scholarly journals Long-term dynamics of photosynthetic pigments in plankton of a large plains reservoir

2021 ◽  
Vol 29 (1) ◽  
pp. 10-16
Author(s):  
N. M. Mineeva
Keyword(s):  
Chlorophyll Content ◽  
Water Regime ◽  
Trophic Status ◽  
Rybinsk Reservoir ◽  
Negative Relationship ◽  
Light Conditions ◽  
Biological Communities ◽  
Stable Temperature ◽  
The Rybinsk Reservoir

Long-term observations are necessary to analyze and predict changes occurring in biological communities under global and regional climatic changes. The data on seasonal and long-term dynamics of chlorophyll in plankton of the Rybinsk Reservoir (Upper Volga, Russia) obtained in May – October 2009–2019 at six standard stations using the fluorescence method are presented. In the years with contrasting hydroclimatic conditions and water regime, the chlorophyll content varied from 1–3 to >100 μg/L. The significant variability of mean seasonal values (7.9 ± 0.5 μg/L in 2009 to 27.6 ± 1.7 μg/L in 2013 with variation coefficients of 52–134%) indicates the low resistance of the community. The total chlorophyll content is associated with the development of three main phytoplankton divisions i.e., diatoms, cyanoprokaryots, and green algae. The trophic status of the reservoir was characterized as mesotrophic in 2009 and 2017, eutrophic in 2011–2014, and moderately eutrophic in other years. In the long-term seasonal cycle of phytoplankton, there are five periods with stable temperature conditions and transparency, but variable chlorophyll content. A moderate positive relationship was found between the seasonal dynamics of chlorophyll and water temperature, but a moderate negative relationship with transparency. The priority factors regulating the long-term dynamics of chlorophyll include the NAO indices, Wolf numbers, temperature, and underwater light conditions, as well as the inflow volume and water level. Water regime limits the development of phytoplankton.

SEASONAL AND INTERANNUAL DYNAMICS OF CHLOROPHYLL IN PLANKTON OF THE RYBINSK RESERVOIR (2015–2019)

2021 ◽  
pp. 11-27
Author(s):  
N. Mineeva
Keyword(s):  
Seasonal Variation ◽  
Trophic Status ◽  
Rybinsk Reservoir ◽  
Growing Season ◽  
Average Content ◽  
Fluorescent Method ◽  
Seasonal And Interannual Dynamics ◽  
Interannual Dynamics ◽  
The Rybinsk Reservoir

New data on chlorophyll content at standard stations in the Rybinsk reservoir, that continue series of long-term observations, were obtained in May–October 2015–2019. A fluorescent method is used in this study which makes it possible to determine the total amount of chlorophyll (ΣChl) by its content in cyanoprokaryotes, di-atoms, and green algae (ChlCyan, ChlBac, ChlChl, respectively). These taxa are the main contributors to ƩChl which show interannual and seasonal variation. In different years, the average content of ChlBac makes 2.4–6.6 μg/L or 24–50% of the ΣChl pool, ChlCyan – 3.1–10.9 μg/L (50–70%), ChlChl – 0.3–1.2 μg/L (3–12%). The distribution of ChlBac in the water column is generally uniform while the amount of ChlCyan decreases with depth. With the average ΣChl content for the growing season 14.8±1.0, 13.0±1.3, 7.8±0.6, 13.6±1.6, and 11.9±1.0 μg/L in 2015–2019, the trophic status of the reservoir varied from moderately eutrophic to mesotrophic.

scholarly journals The State and Dynamics of Biological Communities in the Rybinsk Reservoir under Climate Changes

2018 ◽  
pp. 1-20
Author(s):  
Ludmila G. Korneva ◽  
◽  
Valentina I. Lazareva ◽  
Natalia M. Mineeva ◽  
Lubov E. Sigareva ◽  
...  
Keyword(s):  
Climate Changes ◽  
Rybinsk Reservoir ◽  
The State ◽  
Biological Communities ◽  
The Rybinsk Reservoir

Ecology and metabolic activity of cyanobacteria in large different types of lowland reservoirs in the European part of Russia

2021 ◽  
pp. 29-37
Author(s):  
Lyudmila G. Korneva ◽  
Vera V. Solovyova ◽  
Sergey I. Sidelev ◽  
Ekaterina N. Chernova ◽  
Yana V. Russkich
Keyword(s):  
Rybinsk Reservoir ◽  
Pcr Analysis ◽  
European Part Of Russia ◽  
Lowland Reservoirs ◽  
Volga Reservoirs ◽  
Abundance And Diversity ◽  
Long Term Trend ◽  
Geographical Characteristics ◽  
The Rybinsk Reservoir

