A COMPREHENSIVE APPROACH TO THE ASSESSMENT OF HEAVY METALS POLLUTION IN ECOSYSTEMS OF SMALL RIVERS IN THE WESTERN PODILLIYA

V. O. Khomenchuk, N. О. Vovchek, V. Ya. Byyak, О. О. Rabchenyuk, V. Z. Kurant

Abstract


The metal content (Ferrum, Cobalt, Manganese, Zinc, Copper) in water, bottom sediments and tissues of freshwater fish (carp, crucian carp, pike, perch) from small rivers of Western Podillya (Seret, Strypa, Zolota Lypa) was studied. High concentrations have been found in the water and bottom sediments of the Ferrum and Manganese, which is probably due to the inflow of these metals from the bottom sediments in conditions of oxygen deficiency. The high content of mobile form of Ferrum, Cobalt, Manganese in the bottom sediments of the Zolota Lypa can lead to secondary pollution of the water column and pose a potential danger to aquatic organisms. Individual mechanisms of accumulation and distribution in the body of fish were established for different metals. Higher concentrations in the liver and gills of the studied fish species of Ferrum, Manganese and Zinc and significantly lower contents of Cobalt and Copper were observed. The metal content in fish tissues was characterized by high variability, had a pronounced tissue and species specificity. Correlation relations between metal content in water, bottom sediments and fish tissues from small rivers of Western Podillia are analyzed. Positive correlations have been established between the content of the gross form of Ferrum in the bottom sediments, in the gills of crucian carp, perch and pike and the liver of perch and pike. The amount of Manganese in the water correlated with the metal content in the gills of carp and pike. The increase in the amount of Zinc in the bottom sediments (gross form) led to its accumulation in the gills of all fish species, as well as in the liver of perch and pike, as evidenced by the high positive values of Pearson's coefficients (0.71-0.91). The Copper content in water and bottom sediments (gross form) correlated with their amount in the liver of perch and pike, which may serve as a bioindication of pollution of aquatic ecosystems by this metal.

Keywords


small rivers; bottom sediments; heavy metals; fish; correlation analysis

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DOI: https://doi.org/10.25128/2078-2357.21.4.7

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