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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sid'ko A.F., Vasil'yev V.A.
Заглавие : Spectral brightness of inland waters and its correlation with phytoplankton content and hydrooptical characteristics
Место публикации : Hydrobiological Journal. - 1988. - Vol. 24, Is. 5. - С. 64-71. - ISSN 00188166 (ISSN)
Ключевые слова (''Своб.индексиров.''): cyanobacteria--diatom--light attenuation--pyrrhophyte--spectral brightness--ussr, dnieper--ussr, krasnoyarsk reservoir--algae--bacillariophyta--chlorophyta--cyanobacteria--dinophyceae--uncultured cyanobacterium
Аннотация: Spectral brightness coefficients are correlated with indices of vertical attenuation of horizontal irradiance, water transparency, phytoplankton chlorophyll content, and phytoplankton distribution. Data were obtained from Krasnoyarsk Reservoir and the Dnieper reservoirs. When diatoms and pyrrhophytes predominate, the maximum spectral brightness is in the vicinity of 580 nm, but when blue-green algae predominate the maxima are in the vicinity of 550 and 720 nm. -from Authors
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Попова Л.Ю., Максимова Е.Е., Репета Т.В., Брильков А.В., Печуркин Н.С.
Заглавие : Экспрессия клонированных генов бактериальной люминесценции у микроорганизмов, выделенных из лабораторных микрокосмов : научное издание
Место публикации : Биотехнология. - 1994. - N 5. - С. 6-10. - ISSN 0234-2758
ГРНТИ : 62.37.99
Предметные рубрики: БИОЛЮМИНЕСЦЕНЦИЯ
ГЕНЫ
ЛЮМИНЕСЦЕНЦИИ
КЛОНИРОВАННЫЕ
ЭКСПРЕССИЯ ГЕНОВ
У МИКРООРГАНИЗМОВ
ИЗ МИКРОКОСМОВ
ЛАБОРАТОРНЫХ
ИЗУЧЕНИЕ
Аннотация: Изучали динамику развития люминесценции у исходного шт. E. coli Z 905, содержащего рекомбинантную плазмиду pPHL 7 (Ap{r}, Lux{+}), и некоторых типичных представителей бактериальной микрофлоры лаб. микрокосмов, захвативших клонированные гены биолюминесценции. Эти представители были определены как Arthrobacter spp., Micrococcus sp. и Cyanobacteria sp. Виды микроорганизмов, захвативших рекомбинантные ДНК, образуют колонии R- и S-типов. При этом колонии S-типа проявляли способность к более высокому уровню люминесценции по сравнению с колониями R-типа. Динамика развития люминесценции у ярких клонов Arthrobacter sp. не отличалась принципиально от динамики люминесценции шт. E. coli Z 905 (pPHL 7). У некоторых фенотипически темных колоний E. coli и некоторых природных микроорганизмов при культивировании в жидкой среде обнаружена слабая способность к люминесценции. Вариации экспрессии генов люминесценции могут быть связаны с различиями в метаболизме. Россия, Ин-т биофизики СО РАН, Красноярск, Академгородок, 660036. Библ. 30
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovskii A.Y., Zotina T.A.
Заглавие : Effect of salinity on the growth of the cyanobacterium Spirulina platensis in monoculture and mixed cultures
Место публикации : Microbiology: MAIK NAUKA/INTERPERIODICA, 1996. - Vol. 65, Is. 3. - С. 371-372. - 2. - ISSN 0026-2617
Примечания : Cited References: 5
Аннотация: The effect of NaCl concentrations on the growth of the cyanobacterium Spirulina platensis in monoculture and in mixed culture with the green halophilic alga Dunaliella salina was studied. The,growth rate of S. platensis in monoculture did not change within the salinity range from 1 to 20 g/l NaCl. With an increase in salinity, the growth rate declined, and, at 70 g/l NaCl, the cyanobacteria died. The response of S. platensis to changes in salinity in mixed culture with D. salina did not differ from that observed in monoculture. At a concentration of 50 g/l NaCl these species of microorganisms could coexist.
