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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
Колич.характеристики :6 с
Место публикации : Microbiology: MAIK NAUKA/INTERPERIODICA, 2001. - Vol. 70, Is. 5. - P542-547. - ISSN 0026-2617, DOI 10.1023/A:1012351920589
Примечания : Cited References: 19
Предметные рубрики: SURFACE-FILM
WATER
Ключевые слова (''Своб.индексиров.''): free fatty acids--secretion--microalgae
Аннотация: 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 S. 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 сборника (однотомник)
Шифр издания :
Автор(ы) : Sarangova A.B., Somova L.A., Pisman T.I.
Заглавие : Catalase activity as a potential indicator of the reducer component of small closed ecosystems
Колич.характеристики :4 с
Место публикации : LIFE SCIENCES: LIFE SUPPORT SYSTEMS STUDIES-I. Ser. ADVANCES IN SPACE RESEARCH: PERGAMON PRESS LTD, 1997. - Vol. 20: F4.6, F4.8, F4.2 and F4.9 Symposia of COSPAR Scientific Commission F on Life Sciences - Life Support System Studies-I, at the 31st COSPAR Scientific Assembly (JUL 14-SEP 21, 1996, BIRMINGHAM, ENGLAND), Is. 10. - P1945-1948. - ISBN 0273-1177, DOI 10.1016/S0273-1177(97)00630-3. - ISBN 0-08-043307-3
Примечания : Cited References: 8
Аннотация: Dynamics of catalase activity has been shown to reflect the growth curve of microorganisms in batch cultivation (celluloselythic bacteria Bacillus acidocaldarius and bacteria of the associated microflora Chlorella vulgaris). Gas and substrate closure of the three component ecosystems with spatially separated components "producer-consumer-reducer" (Chl, vulgaris-Paramecium caudatum-B. acidocaldarius, two bacterial strains isolated from the associated microflora Chl. vulgaris) demonstrated that the functioning of the reducer component can be estimated by the catalase activity of microorganisms of this component. (C) 1997 COSPAR. Published by Elsevier Science Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Tolomeev A.P., Temerova T.A., Degermendzhi A.G.
Заглавие : Dependence of growth rate of Moina macrocopa on concentration of Chlorella vulgaris in differential flowing and closed cultivators
Колич.характеристики :3 с
Место публикации : Dokl. Akad. Nauk: MEZHDUNARODNAYA KNIGA, 1997. - Vol. 352, Is. 2. - P281-283. - ISSN 0869-5652
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolmakov V.I., Levin L.A., Dubovskaya O.P., Gladyshev M.I.
Заглавие : A circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula
Колич.характеристики :4 с
Место публикации : Biofizika: MEZHDUNARODNAYA KNIGA, 2002. - Vol. 47, Is. 4. - P673-676. - ISSN 0006-3029
Примечания : Cited References: 12
Предметные рубрики: CLOSED CULTIVATORS
FLUORESCENCE
ZOOPLANKTON
Ключевые слова (''Своб.индексиров.''): daily rhythm of grazing--fluorescence--microalgae--flowing-through cultivator--photoperiod--statistical spectral analysis
Аннотация: The circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula under continuous illumination was studied by continuous registration of chlorophyll fluorescence at the outlet of a flow-through cultivator. A culture of green alga Chlorella vulgaris was used as a feed. The data obtained were treated by the statistical spectral analysis. It was found that animals preliminarily grown under a 12 h light : 12 h dark regime and transferred to constant light showed two maxima in the circadian rhythm of grazing with periods of 0.7 and 1.1 h. Animals preliminarily grown under constant light showed no circadian rhythm of grazing. It was concluded that the circadian rhythm of grazing of C quadrangula has endogenous nature and can change according to light conditions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pisman T.I., Pechurkin N.S., Somova L.A.
