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Abstract

The article focuses on the problem of structure degradation and ecosystem functioning – the urgency that identifies the relevance of operations at a strategic level aimed at providing the integrated assessment of ecological stability of water. Determination of water quality indicators were divided into blocks according to the criteria of salt composition, according to chemical saprobological indicators and the content of specific substances of toxic and radiation action. According to the results of block analysis, the integrated ecological index of water quality was determined by the dependence of water quali-ty on the indicators of ecological stabilization of the landscape and the structure of biotechnical elements. The article de-termines the relationships between worsening quality of surface waters and stabilization or destabilization of the landscape structure. The research was conducted on medium and large streamflows on the Right Bank of Polesie region of the Dnie-per-River cascade within which the tracts of land were identified and the landscape ecological stability (CESL1) and land-scape biotechnical elements coefficients (CESL2) were determined. The retrospective analysis was performed of the sur-face water features on the Right Bank of Polesie region of the Dnieper- River cascade and the main trends in salt block in-dicators, trophic and saprobiological block indicators, and in the content of toxic and radioactive substances at observation sites were estimated. Based on obtained data, the integrated assessment in trends of surface water quality on the Right Bank of Polesie region of the Dnieper- River cascade was made and the main parameters and scale of stabilization and destabili-zation of landscape impact on the water quality formation were defined.

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Authors and Affiliations

Tetyana P. Fedoniuk
Roman H. Fedoniuk
Ludmila D. Romanchuk
Anatolyy A. Petruk
Viktor M. Pazych
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Abstract

The research analyzed seasonal changes of the oxygen regime and related indicators on the example of water objects of the Ukrainian Polesie Region. The region shows different directions of economic use. Zebrafish ( Danio rerio Hamilton–Buchanan) and the Prussian carp ( Carassius auratus gibelio Bloch) were used as test objects to investigate survival responses. Dissolved oxygen (DO) concentration in water, pH values and temperatures were determined by standard methods. Based on research results, the main problems were determined pertaining to the oxygen regime of investigated waters, i.e. the increase in temperature and toxicity of the aquatic environment in the summer. A rather dangerous decrease in DO concentration, almost up to the levels of maximum allowable concentration (MAC) (4.10 mg∙dm–3 in group E1 and 6.07 mg∙dm–3 in group E2), was observed in August and it was typical for the reservoirs with a slow water movement. Flowing river waters (group E3) were eliminated due to their better aeration compared to other groups. The correlation analysis based on the presented data revealed a high and average degree of probable correlation between the DO concentration and water temperature, as well as an average degree of correlation with general toxicity determined on sensitive species of D. rerio, and in group E1 on the persistent species C. auratus gibelio as well. The interrelations and equations of the rectilinear regression can be used to predict the oxygen regime of the waters investigated and other surface waters having similar problems.
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Authors and Affiliations

Ella O. Aristarkhova
1
ORCID: ORCID
Tetiana P. Fedoniuk
2
ORCID: ORCID
Ludmila D. Romanchuk
1
ORCID: ORCID
Sergii V. Latushynskyi
1
ORCID: ORCID
Iryna V. Kot
1
ORCID: ORCID

  1. Polissia National University, Faculty of Forestry and Ecology, Zhytomyr, Ukraine
  2. Polissia National University, Educational and Scientific Center of Ecology and Environmental Protection, Staryi Blvd, 7, Zhytomyr, Zhytomyrs'ka oblast, 10008 Ukraine

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