is. 3. - С. 325-336. - ISSN 13862588 (ISSN) , DOI 10.1007/s10452-006-9031-9
Ключевые слова (''Своб.индексиров.''): akinetes--cyanobacteria--cyanobacterial blooms--resting stages--abundance--alga--intertidal environment--open water--population dynamics--reservoir--sediment--water column--eurasia--siberia--anabaena--anabaena flos-aquae--cyanobacteria
Аннотация: Seasonal dynamics of Anabaena flos-aquae (Lyngb.) Breb., including vegetative cells, akinetes and akinete envelopes, in bottom sediments and water column at both littoral and deeper central stations of a small Siberian reservoir was studied. Two types of akinetes were observed: in the first half of summer Anabaena formed akinetes, which served for vegetative reproduction and germinated in water column soon after differentiation, while in the second half of summer the akinetes produced served as a resting stages, which were deposited to bottom sediments. Canonical correlation analyses revealed that decrease of water temperature was the main environmental factor that stimulated the akinete formation. In contrast to the general opinion, concentration of inorganic phosphorus slightly, but positively influenced the akinete formation. Thus, akinetes formed in response to the temperature decrease, needs a certain level of this nutrient. At littoral and open-water stations abundance and seasonal dynamics of akinetes in water column and their sinking pattern were very similar. However, seasonal dynamics of abundance of akinetes in sediments in these two reservoir locations differed: whereas the abundance of akinetes in open water increased permanently during the summer, that in the littoral decreased soon after their sedimentation. The cause for decrease in abundance of akinetes in bottom sediments in winter is unknown. В© Springer 2006.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolmakov V.I., Gladyshev M.I., Kravchuk E.S., Chuprov S.M., Anishchenko O.V., Ivanova E.A., Trusova M.Yu.
Заглавие : Species-specific stimulation of cyanobacteria by silver carp Hypophthalmichthys molitrix (Val.)
Место публикации : Doklady Biological Sciences. - 2006. - Vol. 408, Is. 1. - С. 223-225. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496606030069
Ключевые слова (''Своб.индексиров.''): animal--article--carp--cyanobacterium--growth, development and aging--microbiology--species difference--animals--carps--cyanobacteria--species specificity--cyanobacteria--cyprinus carpio--hypophthalmichthys molitrix--hypophthalmichthys nobilis
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prokopkin I.G., Gubanov V.G., Gladyshev M.I.
Заглавие : Modelling the effect of planktivorous fish removal in a reservoir on the biomass of cyanobacteria
Место публикации : Ecological Modelling. - 2006. - Vol. 190, Is. 3-4. - С. 419-431. - ISSN 03043800 (ISSN) , DOI 10.1016/j.ecolmodel.2005.05.011
Ключевые слова (''Своб.индексиров.''): biomanipulation--cyanobacteria--ecological mathematical model--viable gut passage--bacteria--biodiversity--biomass--ecosystems--rivers--cyanobacteria--fishes--viable gut passage--ecology--algal bloom--community dynamics--modeling--planktivore--removal experiment--reservoir--bugach reservoir--eastern hemisphere--eurasia--krasnoyarsk [russian federation]--russian federation--world--anabaena--carassius auratus--carassius carassius--cyanobacteria--cyprinus carpio--daphnia--microcystis
Аннотация: In 2002, a "top-down" biomanipulation (reduction of biomass of planktivorous fish Carassius auratus) had been successfully carried out in a small reservoir of the river Bugach (Krasnoyarsk, Russia), after which the cyanobacterial blooming ceased. However, the reservoir ecosystem was absolutely free of Daphnia - the main link of trophic cascade. As supposed, the reduction of blooming was the result of suppression of a direct stimulation effect of planktivorous fish on cyanobacteria, revealed earlier in laboratory experiments. The question arose as to whether the effect of stimulation of cyanobacteria revealed in laboratory may lead to the changes in biomass of cyanobacteria in the reservoir, observed after the biomanipulation. To test this supposition, a mathematical model describing growth of cyanobacteria in the reservoir was developed. The modelling results and field data on biomass of cyanobacteria in summer closely coincided. Modelling calculations showed that direct influence of planktivorous fish could cause the second summer peak of water blooming by Microcystis. On the contrary, removal of crucian carp from the reservoir will not affect the level of water blooming caused by cyanobacteria Anabaena, as this species' growth is not stimulated by fish. В© 2005 Elsevier B.V. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Anishchenko O.V., Komakov V.I., Gladyshev M.I.
Заглавие : Research of the meteorological factors influence on the fluorescence measurements of subsurface phytoplankton in blooming reservoir
Место публикации : Doklady Akademii Nauk. - 2004. - Vol. 397, Is. 1. - С. 124-127. - ISSN 08695652 (ISSN)
Ключевые слова (''Своб.индексиров.''): 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.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Gladyshev M.I., Makhutova O.N., Kalachova G.S., Kravchuk E.S., Ivanova E.A.
Заглавие : Associating particulate essential fatty acids of the ?3 family with phytoplankton species composition in a Siberian reservoir
Место публикации : Freshwater Biology. - 2004. - Vol. 49, Is. 9. - С. 1206-1219. - ISSN 00465070 (ISSN) , DOI 10.1111/j.1365-2427.2004.01263.x
Ключевые слова (''Своб.индексиров.''): 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.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kalachova G.S., Kolmakova A.A., Gladyshev M.I., Kravchuk E.S., Ivanova E.A.
Заглавие : Seasonal dynamics of amino acids in two small Siberian reservoirs dominated by prokaryotic and eukaryotic phytoplankton
Место публикации : Aquatic Ecology. - 2004. - Vol. 38, Is. 1. - С. 3-15. - ISSN 13862588 (ISSN) , DOI 10.1023/B:AECO.0000021044.55658.71
Ключевые слова (''Своб.индексиров.''): 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.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prokopkin I.G., Gubanov V.G., Gladyshev M.I.
Заглавие : Phenomenological mathematical model of biomanipulation influence (removal of planktivorous fish) on biomass of cyanobacteria in a small pond
Место публикации : Doklady Akademii Nauk. - 2003. - Vol. 392, Is. 6. - С. 847-849. - ISSN 08695652 (ISSN)
Ключевые слова (''Своб.индексиров.''): biomass--ecosystems--growth kinetics--mathematical models--carassius auratus--cyanobacteria--plankton--removal of fish--algae
Аннотация: Mathematical model is constructed for studying the effect of photosynthesis stimulation in cyanobacteria after their passing through crucian intestines on cyanobacteria biomass changes after bio-manipulations. At good agreement of model and natural data an explanation is found for observed differences in the influence of planktivorous fish on the two species of cyanobacteria. The calculations showed that one of the reasons for appearance of the peak of water blooming with a species Microcystic may be direct metabolic influence of planktivorous fish. Elimination of crucian from the pond will not affect the level of water blooming with Anabaena species.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolmakov V.I., Gladyshev M.I.
Заглавие : Growth and potential photosynthesis of cyanobacteria are stimulated by viable gut passage in crucian carp
Место публикации : Aquatic Ecology. - 2003. - Vol. 37, Is. 3. - С. 237-242. - ISSN 13862588 (ISSN) , DOI 10.1023/A:1025801326088
Ключевые слова (''Своб.индексиров.''): 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.
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