ANTHROPOGENIC IMPACT ON SALMON WATERCOURSES DURING THE CONSTRUCTION AND OPERATION OF THE MAIN GAS PIPELINE (KAMCHATKA)
Impact on salmon watercourses during the construction and operation of the gas pipeline occurs in the form of fine suspension inflow from the shores and along the route into the riverbeds. Deposited on the bottom, it changes the granule metric composition of the soil and, thus, the habitat of benthic animals. Changes in the composition and structure of macrozoobenthos on parts of the river located in the gas pipeline zone compared to the areas without anthropogenic influence were found in most of the studied watercourses. They are expressed in the oligochetes index increase, Margalef’s specific species richness index decrease, ERT species composition depletion, ERT index decrease and the invertebrates total number and biomass changes. Such changes lead to the deterioration of the young salmon and other fish species forage base.