Заглавие : Competition between links in "producer-consumer" trophic chains in an aquatic closed system with spatially separated components
Колич.характеристики :5 с
Место публикации : SPACE LIFE SCIENCES: CLOSED ECOLOGICAL SYSTEMS: EARTH AND SPACE APPLICATIONS. Ser. ADVANCES IN SPACE RESEARCH: ELSEVIER SCIENCE BV, 2001. - Vol. 27: F4 4 Symposium of COSPAR Scientific Commission F held at the 33rd COSPAR Scientific Assembly (JUL, 2000, WARSAW, POLAND), Is. 9. - P1599-1603. - ISBN 0273-1177, DOI 10.1016/S0273-1177(01)00255-1
Примечания : Cited References: 13
Аннотация: The work analyzes functioning of a "producer-consumer" closed aquatic system with spatially separated links, where each component consisted of two species. Producers in the system were the microalgae of Chlorella vulgaris and Scenedesmus sp., consumers - Paramecium caudatum infusoria and Brachionus sp. rotifers. In the experiment the competing predators were consuming on a mixed culture of algae, and the competition of algae was studied under nitrogen limitation. Under these conditions competitiveness of Scenedesmus was higher than that of Chlorella vulgaris. Metabolism products of Scenedesmus algae have been found to have negative effect on reproduction of Paramecium caudatum protozoa. Predator population dynamics in the "consumer" link demonstrated that the rotifers that consume two algal species are more competitive compared to protozoa feeding on chlorella only. (C) 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Barkhatov Y.V., Khromechek E.B., Gubanov V.G.
Заглавие : Effects of the bacterial component on the viability of the Paramecium bursaria symbiotic complex (infusorian-zoochlorella)
Колич.характеристики :5 с
Место публикации : Russ. J. Ecol.: MAIK NAUKA/INTERPERIODICA, 2001. - Vol. 32, Is. 4. - P261-265. - ISSN 1067-4136, DOI 10.1023/A:1011314622045
Примечания : Cited References: 12
Ключевые слова (''Своб.индексиров.''): paramecium bursaria--endosymbiosis--matter exchange cycle
Аннотация: A hypothesis is considered that the establishment and maintenance of mass exchange processes in the Paramecium bursaria symbiotic complex (infusorian-alga) depends on the presence of the third component-bacteria-whose role is underestimated but essential for completing the exchange cycle. The role of this component in the symbiotic cycle of Paramecium bursaria is possible to reveal using special bactericidal preparations specifically inhibiting the bacteria involved in the metabolic cycle but having no effect on the functions of the host cell and the zoochlorella population. Experiments with various preparations of this type were performed, and the response to treatment was estimated from growth rates of the symbiotic complex and its components. This allowed identification of an antibiotic (rifampicin) that had no adverse influence on free-living zoochlorella and chlorella-free paramecia (the basic components of the symbiotic cycle) but drastically inhibited the growth of the P. bursaria symbiotic complex, which could be interpreted as evidence in favor of the hypothesis concerning the existence of the third symbiotic component.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : FURYAEV E.A., BELYANIN V.N., TERSKOV I.A.
Заглавие : CHANGES IN OPTICAL CHARACTERISTICS OF SOLITARY CHLORELLA CELLS DURING THE DEVELOPMENT CYCLE
Место публикации : SOVIET PLANT PHYSIOLOGY: PLENUM PUBL CORP, 1982. - Vol. 29, Is. 4. - С. 559-566. - 8. - ISSN 0038-5719
Примечания : Cited References: 19
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kirensky L.V., Gitelson I.I., Terskov I.A., Kovrov B.G., Lisovsky G.M., Okladnikov Y.N.
Заглавие : Theoretical and experimental decisions in the creation of an artificial ecosystem for human life support in space.
Место публикации : Life sciences and space research. - 1971. - Vol. 9. - С. 75-80. - ISSN 00759422 (ISSN)
Ключевые слова (''Своб.индексиров.''): article--bacterium--biotechnology--chlorella--energy metabolism--human--instrumentation--man machine interaction--metabolism--microclimate--space flight--weightlessness--bacteria--biotechnology--chlorella--ecological systems, closed--energy metabolism--environment, controlled--humans--life support systems--man-machine systems--space flight--weightlessness
Аннотация: All of man's former space flights were not real ventures into space in the biological sense, as his life was supported with unregenerated earth supplies. The coming stage of space exploration requires man's long existence in the cosmos and on the other planets. This stage of man's activity outside the earth become possible only by creating small man-made ecosystems, permitting the support of his metabolism by the recycling of substances of the terrestrial biosphere. Creation of such systems is a new scientific and technical task. Man-made ecosystems are a new product of man's activity, which have no complete analogy, either in nature, or in technology. Stochastic mechanisms, which stabilize biogeocenosis, cannot be effective in small ecosystems. A technique of parametric control over biosynthesis made it possible to calculate, and put to practice, an ecosystem for man with a cyclic regeneration of the atmosphere, water and, partially, food. The specific bio-technological properties of small man-made ecosystems are being analysed. The possibility of their application for man's excursions into space and for the settlement of other planets is being considered.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Barkhatov Yu.V., Khromechek E.B., Gubanov V.G.
