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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Adamovich V.V., Rogozin D.Yu., Degermendzhi A.G.
Заглавие : Developing the control criterion for a continuous culture of microorganisms
Место публикации : Mikrobiologiya. - 2005. - Vol. 74, Is. 1. - С. 5-16. - ISSN 00263656 (ISSN)
Ключевые слова (''Своб.индексиров.''): chemostat--control criterion--control factor--microorganism population--sensitivity coefficients--algorithm--bacterium--biological model--biomass--culture medium--ecosystem--growth, development and aging--methodology--microbiological examination--review--algorithms--bacteria--bacteriological techniques--biomass--culture media--ecosystem--models, biological
Аннотация: A short survey and critical analysis of previously proposed criteria for growth control of populations of microorganisms in the chemostat are presented. Based on the analysis of a mathematical model of the steady-state of a microbial population in the chemostat, an adequate control criterion is suggested, along with a method to identify the corresponding regulating factors. The new control criterion is expressed as a product of the factor transformation coefficient and the biomass sensitivity coefficient (SC) with respect to the change of the factor at the chemostat inlet (referred to in the sequel as the biomass SC). The control criterion determines the strength of the control exerted by this or that factor. The method of determination of the regulating factors consists in experimental determination of the real SCs for factors and the biomass and in calculating on this basis the corresponding ideal SCs for constant factor transformation coefficients. The ideal SCs are shown to add up to an integer value, a constraint that we call "quantization" relationships. Such relationships are used to test the completeness of the drawn list of control factors. The proposed method was applied to our own and literature data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Adamovich V.V., Rogozin D.Yu., Degermendzhi A.G.
Заглавие : Developing the control criterion for a continuous culture of microorganisms
Место публикации : Microbiology. - 2005. - Vol. 74, Is. 1. - С. 1-11. - ISSN 00262617 (ISSN) , DOI 10.1007/s11021-005-0021-z
Ключевые слова (''Своб.индексиров.''): chemostat--control criterion--control factor--microorganism population--sensitivity coefficients
Аннотация: A short survey and a critical analysis of previously proposed criteria for growth control of populations of microorganisms in the chemostat are presented. Based on the analysis of a mathematical model of the steady state of a microbial population in the chemostat, an adequate control criterion is suggested, along with a method to identify the corresponding control factors. The new control criterion is expressed as a product of the factor transformation coefficient and the sensitivity coefficient (SC) of the biomass with respect to the change in the factor at the chemostat inlet (hereinafter, the biomass SC). The control criterion determines the strength of the control exerted by a factor. The method of determining control factors consists in experimental determination of the real SCs for factors and the biomass and calculation on this basis of the corresponding ideal SCs, assuming constant factor transformation coefficients. The ideal SCs are shown to add up to integer values, a constraint that we call quantization relationships. Such relationships are used to test the completeness of the list of control factors. The proposed method was applied to both our own and literature data. В© 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mooij W.M., Trolle D., Jeppesen E., Arhonditsis G., Belolipetsky P.V., Chitamwebwa D.B.R., Degermendzhy A.G., DeAngelis D.L., De Senerpont Domis L.N., Downing A.S., Elliott J.A., Fragoso Jr. C.R., Gaedke U., Genova S.N., Gulati R.D., Hakanson L., Hamilton D.P., Hipsey M.R., 't Hoen J., Hulsmann S., Los F.H., Makler-Pick V., Petzoldt T., Prokopkin I.G., Rinke K., Schep S.A., Tominaga K., van Dam A.A., van Nes E.H., Wells S.A., Janse J.H.
