THE ALGOFLORA OF THE PONDS OF DIUKOVSKYI PARK OF CITY ODESA

Abstract

Introduction. Microscopic algae play an important role in ecosystems of ponds. They create a primary organic matter, select oxygen, utilize carbon dioxide, inorganic and organic contamination in water and are a meal for numerous aquatic lives (infusoria, worms, crustaceas and fishes). Aim. The aim of the work was to study the current state of the algoflora of the ponds studied. Methods. The samples collected from November 2011 for August in 2020 on two ponds of Diukovskyi Park served as materials for the research. The samples were collected in phytoplankton, periphyton and microphytobenthos in spring, in summer and in autumn. On the whole 80 samples were collected and treated. The specific composition of algae was studied by the light microscope XSP-104. Results. The results of the research (2011-2020) of the specific composition of microscopic algae from 2 ponds of Diukovskyi Park of city Odesa were generalised. The species composition of the microphytes of Dukovskyi ponds included 67 species of algae, which belonged to 49 genera, 36 families, 21 orders, 9 classes, 7 divisions, 4 kingdoms and 2 empires. The number of species in the ponds was dominated by representatives of diatoms (38 species), blue-green (13), green (7) and khar (5). 13 species belonged to the empire of prokaryotes, 54 species – to eukaryotes. The kingdom of eubacteria is represented by 13, chromists ‒ 40, protozoa – 2, plants ‒ 12 species. Representatives of the leading genera Cosmarium Corda et Ralfs (5 species), Nitzschia Hassall (4) make up the algoflora of the ponds. For the first time, 14 new species of algae were registered for the ponds of Diukovskyi Park. The Sorensen-Chekanov similarity coefficient of the species composition of the algae ponds between the algoflores of Diukovskyi park and the arboretum named After Victory was 0.44, and Jakkar similarity ratio between them ‒ 0.29. In phytoplankton of ponds 20, periphyton ‒ 23 and microphytobentos ‒ 24 species were identified. By type of organization, single-celled forms were represented by 25, colonial - 33 and multicellular ‒ 6 species. Among them, there were 40 immobile, 27 taxa ‒ mobile. In accordance with the type of morphological differentiation of tallomas coccoid forms (50 taxa) dominated, filamentous constituted 6, capsal ‒ 6 and monad ‒ 4 species. The algoflora of the ponds of Diukovskyi Park is freshwater, alkaliphilic, mesosaprobic and cosmopolitan. Conclusions. The algoflora of two ponds of Diukovskyi Park consists of 67 species of microscopic algae, which belong to 7 divisions, 4 kingdoms and 2 empires. For the first time14 new species were identified for the ponds. The algoflora of ponds of Diukovskyi Park is freshwater, alkaliphilic, mesosaprobic and cosmopolitan.