Заглавие : Effects of the bacterial component on the viability of the Paramecium bursaria symbiotic complex (Infusorian-Zoochlorella)
Место публикации : Russian Journal of Ecology. - 2001. - Vol. 32, Is. 4. - С. 261-265. - ISSN 10674136 (ISSN) , DOI 10.1023/A:1011314622045
Ключевые слова (''Своб.индексиров.''): endosymbiosis--matter exchange cycle--paramecium bursaria--bacterium--symbiosis--viability--algae--bacteria (microorganisms)--ciliophora--paramecium--paramecium bursaria--zoochlorella
Аннотация: A hypothesis is considered that the establishment and maintenance of mass exchange processes in the Paramecium bursaria symbiotic complex (infusorian-alga) depends on the presence of the third component-bacteria-whose role is underestimated but essential for completing the exchange cycle. The role of this component in the symbiotic cycle of Paramecium bursaria is possible to reveal using special bactericidal preparations specifically inhibiting the bacteria involved in the metabolic cycle but having no effect on the functions of the host cell and the zoochlorella population. Experiments with various preparations of this type were performed, and the response to treatment was estimated from growth rates of the symbiotic complex and its components. This allowed identification of an antibiotic (rifampicin) that had no adverse influence on free-living zoochlorella and chlorella-free paramecia (the basic components of the symbiotic cycle) but drastically inhibited the growth of the P. bursaria symbiotic complex, which could be interpreted as evidence in favor of the hypothesis concerning the existence of the third symbiotic component.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : FURYAEV E.A., BELYANIN V.N., TERSKOV I.A.
Заглавие : CHANGES IN OPTICAL CHARACTERISTICS OF SOLITARY CHLORELLA CELLS DURING THE DEVELOPMENT CYCLE
Колич.характеристики :8 с
Место публикации : SOVIET PLANT PHYSIOLOGY: PLENUM PUBL CORP, 1982. - Vol. 29, Is. 4. - P559-566. - ISSN 0038-5719
Примечания : Cited References: 19
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pisman T.I., Bogdanova O.N.
Заглавие : An experimental study and a mathematical model of interactions in a mixed culture of invertebrates and algae in the Producer-Consumer aquatic biotic cycle
Колич.характеристики :6 с
Место публикации : Biofizika: MEZHDUNARODNAYA KNIGA, 2004. - Vol. 49, Is. 6. - С. 1112-1117. - ISSN 0006-3029
Примечания : Cited References: 22
Предметные рубрики: PREY
Ключевые слова (''Своб.индексиров.''): mixed culture--invertebrates--algae--metabolic products
Аннотация: An experimental investigation was carried out, and a mathematical model of interaction between invertebrates (infusoria Paramecium caudatum and rotifera Brachionus plicatilis) and algae (Chlorella vulgaris and S enedesmus quadricauda) in the producer-consumer aquatic biotic cycle with spatially divided links was constructed. The model describes the dynamics of a mixed culture of infusoria and rotifera in the consumer link, when they consume a mixed culture of algae coming from the producer link. A negative influence of products of algae Scenedesmus metabolism upon the reproduction of infusoria P. caudatum was revealed. Taking this into account, a qualitative coincidence of the results of mathematical modeling with experimental data was obtained. It was shown that the co-existence of mixed algae culture in the producer link with invertebrates in the consumer link in the producer-consumer aquatic biotic cycle is impossible because of the displacement of infusoria P. caudatum by rotifera Brachionus plicatilis.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pisman T.I., Galayda Y.V., Loginova N.S.
