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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A.
Заглавие : Radionuclide speciation in sediments of the Yenisei River
Место публикации : Radioprotection. - 2011. - Vol. 46, Is. 6 SUPPL. - С. S195-S198. - ISSN 00338451 (ISSN) , DOI 10.1051/radiopro/20116457s
Аннотация: The examination of sediment samples collected from the Yenisei River revealed the presence of artificial radionuclides characteristic of radioactive discharges from the MCC facility: isotopes of europium (152Eu, 154Eu, and 155Eu), cesium (137Cs and 134Cs), 60Co,90Sr, and transuranium elements. Radionuclide concentrations in sediment layers remained high as far as 240 km downstream of the MCC. The vertical distribution of radionuclides in sediment cores was very complex, and down-core variations were due to different amounts of radionuclides released by the MCC and due to variations in the hydrologic conditions in the river. Sequential extraction performed on samples of the upper layers of the sediment core showed different degrees of potential environmental availability of artificial radionuclides: the amounts of extracted 90Sr, 152Eu and 241Am were the largest (60-80% of initial activity), then followed 60Co (30%), 238,239,240Pu (15-30%), and, last, 137Cs (5-15%). The distribution of 238U among chemical fractions of sediments was similar to that of 60Co and 238,239,240Pu: 30-40% of 238U initial activity was extracted. In a few samples, 241Am was present in the unextractable form, which may be accounted for by the presence of microparticles of the reactor fuel. В© 2011 EDP Sciences.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A., Bondareva L.
Заглавие : Actinides and other radionuclides in sediments and submerged plants of the Yenisei River
Место публикации : Journal of Alloys and Compounds. - 2007. - Vol. 444-445, Is. SPEC. ISS. - С. 495-499. - ISSN 09258388 (ISSN) , DOI 10.1016/j.jallcom.2007.01.146
Ключевые слова (''Своб.индексиров.''): accumulation--actinides in aquatic plants and sediments--radiochemical and ?-spectrometric investigations--sequential extraction technique--yenisei river--actinides--bioaccumulation--plants (botany)--radioisotopes--rivers--sampling--sediments--mining-and-chemical combine (mcc)--radiochemical and spectrometric investigations--sediment samples--sequential extraction techniques--contamination
Аннотация: The source of radioactive contamination of the Yenisei River floodplain, including contamination with actinides, is the Mining-and-Chemical combine (MCC), which has for many years been producing weapons-grade plutonium. Actinides have been detected not only in the soil and sediment of the river but also in the biomass of aquatic plants. The aim of our investigation was to assess the levels of actinides and other radionuclides in sediments and aquatic plants both near the MCC and at a considerable distance from it, down the Yenisei River. Investigations of the Yenisei River sediment samples revealed high activity concentrations of actinides (Pu isotopes and 241Am), which were 100 times higher than their global fallout levels. Sequential extraction of radionuclides from samples of sediments collected near the MCC showed that the amounts of extracted 241Am were the largest (up to 98% of initial activity). It was found that aquatic plants of the Yenisei River collected both near the MCC discharge site and at a distance up to 200 km downstream contained several actinide isotopes. The aquatic moss, Fontinalis antipyretica, was found to contain higher levels of radionuclides than Potamogeton lucens. Leaves of P. lucens contained higher levels of radionuclides, including 239Np, than stems. Sequential extraction of radionuclides from samples of aquatic plants showed that 239Np levels in exchangeable and adsorption fractions of P. lucens biomass were higher than in the respective fractions of F. antipyretica biomass. В© 2007 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A., Ermakov A., Sobolev A.
