Environmentally allowable levels of impact on river ecosystems in the arctic region
Using a case study for the river ecosystems in the Russian Arctic, the methodological approaches are presented to the selection of hydrochemical and hydrobiological parameters and to the estimation of the limits of their variability at which the ecosystem conditions can be considered stable. The research is carried out using the classifiers of water ecosystem conditions developed at the Hydrochemical Institute. Based on the statistical processing of long-term monitoring information carried out by the National Service of Observation of Environmental Conditions, the environmentally allowable ranges of variations of hydrochemical and hydrobiological parameters are separated for the river ecosystems of the Arctic region. Determined are the allowable limits of variations of concentration of priority pollutants and the upper limits are considered as the environmentally allowable levels of impact.