Заглавие : Population dynamics of an algal-bacterial cenosis in closed ecological system
Колич.характеристики :5 с
Место публикации : SPACE LIFE SCIENCES: CLOSED ECOLOGICAL SYSTEMS: EARTH AND SPACE APPLICATIONS. Ser. ADVANCES IN SPACE RESEARCH: PERGAMON-ELSEVIER SCIENCE LTD, 2005. - Vol. 35: Workshop on Closed Ecological Systems (JUL, 2004, Paris, FRANCE), Is. 9. - С. 1579-1583. - ISBN 0273-1177, DOI 10.1016/j.asr.2005.03.073
Примечания : Cited References: 14
Ключевые слова (''Своб.индексиров.''): microalgae-bacteria relationships--photosynthates--detritus--chlorella--biotic cycle
Аннотация: The paper deals with microalgae-bacteria interrelationships in the "autotroph-heterotroph" aquatic biotic cycle. Explanations of why and how algal-bacterial ecosystems are formed still remain controversial. The paper presents results of experimental and theoretical investigations of the functioning of the algal-bacterial cenosis (the microalga Chlorella vulgaris and concomitant microflora). The Chlorella microbial community is dominated by representatives of the genus Pseudomonas. Experiments with non-sterile batch cultures of Chlorella on Tamiya medium showed that the biomass of microorganisms increases simultaneously with the increase in microalgal biomass. The microflora of Chlorella can grow on organic substances released by photosynthesizing Chlorella. Microorganisms can also use dying Chlorella cells, i.e. form a "producer-reducer" biocycle. To get a better insight into the cenosis-forming role of microalgae, a mathematical model of the "autotroph-heterotroph" aquatic biotic cycle has been constructed, taking into account the utilization of Chlorella photosynthates and dead cells by microorganisms and the contribution of the components to the nitrogen cycle. A theoretical study showed that the biomass of concomitant bacteria grown on glucose and detritus is larger than the biomass of bacteria utilizing only microalgal photosynthates, which agrees well with the experimental data. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gaysina L. A., Fazlutdinova, A., I, Mukhina N., Akhrnadeyeva L. E., Rogozin, D. Yu, Bul'khin A. O., Sulehanova, N., V, Johansen J. R.
Заглавие : Ecological features of cyanobacteria and algae communities of the littoral of the meromictic Lake Shira (Khakassia Republic, Russia)
Колич.характеристики :4 с
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-05-00428]; internal grant of M. Akmullah Bashkir State Pedagogical University; RFBRRussian Foundation for Basic Research (RFBR) [19-04-20031]
Место публикации : Theor. Appl. Ecol.: LLC PUBLISHING HOUSE, KAMERTON, 2020. - Is. 1. - С. 47-50. - ISSN 1995-4301, DOI 10.25750/1995-4301-2020-1-047-050. - ISSN 2618-8406(eISSN)
Примечания : Cited References:18. - The study was supported by Russian Foundation for Basic Research in the frame of project 19-05-00428 and an internal grant of M. Akmullah Bashkir State Pedagogical University for the year 2019. This article is published with financial support from the RFBR grant No. 19-04-20031.
Аннотация: During the study of cyanobacteria and algae from littoral of the meromictic Lake Shira (Republic of Khakassia, Russia) forty-eight taxa were identified: Cyanobacteria - 7, Chlorophyta - 5, and Bacillariophyta - 36 species. Cyanobacteria were represented by cosmopolitan taxa Leptolyngbya voronichiniana, cf. Trichocoleus hospitus and widely distributed in the freshwater ecosystems species Phormidium cf. paulsenianum, Pseudophormidium cf. golenkinianum, P. pauciramosum, Leptolyngbya perforans, and L. subtilissima. Among green algae typical freshwater taxa Chloroidium saccharophilum, Desmodesmus abundans, Oocystis lacustris, Chlorella sp., Stigeoclonium sp. were detected. Among Bacillariophyta the most frequent species were Amphora ovalis, Cymbella affinis, Encyonema silesiacum, Eunotia fallax, Gomphonella olivacea, G. parvulum, Kobayasiella subtilissima, Navicula minima, N. radiosa, N. veneta, Nitzchia fonticola, N. palea, Grunowia tabellaria, Surirella undulata. Several rare species cf. Fragilaria tenera, Grunowia tabellaria and cf. Ulnaria capitata were found. In relation to mineralization indifferents was the largest group (73%). In relation to pH, a unique feature of the investigated lake was the predominance of alkaliphilic species of diatoms (56%), such as Amphora ovalis, Cymbella affinis, Gomphonema truncatum, Hantzschia amphioxys, Navicula minima, N. veneta, Nitzschia cf. linearis, N. palea, Planothidium lanceolatum and other. In the geographic structure cosmopolitan group included 25 species (69%), boreal group - 4 species (11%), arcto-apline group - 2 species (6%). To obtain more accurate information on the biodiversity of cyanobacteria and algae of Lake Shira further studies using molecular-genetic and electron microscopic methods are needed.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M. I., Makhutova O. N., Kravchuk E. S., Anishchenko O. V., Sushchik N. N.
