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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.

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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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Formation of the vertical heterogeneity in the Lake Shira ecosystem: The biological mechanisms and mathematical model / A. G. Degermendzhy [et al.] // Aquatic Ecology. - 2002. - Vol. 36, Is. 2. - P271-297, DOI 10.1023/A:1015621508971 . - ISSN 1386-2588
Кл.слова (ненормированные):
Hydrogen sulphide -- Phytoplankton -- Stratification control -- Sulphate-reducing bacteria -- Sulphur cycle -- Vertical model -- biological production -- community structure -- ecosystem modeling -- nutrient cycling -- plankton -- saline lake -- seasonal variation -- vertical distribution -- Russian Federation -- algae -- Arctodiaptomus -- Bacteria (microorganisms) -- Calanoida -- Chlorophyta -- Copepoda -- Crustacea -- Cyanobacteria -- Dictyosphaerium -- Lyngbya -- Lyngbya contorta
Аннотация: Data on the seasonal changes in vertical heterogeneity of the physical-chemical and biological parameters of the thermally stratified Shira Lake ecosystem (Khakasia, Siberia) in 1996-2000 have been analyzed. The interaction mechanisms involving: (1) The plankton populations in aerobic and anaerobic zones, involving the cycling of carbon and sulphur, (2) the primary production limitation (by light and phosphorus) and inhibition (by light), and (3) the kinetic characteristics of plankton populations have been elucidated. A mathematical model of the vertical structure of the lake's plankton populations, based on the ecosystem description and on vertical turbulent diffusion of the matter, has been constructed. The green alga Dictyosphaerium tetrachotomum (Chlorophyta) and the cyanobacterium Lyngbya contorta (Cyanophyta), which dominated the phytoplankton biomass, were taken as oxygen producers. Arctodiaptomus salinus (a calanoid copepod) has been assumed as the main grazer in Shira Lake as it dominated the zooplankton biomass. Four groups of microorganisms involved in the sulphur cycle formation have been distinguished: sulphur, sulphur purple, sulphur green and SRB. H2S is oxidized to sulphate (only the green sulphur bacteria oxidize it to sulphur), and sulphate is reduced to H2S, forming neither sulphur nor its water-soluble compounds. The role of grazing, light and nutrient limitation, in forming the vertical inhomogeneities, particularly in lowering the depth of the maximal cyanobacterial biomass, has been demonstrated. When the model takes into account both light limitation and nutrient limitation of algal growth by P and consumption of algae by crustaceans: (a) in the scenario where the P is formed only by the cycling and decomposition of autochthonous organic matter, both the green algae and cyanobacteria are eliminated; (b) in the scenario involving an additional P flux in the deep water layers the peak of the cyanobacteria is at a depth of 10 m, and its amplitude is close to the one observed in the lake. The position of the peak remains stable owing to the 'double' limitation mechanism: light 'from above' and P 'from below'. Another mechanism responsible for the deep position of the peak of cyanobacteria was analyzed mathematically based on the model involving the experimentally proven assumption of the growth inhibition by light in the epilimnion and the light limitation in the hypolimnion. The main result is: the peak is positioned stable at its depth and does not change with time. The analytical and numerical calculations made for this positioning mechanism yielded the formulae relating the depth of the maximum of algal biomass, the 'width' of the peak base and the peak amplitude and a number of parameters (algae elimination, turbulent diffusion coefficient, sedimentation rate, light extinction coefficient and light intensity). The theoretical curves for the stratification of chemical and biological parameters have been brought in conformity with field observations, e.g. for the different patterns for the peaks, and 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. For the first time, theoretically, 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 discriminated. The theoretical limit for the depth up to which the hydrogen-sulphide zone can ascend under the impact of allochthonous organic loading, has been determined.

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

Доп.точки доступа:
Degermendzhy, A.G.; Belolipetsky, V.M.; Zotina, T.A.; Gulati, R.D.

