Ecology
The ivestigations of coastal Daghestan region of Caspy ( 7–Karaman – Reductoric settlement) showed, that the bottom of this region was subjected to a visible changes as compared with observations of past years: the sand grounds, observed earlier to 5 m depth, is meet to 10 – 12 m depth, where from the silt grounds are begin. In this connection the bottom biocenosis, usual to a silt grounds moved from 5 m to 10 – 12 depth and an area of Pontogammarus biocenosis some widened, but the consistence of species of the bottom fauna almost didn't change for all that. Average biomass of benthos equal to 23,15 g/m2.
It's established that some hard metals and oilproducts content visibly exceeds MPC (maximum permissible concentration) in the investigated region, and, nevertheless, separate populations of hydrobionts, able to reproduce and to give progeny are meet here. Mechanism of adaptation of these organisms in polluted environment ought to be reveal in the future investigations.
Institute of Biological Resources of the Dagestan Centre of Science
of the Russian Academy of Sciences