Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact

The Dniester is one of the largest transboundary rivers of the Black Sea basin, and its lower reaches integrate the influence of climate change and hydropower plant (HPP) impact on the waterway. The decrease in precipitation and average annual air temperature increase and intensive hydroelectric con...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Svitlana Kovalyshyna, Tatiana Chuzhekova, Maria Grandova, Eduard Onishchenko, Elena Zubcov, Volodymyr Ukrainskyy, Oleksandr Goncharov, Oxana Munjiu, Mikhailo Nabokin, Antoaneta Ene
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hydropower impact dam big river river runoff nutrients metal pollution Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/048a24d504a04f9c808e8482cd85a24e
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:048a24d504a04f9c808e8482cd85a24e
record_format	dspace
spelling	oai:doaj.org-article:048a24d504a04f9c808e8482cd85a24e2021-11-11T15:00:13ZEcological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact10.3390/app112199002076-3417https://doaj.org/article/048a24d504a04f9c808e8482cd85a24e2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9900https://doaj.org/toc/2076-3417The Dniester is one of the largest transboundary rivers of the Black Sea basin, and its lower reaches integrate the influence of climate change and hydropower plant (HPP) impact on the waterway. The decrease in precipitation and average annual air temperature increase and intensive hydroelectric construction have led to a decline in the total water content of the river, during the last 10 years, being below the long-term historical “norm”. The shifts in the river flow result in multidirectional seasonal dynamics of nutrient concentrations. During the modern period, a stabilization of nutrient concentrations takes place, being lower than at the peak of eutrophication in the 1970s–1980s, but higher than in the natural flow period. The construction of reservoirs leads to a long-term decline in silica concentrations, continuing in the modern period. The concentration of heavy metals and metalloids in water and bottom sediments of the river generally corresponds to the ecological status of “Moderate”. Biological communities show a high β-diversity of microalgae, but low diversity of plankton and benthic invertebrates. Biological communities respond to the impact of HPP in both the short- and long-term. Hydroelectric dams change the bioavailability of nutrients downstream which, in the long-term, causes shifts in phytoplankton composition, especially the reduction of Bacillariophyta due to the lack of silicates that are deposited in reservoirs. However, in the short-term, after the discharge from the HPP dam, the concentration of silicates and the proportion of diatoms increase. Long-term changes also include a decline in the proportion of Rotifera and an increase in Copepoda in the total abundance of zooplankton and the unification of the benthic community with an increase in the biomass of gastropods in the area, which can be considered as indicators of the impact of hydroelectric power plants. The saprobity index, calculated both for zooplankton and macrozoobenthos, characterised the water as moderately polluted; benthic biotic indexes (Biological monitoring working party (BMWP), Belgian Biotic Index (BBI), Danish Stream Fauna Index (DSFI)) calculated on macrozoobenthos described the condition as “low” quality.Svitlana KovalyshynaTatiana ChuzhekovaMaria GrandovaEduard OnishchenkoElena ZubcovVolodymyr UkrainskyyOleksandr GoncharovOxana MunjiuMikhailo NabokinAntoaneta EneMDPI AGarticlehydropower impactdambig riverriver runoffnutrientsmetal pollutionTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9900, p 9900 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydropower impact dam big river river runoff nutrients metal pollution Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	hydropower impact dam big river river runoff nutrients metal pollution Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Svitlana Kovalyshyna Tatiana Chuzhekova Maria Grandova Eduard Onishchenko Elena Zubcov Volodymyr Ukrainskyy Oleksandr Goncharov Oxana Munjiu Mikhailo Nabokin Antoaneta Ene Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact
description	The Dniester is one of the largest transboundary rivers of the Black Sea basin, and its lower reaches integrate the influence of climate change and hydropower plant (HPP) impact on the waterway. The decrease in precipitation and average annual air temperature increase and intensive hydroelectric construction have led to a decline in the total water content of the river, during the last 10 years, being below the long-term historical “norm”. The shifts in the river flow result in multidirectional seasonal dynamics of nutrient concentrations. During the modern period, a stabilization of nutrient concentrations takes place, being lower than at the peak of eutrophication in the 1970s–1980s, but higher than in the natural flow period. The construction of reservoirs leads to a long-term decline in silica concentrations, continuing in the modern period. The concentration of heavy metals and metalloids in water and bottom sediments of the river generally corresponds to the ecological status of “Moderate”. Biological communities show a high β-diversity of microalgae, but low diversity of plankton and benthic invertebrates. Biological communities respond to the impact of HPP in both the short- and long-term. Hydroelectric dams change the bioavailability of nutrients downstream which, in the long-term, causes shifts in phytoplankton composition, especially the reduction of Bacillariophyta due to the lack of silicates that are deposited in reservoirs. However, in the short-term, after the discharge from the HPP dam, the concentration of silicates and the proportion of diatoms increase. Long-term changes also include a decline in the proportion of Rotifera and an increase in Copepoda in the total abundance of zooplankton and the unification of the benthic community with an increase in the biomass of gastropods in the area, which can be considered as indicators of the impact of hydroelectric power plants. The saprobity index, calculated both for zooplankton and macrozoobenthos, characterised the water as moderately polluted; benthic biotic indexes (Biological monitoring working party (BMWP), Belgian Biotic Index (BBI), Danish Stream Fauna Index (DSFI)) calculated on macrozoobenthos described the condition as “low” quality.
format	article
author	Svitlana Kovalyshyna Tatiana Chuzhekova Maria Grandova Eduard Onishchenko Elena Zubcov Volodymyr Ukrainskyy Oleksandr Goncharov Oxana Munjiu Mikhailo Nabokin Antoaneta Ene
author_facet	Svitlana Kovalyshyna Tatiana Chuzhekova Maria Grandova Eduard Onishchenko Elena Zubcov Volodymyr Ukrainskyy Oleksandr Goncharov Oxana Munjiu Mikhailo Nabokin Antoaneta Ene
author_sort	Svitlana Kovalyshyna
title	Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact
title_short	Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact
title_full	Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact
title_fullStr	Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact
title_full_unstemmed	Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact
title_sort	ecological conditions of the lower dniester and some indicators for assessment of the hydropower impact
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/048a24d504a04f9c808e8482cd85a24e
work_keys_str_mv	AT svitlanakovalyshyna ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT tatianachuzhekova ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT mariagrandova ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT eduardonishchenko ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT elenazubcov ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT volodymyrukrainskyy ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT oleksandrgoncharov ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT oxanamunjiu ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT mikhailonabokin ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact AT antoanetaene ecologicalconditionsofthelowerdniesterandsomeindicatorsforassessmentofthehydropowerimpact
_version_	1718437856900284416

Ecological Conditions of the Lower Dniester and Some Indicators for Assessment of the Hydropower Impact

Ejemplares similares