Заглавие : Stable isotope fractionation of fatty acids of Daphnia fed laboratory cultures of microalgae
Место публикации : Limnologica. - 2016. - Vol. 56. - С. 23-29. - ISSN 00759511 (ISSN) , DOI 10.1016/j.limno.2015.12.001
Ключевые слова (''Своб.индексиров.''): compound-specific isotope analysis--fatty acids--food webs--stable isotope fractionation--comparative study--crustacean--fatty acid--food web--isotopic analysis--isotopic fractionation--microalga--stable isotope--chlorella vulgaris--cryptomonas sp.--daphnia--daphnia galeata
Аннотация: We tested a comparatively new method of tracing of natural food webs, compound-specific isotope analysis (CSIA) of fatty acids (FA), using laboratory culture of Daphnia galeata fed Chlorella vulgaris and Cryptomonas sp. In general, Daphnia had significantly lighter carbon stable isotope composition of most fatty acids, including essential, than those of their food, microalgae. Thus, our results did not support the pivotal premise of the FA-CSIA application for food web analysis, i.e., transmitting the isotope 'signal' of essential FAs to consumers from their food without any modification. Moreover, the values of isotope fractionation of particular FAs in the consumer relative to its food were not constant, but varied from 1.35‰ to 7.04‰. The different isotope fractionation (depletion) values of diverse FAs in consumer were probably caused by different processes of their synthesis, catabolism and assimilation. More work is evidently to be done for correct interpretation of results of FA-CSIA during field studies for tracing of natural food webs. © 2015 Elsevier GmbH.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pisman T.I., Galayda Y.V., Shirobokova I.M.
Заглавие : Experimental and mathematical modeling of the consumer's influence on productivity of algae in a model aquatic ecosystem
Колич.характеристики :7 с
Место публикации : SPACE LIFE SCIENCES: CLOSED ECOLOGICAL SYSTEMS: EARTH AND SPACE APPLICATIONS. Ser. ADVANCES IN SPACE RESEARCH-SERIES: PERGAMON-ELSEVIER SCIENCE LTD, 2005. - Vol. 35: Workshop on Closed Ecological Systems (JUL, 2004, Paris, FRANCE), Is. 9. - P1521-1527. - ISBN 0273-1177, DOI 10.1016/j.asr.2004.12.048
Примечания : Cited References: 10
Ключевые слова (''Своб.индексиров.''): producer--consumer--nitrogen cycling--mathematical modeling
Аннотация: A "producer-consumer" (Chlorella vulgaris-Paramecium caudatum) closed aquatic system has been investigated experimentally and theoretically. It has been found that there is a direct relationship between the growth of the paramecia population and their release of ammonia nitrogen, which is the best form of nitrogen for Chlorella growth. The theoretical study of a model of a "producer-consumer" aquatic biotic cycle with spatially separated compartments has confirmed the contribution of paramecia to nitrogen cycling. It has been shown that an increase in the concentration of nitrogen released as metabolites of paramecia is accompanied by an increase in the productivity of microalgae. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prokopkin I., Makhutova O., Kravchuk E., Sushchik N., Anishchenko O., Gladyshev M.