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A circadian rhythm of grazing of microalgae by a laboratory cultureof Ceriodaphnia quadrangula / V. I. Kolmakov [et al.] // Biofizika. - 2002. - Vol. 47, Is. 4. - P676 . - ISSN 0006-3029
Кл.слова (ненормированные):
Daily rhythm of grazing -- Flowing-through cultivator -- Fluorescence -- Microalgae -- Photoperiod -- Statistical spectral analysis -- algae -- Animalia -- Ceriodaphnia quadrangula -- Chlorella vulgaris -- Chlorophyta
Аннотация: The circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula under continuous illumination was studied by continuous registration of chlorophyll fluorescence at the outlet of a flow-through cultivator. A culture of green alga Chlorella vulgaris was used as a feed. The data obtained were treated by the statistical spectral analysis. It was found that animals preliminarily grown under a 12 h light : 12 h dark regime and transferred to constant light showed two maxima in the circadian rhythm of grazing with periods of 0.7 and 1.1 h. Animals preliminarily grown under constant light showed no circadian rhythm of grazing. It was concluded that the circadian rhythm of grazing of C. quadrangula has endogenous nature and can change according to light conditions.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk Slate University, pr. Svobodnyi 79, Krasnoyarsk, 660042, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kolmakov, V.I.; Levin, L.A.; Dubovskaya, O.P.; Gladyshev, M.I.

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Circadian rhythms of feeding with microalgae of Ceriodaphnia quadrangula in laboratory culture / V. I. Kolmakov [и др.] // Biofizika. - 2002. - Vol. 47, Is. 4. - С. 673-676 . - ISSN 0006-3029
Кл.слова (ненормированные):
chlorophyll -- alga -- animal -- article -- chemistry -- circadian rhythm -- Crustacea -- fluorometry -- growth, development and aging -- photoperiodicity -- physiology -- Algae -- Animals -- Chlorophyll -- Circadian Rhythm -- Crustacea -- Fluorometry -- Photoperiod
Аннотация: The circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula under continuous illumination was studied by continuous registration of chlorophyll fluorescence at the outlet of a flow-through cultivator. A culture of green alga Chlorella vulgaris was used as a feed. The data obtained were treated by the statistical spectral analysis. It was found that animals preliminarily grown under a 12 h light: 12 h dark regime and transferred to constant light showed two maxima in the circadian rhythm of grazing with periods of 0.7 and 1.1 h. Animals preliminarily grown under constant light showed no circadian rhythm of grazing. It was concluded that the circadian rhythm of grazing of C. quadrangula has endogenous nature and can change according to light conditions.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia. : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kolmakov, V.I.; Levin, L.A.; Dubovskaia, O.P.; Gladyshev, M.I.

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Competition between links in "producers-consumer" trophic chains in an aquatic closed system with spatially separated components / T. I. Pisman, N. S. Pechurkin, L. A. Somova // Advances in Space Research. - 2001. - Vol. 27, Is. 9. - P1599-1603, DOI 10.1016/S0273-1177(01)00255-1 . - ISSN 0273-1177
Кл.слова (ненормированные):
Algae -- Aquifers -- Biodiversity -- Metabolism -- Nitrogen -- Protozoa -- Aquatic closed systems -- Spatially separated components -- Space research -- aquatic ecosystem -- competition -- grazing -- primary production -- fresh water -- nitrogen -- animal -- article -- Chlorella -- food chain -- green alga -- metabolism -- microclimate -- Paramecium -- Rotifera -- Algae, Green -- Animals -- Chlorella -- Ecological Systems, Closed -- Food Chain -- Fresh Water -- Nitrogen -- Paramecium -- Rotifera
Аннотация: The work analyzes functioning of a "producer-consumer" closed aquatic system with spatially separated links, where each component consisted of two species. Producers in the system were the microalgae of Chlorella vulgaris and Scenedesmus sp., consumers - Paramecium caudatum infusoria and Brachionus sp. rotifers. In the experiment the competing predators were consuming on a mixed culture of algae, and the competition of algae was studied under nitrogen limitation. Under these conditions competitiveness of Scenedemus was higher than that of Chlorella vulgaris. Metabolism products of Scenedesmus algae have been found to have negative effect on reproduction of Paramecium caudatum protozoa. Predator population dynamics in the "consumer" link demonstrated that the rotifers that consume two algal species are more competitive compared to protozoa feeding on chlorella only. В© 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

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

Доп.точки доступа:
Pisman, T.I.; Pechurkin, N.S.; Somova, L.A.

