Changes in phytoplankton diversity in the Volga Basin waterbodies

Korneva, L. G.

doi:10.1134/s1995082910040048

Cited by 14 publications

(30 citation statements)

References 3 publications

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“…The same trend was noted in 1989-1991 [43] and has not changed over a quarter of a century. A similar distribution is also observed for the phytoplankton biomass [8]. The explanation is the increase in flow velocity and volume of runoff downstream the Volga, as well as a decrease in the volume of lateral tributaries.…”

Section: Chlorophyll Distribution and Dynamicssupporting

confidence: 73%

“…In late May-early June, the Chl content becomes below 10 μg/L and remains low for 2-4 weeks. During this there is a seasonal change of phytoplankton communities [8]. The summer maximum, at which Chl can exceed 100 μg/L in some parts of the water area, covers a long period in July-September.…”

Section: Seasonal Dynamics Of Chlorophyllmentioning

confidence: 99%

“…The course of seasonal succession of phytoplankton in such an environment is subject to frequent disturbing external influences [57][58][59], which include wind mixing [60,61], and in the reservoirs also the operation of hydraulic structures. Diatom algae dominate the phytoplankton of the reservoir in spring and autumn [8]. The diatom maximum during these periods is usually observed in water bodies of the temperate zone [56,57].…”

Section: Seasonal Dynamics Of Chlorophyllmentioning

confidence: 99%

“…Climate is an important driver of the distributional patterns of individual hydrobionts that may cause changes in community composition [5]. An increase in temperature is considered as eutrophication factor that changes the availability of nutrients, promotes an increase in the internal phosphorus load, and also stimulates abundant and prolonged vegetation of cyanoprokaryotes (blue-green algae) that are the causative agents of water bloom [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Chlorophyll and Its Role in Freshwater Ecosystem on the Example of the Volga River Reservoirs

Mineeva¹

2022

Chlorophylls

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The present chapter has the aim to considerate the most significant aspects of chlorophyll (Chl) applications in the ecological study of fresh waters on the example of the Volga River reservoirs. Throughout the cascade of seven large reservoirs, Chl varied in wide range from 2.5–9 to over 100 μg/L with mean values of 16.5–41.2, 6.7–44.0, and 3.6–10.6 μg/L in the Upper, Middle, and Lower Volga, respectively. Mean Chl values that constantly decrease from the Upper Volga to Lower Volga, characterize Ivankovo, Uglich, and Cheboksary reservoirs as eutrophic, Saratov and Volgograd reservoirs as mesotrophic, while Gorky and Kuibyshev reservoirs in some years are mesotrophic or eutrophic. Chl seasonal dynamics in the Rybinsk reservoir that is dynamics of phytoplankton biomass, is characterized by spring, summer, and, in some years, autumn maxima. Water temperature and water regime of the reservoir are the main factors in Chl dynamics. Years with low-water conditions are favorable for the high Chl concentrations and intensive development of algae. Seasonally average Chl that make from 5 to 22 μg/L during 1969–2019, show variations in trophic state of reservoir from mesotrophic (Chl < 10 μg/L), to moderately eutrophic (10–15 μg/L), and eutrophic (15–22 μg/L).

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Section: Chlorophyll Distribution and Dynamicssupporting

confidence: 73%

Section: Seasonal Dynamics Of Chlorophyllmentioning

confidence: 99%

Section: Seasonal Dynamics Of Chlorophyllmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chlorophyll and Its Role in Freshwater Ecosystem on the Example of the Volga River Reservoirs

Mineeva¹

2022

Chlorophylls

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“…A reduction in the prevalence of taxa such as Mougeotia (a filamentous algae) and Peridinium (a dinoflagellate) resulted in a concomitant increase of biovolume diversity and a decrease of total phytoplankton biovolume. Such negative links between diversity and productivity, due to the dominance of some taxa, are not very frequent but have been reported in temperate lakes [34,41,43,50]. Previous observational studies about the importance of biodiversity for ecosystem functioning in freshwater ecosystems have led to the belief that phytoplankton diversity has a general positive impact on productivity [23].…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton Diversity Relates Negatively with Productivity in Tropical High-Altitude Lakes from Southern Ecuador

et al. 2019

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Tropical high-altitude lakes are vital freshwater reservoirs in the Andean regions. They are heavily threatened by human activities that may alter their functioning and hamper the provisioning of key ecosystem services such as water supply. Despite their ecological and social relevance, we know little about these waterbodies, especially regarding the factors influencing their functioning. Here, we explored the links between several environmental variables and phytoplankton productivity, measured as chlorophyll-a concentration and total phytoplankton biovolume. For this, we sampled twenty-four tropical high-altitude lakes located over three-thousand meters above sea level in Southern Ecuador. We found that four abiotic factors combined explained 76% of the variation in chlorophyll-a concentration amongst lakes. Contrary to what studies from temperate regions suggest, taxa richness was not related to either chlorophyll-a concentrations or total phytoplankton biovolume. Moreover, phytoplankton biovolume diversity was negatively correlated to both chlorophyll-a concentrations and total phytoplankton biovolume. This was due to a very uneven distribution of productivity amongst taxa in the more productive lakes. To the best of our knowledge, this is the first attempt to explore the determinants of phytoplankton functioning in tropical high-altitude lakes. We hope that this study will help to establish a baseline for evaluating the consequences of human activities in the ecology and functioning of this vital but fragile ecosystem. Our results suggest that by modifying the abiotic and biotic parameters of tropical high-altitude lakes, human activities can indirectly impact their functioning and their capacity to provide vital ecosystem services.

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Influence of natural factors and human impact on water quality in the river Kudma – small tributary of the Cheboksary reservoir

Erina

Vilimovich

Соколов

et al. 2019

IOP Conf. Ser.: Earth Environ. Sci.

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In this paper we present the results of water quality studies in the Kudma River – a small tributary of the Cheboksary reservoir (Middle Volga). The water quality of the river is formed under the influence of karst processes, widespread in its catchment area, as well as heavily polluted wastewater discharge from municipal sewer systems without nutrient removal facilities. Geological features of the catchment cause a significant increase in total dissolved solids and changes in the major ions content from the headwaters to the confluence with the Volga. At the same time, there is a rapid increase in the phosphorus and especially nitrogen content in the water below the places of domestic sewage release into the river. As a result, the Kudma River contributes to the nutrient pollution of the Cheboksary reservoir – one of the most eutrophic lakes in the Volga basin.

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Changes in phytoplankton diversity in the Volga Basin waterbodies

Cited by 14 publications

References 3 publications

Chlorophyll and Its Role in Freshwater Ecosystem on the Example of the Volga River Reservoirs

Chlorophyll and Its Role in Freshwater Ecosystem on the Example of the Volga River Reservoirs

Phytoplankton Diversity Relates Negatively with Productivity in Tropical High-Altitude Lakes from Southern Ecuador

Influence of natural factors and human impact on water quality in the river Kudma – small tributary of the Cheboksary reservoir

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