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S. Shevchuk and I. Dovgal

Ecological Spectrums of Heterotrophic Flagellates (Protista) in Water Bodies of Ukrainian Polissya Area

Dependence of 26 heterotrophic flagellate species development in central part of Ukrainian Polissya area from operating pH and concentrations of dissolved organic matter and oxygen in the waters is considered. Narrowing of existence spectrums in certain types of water body characteristic for some species of heterotrophic flagellates is stated; this peculiarity is strongly expressed in the bogs where specific complex of hydrochemical conditions to have a place.

Open access

L. Gaponova and I. Dovgal

The Variability of Exoskeleton Elements in Polyplacocystis Ambigua (Protista, Centrohelida)

The Variability of Exoskeleton Elements in Polyplacocystis ambigua (Protista, Centrohelida). Gaponova L. P., Dovgal I. V. — Article dealt with the investigation of variability of the scales of periplast in Polyplacocystis ambigua (Penard, 1904). New quantative character of periplast scale (wide of rim) was introduced. Renewed diagnosis of P. ambigua where the quantative characteristics of perilpast scales are taken into account is given.

Open access

M. Patcyuk and I. Dovgal

Biotopic Distribution of Naked Amoebas (Protista) in Ukrainian Polissya Area

Forty-one species of naked amoebas were found in the different types of waterbodies of Zhytomyr and Volyn' parts of Ukrainian Polissya region. The major part of species of naked amoebas in this region demonstrated the prevalence to living in a certain type of water body that possible depends on the hydrochemical and trophic parameters of water. The limnetic and floodplain species complexes of amoebas are distinguished in Ukrainian Polissya.

Open access

I. V. Dovgal and R. Mayén-Estrada

Comparative analysis of Dendrocometes paradoxus Stein, 1852 cell morphology from various gammarid amphipod species in different regions of Ukraine, and those attached to several host body parts of Hyalella azteca collected in two Mexican lakes, was carried out in order to demonstrate the morphological variability, due to the hosts species or their geographical distribution. For hosts species and corporal distribution, no significant differences between the two populations were shown. As the result, it was found the suctorians common for amphipod crustaceans from Ukraine and Mexico all are conspecific and belong to D. paradoxus.

Open access

I. Dovgal, A. Zawal and V. Pešić

New Finds of Tokophrya Wenzeli (Ciliophora, Suctorea), a Commensal of Water Mites (Acari, Hydrachnidia), and the Redescription of the Species

The article deals with investigations of suctorian species Tokophrya wenzeli Matthes et Stiebler, 1970 which was observed in waterbodies of Ukraine, Poland and Macedonia. New observations permit to precise the morphology of tentacles and show the variability of such sufficient characters of the species as morphology of basal plate, stalk and actinophores. The redescription of the species is also presented.

Open access

V. Anistratenko, I. Dovgal and N. Filimonova

Open access

S. S. Kramarenko and I. V. Dovgal

Abstract

Spatial Variation of the Land Snail Brephulopsis cylindrica (Gastropoda, Pulmonata, Enidae): a Fractal Approach. Kramarenko, S. S., Dovgal, I. V. - Th e results of investigations of intrapopulation patterns in the land snail Brephulopsis cylindrica (Menke, 1828) variation are discussed in the article. Th e self-similar intrapopulational groups (demes) with sets of random (chaotic) and ranked (clinal) patterns of morphological characters were observed. It is argued that the self-similar elements lead to the formation of spatial variability patterns with distinct fractal nature. Thus the relative roles both of the random and the regular components can be detected for separate characters according to the degrees of nearness or remoteness of fractal dimension to 2.0.

Open access

R. Marico-Pérez, R. Mayén-Estrada, R. Macip-Ríos and I. Dovgal

Morphometric Variations of Discophrya Elongata (Ciliophora, Suctorea) Attached to Two Different Species of Aquatic True Bugs (Hemiptera, Prosorrhyncha, Nepomorpha)

Morphometric variation in Discophrya elongata living as epibionts of two species of aquatic true bugs, Corisella edulis and Notonecta unifasciata, collected from the same pond in Mexico are discussed. Factors that may be responsible for observed variability, especially hydrodynamic loads and long-term modifications, also are identified and discussed.