NEW FINDS OF NAKED FILOSE AND LOBOSE AMOEBAE IN FRESHWATER BODIES AND SOILS OF UKRAINE

Анотація

In the natural biotopes of Ukraine, 12 species of naked amoebae were identified, of which seven species are lobose and five are filose. The molecular cluster Amoebozoa includes seven species of amoebae, Opisthokonta includes two species, and Rhizaria includes three species. The following species were recorded: Leptomyxa spec., Chaos nobile Penard, 1902, Chaos carolinense Wilson, 1900, Deuteramoeba algonquinensis Baldock, Rogerson & Berger, 1983, Polychaos annulatum Penard, 1902, Saccamoeba limna Bovee, 1972, Trichamoeba sinuosa Siemensma & Page, 1986, Nuclearia simplex Cienkowski, 1865, Nuclearia radians Greeff, 1869, Filoreta spec., Leptophrys spec., Vernalophrys algivore Gong et al., 2015. All protist species were infrequently encountered (ranging from 1.5% to 24%), except for Leptomyxa spec. (30%). Naked lobose amoebae belong to polytactic (C. nobile, C. carolinense, D. algonquinensis, P. annulatum), monopodial (S. limna, T. sinuosa) and branched (Leptomyxa spec.) morphotypes. Water temperature and dissolved oxygen concentration were measured at the sites where naked amoebae species were recorded. Accordingly, N. simplex, P. annulatum were recorded at a water temperature of +13 °C, at 10.42 mg/l dissolved oxygen in water; N. radians, V. algivore – +17 °C, 9.35 mg/l; Leptophrys spec. – +15 °C, 9.74 mg/l; C. carolinense – +15 °C, 9.85 mg/l; C. nobile, D. algonquinensis – +16 °C, – 8.95 mg/l; S. limna – +12 °C, 10.50 mg/l; T. sinuosa – +15 °C, 9.65 mg/l. The values ​​of abiotic environmental factors at which soil amoebae species were recorded were established. Thus, Filoreta spec. and Leptomyxa spec. were found at soil temperatures of +12 °C and +10 °C and humidity levels of 90.34% and 94.45%, respectively. The filose amoeba Nuclearia simplex was identified through 18S rRNA gene sequencing (GenBank accession No. PV030488). This is the first report of these naked amoeba species in the fauna of Ukraine.