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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) : Gladyshev M.I., Kolmakov V.I., Kravchuk E.S., Ivanova E.A., Trusova M.Y., Gribovskaya I.V., Zhilenkov M.D.
Заглавие : Growth and survival of cyanobacteria in water from blooming and nonblooming ponds under experimental conditions.
Место публикации : Doklady Biological Sciences. - 2000. - Vol. 375. - С. 607-609. - ISSN 00124966 (ISSN)
Ключевые слова (''Своб.индексиров.''): chlorophyll--fresh water--phosphorus--anabaena--arctic--article--biomass--comparative study--cyanobacterium--growth, development and aging--microbiology--ph--plant--russian federation--season--anabaena--arctic regions--biomass--chlorophyll--cyanobacteria--fresh water--hydrogen-ion concentration--phosphorus--plants--russia--seasons
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kratasyuk V.A., Esimbekova E.N., Gladyshev M.I., Khromichek E.B., Kuznetsov A.M., Ivanova E.A.
Заглавие : The use of bioluminescent biotests for study of natural and laboratory aquatic ecosystems
Место публикации : Chemosphere. - 2001. - Vol. 42, Is. 8. - С. 909-915. - ISSN 00456535 (ISSN) , DOI 10.1016/S0045-6535(00)00177-6
Ключевые слова (''Своб.индексиров.''): alcohol dehydrogenase--bacterial luciferase--bioluminescence--blooming--pollution--trypsin--water toxicity--alcohol dehydrogenase--benzoquinone--luciferase--trypsin--aquatic ecosystem--bioluminescence--water quality--article--bacterium culture--bioluminescence--blue green alga--ecosystem--pond--seasonal variation--water pollution--water quality--benzoquinones--biological assay--cyanobacteria--ecosystem--environmental monitoring--eutrophication--fmn reductase--indicators and reagents--luminescent measurements--nadh, nadph oxidoreductases--water pollutants--russian federation--algae--bacteria (microorganisms)--chlorophyta--cyanobacteria--uncultured cyanobacterium
Аннотация: A set of bioluminescent tests was developed to monitor water quality in natural and laboratory ecosystems. It consisted of four bioluminescent systems: luminous bacteria, coupled enzyme system NADH:FMN-oxidoreductase-luciferase and triplet enzyme systems with alcohol dehydrogenase and trypsin. The set of biotests was applied for a small forest pond (Siberia, Russia), laboratory microecosystems polluted with benzoquinone and a batch culture of blue-green algae. Thereby effects of natural water compared to those of models of heavy pollution and "bloom" of blue-greens on the bioluminescent tests were revealed. The set of biotests was not affected by a natural seasonal variability of water quality in the unpolluted pond, but responded to the heavy pollution and the "bloom" of blue-greens. The set of biotests could be recommended as the alarm test to control the acute toxicity of natural water bodies. В© 2001 Elsevier Science Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Kalacheva G.S., Gladyshev M.I.
Заглавие : Secretion of free fatty acids by prokaryotic and eukaryotic algae at optimal, supraoptimal, and suboptimal growth temperatures
Место публикации : Mikrobiologiya. - 2001. - Vol. 70, Is. 5. - С. 629-635. - ISSN 00263656 (ISSN)
Ключевые слова (''Своб.индексиров.''): free fatty acids--microalgae--secretion--fatty acid--article--chemistry--chlorella--cyanobacterium--cytology--extracellular space--growth, development and aging--intracellular fluid--temperature--chlorella--cyanobacteria--english abstract--extracellular space--fatty acids, nonesterified--intracellular fluid--temperature
Аннотация: Abstract-The paper describes the composition of extracellular free fatty acids (FFAs) and intracellular fatty acids (FAs) in the enrichment cultures of the prokaryotic alga Spirulina platensis and the eukaryotic alga Chlorella vulgaris grown at optimal, supraoptimal, and suboptimal growth temperatures. With increasing growth temperature, the degree of unsaturation of the intracellular FAs of both algae decreased, while that of the extracellular FFAs of 5. platensis increased. The composition of the extracellular FFAs of C. vulgaris practically did not depend on the growth temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Trusova M.Yu., Gladyshev M.I.
