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Найдено документов в текущей БД: 3

    Relationships between the biomass and production of bacterio- and phytoplanktonic communities
/ A. D. Aponasenko, L. A. Shchur // Microbiology. - 2016. - Vol. 85, Is. 2. - P243-248, DOI 10.1134/S0026261716020028 . - ISSN 0026-2617
Аннотация: Quantitative ratios of the biomasses of bacterio- and phytoplankton, interrelation of their production characteristics, and association of the functional characteristics with environmental factors were studied for Lake Khanka, the Yenisei River, and the Krasnoyarsk Reservoir. The ratio between the biomasses of bacterioplankton (Bb) and phytoplankton (Bp) in these water bodies was shown to vary within the range exceeding three orders of magnitude. Bacterioplankton biomass was relatively stable and varied from sample to sample by an order of magnitude. In more than 50% of the samples (total sample number, 495), bacterioplankton biomass exceeded that of the phytoplankton. The average Bb/Bp ratios for Lake Khanka, Yenisei River, and Krasnoyarsk Reservoir were 5.1, 2, and 1.4, respectively. Increased Bb/Bp ratios were found to correlate with elevated specific (per unit biomass) phytoplankton production. This finding indicated additional supply of biogenic elements to phytoplankton due to their recycling by bacterial communities. The ratio between bacterioplankton and phytoplankton production for Lake Khanka varied from year to year (0.07 to 0.76). For the Yenisei River and the Krasnoyarsk Reservoir these ratios were on average 0.19 and 0.27, respectively. According to the literature data for other water bodies, bacterial production may reach from 10 to over 100% of the primary production. The equilibrium density of bacterioplankton (maximal density of the population) in Lake Khanka was ~1.5 times higher than in the Yenisei River and the Krasnoyarsk Reservoir due to higher content of suspended mineral matter and associated organo-mineral detritus in the lake. The interaction between dissolved organic compounds sorbed on the surface of mineral particles results in chemical alteration of biochemically stable substrate into compounds which may be assimilated by aquatic microorganisms. © 2016, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Computational Modelling, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aponasenko, A. D.; Shchur, L. A.

    Analysis of the influence of abiotic factors on the functional activity of plankton communities of the Krasnoyarsk reservoir
[Text] : доклад, тезисы доклада / P. Postnikova, A. Korobko, G. Makarskaya // International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM : 18 / 18th International Multidisciplinary Scientific Geoconference, SGEM 2018 (2018 ; 02.07 - 08.07 ; Albena). - 2018. - 18DOI 10.5593/sgem2018/3.1/S12.007 . -
Аннотация: The main task of complex environmental monitoring is evaluating the state of an aquatic system and state prediction of ecosystem links under different levels of water supply, anthropogenic influence and climatic fluctuations. The paper analyzes the inter-annual dynamics of functional activity of bacterio – and phytoplankton of the Krasnoyarsk reservoir depending on abiotic factors (reservoir filling level and temperature conditions). The data have been obtained from series of regular observations during the growing season in the 2000 – 2017. In the work, distribution of concentration of chlorophyll "a" and photosynthetic activity of the phytoplankton, production characteristics of bacterioplankton and biochemical oxygen demand (BOD5) are presented. The analysis is carried out in the model-driven system of support of hydrobiological studies of the Krasnoyarsk reservoir by the method of k-means. Systematization of accumulated data of scientific research has become a basis for a sequence of long-term investigations, a comparative analysis of data from related studies and data analysis.

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Держатели документа:
Institute of Computational Modeling SB RAS

Доп.точки доступа:
Postnikova, P.; Korobko, A.; Makarskaya, G.; 18th International Multidisciplinary Scientific Geoconference, SGEM 2018(2018 ; 02.07 - 08.07 ; Albena)
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    Исследование функциональной диспеpсной стpуктуpы водных экосистем на примере водоема лессового типа
[Текст] / А. Д. Апонасенко. - [Б. м. : б. и.], 1998. - Б. ц.
Перевод заглавия: The research of functional dispersed structure of water ecosystems as an example loess water body
   Перевод заглавия: The research of functional dispersed structure of water ecosystems as an example loess water body

