Kravchuk A. Modern changes in conditions of a sedimentation and benthic foraminifera as indicators of pollution of bottom deposits of a northwest shelf of the Black Sea.

The work is devoted to application of the benthic foraminifera for an evaluation of an geoecological situation on a northwest shelf of the Black Sea. The analysis of conditions of a sedimentation has shown, that their changes are connected to increase of an outlet of biogenic matters and transferring from eutrophic to hypertrophic (by Y.Zaitcev) phase of development of basin at last decades. The geochemical consequences of pollution on a shelf are shown in summer activization of reduction conditions, decrease pH of deposits, presence of aboriginal hydrogen sulphide. The awake role of organisms with carbonaceous function is marked during biological absorption of toxic bonds. For the first time background allocation and the associations of the foraminifera in region are considered on a polytetical basis for an evaluation of multifactor influence of environment on benthic assemblages. The attributes of stressful situations on population and organismic level include a degree of a surviving of species,morphological changes, failure of sex dimorphism and sulphidization of the foraminifera. These parameters applied for abjection of geographic ranges of a toxic stimulation, development of a sulphidization and anomalous morphology of organisms. For the first time analysis of mineralogical functions of the foraminifera is recommended for bioindication of environment. Key words: the Black Sea, shelf, geoecological situation, benthic foraminifera, pollution, bioindication.