Заглавие : New data on transuranium elements in the ecosystem of the Yenisei river floodplain
Место публикации : Radiochimica Acta. - 2007. - Vol. 95, Is. 9. - С. 547-552. - ISSN 00338230 (ISSN) , DOI 10.1524/ract.2007.95.9.547
Ключевые слова (''Своб.индексиров.''): 243,244cm--blackcurrant--sediment and floodplain soil of the yenisei river--soil-plant transfer factor (tf)--transuranium elements
Аннотация: The aim of the study is to investigate levels of transuranium elements in the ecosystem of the Yenisei river floodplain in the vicinity of the Mining-and-Chemical Combine of Rosatom. For the first time, the transuranium isotopes 243,244Cm have been detected in sediment, floodplain soil, and a berry shrub (Ribes nigrum - the blackcurrant) in the flood-plain of the Yenisei river. The highest level of curium isotopes registered in the sediment of the Yenisei river is 21.4 Bq/kg (dry), which is more than twice higher than maximum curium levels reported for soils sampled not far from the Chernobyl Nuclear Plant. Blackcurrant plants growing on radioactively contaminated soils contain the same transuranium elements as the soil (plutonium isotopes, americium, and curium). The highest activity concentrations of all transuranic elements have been found in ashed roots of the blackcurrant plants: 239,240Pu - 9.3 Bq/kg, 241Am - 6.9 Bq/kg, and 243,244Cm - 1.8 Bq/kg. The highest soil-plant transfer factor (TF) for 243,244Cm is determined for roots - 0.073; the TF of 243,244Cm in berries is 0.027. The TF for 239,240Pu in berries is 0.006, which is several times lower than the TF for 243,244Cm. Analysis of our results and the literature data suggests that TFs for 243,244Cm are higher than those for 239,240Pu and 241Am. В© by Oldenbourg Wissenschaftsverlag.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A., Zotina T., Bondareva L.
Заглавие : Accumulation and release of 241Am by a macrophyte of the Yenisei River (Elodea canadensis)
Место публикации : Journal of Environmental Radioactivity. - 2005. - Vol. 81, Is. 1. - С. 33-46. - ISSN 0265931X (ISSN) , DOI 10.1016/j.jenvrad.2004.10.012
Ключевые слова (''Своб.индексиров.''): 241am--accumulation--laboratory experiments--release--submerged plant elodea canadensis--yenisei river--activation analysis--biomass--concentration (process)--effluents--plutonium--rivers--aquatic plants--elodea plant--macrophytes--radioactive contamination--transuranium elements--americium 241--river water--americium--americium nitrate--bioaccumulation--biological uptake--macrophyte--pollutant source--radioactive pollution--river water--submerged vegetation--article--biomass--concentration (parameters)--environmental factor--fractionation--laboratory--macrophyte--radioactivity--river--sampling--adsorption--chemistry--hydrocharitaceae--methodology--physiology--plant--radiation exposure--radiation monitoring--russian federation--sediment--soil pollutant--time--tissue distribution--water pollutant--eastern hemisphere--eurasia--russian federation--world--yenisei river--elodea canadensis--adsorption--americium--biomass--chemical fractionation--geologic sediments--hydrocharitaceae--plant shoots--radiation monitoring--rivers--russia--soil pollutants, radioactive--time factors--tissue distribution--water pollutants, radioactive
Аннотация: The source of radioactive contamination of the Yenisei River floodplain, including contamination with transuranic elements, is the Mining-and-Chemical Combine of the Russian Ministry of Atomic Energy, which has for many years been producing weapons-grade plutonium. Transuranic elements have been detected not only in the soil and sediment of the river but also in the biomass of aquatic plants. This work is an investigation of accumulation and release of 241Am by a submerged macrophyte of the Yenisei River (Elodea canadensis) in laboratory experiments. In 2000-2003, laboratory experiments were carried out with biomass of E. canadensis Mich. and filtered river water. The samples were collected from the Yenisei River upstream of the discharge of the Combine's radioactive effluent. The experiments showed that 241Am is accumulated by Elodea biomass: the activity concentration of 241Am can reach 3280 В± 240 Bq/g, with the concentration factor for 241Am 16 600 В± 2200 l/kg. Results of chemical fractionation have proved that in the course of 241Am accumulation by Elodea biomass, 241Am tightly bound to biomass increases from 11% to 27% of the total 241Am in the biomass. Release of 241Am from the decaying Elodea biomass has been evaluated experimentally. By the end of the experiment (lasting up to 127 days), the Elodea plants had lost up to 65% of their initial 241Am activity and the rate of 241Am release into the water environment reached 23 Bq/day. В© 2004 Elsevier Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A.