Заглавие : Challenges and opportunities for integrating lake ecosystem modelling approaches
Место публикации : Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - С. 633-667. - ISSN 13862588 (ISSN) , DOI 10.1007/s10452-010-9339-3
Ключевые слова (''Своб.индексиров.''): adaptive processes--analysis--aquatic--bifurcation--biodiversity--climate warming--community--eutrophication--fisheries--food web dynamics--freshwater--global change--hydrology--lake--management--marine--mitigation--model integration--model limitations--non-linear dynamics--nutrients--plankton--population--prediction--spatial--understanding--adaptive management--algorithm--aquatic community--biodiversity--ecosystem modeling--eutrophication--fishery production--food web--fuzzy mathematics--global warming--hydrology--lake ecosystem--mitigation--model test--numerical model--nutrient availability--plankton--prediction--saline lake--spatial analysis
Аннотация: A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others ('reinventing the wheel'). The other challenge is to avoid focusing on only one type of model, while ignoring new and diverse approaches that have become available ('having tunnel vision'). In this paper, we aim at improving the awareness of existing models and knowledge of concurrent approaches in lake ecosystem modelling, without covering all possible model tools and avenues. First, we present a broad variety of modelling approaches. To illustrate these approaches, we give brief descriptions of rather arbitrarily selected sets of specific models. We deal with static models (steady state and regression models), complex dynamic models (CAEDYM, CE-QUAL-W2, Delft 3D-ECO, LakeMab, LakeWeb, MyLake, PCLake, PROTECH, SALMO), structurally dynamic models and minimal dynamic models. We also discuss a group of approaches that could all be classified as individual based: super-individual models (Piscator, Charisma), physiologically structured models, stage-structured models and trait-based models. We briefly mention genetic algorithms, neural networks, Kalman filters and fuzzy logic. Thereafter, we zoom in, as an in-depth example, on the multi-decadal development and application of the lake ecosystem model PCLake and related models (PCLake Metamodel, Lake Shira Model, IPH-TRIM3D-PCLake). In the discussion, we argue that while the historical development of each approach and model is understandable given its 'leading principle', there are many opportunities for combining approaches. We take the point of view that a single 'right' approach does not exist and should not be strived for. Instead, multiple modelling approaches, applied concurrently to a given problem, can help develop an integrative view on the functioning of lake ecosystems. We end with a set of specific recommendations that may be of help in the further development of lake ecosystem models. В© 2010 The Author(s).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Degermendzhy A.G., Zadereev E.S., Rogozin D.Y., Prokopkin I.G., Barkhatov Y.V., Tolomeev A.P., Khromechek E.B., Janse J.H., Mooij W.M., Gulati R.D.
Заглавие : Vertical stratification of physical, chemical and biological components in two saline lakes Shira and Shunet (South Siberia, Russia)
Место публикации : Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - С. 619-632. - ISSN 13862588 (ISSN) , DOI 10.1007/s10452-010-9336-6
Ключевые слова (''Своб.индексиров.''): ciliates--cryptomonas--fishless lakes--gammarus--mathematical modelling--meromictic lakes--phytoplankton--stratification--sulphur bacteria--amphipod--bacterium--biomass--ciliate--ecosystem modeling--flagellate--meromictic lake--microbial community--numerical model--physicochemical property--phytoplankton--population density--saline lake--salinity--stratification--thermocline--trophic interaction--vertical profile--zooplankton--khakassia--lake shira--lake shunet--russian federation--siberia--amphipoda--bacteria (microorganisms)--ciliophora--copepoda--cryptomonas--cryptomonas sp.--gammaridae--gammarus--gammarus lacustris--phytomastigophorea--protista--rotifera
Аннотация: A feature of meromictic lakes is that several physicochemical and biological gradients affect the vertical distribution of different organisms. The vertical stratification of physical, chemical and biological components in saline, fishless meromictic lakes Shira and Shunet (Siberia, Russia) is quite different mainly because both mean depth and maximum depth of lakes differ as well as their salinity levels differ. The chemocline of the Lake Shira, as in many meromictic lakes, is inhabited by bacterial community consisting of purple sulphur and heterotrophic bacteria. As the depth of the chemocline is variable, the bacterial community does not attain high densities. The mixolimnion in Lake Shira, which is thermally stratified in summer, also creates different habitat for various species. The distribution of phytoplankton is non-uniform with its biomass peak in the metalimnion. The distribution of zooplankton is also heterogeneous with rotifers and juvenile copepods inhabiting the warmer epilimnion and older copepods found in the cold but oxic hypolimnion. The amphipod Gammarus lacustris which can be assigned to the higher trophic link in the fishless lake's ecosystem, such as Lake Shira, is also distributed non-uniformly, with its peak density generally observed in the thermocline region. The chemocline in Lake Shunet is located at the depth of 5 m, and unlike in Lake Shira, due to a sharp salinity gradient between the mixolimnion and monimolimnion, this depth is very stable. The mixolimnion in Lake Shunet is relatively shallow and the chemocline is inhabited by (1) an extremely dense bacterial community; (2) a population of Cryptomonas sp.; and (3) ciliate community comprising several species. As the mixolimnion of Lake Shunet is not thermally stratified for long period, the phytoplankton and zooplankton populations are not vertically stratified. The gammarids, however, tend to concentrate in a narrow layer located 1-2 m above the chemocline. We believe that in addition to vertical inhomogeneities of both physicochemical parameters, biological and physical factors also play a role in maintaining these inhomogeneities. We conclude that the stratified distributions of the major food web components will have several implications for ecosystem structure and dynamics. Trophic interactions as well as mass and energy flows can be significantly impacted by such heterogeneous distributions. Species spatially separated even by relatively short distances, say a few centimetres will not directly compete. Importantly, we demonstrate that not only bacteria, phytoflagellates and ciliate tend to concentrate in thin layers but also larger-sized species such Gammarus (amphipods) can also under certain environmental conditions have stratified distribution with maxima in relatively thin layer. As the vertical structure of the lake ecosystem is rather complex in such stratified lakes as ours, the strategy of research, including sampling techniques, should consider potentially variable and non-homogeneous distributions. В© 2010 The Author(s).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tolomeyev A.P., Zadereev E.S., Degermendzhy A.G.