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Experimental and mathematical models for small aqueous closed ecosystems with spatially separated components / T. I. Pisman [et al.] // Advances in Space Research. - 1999. - Vol. 24, Is. 3. - P361-366, DOI 10.1016/S0273-1177(99)00486-X . - ISSN 0273-1177
Кл.слова (ненормированные):
carbon dioxide -- nitrogen -- oxygen -- quaternary ammonium derivative -- aquatic environment -- artificial ecosystem -- ecological modeling -- trophic interaction -- animal -- article -- biological model -- Candida -- Chlorella -- fermentation -- mathematics -- metabolism -- microclimate -- Paramecium -- photosynthesis -- Animals -- Candida -- Carbon Dioxide -- Chlorella -- Ecological Systems, Closed -- Fermentation -- Mathematics -- Models, Biological -- Nitrogen -- Oxygen -- Paramecium -- Photosynthesis -- Quaternary Ammonium Compounds
Аннотация: Experimental and theoretical models of closed 'autotroph-heteretroph' (chlorella-yeast, chlorella- protozoa) ecosystems with spatially separated components have been created and studied. The chart of flows and interaction of components of gas-closed 'chlorella-yeast' system have formed the basis describe mathematically the functioning of the given system, experimental results have been found to agree with computer solution of the problem in terms of quality. Investigation of the experimental model of the 'producer-consumer' trophic chain demonstrated the role of protozoa in nitrogen turnover. 'Production-decomposition' and 'production-grazing-decomposition' cycle models has been theoretically analyzed and compared. The predator has been shown to be a more intensive mineralizer than the reducer component.

Scopus
Держатели документа:
Institute of Biophysics (Russian Academy of Sciences, Siberian Branch), Krasnoyarsk 6600036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Pisman, T.I.; Pechurkin, N.S.; Babkin, A.V.; Somova, L.A.; Sarangova, A.B.

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Daily rhythm of grazing of Ceriodaphnia quadrangula on microalgae by data of continuous fluorometry in flowing cultivator [Текст] / M. I. Gladyshev [и др.] // Dokl. Akad. Nauk. - 1997. - Vol. 356, Is. 4. - P. 548-550. - Cited References: 7 . - ISSN 0869-5652

РУБ Multidisciplinary Sciences

WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50
Доп.точки доступа:
Gladyshev, M.I.; Kolmakov, V.I.; Levin, L.A.; Dubovskaya, O.P.

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A circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula [Текст] / V. I. Kolmakov [и др.] // Biofizika. - 2002. - Vol. 47, Is. 4. - P. 673-676. - Cited References: 12 . - ISSN 0006-3029

РУБ Biophysics
Рубрики:
CLOSED CULTIVATORS
FLUORESCENCE
ZOOPLANKTON
Кл.слова (ненормированные):
daily rhythm of grazing -- fluorescence -- microalgae -- flowing-through cultivator -- photoperiod -- statistical spectral analysis
Аннотация: The circadian rhythm of grazing of microalgae by a laboratory culture of Ceriodaphnia quadrangula under continuous illumination was studied by continuous registration of chlorophyll fluorescence at the outlet of a flow-through cultivator. A culture of green alga Chlorella vulgaris was used as a feed. The data obtained were treated by the statistical spectral analysis. It was found that animals preliminarily grown under a 12 h light : 12 h dark regime and transferred to constant light showed two maxima in the circadian rhythm of grazing with periods of 0.7 and 1.1 h. Animals preliminarily grown under constant light showed no circadian rhythm of grazing. It was concluded that the circadian rhythm of grazing of C quadrangula has endogenous nature and can change according to light conditions.

WOS
Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660042, Russia
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kolmakov, V.I.; Levin, L.A.; Dubovskaya, O.P.; Gladyshev, M.I.