Заглавие : Artificial radionuclides in sediment of the Yenisei River
Место публикации : Chemistry and Ecology. - 2010. - Vol. 26, Is. 6. - С. 401-409. - ISSN 02757540 (ISSN) , DOI 10.1080/02757540.2010.504668
Ключевые слова (''Своб.индексиров.''): artificial radionuclides--river sediments--sequential extraction--yenisei river--cesium isotope--cobalt isotope--concentration (composition)--europium--extraction method--industrial waste--radionuclide--river pollution--sediment chemistry--krasnoyarsk [russian federation]--russian federation--yenisei river--zheleznogorsk
Аннотация: Releases from the nuclear facility Mining-and-Chemical Combine (MCC) located at Zheleznogorsk have contributed to the radionuclide contamination of the Yenisei River since operations commenced in 1958. The aim of this study was to assess the activity concentrations of artificial radionuclides and the strength of their binding in Yenisei River sediments. Investigation of Yenisei River sediment samples revealed the presence of artificial radionuclides typical of the MCC radioactive discharge: namely, isotopes of europium, caesium, 60Co and transuranium elements. The concentrations of artificial radionuclides in the sediment layers remain relatively high as far as 200 km downstream of the MCC. In sediment cores collected upstream of the MCC, ? -spectrometric measurements registered only one artificial radionuclide, 137Cs, with a maximal activity of 8 BqВ·kg -1. Sequential extraction performed on samples of the upper layers of the sediment core showed different degrees of potential environmental availability for artificial radionuclides: the highest was recorded for 241Am and 152Eu (up to 85% of initial activity), followed by 60Co (up to 32%), and finally, 137Cs (up to 15%). In a few samples, 241Am was present in the unextractable form, which may be accounted for by the presence of reactor fuel microparticles. В© 2010 Taylor & Francis.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Bolsunovsky A., Dementyev D.
Заглавие : Sediments of the Yenisei River: Monitoring of radionuclide levels and estimation of sedimentation rates
Место публикации : IAHS-AISH Publication. - 2010. - Vol. 337: Symposium on Sediment Dynamics for a Changing Future (14 June 2010 through 18 June 2010, Warsaw) Conference code: 84220. - С. 143-148
Ключевые слова (''Своб.индексиров.''): artificial and natural radionuclides--dating methods--river sediments--sedimentation rates--yenisei river--dating methods--natural radionuclides--river sediments--sedimentation rates--yenisei river--anoxic sediments--cesium--europium--lead--nuclear energy--nuclear weapons--plutonium--radioisotopes--river pollution--sedimentation--sedimentology--strontium--uranium--rivers--cesium isotope--cobalt isotope--europium--fluvial deposit--plutonium isotope--radioactive pollution--radioactive waste--radionuclide--sampling--sediment core--sediment pollution--sedimentation rate--krasnoyarsk [russian federation]--russian federation--yenisei river
Аннотация: The Yenisei River, one of the largest rivers in the world, is contaminated with artificial radionuclides released by a Russian nuclear facility producing weapon-grade plutonium, which has been in operation for many years. Examination of Yenisei River sediment samples revealed the presence of artificial radionuclides typical of radioactive discharge from the Mining-and-Chemical- Combine (MCC) nuclear facility: isotopes of europium ( 152Eu, 154Eu, and 155Eu), caesium ( 137Cs and 134Cs), 60Co, 90Sr, and transuranium elements. Maximum radionuclide concentrations in sediments remained high as far as 240 km downstream of the MCC. In sediment cores collected upstream of the MCC, ?-spectrometric measurements registered only one artificial radionuclide, 137Cs, with a maximum activity of approx. 8 Bq kg -1 dry mass. Sediments of the Yenisei River also contain natural radionuclides. Sedimentation rates in several sections of the Yenisei River were determined using, different approaches: the 210Pb dating method and the ratios of artificial radionuclides - 137Cs/ 60Co and 152Eu/ 154Eu. With increasing distance downstream of the city of Krasnoyarsk, sedimentation rates increased from 0.88 cm year -1 to 1.30-1.51 cm year -1. Copyright В© 2010 IAHS Press.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tret'Yakov G.A., Kalugin I.A., Dar'In A.V., Rogozin D.Yu., Degermendzhi A.G.