A comparative of the species composition and ecological-geographical characteristics of cyanobacteria plankton of 13 reservoirs of the Volga-Kama cascade and the Don (Sheksna, Ivankovo, Uglich, Rybinsk, Gorky, Cheboksary, Kuibyshev, Saratov, Volgograd, Kama, Votkinsk, Nizhnekamsk and Tsimlyansk reservoirs) is analysed. An assessment of the change in the distribution of cyanobacteria biomass in a latitudinal gradient along the Volga cascade is presented. The seasonal and long-term (1954–2016) dynamics of the abundance, biomass and the ratio of functional groups of cyanobacteria in the Rybinsk Reservoir, the second largest in the cascade of Volga reservoirs, are analyzed. A positive long-term trend of abundance and diversity of cyanobacteria and the leveling of their biomass between reservoirs along a cascade in recent years has been established. An increase in the abundance and diversity of nonheterocystous species was established in the direction from the Upper to the Lower Volga and during the long-term succession of phytoplankton of the Rybinsk Reservoir. This is associated with an increase of water mineralization. Based on current research in the 2010s of the Volga, Kama and Don cascade reservoirs, 14 variants of microcystin structures were identified, the diversity of which depended on the composition of the producing species. Using PCR analysis, the main producers of microcystins (Microcystis and Dolichospermum) were identified. Cyanobacteria Cuspidothrix issatschenkoi and/or Raphidiopsis mediterranea have been identified as possible producers of neurotoxic anatoxin-a in the Tsimlyansk Reservoir. It was shown that water temperature and nitrogen were the greatest importance for development of microcystin-producing species of cyanobacteria.

scholarly journals Long-Term Dynamics of Chlorophyll in Plankton of Different Sites in a Large Plain Reservoir

2021 ◽  
Vol 14 (6) ◽  
pp. 679-690
Author(s):  
N. M. Mineeva
Keyword(s):  
Seasonal Dynamics ◽  
Rybinsk Reservoir ◽  
Growing Season ◽  
Close Correlation ◽  
High Water ◽  
Hydrological Structure ◽  
Spatial Differences ◽  
Average Water ◽  
The Rybinsk Reservoir

Abstract On the basis of field observations in 2009–2019, the seasonal and long-term dynamics of chlorophyll at six standard stations of the Rybinsk Reservoir is considered. The fluorescence method is used to determine chlorophyll. The average chlorophyll content at stations varies from the minimum 3.5–10.8 to the maximum 16.9–40.5 μg/L in different years and from 12.0 at station 5 (Sredny Dvor) up to 21.6 μg/L at station 2 (Mologa) on average for the entire period. The seasonal dynamics of chlorophyll is characterized by spring; summer; and, in some years, autumn maxima. With the same type of seasonal dynamics, the change in chlorophyll at the stations is to varying degrees coupled in the years of observation and is most often correlated in neighboring areas. Significant differences in the amount of chlorophyll at the stations are observed during surveys carried out within one day and are determined by the complex hydrological structure of the reservoir; active dynamic processes; and, in the spring, by the thermal regime. The presence of stable large circulation zones smoothes out the spatial differences of chlorophyll, the average seasonal concentrations of which do not differ significantly at all six stations in years with an average water level, and at four stations of the Main Reach in extremely high-water years. A close correlation in long-term dynamics is revealed for the average chlorophyll concentrations for the growing season at six stations, as well as at each station and the reservoir as a whole. The results of the work confirm the reliability of the data obtained for assessing the ecological state of the Rybinsk Reservoir.

scholarly journals Long-term dynamics of the water quality in the Rybinsk reservoir according to biotesting

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Roza A. Lozhkina ◽  
Irina I. Tomilina
Keyword(s):  
Water Quality ◽  
Chemical Composition ◽  
Industrial Wastewater ◽  
Agricultural Land ◽  
Rybinsk Reservoir ◽  
Aquatic Toxicity ◽  
Chemical Composition Of Water ◽  
The Rybinsk Reservoir

Long-term dynamics of the aquatic toxicity was studied in the Rybinsk Reservoir. According to the biotesting, the Volga and Sheksna reaches were the most polluted areas, which were exposed to household and industrial wastewater, as well as to the diffuse runoff from agricultural land and major highways. The relationships between the parameters of toxicity and indicators of the chemical composition of water were analyzed.

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