Species diversity of hydrobionts communities in Steblivske reservoir at the Ross river

V. V. Khomych

Abstract


Introduction. Korsun-Shevchenkivskyi reservoir is the lower  in reservoir cascade at the Ros river. It gets water around the upper watercourse of the river and, of course, carry the stream of the surface, industrial and domestic waste water. On the other side of the upper river sections  a significant number of fish and other hydrobionts organisms come to the said reservoir  during spring and autumn river bed washes.

The purpose of the study was to determine the species composition of hydrobionts of reservoir and its ecological state, such as hydrological, hydrochemical and hydrobiological regimes.

Methods. Research at Korsun-Shevchenkivskyi reservoir at Ros river was held in September 2013. Herewith the hydrochemical regime (16 indicators) and quality of the water environment, species composition, number and biomass of major groups of hydrobionts (phytoplankton, zooplankton, ichtiofauna and macrozoobenthos) have been reviewed. Sampling was done by 8 points.

Results. As result of studies it was  found that a significant impact on the hydrological and hydrochemical regimes is made by surface and ground water, the main components of which are hydrocarbons (329,4 mg / l). There are 53 species from six departments recorded in phytoplankton. Centric diatoms dominated by biomass - Stephanodiscus hantzschii and Aulacoseira granulata. Zooplankton includes 40 taxons out of three major taxonomic groups belonging to 35 taxons of the first order. Among them 25 taxons were rotifers (Rotatoria), 9 taxons - copepods (Copepoda) and 6 species - cladoceran (Cladocera). In macrozoobenthos species composition was found 39 species, including: flat (Turbellaria), round (Nematodes) and annelid worms (Oligochaeta, Hirudinea); crustaceans (Cladocera, Isopoda, Mysidacea) insects (Odonata, Ephemeroptera, Coleoptera, Diptera), mollusks (Gastropoda, Bivalvia). In ichtiofauna there were found 22 species of fish from 7 families. Maximum number of fish represented introduced by carp family Cyprinidae - 12 species (Leuciscus leuciscus, Rutilus rutilus, Scardinius erythrophthalmus, Alburnus alburnus, Leucaspius delineatus, Blissa bjoerkna, Abramis brama, Rhodeus amarus, Pseudorasbora parva, Gobio gobio, Carassius auratus, Tinca tinca). Perch Percidae contain 3 types of fish (Sander lucioperca, Perca fluviatilis, Gymnocephalus cernuus). For two species of fish have sharplings Gasterosteidae (Pungitius platygaster, Gasterosteus aculeatus) and gobiid Gobiidae (Neogobius fluviatilis, Proterorhinus marmoratus). One species - loaches Cobitidae (Cobitis taenia), pickerel Esocidae (Esox lucius) and loachgobies Odontobutidae (Perccottus glenii).

Conclusion. As a result of comprehensive research conducted at Korsun-Shevchenkivskyi reservoir at the Ros river in September 2013 it was found that the water quality meets the fisheries regulations. There were 53 species of six divisions recorded in phytoplankton, zooplankton includs 40 taxons of three major taxonomic groups, 39 species of invertebrate were found in species composition of macrozoobenthos, ichtiofauna is represented by 22 species of fish from 7 families.


Keywords


hydrochemical regime; phytoplankton; zooplankton; macrozoobenthos; ichtiofauna; Koropetskiy reservoir; Korsun-Shevchenkivskyi reservoir

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