Заглавие : Physicochemical conditions of seasonal carbonate precipitation in Shira lake (Khakasia)
Место публикации : Doklady Earth Sciences. - 2012. - Vol. 446, Is. 1. - С. 1099-1101. - ISSN 1028334X (ISSN) , DOI 10.1134/S1028334X12090152
Ключевые слова (''Своб.индексиров.''): carbonate sediment--lacustrine deposit--physicochemical property--precipitation (chemistry)--khakassia--lake shira--russian federation
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rogozin D.Y., Zykov V.V., Kalugin I.A., Daryin A.V., Degermendzhy A.G.
Заглавие : Carotenoids of phototrophic organisms in bottom sediments of meromictic Lake Shira (Siberia, Russia) as an indicator of past stratification
Место публикации : Doklady Biological Sciences. - 2011. - Vol. 439, Is. 1. - С. 228-231. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496611040077
Ключевые слова (''Своб.индексиров.''): carotenoid--chlorophyll--water--animal--article--chemistry--ecosystem--lake--metabolism--microbiology--photosynthesis--phototrophy--pigmentation--russian federation--sediment--animals--carotenoids--chlorophyll--ecosystem--geologic sediments--lakes--photosynthesis--phototrophic processes--pigmentation--russia--siberia--water--water microbiology
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A.Y., Bondareva L.G.
Заглавие : Tritium in surface waters of the Yenisei River basin
Место публикации : Journal of Environmental Radioactivity. - 2003. - Vol. 66, Is. 3. - С. 285-294. - ISSN 0265931X (ISSN) , DOI 10.1016/S0265-931X(02)00132-7
Ключевые слова (''Своб.индексиров.''): deep-well injection of radionuclides--nuclear reactor--surface and ground waters--tritium--yenisei river basin--cooling water--nuclear reactors--sediments--surface waters--river basins--tritium--carbon 14--surface water--tritium--groundwater--nuclear power plant--radioactive pollution--surface water--tritium--article--catchment--measurement--radioactive contamination--river--sediment--environmental monitoring--geologic sediments--mining--power plants--reference values--russia--tritium--water pollutants, radioactive--russian federation--tritium
Аннотация: This paper reports an investigation of the tritium content in the surface waters of the Yenisei River basin near the Mining and Chemical Combine (MCC). In 2001 the maximum tritium concentration in the Yenisei River did not exceed 4 В± 1 Bq l-1, which is consistent with the data of 1998-99. However, it has been found that there are surface waters containing enhanced tritium as compared with the background values for the Yenisei River. For instance, in the Ploskii Stream and the Shumikha River the maximum tritium concentrations amount to 168 and 81 Bq l-1, respectively. The source of tritium in these surface waters is the last operating reactor at the MCC, which still uses the Yenisei water as coolant. In water and sediment samples of the Bolshaya Tel River (a tributary of the Yenisei River) the tritium content turned out to be at least 10 times higher than the background values for the Yenisei River. The measurements conducted at the RPA RADON (Moscow) revealed not only tritium but also the artificial radionuclide 14C in the Bolshaya Tel samples. The data obtained suggest that the Bolshaya Tel River receives the major part of tritium from sediments rather than from the water catchment area. This allows the conclusion that there is water exchange between the surface waters and the radioactively contaminated underground horizons of the "Severny" testing site. В© 2002 Elsevier Science Ltd. All rights reserved.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zotina T.A., Bolsunovskij A.Ya., Bondareva L.G.