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The Restoration Dynamics of Fallow Vegetation in the Steppe Zone of the Khakassia Republic Based on Terrain and Satellite Data / I. Y. Botvich, T. M. Zorkina // Biophysics. - 2019. - Vol. 64, Is. 2. - P309-315, DOI 10.1134/S0006350919020039 . - ISSN 0006-3509
Кл.слова (ненормированные):
fallow lands -- long-term variability (structure -- MODIS -- NDVI -- phytomass) -- projective cover -- restoration of natural vegetation -- satellite and terrain research methods
Аннотация: Abstract: The dynamics and specific features of the restoration of forbs–grass–wormwood and wormwood–grass phytocoenoses on fallow lands in the Altai region, the Republic of Khakassia, were determined on the basis of terrain and satellite data. The species composition, structure, and phytomass of the phytocoenoses were revealed. A gradual formation of structural elements of steppe communities in the studied areas was determined. This work showed the usefulness of time series of satellite data on the NDVI (Normalized Difference Vegetation Index) obtained with the use of MODIS (Moderate Resolution Imaging Spectroradiometer) for the study of specific features of restored fallows. In general the biological parameters, projective cover, and phytomass determine the value of the NDVI. Interannual NDVI variability reflects the rate and time period of fallow restoration. From a certain point, the parameters increased and became close to the steppe (control variant). It has been revealed that not only abiotic factors (climate and soils), but also biotic parameters (grazing and recreational load) affect the NDVI. In this connection, the duration of restoration stages does not always correspond to the published data. They vary under different conditions. Climatic data of the Abakan meteorological station (index 29862 in the network of the World Meteorological Organization) for the period from 2000 to 2017 were statistically treated. The long-term annual average norms of temperatures and precipitation amounts (year and month) for the World Meteorological Organization base period of 1961–1990 were calculated. The dynamics of the temperature and precipitation, using long-term series of data, has been analyzed. © 2019, Pleiades Publishing, Inc.

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Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Division of Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Cherepnin Herbarium, Astaf’ev Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Botvich, I. Y.; Zorkina, T. M.

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10.

Effects of Macrobiota on the Transfer Efficiency of Essential Elements and Fatty Acids From Phytoplankton to Zooplankton Under Eutrophic Conditions / I. Y. Feniova, M. Karpowicz, M. I. Gladyshev [et al.] // Front. Environ. Sci. - 2021. - Vol. 9. - Ст. 739014, DOI 10.3389/fenvs.2021.739014. - Cited References:76. - This experiment was performed with support from the Polish National Science Centre (2016/21/B/NZ8/00434). The statistical analysis and its interpretation was performed with support from the Russian Science Foundation (Grant No. 21-14-00123). Biochemical analyses were performed with support by Federal Tasks for Institute of Biophysics SB RAS No. 51.1.1 and Federal Tasks for Siberian Federal University No. FSRG-2020-0019. The preparation of the manuscript by Feniova I. was supported by the Polish National Agency for Academic Exchange (Agreement No. PPN/ULM/2020/1/00258/U/DRAFT/00001). . - ISSN 2296-665X

РУБ Environmental Sciences
Рубрики:
FRESH-WATER ZOOPLANKTON
DAPHNIA-LONGISPINA
ZEBRA MUSSELS
Кл.слова (ненормированные):
fish -- zebra mussels -- nitrogen -- phosphorus -- food quality
Аннотация: The transfer pathways of organic matter and elements from phytoplankton to zooplankton in freshwater ecosystems are important for understanding how aquatic ecosystems function. We conducted a mesocosm experiment to determine how fish and zebra mussels altered the transfer efficiencies of essential substances including carbon (C), polyunsaturated fatty acids (PUFAs), total fatty acids (FAs), phosphorus (P), and nitrogen (N) from phytoplankton to zooplankton. We assessed the transfer efficiencies of the essential substances from phytoplankton to zooplankton as the ratio of their zooplankton production (P) per unit of biomass (B) to that of phytoplankton to exclude grazing or predation effects. We hypothesized that zebra mussels and fish would affect the transfer of materials from phytoplankton to zooplankton by altering the contents of essential elements and FAs in phytoplankton and zooplankton communities and/or due to shifts in the planktonic community structure mediated by grazing and/or predation. Fish increased the transfer efficiencies of eicosapentaenoic acid 20:5 omega-3 (EPA), docosahexaenoic acid 22:6 omega-3 (DHA), and P relative to the control. We speculated that fish weakened the control of zooplankton over algal assemblage by selectively feeding on larger cladocerans such as Daphnia. Therefore, fish can increase the relative proportion of high-quality food for zooplankton, improving food conditions for the available zooplankton. In contrast, zebra mussels reduced the transfer efficiencies of EPA and DHA relative to the control treatment likely due to competition with zooplankton for PUFA-rich food particles. However, zebra mussels did not have any impact on the transfer efficiencies of C, total FAs, N, and P. EPA, DHA, and P were transferred more efficiently than C from phytoplankton to zooplankton, while total FAs, which are commonly used as an energetic source, were transferred as efficiently as C. The enrichment of consumers with the most important substances relative to their basal food sources creates the potential for the successful transport of these substances across aquatic trophic webs.