Заглавие : Assessing the reliability of quantitative fatty acid signature analysis and compound-specific isotope analysis-based mixing models for trophic studies
Место публикации : Biomolecules: MDPI, 2021. - Vol. 11, Is. 11. - Ст.1590. - ISSN 2218273X (ISSN), DOI 10.3390/biom11111590
Аннотация: The study of the trophic relationships of aquatic animals requires correct estimates of their diets. We compared the quantitative fatty acid signature analysis (QFASA) and the isotope?mixing model IsoError, based on the compound?specific isotope analysis of fatty acids (CSIA?FA), which are potentially effective models for quantitative diet estimations. In a 21?day experiment, Daphnia was fed a mixture of two food items, Chlorella and Cryptomonas, which were supplied in nearly equal proportions. The percentages and isotope values of the FAs of the algal species and Daphnia were measured. The IsoError based on CSIA?FA gave an estimation of algae consumption using only one FA, 18:3n?3. According to this model, the proportion of consumption of Chlorella decreased while the proportion of consumption of Cryptomonas increased during the experiment. The QFASA model was used for two FA subsets—the extended?dietary subset, which included sixteen FAs, and the dietary one, which included nine FAs. According to both subsets, the portion of consumed Chlorella decreased from Day 5 to 10 and then increased at Day 21. The comparison of the two model approaches showed that the QFASA model is a more reliable method to determine the contribution of different food sources to the diet of zooplankton than the CSIA?based mixing model. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zadereev E. S., Drobotov A. V., Lopatina T. S., Ovchinnikov S. D., Tolomeev A. P.
Заглавие : Comparison of rapid methods used to determine the concentration, size structure and species composition of algae
Место публикации : J. Sib. Fed. Univ. - Biol.: Siberian Federal University, 2021. - Vol. 14, Is. 1. - С. 5-27. - ISSN 19971389 (ISSN), DOI 10.17516/1997-1389-0338
Аннотация: Traditionally, the abundance, cell size distribution and species identification of algae are determined by microscopic counts. In recent years, various rapid methods have been developed for routine algal studies. However, each of these methods has its drawbacks. It is important for aquatic ecologists to understand the advantages, disadvantages, and limitations of these methods. We compared the sensitivity of three rapid methods (multichannel fluorimeter FluoroProbe, imaging flow cytometer FlowCam, and CASY particle counter) to changes in cell abundance of three algae species (Chlorella vulgaris Beyerinck, Arthrospira platensis Gomont, and Nostoc sp.). We also assessed the ability of rapid methods to estimate the cell abundance of different species in the mixed samples. All instruments showed high sensitivity to changes in the cell abundance of different algae species and a mixture of these species. Any one of these methods, once calibrated, can be reliably used to estimate the abundance of a single-species/laboratory culture of microalgae. At the same time, FlowCam, without preliminary calibration, recorded the cell abundance closest to microscopic counts. When analysing a mixture of three microalgae differing in their cell sizes and spectral characteristics, FluoroProbe showed the highest accuracy in assessing the proportions of species in the mixture and FlowCam - in assessing their abundance. To study mixtures of algae and/or natural phytoplankton communities, it is advisable to use jointly a flow cytometer and a multichannel fluorimeter. The images of algae saved by the flow cytometer, if necessary, can be used to identify them, with a certain accuracy, to the species. Information on cells size and spectral characteristics obtained by two methods will be detailed enough to perform such common tasks as studying trophic interactions between phyto- and zooplankton or creating warning systems to inform of unwanted blooms of phytoplankton and their individual groups (for example, cyanobacteria). © Siberian Federal University. All rights reserved.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gaysina L. A., Fazlutdinova A. I., Mukhina O. N., Akhmadeyeva L. F., Rogozin D. Y.U., Bul'Khin A. O., Sukhanova N. V., Johansen J. R.