Заглавие : New data on accumulation of americium-241 in photoassimilating organs of aquatic plant Elodea canadensis
Место публикации : Doklady Akademii Nauk. - 2005. - Vol. 405, Is. 2. - С. 274-276. - ISSN 08695652 (ISSN)
Ключевые слова (''Своб.индексиров.''): absorption--biomass--composition effects--microorganisms--plants (botany)--radioactivity--photoassimilation--radionuclide accumulation--americium
Аннотация: It is shown experimentally that 241Am activity accumulated by elodea is mainly contained in leaves (up to 80%) and about 20% - in the stem. Specific capacity of leaves in respect to americium is considerably dependent on the plant age that is due to formed on elodea leaf surface organo-mineral sediment consisting of mineral salts, epiphytic microorganisms and exometabolites. Am accumulation is larger in the older leaves (located lower on the stem) - nearly 70% of activity of americium accumulated by the whole plant biomass.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Kuchkina A.Y., Gladyshev M.I.
Заглавие : Fatty acid content and composition of sediments from Siberian eutrophic water bodies: Implications for biodiesel production
Место публикации : Water Research. - 2013. - Vol. 47, Is. 9. - С. 3192-3200. - ISSN 00431354 (ISSN) , DOI 10.1016/j.watres.2013.03.031
Ключевые слова (''Своб.индексиров.''): biodiesel--bottom sediments--fatty acids--fuel properties--inland water bodies--lipids--biological conditions--bottom sediments--environmental characteristic--freshwater reservoirs--fuel properties--inland waters--organic matter source--transformation process--biodiesel--eutrophication--fatty acids--feedstocks--fuels--lipids--reservoirs (water)--sedimentology--thermochemistry--sediments--biodiesel--fresh water--iodine--organic matter--biofuel--bottom water--combustion--eutrophic environment--eutrophication--fatty acid--lacustrine deposit--physicochemical property--reservoir--transformation--article--estuary--eutrophication--fatty acid analysis--lake--lipid composition--priority journal--sediment--khakassia--krasnoyarsk [krasnoyarsk (ads)]--krasnoyarsk [russian federation]--lake shira--russian federation
Аннотация: We studied lipids and fatty acids (FA) in bottom sediments from four Siberian water bodies, Bugach, Lesnoi and Krasnoyarsk freshwater reservoirs and brackish Shira lake, that differed in physico-chemical and biological conditions. We considered the potential of the bottom sediments as a feedstock for biodiesel production and estimated properties of the obtained biodiesel as a fuel on the basis of FA composition. Contents of lipids and FA in the sediments moderately varied and were generally close to the reported data from lacustrine and estuarine systems. We confirmed that long-term eutrophication of a water body resulted in the lipid-rich bottom sediments that make them a feedstock for biodiesel production. Each of the studied water bodies had specific FA composition of sediments likely due to different organic matter sources and transformation processes. Despite these differences in FA profiles, calculated key parameters (cetane number, iodine number and heat of combustion) of biodiesel produced from all the studied sediments met the limits established by current biodiesel standards. Thus, the variation in the sediment FA composition due to environmental characteristics of a water body likely has no principal significance for fuel properties of the obtained biodiesel. В© 2013 Elsevier Ltd.
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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hellweger F.L., Kravchuk E.S., Novotny V., Gladyshev M.I.