Заглавие : Phylogenetic diversity of winter bacterioplankton of eutrophic Siberian reservoirs as revealed by 16S rRNA gene sequences
Место публикации : Microbial Ecology. - 2002. - Vol. 44, Is. 3. - С. 252-259. - ISSN 00953628 (ISSN) , DOI 10.1007/s00248-002-2020-1
Ключевые слова (''Своб.индексиров.''): bacterioplankton--community composition--community dynamics--genetic variation--phylogenetics--reservoir--winter--russian federation--actinobacteria--bacteria (microorganisms)--bacteroides--betaproteobacteria--cyanobacteria--cytophaga--flavobacterium--prokaryota--proteobacteria--bacterial dna--fresh water--rna 16s--animal--article--bacterium--chemistry--dna sequence--genetic variability--genetics--microbiology--molecular genetics--phylogeny--plankton--russian federation--season--animals--bacteria--dna, bacterial--fresh water--molecular sequence data--phylogeny--plankton--rna, ribosomal, 16s--seasons--sequence analysis, dna--siberia--variation (genetics)
Аннотация: Using 16S rRNA gene sequence analyses we investigated the bacterial diversity of winter bacterioplankton of two eutrophic Siberian reservoirs. These reservoirs show similarity in phytoplankton community composition in spring and autumn but tend to differ in summer in exhibiting cyanobacterial bloom. Forty-eight unique partial 16S RNA gene sequences retrieved from two libraries were mostly affiliated with the class Actinobacteria, ? subdivision of the class Proteobacteria, and the phylum Cytophaga-Flavobacterium-Bacteroides. The clone library of the pond exhibiting summer cyanobacterial bloom showed more diversity in sequence composition. A significant number of bacterial 16S rRNA gene clones were closely related to freshwater bacteria previously found in different aquatic ecosystems. This finding confirms the assumption that some bacterial clades are globally distributed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Kravchuk E.S., Kolmakov V.I., Ivanova E.A., Trusova M.Y., Sushchik N.N., Gribovskaya I.V.
Заглавие : Experimental study of postwintering germination of akinetes and dormant cells of cyanoprocaryotes from bottom sediments of blooming and nonblooming ponds.
Место публикации : Doklady Biological Sciences. - 2002. - Vol. 383, Is. 1-6. - С. 131-132. - ISSN 00124966 (ISSN)
Ключевые слова (''Своб.индексиров.''): fresh water--article--cyanobacterium--cytology--growth, development and aging--microbiology--physiology--season--cyanobacteria--fresh water--seasons--water microbiology
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10.

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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11.

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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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tolomeyev A.P.
Заглавие : Phytoplankton diet of Arctodiaptomus salinus (Copepoda, Calanoida) in Lake Shira (Khakasia)
Место публикации : Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - С. 229-234. - ISSN 13862588 (ISSN) , DOI 10.1023/A:1015618104520
Ключевые слова (''Своб.индексиров.''): arctodiaptomus salinus--food selectivity--phytoplankton--diet--food selection--phytoplankton--saline lake--zooplankton--russian federation--algae--animalia--arctodiaptomus--calanoida--copepoda--cyanobacteria--eukaryota--invertebrata--lyngbya--lyngbya contorta--microcystis--microcystis sp.
Аннотация: A flow-through method was employed to study the algal part of the diet spectrum of the calanoid Arctodiaptomus salinus in the surface layer of the lake and in the phytoplankton biomass maximum zone (10 m deep). Daily consumption rates of this calanoid differed markedly in these layers, being 1 and 11 ?g ind -1 d-1 respectively. The cyanobacterial taxa, Lyngbya contorta and Microcystis sp., accounted for more than a half of the ration. Nevertheless, the negative Ivlev electivity coefficient indicated that Arctodiaptomus prefers none of these two taxa. The low measured uptakes suggest that the energy expenditure is compensated by other resources, presumably microzooplankton and detritus.