Заглавие : Fine stratified distribution of Gammarus lacustris sars (Crustacea: Amphipoda) in the pelagic zone of the meromictic Lake Shira (Khakassia, Russia)
Место публикации : Doklady Biochemistry and Biophysics. - 2006. - Vol. 411, Is. 1. - С. 346-348. - ISSN 16076729 (ISSN) , DOI 10.1134/S1607672906060068
Ключевые слова (''Своб.индексиров.''): fresh water--animal--article--crustacea--demography--ecosystem--physiology--population dynamics--animals--crustacea--demography--ecosystem--fresh water--population dynamics--amphipoda--crustacea--gammarus--gammarus lacustris
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nekrasov V.M., Chernychev A.V., Degermendzhy A.G.
Заглавие : The "quantization" of sensitivity coefficients is preserved in microbial populations heterogeneous with respect to growth rate and age
Место публикации : Doklady Biological Sciences. - 2006. - Vol. 406, Is. 1-6. - С. 91-93. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496606010261
Ключевые слова (''Своб.индексиров.''): algorithm--article--bacterium--biodiversity--growth, development and aging--population dynamics--theoretical model--time--algorithms--bacteria--biodiversity--models, theoretical--population dynamics--time factors
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rogozin D.Yu., Pimenov N.V., Kosolapov D.B., Chan'kovskaya Yu.V., Degermendzhy A.G.
Заглавие : Thin-layer vertical distribution of purple sulfur bacteria in the chemoclines of meromictic lakes Shira and Shunet (Khakasia, Southern Siberia)
Место публикации : Doklady Akademii Nauk. - 2005. - Vol. 400, Is. 3. - С. 426-429. - ISSN 08695652 (ISSN)
Ключевые слова (''Своб.индексиров.''): bacteria--bathymetry--biochemistry--geochemistry--physical chemistry--water bacteriology--bathometers--vertical distribution--lakes
Аннотация: Vertical inhomogeneity of microbial population, biogeochemical processes and physicochemical characteristics of chemocline was revealed using specially created stratification bathometer (sampler) consisting of syringes horizontally placed one over another on a carrying frame.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gitelson I.I., Degermendzhy A.G., Rodicheva E.K.
Заглавие : Self-restoration as fundamental property of CES providing their sustainability
Место публикации : Advances in Space Research. - 2003. - Vol. 31, Is. 7. - С. 1641-1648. - ISSN 02731177 (ISSN) , DOI 10.1016/S0273-1177(03)00111-X
Ключевые слова (''Своб.индексиров.''): biocatalysts--ecosystems--genes--life support systems (spacecraft)--radiation damage--cell populations--space flight--space shuttle--article--biological model--biomass--cell division--chlorella--cytology--growth, development and aging--microclimate--radiation exposure--radiation response--ultraviolet radiation--biomass--cell division--chlorella--dose-response relationship, radiation--ecological systems, closed--life support systems--models, biological--ultraviolet rays
Аннотация: Sustainability is one of the most important criteria and evaluation of human life support systems intended for use during long space flights. The common feature of biological and physicochemical life support systems is that basically they are both catalytic. But there are two fundamental properties distinguishing biological systems: 1) they are auto-catalytic: their catalysts - enzymes of protein nature - are continuously reproduced when the system functions; 2) the program of every process performed by enzymes and the program of their reproduction are inherent in the biological system itself - in the totality of genomes of the species involved in the functioning of the ecosystem. Actually, one cell with the genome capable of the phenotypic realization is enough for the self-restoration of the function performed by the cells of this species in the ecosystem. The continuous microalgal culture of Chlorella vulgaris was taken to investigate quantitatively the process of self-restoration in unicellular algae population. Based on the data obtained, we proposed a mathematical model of the restoration process in a cell population that has suffered an acute radiation damage. В© 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
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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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Adamovich V.V., Zotina T.A., Degermendzhy A.G.
