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

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

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

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Comparative Estimation of the Plutonium (238Pu, 239+240Pu) and Radiocesium (137Cs) Content in Bottom Sediments and Hydrobionts of the Yenisei River / T. A. Zotina, M. S. Melgunov, D. V. Dementyev, Y. V. Alexandrova // Dokl. Earth Sci. - 2020. - Vol. 492, Is. 2. - P434-437, DOI 10.1134/S1028334X20060227 . - ISSN 1028-334X
Кл.слова (ненормированные):
Apatania crymophyla -- Fontinalis antipyretica -- plutonium -- radiocesium -- zoobenthos -- Isotopes -- Nuclear fuels -- Plutonium -- Rivers -- Bottom sediments -- Comparative estimation -- Hydrobionts -- Plutonium isotopes -- Radioactive discharges -- Radiocesium -- Specific activity -- Yenisei rivers -- River pollution
Аннотация: Abstract: The contents of isotopes of plutonium (238Pu and 239, 240Pu) and 137Cs in samples of bottom sediments and hydrobionts (water moss, amphipods, and caddisfly larvae with casings) taken in the Yenisei River in the vicinity of the radioactive discharge from the Mining and Chemical Combine in 2012 and 2018 were comparatively estimated. It is shown that the content and ratios between the specific activities of plutonium isotopes (238/239 and 240) in samples of BSs and hydrobionts increased after the recommencing of plutonium discharges into the Yenisei due to the beginning of MOX fuel production. The background content and the ratio between plutonium isotopes in BSs of the Yenisei were estimated for the first time. Hydrobionts and BSs were ranged differently according to the content of plutonium and 137Cs: we recorded the highest content of 137Cs in BSs and that of plutonium in water moss. The plutonium content in hydrobionts of the Yenisei River varies considerably, which permits specification of representatives of biota (water moss and caddisfly larvae with casings) that, along with BSs, can be used as effective indicators of ecosystem pollution with plutonium. © 2020, Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Institute of Biophysics, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Zotina, T. A.; Melgunov, M. S.; Dementyev, D. V.; Alexandrova, Y. V.

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Comparative Estimation of the Plutonium (Pu-238,Pu239+240) and Radiocesium (Cs-137) Content in Bottom Sediments and Hydrobionts of the Yenisei River / T. A. Zotina, M. S. Melgunov, D. V. Dementyev, Y. V. Alexandrova // Dokl. Earth Sci. - 2020. - Vol. 492, Is. 2. - P434-437, DOI 10.1134/S1028334X20060227. - Cited References:13. - This work was supported by the Russian Foundation for Basic Research and the Krasnoyarsk Regional Foundation for the Support of Scientific and Technological Activities, project no. 18-44-240003, and was conducted according to a State Assignment of the Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, and of the Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences. . - ISSN 1028-334X. - ISSN 1531-8354

РУБ Geosciences, Multidisciplinary
Рубрики:
OB
Кл.слова (ненормированные):
Fontinalis antipyretica -- Apatania crymophyla -- plutonium -- radiocesium -- zoobenthos
Аннотация: The contents of isotopes of plutonium (Pu-238 and(239, 240)Pu) and(137)Cs in samples of bottom sediments and hydrobionts (water moss, amphipods, and caddisfly larvae with casings) taken in the Yenisei River in the vicinity of the radioactive discharge from the Mining and Chemical Combine in 2012 and 2018 were comparatively estimated. It is shown that the content and ratios between the specific activities of plutonium isotopes (238/239 and 240) in samples of BSs and hydrobionts increased after the recommencing of plutonium discharges into the Yenisei due to the beginning of MOX fuel production. The background content and the ratio between plutonium isotopes in BSs of the Yenisei were estimated for the first time. Hydrobionts and BSs were ranged differently according to the content of plutonium and(137)Cs: we recorded the highest content of(137)Cs in BSs and that of plutonium in water moss. The plutonium content in hydrobionts of the Yenisei River varies considerably, which permits specification of representatives of biota (water moss and caddisfly larvae with casings) that, along with BSs, can be used as effective indicators of ecosystem pollution with plutonium.

WOS
Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Inst Geol & Mineral, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Zotina, T. A.; Melgunov, M. S.; Dementyev, D., V; Alexandrova, Yu, V; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Regional Foundation for the Support of Scientific and Technological Activities [18-44-240003]

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Oil Spills in Fresh Waters and State of Ecosystem of Lake Pyasino before the Incidental Spill of 2020 / M. I. Gladyshev // Contemp. Probl. Ecol. - 2021. - Vol. 14, Is. 4. - P313-322, DOI 10.1134/S1995425521040041. - Cited References:50. - This work was supported by Federal Tasks no. 223-EP2020/07 with the Siberian Branch of the Russian Academy of Sciences and by State Assignment as a part of Basic Research of the Russian Federation, topic no. 51.1.1. . - ISSN 1995-4255. - ISSN 1995-4263

РУБ Ecology
Рубрики:
POLYUNSATURATED FATTY-ACIDS
   PECHORA BASIN
   RIVER
   ZOOPLANKTON
Кл.слова (ненормированные):
petroleum pollution -- plankton -- benthos -- ichthyofauna -- water quality -- Arctic lakes
Аннотация: This article presents the history of large oil spills in freshwaters, considering the processes of physicochemical and biological degradation of oil. It discusses the toxicity of oil for hydrobionts and effects of oil pollution on communities of plankton, benthos, and ichthyofauna, as well as challenges in mitigating the environmental impact of oil spills. The discussion is concerned with the state of the ecosystem in Lake Pyasino before the incidental spill of 2020, specifically, hydrochemical indicators; species composition; and abundance and biomass of plankton, benthos, and fish. Candidate technologies for restoring the Lake Pyasino ecosystem are reviewed, including "bottom-up" biomanipulation.

WOS
Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Inst Biophys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Gladyshev, M. I.; Siberian Branch of the Russian Academy of SciencesRussian Academy of Sciences [223-EP2020/07]; Basic Research of the Russian Federation [51.1.1]

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