Visnyk of Dnipropetrovsk University. Biology, ecology

13-18

Authors: T. Y. Bets, O. M. Bashtannik

The electrical conductivity of sod-lithogenic soil on the loess-like loams shows logical spatial variability which conforms to the gradient spatial structure. By means of the regression analysis we assessed the relationship between electroconductivity of the technozems and some environmental properties of the agrobiogeocoenosis. Aggregate composition of the fractions of 0.25–0.50, 1–2, 3–5 mm and plants projective cover are essential factors that influence on the electroconductivity of sod-lithogenic soil on loess.

25-33

Authors: O. M. Vasyliv, S. O. Hnatush, O. I. Bilyy, V. B. Getman

Desulfuromonas acetoxidans are obligatory anaerobic gram-negative sulfurreducing eubacteria. The influence of different concentrations of iron (III) chloride hexahydrate, iron (II) sulfate and manganese (II) chloride hexahydrate on D. acetoxidans growth and light scattering properties has been investigated. The correlation between biomass accumulation and changes of the cells’ light scattering properties has been ascertained under the influence of the 3d transition metal salts. The maximum of cell distribution curve equaled 0.49 μm under the influence of all investigated concentrations of iron (III) chloride hexahydrate, iron (II) sulfate and manganese (II) chloride hexahydrate. The highest relative content of cells with maximal size (0.49 μm) and the largest biomass were observed under the influence of 2.5 mM FeCl3×6H2O and 0.5 mM MnCl2×4H2O. Under the influence of FeSO4 the highest D. acetoxidans biomass was obtained with addition of 2.5 mM metal salt in the growth medium. The highest relative cell content with maximal size was observed under the influence of 0.5–1.5 mM FeSO4.

40-44

Authors: Z. V. Gritzay, A. G. Denisenko

The influence of environment pollution by metallurgical industry emissions on woody plants bearing parameters was examined. The results obtained show the decrease of bearing rate, diminution of seeds, fruits and seed cells sizes in woody plants affected by technogenic emissions. Attenuation of the 1000 seeds’ weight was established. Incresing the amount of fruits with development deviations was ascertained. It was found aplasia and abnormal form of the samara fruit of ash and ailanthus trees, arcuation and narrowing of some parts of the catalpa fruitcases. Practical recommendations on using seeds’ sensitive parameters in biomonitoring of woody phytocenoses under technogenic stressful conditions are proposed.

55-60

Authors: V. V. Kachinskaya, G. O. Naumovich

Тhe structural organisation of lichens at a consortium organisation level of the ecosystems is considered. The analysis of species composition and regularities of lichens distribution in Ulmus laevis and Populus nigra consortia in territory of mining and smelting complex of Kryvyi Rih Basin is carried out. It is established that taxonomical structure of lichens consists of 8 lichen species of 6 genera and 5 families. It is ascertained that species composition and regularities of lichens distribution in consortia is determined by the type of industrial load. Predominance of the crustose lichens in the determinants’ consortia, insignificant part of the foliose lichens and total lack of fruticose forms is possible consequence of industrial influence.

71-75

Authors: T. M. Konovalova

The pedoturbation activity of the soil-dwelling mammals results in the complicated spatial soil structure with combined mechanically stable dense soil and the soil mass of low density. Such organization of the soil body has useful combination of the soil properties. The prolonged effect of the mammals’ pedoturbation activity is positive for different constituents of an ecosystem: soil animals, microorganisms and plants.

86-92

Authors: O. I. Lisovets, V. A. Brayilko

Floristic composition of the grass and phytocenotic activity of species in the floodplain forest were studied in the Prysamar’ya region. It is ascertained that investigated phytocenosis has characteristic signs of the floodplain forest: in the spectrum of biomorphes the hemicryptophytes and vegetatively mobile species are prevalent. At the same time among ecomorphs the mesophytes, mesotrophes, heliosciophytes and silvantes are usual. The results of phytoindication analysis confirmed the favourable ecological conditions for the forest geobiocenoses forming. The grass cover of the studied forest ecosystem for the last 40 years remained stable enough: 70 % of the registered species in the past are found there. The typical silvantes are dominanted, but the index of the total projective cover is low.