Заглавие : Interaction coefficients in the Lake Shira algal-bacterial community
Место публикации : Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - С. 261-270. - ISSN 13862588 (ISSN) , DOI 10.1023/A:1015638420766
Ключевые слова (''Своб.индексиров.''): bacterioplankton--feedback coefficient--influence coefficient--phytoplankton--specific growth rate--bacterioplankton--interspecific interaction--microbial community--phytoplankton--quantitative analysis--saline lake--russian federation--algae--bacteria (microorganisms)
Аннотация: A new method is proposed to evaluate the interaction coefficients in microbial communities interacting due to physical-chemical environmental factors. This method differs from the classical one suggested by E.P.Odum. Redefinition of the interaction coefficients allows the evaluation of the experimental (actual) and theoretical values of the coefficients for the hypothetical interaction layout. The interaction layout is considered to be a set of factors, the values of their transformation ratios and the form of dependence of a population's specific growth rate on these factors. A comparison of theoretical and experimental values of interaction coefficients enables us to assess the adequacy of the hypothetical interaction scheme in the microbial communities. The aim of the work is to test the suggested method on a natural algal-bacterial community of Shira Lake (Khakasia, Russia), which has been the object of detailed and concerted limnological studies and for which detailed data are available. Feedback coefficients of phyto- and bacterioplankton and the coefficients of influence of phytoplankton on bacterioplankton have been defined. Dominance of negative experimental IC values has been experimentally shown, which is indicative of the negative feedback in bacterio- and phytoplankton links of Shira Lake and of negative interpopulation (phytoplankton on bacterioplankton) interactions. The considerable differences observed between the experimental and theoretical coefficients indicates inadequacy of the assumed interaction layout of the community under study. Further investigations are needed to provide a precise sketch of the interactions.
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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Lepskaya E.V., Sushchik N.N., Makhutova O.N., Kalacheva G.S.
Заглавие : Differences in fatty acid composition between smolts of Sockeye Salmon and adults migrated from sea to lake for spawning
Место публикации : Doklady Biochemistry and Biophysics. - 2010. - Vol. 430, Is. 1. - С. 29-32. - ISSN 16076729 (ISSN) , DOI 10.1134/S1607672910010096
Ключевые слова (''Своб.индексиров.''): fatty acid--fresh water--sea water--animal--article--chemistry--cytology--female--male--metabolism--muscle--physiology--population migration--reproduction--salmon--sea--animal migration--animals--fatty acids--female--fresh water--male--muscles--oceans and seas--reproduction--salmon--seawater--oncorhynchus nerka
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Gladyshev M.I., Makhutova O.N., Kravchuk E.S., Dubovskaya O.P., Kalacheva G.S.
Заглавие : Seasonal transfer of the pool of the essential eicosapentaenoic acid along the pelagic trophic chain of a eutrophic reservoir
Место публикации : Doklady Biological Sciences. - 2008. - Vol. 422, Is. 1. - С. 355-356. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496608050232
Ключевые слова (''Своб.индексиров.''): fresh water--icosapentaenoic acid--article--biomass--metabolism--microbiology--phytoplankton--population density--river--russian federation--season--biomass--eicosapentaenoic acid--fresh water--phytoplankton--population density--rivers--russia--seasons--water microbiology
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14.

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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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Sushchik N.N., Dubovskaya O.P., Makhutova O.N., Kalachova G.S.
Заглавие : Influence of sestonic elemental and essential fatty acid contents in a eutrophic reservoir in Siberia on population growth of Daphnia (longispina group)
Место публикации : Journal of Plankton Research. - 2006. - Vol. 28, Is. 10. - С. 907-917. - ISSN 01427873 (ISSN) , DOI 10.1093/plankt/fbl028
Ключевые слова (''Своб.индексиров.''): eutrophic environment--fatty acid--multiple regression--particulate organic nitrogen--plankton--population growth--reservoir--seston--eurasia--siberia--daphnia
Аннотация: Dependence of specific integral population growth rate or specific production rate of populations with random size and age structure on elemental and essential fatty acid composition of natural seston was studied in a laboratory flow-through system using a multiple regression. Under a comparatively high content of particulate phosphorus (P), the best single predictor of the growth appeared to be content of eicosapentaenoic acid (EPA, 20:5?3), as it was found earlier for somatic growth of even-aged populations of Daphnia. Regression equation with two independent variables, EPA and particulate nitrogen (N), gave a significantly better fit for the population growth as the dependent variable than the equation with EPA as the single independent variable. Interestingly, there was no significant correlation between N as the single variable and the growth. The essential ?3 fatty acid and N appeared to be complementary indicators of the food quality, which probably limited different constituents (reproductive and somatic) of the integral population growth under the high content of particulate P. В© The Author 2006. Published by Oxford University Press. All rights reserved.