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Держатели документа:
Russian Acad Sci, Inst Ecol & Evolut, Moscow, Russia.
Univ Bialystok, Fac Biol, Dept HydroBiol, Bialystok, Poland.
Russian Acad Sci, Inst Biophys Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Chair Aquat & Terr Ecosyst, Krasnoyarsk, Russia.
Russian Acad Sci, Papanin Inst Biol Inland Waters, Borok, Russia.
Oklahoma State Univ, Dept Integrat Biol, Stillwater, OK 74078 USA.

Доп.точки доступа:
Feniova, Irina Yu; Karpowicz, Maciej; Gladyshev, Michail I.; Sushchik, Nadezhda N.; Petrosyan, Varos G.; Sakharova, Ekaterina G.; Dzialowski, Andrew R.; Polish National Science Centre [2016/21/B/NZ8/00434]; Russian Science FoundationRussian Science Foundation (RSF) [21-14-00123]; Federal Tasks for Institute of Biophysics SB RAS [51.1.1]; Federal Tasks for Siberian Federal University [FSRG-2020-0019]; Polish National Agency for Academic ExchangePolish National Agency for Academic Exchange (NAWA) [PPN/ULM/2020/1/00258/U/DRAFT/00001]

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11.

The effect of salinity on the grazing rate and survival of Daphnia magna females adapted to different salinities / E. S. Zadereev, T. S. Lopatina, S. D. Ovchinnikov [et al.] // Aquat. Ecol. - 2022, DOI 10.1007/s10452-021-09941-7. - Cited References:47. - The reported study was funded by the Krasnoyarsk Regional Fund for supporting scientific and technical activities, the Krasnoyarsk Krai Government and the Russian Foundation for Basic Research, project number 19-44-240010. We are grateful to professional English translator Elena Krasova for language corrections. . - Article in press. - ISSN 1386-2588. - ISSN 1573-5125

РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
FEEDING-BEHAVIOR
PHYTOPLANKTON CONTROL
SPECIES COMPOSITION
Кл.слова (ненормированные):
Salinity -- Grazing -- Phytoplankton -- Adaptation -- Daphnia
Аннотация: The cladoceran Daphnia magna inhabits lakes with salinities up to 10 g L-1. We compared the effects of different salinities (up to 9 g L-1) on the survival, specific grazing rate, and size selective feeding of Daphnia females adapted to fresh or saline waters (3-4 g L-1). The freshwater population was more sensitive to high salinity (LC50 = 5.3 g L-1), while the survival of the saline water population also decreased in fresh water. Freshwater population demonstrated a higher grazing rate in fresh water, while the saline water population had a higher grazing rate at the salinity above 3 g L-1. A decrease in the grazing rate of the freshwater population was observed at the salinity above 4-5 g L-1. Populations differed in food selectivity. The saline water population consumed particles of larger sizes than the freshwater population. The average size of phytoplankton particles grazed in fresh water was larger than in saline water. This size selective salinity-dependent grazing may be related to the dependence of the feeding efficiency of cladocerans on the viscosity of water and size of phytoplankton particles. Our results indicate that Daphnia populations adapted to a certain salinity can temporarily lose the ability to control phytoplankton because of salinity fluctuations.

WOS
Держатели документа:
Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Inst Biophys, 50-50 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodniy Ave, Krasnoyarsk 660041, Russia.
Khakassky State Nat Reserve, POB 189, Abakan 655017, Russia.

Доп.точки доступа:
Zadereev, E. S.; Lopatina, T. S.; Ovchinnikov, S. D.; Oskina, N. A.; Drobotov, A., V; Tolomeev, A. P.; Krasnoyarsk Regional Fund; Krasnoyarsk Krai Government; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-44-240010]

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