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BIOTIC RELATIONS BETWEEN PATHOGENIC BACTERIA ERYSIPELOTHRIX RHUSIOPATHIAE AND BLUE-GREEN ALGAE MІCROCYSTIS PULVEREA

A.V. Gulay, O. M. Zhukorskiy

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Ukrainian National Academy of Science, Institute of Agroecology and Environmental Sciences, 12, Metrologichna street, Kyiv, 03143

Being a part of freshwater ecosystems, bacteria E. rhusiopathiae build complex ecological relationships with different species of alive organisms, as well as with numerous species of algae. As a result of these interactions population density of E. rhusiopathiae, as well as some abilities of these bacteria can undergo changes. Taking into account the fact that the agent penetrates into a human body from ground and water, ecological factors that influence bacteria E. rhusiopathiae existence in the environmental domains become of prior epidemic and epizootic importance.

Interaction of the bacteria E. rhusiopathiae VR-2 var. IVM from the collection of the Institute of Veterinary Medicine of Ukrainian National Academy of Science and blue-green algae (Cyanophyta) of type Mіcrocystis pulverea (Wood) Forti emend ) Forti emend. Elenk HPDP-30 from the collection of the Insitute of Hydrobiology Ukrainian National Academy of Science (HPDP) has been investigated. In order to conduct a study of allelopathic influence the seeweed of type M. pulverea was diluted with distilled water in the proportion 1:100 and was filtered through sterilizing cellulose filters with pores in diameter of 0,2 mcm. Sterile distilled water then was added to the filtrate and 0,1 cm3 of type E. rhusiopathiae in accordance with the result of getting delusion of the initial algae type in 1х10-4. Control samples contained analogical correlation of Fitzgerald environment, distilled water and type E. rhusiopathiae species. In the experiments with common cultivation the Erysipelothris bacteria and algae were diluted with the proportion of 1:10.

It has been found out, that in fresh water ecosystems algae M. pulverea showed allelopathic activity in direction of the populations of E. rhusiopathiae bacteria. Under conditions of controlled experiment the density of E. Rhusiopathiae species declines to 13,0–21,8 % influenced by biologically active substances produced by the algae of type M. pulverea, as compared with the control, so this fact can witness to their bacteriostatic action. Under condition of common cultivation bacteria E. rhusiopathiae didn’t influence on the coefficient of biomass increase by algae M. pulverea.

Keywords: BACTERIA ERYSIPELOTHRIX RHUSIOPATHIAE, BLUE-GREEN ALGAE MІCROCYSTIS PULVEREA, ALLELOPATHIC INFLUENCE


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