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16.

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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17.

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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zadereev E.S., Tolomeyev A.P., Drobotov A.V., Emeliyanova A.Y., Gubanov M.V.
Заглавие : The vertical distribution and abundance of Gammarus lacustris in the pelagic zone of the meromictic lakes Shira and Shunet (Khakassia, Russia)
Место публикации : Aquatic Ecology. - 2010. - Vol. 44, Is. 3. - С. 531-539. - ISSN 13862588 (ISSN) , DOI 10.1007/s10452-010-9329-5
Ключевые слова (''Своб.индексиров.''): amphipod--gammarus lacustris--meromictic lake--thermocline--vertical distribution--abundance--amphipod--dissolved oxygen--intertidal environment--meromictic lake--pelagic environment--seston--stratification--thermocline--vertical distribution--videography--water temperature--khakassia--lake shira--lake shunet--russian federation--amphipoda--animalia--gammarus--gammarus lacustris
Аннотация: The vertical distribution and abundance of Gammarus lacustris in the pelagic zone of two fishless meromictic lakes, L. Shira and L. Shunet, in Southern Siberia (Russia), was studied with the underwater video recording system and using vertical hauls. In both lakes, during summer stratification, Gammarus was distributed non-homogenously, with a stable peak in the metalimnion. The average depth of Gammarus population in the pelagic zone was significantly correlated with the depth of the thermocline. Gammarus abundances obtained using vertical plankton hauls with net were quite comparable with those obtained from video records. The peak abundance of Gammarus in the pelagic zone of the lakes observed with underwater video amounted up to 400 individuals m-2, while the peak animal densities in the metalimnion reached 50 ind. m-3. The data are compared with previously published abundances of Gammarus in the littoral of Lake Shira. Both littoral and pelagic can be equally important habitats for amphipods in meromictic lakes. The absence of fish in the pelagic zone, high oxygen concentration, low water temperature, increased seston concentration, elevated water density in the metalimnion and the anoxic hypolimnion can be the most probable combination of factors that are responsible for the peak of Gammarus in the metalimnion of these lakes. В© 2010 Springer Science+Business Media B.V.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zadereev E.S., Prokopkin I.G.
Заглавие : Role of diapause in coexistence of zooplankton species: Model analysis
Место публикации : Doklady Biological Sciences. - 2007. - Vol. 412, Is. 1. - С. 73-75. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496607010243
Ключевые слова (''Своб.индексиров.''): animal--article--biological model--cladocera--ecosystem--female--growth, development and aging--oocyte--physiology--population dynamics--reproduction--zooplankton--animals--cladocera--ecosystem--female--models, biological--ovum--population dynamics--reproduction--zooplankton
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zadereev E.S., Prokopkin I.G., Gubanov V.G., Gubanov M.V.
Заглавие : Individual-based model of the reproduction cycle of Moina macrocopa (Crustacea: Cladocera)
Место публикации : Ecological Modelling. - 2003. - Vol. 162, Is. 1-2. - С. 15-31. - ISSN 03043800 (ISSN) , DOI 10.1016/S0304-3800(02)00348-4
Ключевые слова (''Своб.индексиров.''): change of reproduction mode--cladocera--individual-based model--metabolic by-products--ecological modeling--individual-based model--reproductive cycle--animalia--cladocera--crustacea--moina macrocopa
Аннотация: An individual-based model of cyclic development of Cladocera populations was developed on the basis of experimental data. The model takes into account the following processes describing the development of an individual animal: maturation, transition into other reproductive classes, selection of the reproduction mode (parthenogenetic or gamogenetic), release of parthenogenetic progeny and death. The model assumes that switching from asexual to sexual reproduction is controlled by the concentration of food and metabolic by-products of the animal population. Verification of the model by independent experiments demonstrated that (1) during population growth, metabolic by-products build up in the medium, and (2) the effect of metabolic by-products on gamogenesis induction depends on concentration. The hypothesis that the effect of regulating reproductive switching factors should synchronise the development of population with the change of environmental conditions in order to ensure production of the maximum number of diapausing eggs was tested. It is shown that combination of regulating reproductive switching factors maximises the production of diapausing eggs. В© 2002 Elsevier Science B.V. All rights reserved.
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