Long-Term Dynamics of the Macrozoobenthos and Plant Pigments in Bottom Sediments of Rybinsk Reservoir

2020 ◽  
Vol 47 (1) ◽  
pp. 80-86
Author(s):  
L. E. Sigareva ◽  
S. N. Perova ◽  
N. A. Timofeeva
Keyword(s):  
Bottom Sediments ◽  
Rybinsk Reservoir ◽  
Plant Pigments

Danube Field Excursion 1988: Tritium Content of River Water; Radioactivity of Danube Sediments

1990 ◽  
Vol 22 (5) ◽  
pp. 203-210 ◽  
Author(s):  
D. Rank ◽  
F. J. Maringer ◽  
W. Papesch ◽  
V. Rajner
Keyword(s):  
River Water ◽  
Bottom Sediments ◽  
Nuclear Power ◽  
Radioactive Material ◽  
Reactor Accident ◽  
Tritium Content ◽  
Fine Sediments ◽  
Fish Samples ◽  
Field Excursion

Water, sediment, and fish samples were collected during the Danube excursion 1988, within a coordinated sampling program of the Radiology Working Group of the “Internationale Arbeitsgemeinschaft Donauforschung ” (K.Hübel, Munich; I. Kurcz, Budapest; D.Rank, Vienna). The H-3 content of the river water and the radioactivity of the bottom sediments were measured at the BVFA Arsenal, Vienna. The determined H-3 content of the Danube water corresponds with the long-term trend in the H-3 content of the hydrosphere; the values lie in the range of 3 Bq/kg downstream from Belgrade, upstream from Belgrade they are about 4 Bq/kg. It was only in the waste water plume of the nuclear power station of Kozloduj that a slightly elevated H-3 value - 6 Bq/kg - was determined. The content of the sediments of artificial radionuclides was found, at the time of the Danube field excursion, to be almost exclusively due to the radioactive material released following the reactor accident at Chernobyl in April 1986 (mainly Cs-137 and Cs-134). As a consequence of the air currents and precipitation conditions prevailing at the time of the accident, the bottom sediments in the lower course of the Danube were less contaminated than those in the upper course. The fine sediments were found to contain over 3000 Bq/kg of Cs-137 in the upper course of the Danube.

Plant Pigments in Water and Bottom Sediments of the Tsimlyansk Reservoir

2020 ◽  
Vol 13 (3) ◽  
pp. 408-416
Author(s):  
N. M. Mineeva ◽  
L. E. Sigareva ◽  
N. A. Timofeeva ◽  
I. V. Semadeny
Keyword(s):  
Bottom Sediments ◽  
Plant Pigments ◽  
Tsimlyansk Reservoir

Lake Maggiore (N. Italy) trophic history: fossil diatom, plant pigments, and chironomids, and comparison with long-term limnological data

2004 ◽  
Vol 113 (1) ◽  
pp. 97-110 ◽  
Author(s):  
Aldo Marchetto ◽  
Andrea Lami ◽  
Simona Musazzi ◽  
Julieta Massaferro ◽  
Leonardo Langone ◽  
...  
Keyword(s):  
Plant Pigments ◽  
Lake Maggiore

scholarly journals Reconstruction of the Long-Term Dynamics of Particulate Concentrations and Solid–Liquid Distribution of Radiocesium in Three Severely Contaminated Water Bodies of the Chernobyl Exclusion Zone Based on Current Depth Distribution in Bottom Sediments

Land ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 29
Author(s):  
Alexei Konoplev ◽  
Gennady Laptev ◽  
Yasunori Igarashi ◽  
Hrigoryi Derkach ◽  
Valentin Protsak ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Sediment Cores ◽  
Temporal Trends ◽  
Water Bodies ◽  
Contaminated Water ◽  
Exclusion Zone ◽  
Liquid Distribution ◽  
Diffusional Model ◽  
Solid Liquid

Given the importance of understanding long-term dynamics of radionuclides in the environment in general, and major gaps in the knowledge of 137Cs particulate forms in Chernobyl exclusion zone water bodies, three heavily contaminated water bodies (Lakes Glubokoe, Azbuchin, and Chernobyl NPP Cooling Pond) were studied to reconstruct time changes in particulate concentrations of 137Cs and its apparent distribution coefficient Kd, based on 137Cs depth distributions in bottom sediments. Bottom sediment cores collected from deep-water sites of the above water bodies were sliced into 2 cm layers to obtain 137Cs vertical profile. Assuming negligible sediment mixing and allowing for 137Cs strong binding to sediment, each layer of the core was attributed to a specific year of profile formation. Using this method, temporal trends for particulate 137Cs concentrations in the studied water bodies were derived for the first time and they were generally consistent with the semiempirical diffusional model. Based on the back-calculated particulate 137Cs concentrations, and the available long-term monitoring data for dissolved 137Cs, the dynamics of 137Cs solid–liquid distribution were reconstructed. Importantly, just a single sediment core collected from a lake or pond many years after a nuclear accident seems to be sufficient to retrieve long-term dynamics of contamination.

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.

Preliminary Assessment of the Impact of Draining of Iraqi Marshes on Kuwait's Northern Marine Environment. Part II. Sediment Associated Pollutants

1999 ◽  
Vol 40 (7) ◽  
pp. 89-98 ◽  
Author(s):  
Talat Saeed ◽  
A. N. Al-Ghadban ◽  
H. Al-Shemmari ◽  
M. Al-Mutairi ◽  
H. Al-Hashash
Keyword(s):  
Marine Environment ◽  
Bottom Sediments ◽  
Negative Impact ◽  
Preliminary Assessment ◽  
Chlorinated Pesticides ◽  
Marine Area ◽  
Northern Area ◽  
Recent Origin ◽  
The Impact

Kuwait's northern marine area is considered to be the receiving basin for the influx of sediments and associated pollutants from the Shatt Al-Arb estuary. In recent years, Iraq has undertaken to drain the southern marshes, which acted as a sink for the associated pollutants. This loss of marshes is expected to have far reaching consequences on the ecology of the northern Gulf. Bottom sediments from the area likely to be impacted by the draining of the marshes were studied for a variety of parameters. The results showed that petroleum-related pollutants (Ni, V, TPH, PAH and n-alkanes) were, generally, much higher in the southern part of the study area which may be due to the tanker traffic. Spotty higher levels of petroleum were encountered in the northern area, which were of recent origin and may have been the result of the draining of marshes. Chlorinated pesticides and PCBs were not detected in any of the samples. In general, there were indications of the negative impact of the draining of the marshes, however, long-term and more detailed studies are needed.

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.

Analysis of Rybinsk and Ivankovo reservoirs diatom complexes and phytoplankton associations long-term transformations

2019 ◽  
pp. 83-86
Author(s):  
Lev V. Razumovsky ◽  
Vikenty L. Razumovsky
Keyword(s):  
Bottom Sediments ◽  
Methodological Approach ◽  
Graphical Analysis ◽  
Comprehensive Analysis ◽  
Diatom Complexes

As a result of monitoring, a unified methodological approach was formulared for the ecosystems of the Ivankovsky and Rybinsk reservoirs, with comprehensive analysis of phytoplankton associations and diatom complexes from bottom sediments. In addition to traditional forms of hydrobiological analysis, the author's method of graphical analysis was applied.

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