Заглавие : Agent-based modeling of the complex life cycle of a cyanobacterium (Anabaena) in a shallow reservoir
Место публикации : Limnology and Oceanography. - 2008. - Vol. 53, Is. 4. - С. 1227-1241. - ISSN 00243590 (ISSN)
Ключевые слова (''Своб.индексиров.''): algal bloom--annual variation--cyanobacterium--ecological modeling--eulerian analysis--experimental study--lagrangian analysis--life cycle--nutrient availability--phytoplankton--population dynamics--reservoir--shallow water--survival--water column--bugach reservoir--eurasia--krasnoyarsk [russian federation]--russian federation--anabaena--anabaena flos-aquae
Аннотация: The cyanobacterium Anabaena flos-aquae and many other phytoplankton species have a complex life cycle that includes a resting stage (akinete). We present a new agent-based (also known as individual-based) model of Anabaena that includes the formation and behavior of akinetes. The model is part of a coupled Eulerian-Lagrangian model and can reproduce the main features of the observed seasonal and interannual population dynamics in Bugach Reservoir (Siberia), including an unexpectedly large bloom in a year with low nutrient concentrations. Model analysis shows that the internal loading of phosphorus (P) due to germination from the sediment bed is ?10% of the total input. However, most of the long-term nutrient uptake for Anabaena occurs in the sediment bed, which suggests that the sediment bed is not just a convenient overwintering location but may also be the primary source of nutrients. An in silico tracing experiment showed that most water column cells (?90%) originated from cells located in the sediment bed during the preceding winter. An in silico gene knockout experiment (akinete formation is prohibited) showed that the formation of resting stages is of critical importance to the survival of the population on an annual basis. A nutrient-reduction management scenario indicates that Anabaena densities increase because they are less sensitive to water column nutrient levels (because of the sediment bed source) than other species. В© 2008, by the American Society of Limnology and Oceanography, Inc.
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14.

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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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dubovskaya O.P., Gladyshev M.I., Gubanov V.G., Makhutova O.N.
Заглавие : Study of non-consumptive mortality of Crustacean zooplankton in a Siberian reservoir using staining for live/dead sorting and sediment traps
Место публикации : Hydrobiologia. - 2003. - Vol. 504. - С. 223-227. - ISSN 00188158 (ISSN) , DOI 10.1023/B:HYDR.0000008522.88010.45
Ключевые слова (''Своб.индексиров.''): cyclops vicinus--daphnia--live/dead sorting--non-consumptive mortality--sedimentation--reservoirs (water)--sampling--sediment traps--non-consumptive mortality--population dynamics--biodiversity--mortality--population dynamics--reservoir--sediment trap--sedimentation--zooplankton--cladocera--copepoda--crustacea--cyclopia--cyclops--cyclops vicinus--daphnia
Аннотация: We studied non-consumptive (non-predatory) mortality of Daphnia and Cyclops vicinus during four sampling seasons. Mortality estimations were based on live/dead sorting using special staining and measurements of sedimentation rates for dead individuals, depended on wind speed. Original equations were used for calculations. The estimated specific non-consumptive mortality never had biologically senseless negative values, which were often obtained on the basis of the other ways of mortality estimations, and was in a good agreement with other components of population dynamics. As found, the non-consumptive mortality was the important, often the determinant component of the zooplankton population dynamics.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Dubovskaya O.P., Gubanov V.G., Makhutova O.N.
Заглавие : Evaluation of non-predatory mortality of two Daphnia species in a Siberian reservoir
Место публикации : Journal of Plankton Research. - 2003. - Vol. 25, Is. 8. - С. 999-1003. - ISSN 01427873 (ISSN) , DOI 10.1093/plankt/25.8.999
Ключевые слова (''Своб.индексиров.''): estimation method--mortality--zooplankton--russian federation--daphnia--daphnia cucullata--daphnia longispina
Аннотация: A new method of estimating non-predatory mortality of Zooplankton based on live/dead sorting and sediment trap measurement is described. Preliminary results on Daphnia cucullata and Daphnia longispina are given. Estimations of average non-predatory mortality demonstrated a significant contribution of this kind of mortality to total mortality.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kravchuk E.S., Ivanova E.A., Gladyshev M.I.