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14.

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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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Gladyshev M.I., Kalachova G.S., Kravchuk E.S., Dubovskaya O.P., Ivanova E.A.
Заглавие : Particulate fatty acids in two small Siberian reservoirs dominated by different groups of phytoplankton
Место публикации : Freshwater Biology. - 2003. - Vol. 48, Is. 3. - С. 394-403. - ISSN 00465070 (ISSN) , DOI 10.1046/j.1365-2427.2003.01009.x
Ключевые слова (''Своб.индексиров.''): cyanobacteria--daphnids--diatoms--fatty acids--alga--cyanobacterium--fatty acid--periodicity--phytoplankton--reservoir--seston--algae--bacillariophyta--chlorophyta--cyanobacteria--daphnia--dinophyceae--euglenida--eukaryota
Аннотация: 1. We studied the composition of fatty acids (FAs) in the seston from two small freshwater reservoirs (Bugach and Lesnoi) with distinct periodicity of domination by cyanobacteria and eukaryotic algae during the growth season. 2. The diatoms in the both reservoirs were characterised by a high content of 14:0 and C16 unsaturated acids, whereas that of the essential FA 20:5?3 [eicosapentanoic acid (EPA)] was low. The correlation between this polyunsaturated FA (PUFA) and diatom biomass was not significant in either reservoir. The percentage of 20:5?3 in seston significantly correlated with the biomass of euglenophyta in Bugach and dinophyta in Lesnoi. Hence the diatoms, usually referred as a valuable food for zooplankton, were not an important source of the essential PUFA in these systems. 3. The dominant cyanobacteria in Bugach, and the green algae in Lesnoi, both contained the same marker acids: 18:3?3 and 18:2?6. Hence, a discrimination between these two phytoplanktonic groups on the basis of FA biomarkers may be difficult in some cases. 4. We found no significant correlation between the content of 20:5?3 in seston and the biomass of the dominant daphniids in either reservoir. This is contrary to expectations, based on the literature, that EPA is generally important. Rather, the biomass of the two dominant Daphnia species in Bugach correlated strongly with the content of 18:3?3 in the seston. The cyanobacteria were a probable source of this ?3 FA for Daphnia. We conclude that EPA is not always important for Daphnia populations although, in such cases, some other PUFA (e.g. 18:3?3) might be related to their growth.
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16.

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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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Gladyshev M.I., Kalachova G.S., Kravchuk E.S., Dubovskaya O.P., Ivanova E.A.
Заглавие : Particulate fatty acids in two small Siberian reservoirs dominated by different groups of phytoplankton
Колич.характеристики :10 с
Место публикации : Freshw. Biol.: BLACKWELL PUBLISHING LTD, 2003. - Vol. 48, Is. 3. - P394-403. - ISSN 0046-5070, DOI 10.1046/j.1365-2427.2003.01009.x
Примечания : Cited References: 44
Предметные рубрики: ENCLOSED EXPERIMENTAL ECOSYSTEM
BLUE-GREEN-ALGAE
DAPHNIA-GALEATA
FOOD QUALITY
MICROALGAE
ZOOPLANKTON
NUTRITION
GROWTH
LAKE
REPRODUCTION
Ключевые слова (''Своб.индексиров.''): cyanobacteria--daphnids--diatoms--fatty acids
Аннотация: 1. We studied the composition of fatty acids (FAs) in the seston from two small freshwater reservoirs (Bugach and Lesnoi) with distinct periodicity of domination by cyanobacteria and eukaryotic algae during the growth season. 2. The diatoms in the both reservoirs were characterised by a high content of 14:0 and C16 unsaturated acids, whereas that of the essential FA 20:5omega3 [eicosapentanoic acid (EPA)] was low. The correlation between this polyunsaturated FA (PUFA) and diatom biomass was not significant in either reservoir. The percentage of 20:5omega3 in seston significantly correlated with the biomass of euglenophyta in Bugach and dinophyta in Lesnoi. Hence the diatoms, usually referred as a valuable food for zooplankton, were not an important source of the essential PUFA in these systems. 3. The dominant cyanobacteria in Bugach, and the green algae in Lesnoi, both contained the same marker acids: 18:3omega3 and 18:2omega6. Hence, a discrimination between these two phytoplanktonic groups on the basis of FA biomarkers may be difficult in some cases. 4. We found no significant correlation between the content of 20:5omega3 in seston and the biomass of the dominant daphniids in either reservoir. This is contrary to expectations, based on the literature, that EPA is generally important. Rather, the biomass of the two dominant Daphnia species in Bugach correlated strongly with the content of 18:3omega3 in the seston. The cyanobacteria were a probable source of this omega3 FA for Daphnia . We conclude that EPA is not always important for Daphnia populations although, in such cases, some other PUFA (e.g. 18:3omega3) might be related to their growth.
