Dvoretskiy T. Assessment of environmental conditions' changes of meadow and mire ecosystems of the Danube delta Kiliyan arm under indirect human impact.

The objects are the meadow and mire ecosystems of the Danube delta Kiliyan arm. The aims are to establish the relation of some biotic and abiotic components of the most typical and spread communities of mire and salt-meadow ecosystems of the Danube delta Kiliyan arm from natural and anthropogenic load factors; to elaborate a technique of definition of changes of ecological conditions and to define the levels of a permissible anthropogenic load. The methods are route-reconnoitering, Broun-Blanke, comparative analysis, mathematical statistics and law of probability. Structural and comparative analysis of natural changes of some biotic and abiotic components of the most typical and spread communities of mire and salt-meadow ecosystems has been carried out. A method of formation of experimental data's representative samples and identification of cause-and-effect relations between conditions' changes and a degree of indirect human impact with natural changes of environment parameters has been suggested in the work. On basis of admissible risk's theory of ecosystems' loss the method of influence assessment of indirect anthropogenous factors to mire and salt-meadow ecosystems was developed and approved. The criterial assessments of biotic and abiotic components have been proposed. The sphere of use is the environmental protection.