Заглавие : Ecological features of cyanobacteria and algae communities of the littoral of the meromictic Lake Shira (Khakassia Republic, Russia)
Место публикации : Theor. Appl. Ecol.: Publishing House "O- Kratkoe", 2020. - Vol. 2020, Is. 1. - С. 47-50. - ISSN 19954301 (ISSN), DOI 10.25750/1995-4301-2020-1-047-050
Аннотация: During the study of cyanobacteria and algae from littoral of the meromictic Lake Shira (Republic of Khakassia, Russia) forty-eight taxa were identified: Cyanobacteria - 7, Chlorophyta - 5, and Bacillariophyta - 36 species. Cyanobacteria were represented by cosmopolitan taxa Leptolyngbya voronichiniana, cf. Trichocoleus hospitus and widely distributed in the freshwater ecosystems species Phormidium cf. paulsenianum, Pseudophormidium cf. golenkinianum, P. pauciramosum, Leptolyngbya perforans, and L. subtilissima. Among green algae typical freshwater taxa Chloroidium saccharophilum, Desmodesmus abundans, Oocystis lacustris, Chlorella sp., Stigeoclonium sp. were detected. Among Bacillariophyta the most frequent species were Amphora ovalis, Cymbella affinis, Encyonema silesiacum, Eunotia fallax, Gomphonella olivacea, G. parvulum, Kobayasiella subtilissima, Navicula minima, N. radiosa, N. veneta, Nitzchia fonticola, N. palea, Grunowia tabellaria, Surirella undulata. Several rare species cf. Fragilaria tenera, Grunowia tabellaria and cf. Ulnaria capitata were found. In relation to mineralization indifferents was the largest group (73%). In relation to pH, a unique feature of the investigated lake was the predominance of alkaliphilic species of diatoms (56%), such as Amphora ovalis, Cymbella affinis, Gomphonema truncatum, Hantzschia amphioxys, Navicula minima, N. veneta, Nitzschia cf. linearis, N. palea, Planothidium lanceolatum and other. In the geographic structure cosmopolitan group included 25 species (69%), boreal group - 4 species (11%), arcto-apline group - 2 species (6%). To obtain more accurate information on the biodiversity of cyanobacteria and algae of Lake Shira further studies using molecular-genetic and electron microscopic methods are needed. © 2020 Publishing House "O- Kratkoe". All rights reserved.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pisman T.I.
Заглавие : Competition between populations in the consumer-producer trophic chain in a closed aquatic system
Колич.характеристики :4 с
Место публикации : Russ. J. Ecol.: MAIK NAUKA/INTERPERIODICA, 2003. - Vol. 34, Is. 4. - P267-270. - ISSN 1067-4136, DOI 10.1023/A:1024549916165
Примечания : Cited References: 17
Ключевые слова (''Своб.индексиров.''): producer--consumer--competition--ecosystem
Аннотация: The functioning of a closed aquatic consumer-producer system with spatially separated links, with each link consisting of two species, is considered. Competition between the consumers (infusorians Paratnechan caudatum and rotifers Brachionus sp.) feeding on a mixed algal culture (Chlorella vulgaris and Scenedesmus sp.) and competition between these algae under conditions of limited nitrogen supply are analyzed. It is shown that Scenedesmus algae have an advantage over C. vulgaris in terms of competitiveness, and their metabolic products have an adverse effect on reproduction in infusorians.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pisman T.I., Somova L.A.
Заглавие : Competition of the natural and manmade biotic cycles in the closed aquatic system
Колич.характеристики :5 с
Место публикации : SPACE LIFE SCIENCES: CLOSED ARTIFICIAL ECOSYSTEMS AND LIFE SUPPORT SYSTEMS. Ser. ADVANCES IN SPACE RESEARCH: PERGAMON-ELSEVIER SCIENCE LTD, 2003. - Vol. 31: Meeting of F4 1 Session of the 34th Scientific Assembly of COSPAR (OCT, 2002, HOUSTON, TEXAS), Is. 7. - P1757-1761. - ISBN 0273-1177, DOI 10.1016/S0273-1177(03)00117-0
Примечания : Cited References: 10
Аннотация: This study addresses competition between the Paramecium bursaria and zoochlorella - endosymbiosis and the infusoria Paramecium caudatum in a closed aquatic system. The system is a natural model of a simple biotic cycle. P. bursaria consumes glucose and oxygen released by its zoochlorella and releases nitrogenous compounds and carbon dioxide necessary for algal photosynthesis. P. caudatum was fed on bacteria. It was shown that the infusoria P. bursaria united in one cycle with Chlorella had a higher competitive ability than P. caudatum. With any initial percentage of the infusoria in the mixed culture, the end portion of P. bursaria reached 90 - 99%, which was significantly higher than the end portion of the P. caudatum population. It is assumed that the sustenance expenditures of P. caudatum were greater than those of the endosymbiotic paramecium, i.e. the closing of the components into a biotic cycle leads to a decrease in sustenance expenditures. (C) 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
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