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18.

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
Колич.характеристики :6 с
Место публикации : Aquat. Ecol.: KLUWER ACADEMIC PUBL, 2003. - Vol. 37, Is. 3. - P237-242. - ISSN 1386-2588, DOI 10.1023/A:1025801326088
Примечания : Cited References: 28
Предметные рубрики: FISH
LAKE
BIOMANIPULATION
FOOD
ROACH
RESTORATION
COMMUNITIES
ZOOPLANKTON
MECHANISMS
ALGAE
Ключевые слова (''Своб.индексиров.''): carassius auratus--cyanobacteria--gut passage
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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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makhutova O.N., Sushchik N.N., Kalacheva G.S.
Заглавие : The information value of fatty acid composition of triacylglycerols and polar lipids of seston in assaying the food spectrum of microzooplankton in the bugach reservoir.
Место публикации : Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections / translated from Russian. - 2004. - Vol. 395. - С. 143-145. - ISSN 00124966 (ISSN)
Ключевые слова (''Своб.индексиров.''): fatty acid--fresh water--lipid--triacylglycerol--article--bacterium--biomass--chemistry--cyanobacterium--diatom--ecosystem--metabolism--physiology--phytoplankton--russian federation--season--bacteria--biomass--cyanobacteria--diatoms--ecosystem--fatty acids--fresh water--lipids--phytoplankton--russia--seasons--triglycerides
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gaevskii N.A., Kolmakov V.I., Dubovskaya O.P., Klimova E.P.
Заглавие : Interrelations of epibiontic microalgae and crustacean zooplankton under conditions of a blooming eutrophic water body
Колич.характеристики :7 с
Место публикации : Russ. J. Ecol.: MAIK NAUKA/INTERPERIODICA, 2004. - Vol. 35, Is. 1. - P35-41. - ISSN 1067-4136, DOI 10.1023/B:RUSE.0000011107.72097.1c
Примечания : Cited References: 22
Предметные рубрики: ALGAL EPIBIONT
DAPHNIA
HOST
COMMUNITIES
Ключевые слова (''Своб.индексиров.''): epibiontic microalgae--cyclops vicinus--daphnia longispina--mutualism--algal bloom
Аннотация: The possibility of symbiotic, mutualistic (++) interrelations between epibiontic microalgae (Characidiopsis ellipsoidea, Colacium vesiculosum) and cyclopoids (Cyclops vicinus, Mesocyclops leukarti) in the Bugach recreational reservoir with a bloom of cyanobacteria is demonstrated. Overgrown cyclopoids, compared to those free from microalgae, have advantages in oxygen supply, which may be insufficient in the period of intensive algal bloom. Calculations have shown that oxygen requirements of cyclopoids may be fully satisfied due to C. vesiculosum photosynthetic activity in the dysphotic zone if the density of overgrowth exceeds 1000 algal cells per individual. There is no significant correlation between the natural mortality of crustaceans and the indices of their overgrowth by microalgae.
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