Заглавие : Seasonal dynamics of the numbers of Anabaena flos-aquae (Lyngb.) Breb. akinetes in the surface layer of bottom sediments and bulk water.
Место публикации : Doklady Biological Sciences. - 2002. - Vol. 384. - С. 233-234. - ISSN 00124966 (ISSN)
Ключевые слова (''Своб.индексиров.''): fresh water--anabaena--article--microbiology--physiology--season--sediment--anabaena--fresh water--geologic sediments--seasons--water microbiology
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Gribovskaya I.V., Moskvicheva A.V., Muchkina E.Y., Chuprov S.M., Ivanova E.A.
Заглавие : Content of metals in compartments of ecosystem of a Siberian pond
Место публикации : Archives of Environmental Contamination and Toxicology. - 2001. - Vol. 41, Is. 2. - С. 157-162. - ISSN 00904341 (ISSN) , DOI 10.1007/s002440010233
Ключевые слова (''Своб.индексиров.''): aluminum--cadmium--calcium--chromium--copper--heavy metal--iron--lead--magnesium--manganese--nickel--potassium--sodium--zinc--aquatic ecosystem--biological uptake--heavy metal--pond--article--bioaccumulation--ecosystem--fish--nonhuman--pond--priority journal--russian federation--sediment--soil pollution--water contamination--animals--ecosystem--environmental monitoring--fishes--geologic sediments--invertebrates--metals, heavy--plants--water pollutants--russian federation
Аннотация: During three field seasons (June-September) of 1997-99 contents of Na, K, Ca, Mg, Fe, Mn, Zn, Cu, Al, Cr, Ni, Cd, and Pb were determined in compartments of ecosystem (surrounding soils, bottom sediments, water, zoobenthos, macrophytes, and fish) of a fish and recreation pond situated at the edge of Krasnoyarsk City (Siberia, Russia). Contents of most parts of metals in soils, water, and macrophytes significantly correlated with each other. As concluded, their contents were determined by natural, general, geochemical peculiarities of the region. Heavy metals, contents of which were higher than federal upper limits of concentration, were revealed. In muscles of fish with different feeding spectra - crucian and perch - concentrations of some metals differed significantly; correlation graphs for metals also had different structures. Comparison of our data with those on diverse aquatic ecosystems of Siberia, Europe, North America, and China published in the last decade was carried out. It was concluded that a distribution of heavy metals in the compartments of an aquatic ecosystem presently have to be determined for each particular water body until general regularities are discovered.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Emelianova A.Y., Kalachova G.S., Zotina T.A., Gaevsky N.A., Zhilenkov M.D.
Заглавие : Gut content analysis of Gammarus lacustris from a Siberian lake using biochemical and biophysical methods
Место публикации : Hydrobiologia. - 2000. - Vol. 431, Is. 2-3. - С. 155-163. - ISSN 00188158 (ISSN)
Ключевые слова (''Своб.индексиров.''): chlorophyll fluorescence--fatty acid composition--viable gut passage--crustacean--diet--saline lake--seston--stomach content--russian federation
Аннотация: We studied the gut contents of Gammarus lacustris from the littoral of Shira lake, a Siberian salt lake, by microscopic analysis in conjunction with measuring of fluorescence of chlorophyll and composition of fatty acids. Gammarus ingested primarily fresh seston, probably settled on the bottom. Additionally, the amphipods obtained essential polyunsaturated fatty acids of ?3 family by selectively consuming bottom sediment particles. A considerable part of the ingested seston comprised cells of Botryococcus sp., which passed the intestinal tract in living form and their photosynthetic activity increased. This viable gut passage was likely one of the causes of bloom of Botryococcus in the littoral. Unlike a number of literature data, there was no selective digestion of any fatty acid species, including polyunsaturated acids, in the intestinal tract.
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