Аннотация: Сформулировано новое направление, связанное с наличием в водоемах внутренних активных дисперсных границ раздела фаз и оценкой их роли в формировании функциональной структуры экосистем. Разработаны методы изучения функциональной структуры водных экосистем на основе оценки граничных поверхностей раздела фаз различных компонентов взвешенного вещества. На их основе изучено общее содержание взвешенного вещества, степень его дисперсности (количество частиц, их размеры), содержание растворенного органического вещества (РОВ), доля адсорбированного ОВ (АОВ), площади граничной поверхности минеральной и биотической взвесей, обусловленной наличием фаз pаздела взвесь- вода для основных взвешенных компонентов озера Ханка. В частности, структуру экосистемы озера (в летний сезон), выраженную отношением граничных поверхностей дисперсных компонентов, для ряда зоопланктон - простейшие - фитопланктон - бактерии - органический детрит - органо-минеральный детрит (ОМД) можно представить соотношением 1:1:10:30:60:1400. Полевые исследования дополнены лабораторными экспериментами по выявлению роли минерального взвешенного вещества в функционировании экосистем. Большая величина поверхности минеральной взвеси ($100\div200 м. /м. $), значительное количество АОВ (60-90%) и прикрепленной бактериальной микрофлоры (около 40%) определяет активную минерализацию органики через поверхностные взаимодействия. Из этого следует более высокая продуктивность фитопланктона и последующих звеньев пищевой цепи, что играет значительную pоль в функциониpовании экосистемы лессовых водоемов, pегулиpуя потоки трансфоpмации веществ и их концентpаций в сpеде чеpез pазветвленную гpаничную повеpхность. Предложена схема трофометаболических связей планктонного сообщества с включением органо-минерального детрита как важного функционального звена. Оценены адсорбция (прикрепление) бактерий на ОМД в зависимости от массы адсорбированного органического вещества и численности бактериопланктона, а также активность прикрепленного (и агрегированного) бактериопланктона по сравнению со "свободно живущим" в толще воды. Выявлена зависимость удельной первичной продукции от удельной площади поверхности клеток водорослей (S/V) и показана связь S/V с сапробностью водной среды для озера. На основе экспериментальных данных по светорассеянию вод озера Ханка и модельных сред теоретически в приближении Релея-Ганса-Дебая выяснена структура хориона (минеральное ядро+органическая оболочка). Показано влияние минеральной взвеси на активность биохимических процессов, снижение токсичности среды и повышение выживаемости водных организмов.
The new lead of investigation related to the presence in water bodies of internal active phase boundaries and their role to forming of the ecosystems functional structure has been enunciated. The methods for studying the functional structure of the water ecosystems, on the basis of investigating phase boundary areas, were developed. On the basis of this methods the common content of suspended matter, number of suspended particles, its sizies, the content of dissolved organic matter (DOM), part of adsorbed DOM (AOM), the areas of dispersed phase boundaries for mineral and biotic suspended matter were investigated in waters of Khanka lake. The spatial dispersed structure of lake ecosystem attributed with the suspended matter-water phases boundary for main suspended components has been studyed. In particular case the ecosystem structure (in summer season) pronounced with ratio dispersed boundary surfases for sequence zooplankton - protozoa - phytoplankton - bacteria - organic detritus - organo-mineral detritus is 1:1:10:30:60:1400. The field researches are supplemented by laboratory experiments on detection of a role of mineral suspended matter in ecosystems functioning. The great size of surfase of mineral suspended matter ($100\div200 m. /m. ), high amount of DOM adsorbed on huge surface (60-90%) and adsorbed bacterioplankton (about 40%) supposes the active mineralization of DOM by attached microorganisms through the intermediary of surface coupling. Hence more high productivity of the phytoplankton and the subsequent links of the food chain follows play the great part in ecosystem functioning of loess water bodies regulating fluxes of substances transformation and its concentrations in a medium through the intermediary of ramified boundary surface. The scheme of trophometabolic bonding of the planktonic community with incorporating of organo-mineral detritus as important functional link was proposed. The adsorption of bacteria to organo-mineral detritus is appreciated in dependence from mass of adsorbed organic matter and of bacterioplankton numbers. The activity of attached (and aggregated) bacterioplankton is evaluated on a comparison with " freely living " in water mass. Connection of a specific primary production with specific area of algae cells surface (S/V) and connection S/V with saprobity of a water medium are shown. Theoretically in Rayleigh-Gans-Debye approximation on the basis the experimental data on a scattering of light of Khanka lake waters and model mediums the chorion structure (mineral core + organic envelope) on level of separate particle is clarified. The influence of mineral suspended matter for the decrease of toxicity of a medium and for the increase of the survival of water organisms is appreciated.

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Держатели документа:
Институт вычислительного моделирования СО РАН (ИВМ СО РАН)

Доп.точки доступа:
Апонасенко, А.Д.; Aponasenko A.D.
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