Сезонные изменения кумуляции углеводородов в вобле дельты Волги

Abstract

The importance of the research is conditioned by the increasing activity of the fuel and energy complex in the Volga-Caspian basin and as a consequence by the emergence of threat to the biodiversity of aquatic ecosystems. The assessment of the long-term and seasonal dynamics of hydrocarbon accumulation in the Volga River delta fish was carried out using the example of a roach. IR spectrophotometry method revealed the hydrocarbon content in the muscles and internal organs of the fish. It is demonstrated that the maximum level of hydrocarbons accumulation in the organs and tissues of the roach was observed from 2007 to 2013, relative to the later period from 2014 to 2020, excluding 2016. The regularity of increasing hydrocarbons concentration in the roach from summer to autumn in the period from 2007 to 2012 is pronounced. Until 2013 (inclusive), there were a number of conditions that contribute to the pronounced hydrocarbons accumulation in the body of the roach in the period from summer to autumn (the period of its summer feeding), which is primarily due to the general level of ecosystem pollution as well as the ability of forage objects to effectively accumulate a wide variety of substances. Later the process of hydrocarbon intake and elimination processes came to a state of dynamic equilibrium which is probably due to a decrease in the overall level of environmental pollution.