Morphotypes in Naked Amoebas (Protista): Distribution in Water Bodies of Zhytomyr and Volyn Polissia (Ukraine) and Possible Ecological Significance

Th e biotopic and seasonal distributions of the naked amoeba species related to the specifi c morphotypes were analyzed on the territory of Zhytomyr and Volyn Polissya. It was demonstrated that the polytactic and, to some extent, rugose and branched morphotypes of naked amoebas have the adaptive signifi cance and could have emerged as a result of adaptation to characteristic conditions of oligotrophic lakes. In turn, the formation of lanceolate morphotype may be associated with the adaptation to low water temperatures, whereas the formation of fl amellian morphotype may be an adaptation to high temperatures

New finds of naked amoebae

Findings of naked amoebae in various habitats of Ukraine and other territories are presented. Saccamoeba sp., Thecamoeba similis (Greeff, 1891) Lepşi, 1960, Vexillifera bacillipedes Page, 1969, Vannella lata Page, 1988, Acanthamoeba sp., Willaertia magna De Jonckheere, Dive, Pussard & Vickerman, 1984 were identified based on morphological data and molecular genetic research methods. All these species of amoebae are characterized according to our own observations and measurements and the published data. The amoebae we found belong to three classes (Tubulinea, Discosea, Heterolobosea), six orders (Euamoebida, Thecamoebida, Dactylopodida, Vannellida, Centramoebida, Schizopyrenida), six families (Hartmannellidae, Thecamoebidae, Vexilliferidae, Vannellidae, Acanthamoebidae, Vahlkampfiidae) and six genera (Saccamoeba, Thecamoeba, Vexillifera, Vannella, Acanthamoeba, Willaertia). W. magna was the least common in water bodies of different regions of Ukraine; Saccamoeba sp., V. bacillipedes in the studied water bodies are either uncommon species or occupy the middle position in terms of frequency of occurrence In the water bodies of Ukraine T. similis, V. lata, Acanthamoeba sp. are both the least common and the most common species, or occupy the middle position in terms of frequency of occurrence. The following ecological groups of naked amoebae have been identified in relation to temperature: eurythermal, psychrophilic stenothermal, thermophilic stenothermal. In relation to the concentration of dissolved oxygen in water: euryoxidic and stenooxidic. Three species of amoebae can withstand either a wide range of values of organic substances dissolved in water, or belong to stenobiont species. The recorded amoebae belong to monotactic (Saccamoeba sp.), striate (T. similis), dactylopodial (V. bacillipedes), fan-shaped (V. lata), acanthopodial (Acanthamoeba sp.) and eruptive (W. magna) morphotypes

The Taxonomical Composition of Naked Amoebas in the Lakes of Shatsk.

Уперше наведено інформацію про таксономічний склад голих амеб Шацьких озер. У результаті першого цілеспрямованого дослідження голих амеб Шацьких озер ідентифіковано 19 видів. The information on the taxonomical composition of naked amoebas of lakes of Shatsk has been adduced at the first time in the article. 19 species of amoebas was identified resulting object-orientated investigation.Роботу виконано на кафедрі ботаніки ЖДУ ім. Івана Франка та в Інституті зоології ім. І. І. Шмальгаузена НАН Україн

Naked Amoebas of the Lakes of Shatsk

Для шести знайдених видів голих амеб складено морфологічні нариси та диференційні діагнози з врахуванням їхньої локомоторної та флотуючої форми, а також їхніх морфотипів. Згідно з сучасною системою голих амеб описані види в регіоні дослідження представлені двома класами – Tubulinea, Discosea, трьома рядами – Euamoebida, Leptomyxida, Dermamoebida і трьома родинами – Hartmannellidae, Leptomyxidae, Mayorellidae. Найбільшим видовим багатством представлена родина Mayorellidae – трьома видами (Mayorella vespertilioides Page, 1983, Mayorella penardi Page, 1972, Mayorella sp. (1)). До родини Hartmannellidae належить два види голих амеб – Saccamoeba wakulla Bovee, 1972, Saccamoeba sp. (3), до родини Leptomyxidae – один вид Rhizamoeba sp. (2). Крім того, за нашими даними, у Шацьких озерах зареєстровано голі амеби, що належать до трьох морфотипів: монотактичного, розгалуженого (сітчастого) і майорельного. The morphological notes and differential diagnoses of 6 naked amoeba species are given including the data on their locomotion and floating forms and also morphotype analyses. According to the modern system of naked amoeba the two classes are presented in investigated region: Tubulinea and Discosea; including three orders – Euamoebida, Leptomyxida and Dermamoebida and three families - Hartmannellidae, Leptomyxidae and Mayorellidae. The highest species richness is characteristic for the family Mayorellidae in the lakes (three species − Mayorella vespertilioides Page, 1983, Mayorella penardi Page, 1972 and Mayorella sp. (1)). The two naked amoeba species − Saccamoeba wakulla Bovee, 1972 and Saccamoeba sp. (3) are belong to the family Hartmannellidae whereas only one species (Rhizamoeba sp. (2) to the family Leptomyxidae. In addition due to our data the naked amoeba species which observed in the Lakes of Shatsk are belong to the three morphotypes: monotactic, branched and mayorellian.Роботу виконано на кафедрі ботаніки, біоресурсів та збереження біорізноманіття ЖДУ ім. І. Франк

Diversity and distribution of naked amoebae in water bodies of Sumy region (Ukraine)

Taxonomy of naked amoebae and specifi cs of their distribution in water bodies of Sumy Region are presented. Our research identifi ed 12 species of naked amoebae of 11 morphotypes. We established their ecological groups relative to abiotic aquatic factors: euryoxidic, stenooxidic, stenobiotic and those that survive in a wide range of organic matter content. According to the species composition, swamp and riparian species complexes of naked amoebae were identifi ed. It was found that species complexes of amoeba are infl uenced by such factors as temperature, concentration of dissolved oxygen and organic compounds

Species of naked amoebae (Protista) new for the fauna of Ukraine

Th e species Rhzamoeba sp., Th ecamoeba quadrilineata Carter, 1856, Th ecamoeba verrucosa Ehrenberg, 1838, Flamella sp., and Penardia mutabilis Cash, 1904 are fi rst reported in the fauna of Ukraine and described based on original materia