Transformation of ichthyofauna in freshwater ecosystems of Karelia under conditions of climate change

Abstract

Analysis of the effect of changes in climatic parameters on the state of freshwater ecosystems is of special interest in the context of increasing attention in the problem of global climate warming. The results presented in the paper characterize the retrospective dynamics of relative catches of different fish species in the main fishery lakes of Karelia. It is shown that the proportion of spring spawning species in commercial catches from all the lakes has increased over the past 60 years.

Modern changes in the ecosystem of Lake Onego with climate warming

“…and Nazarova, 2015). Climate changes have affected the state of the catchment area: there is an increase in the number of thaws and in the proportion of liquid precipitation over the solid one, as well as a decrease in soil freezing (Nazarova, 2015).…”

“…Despite the significant interannual variability of the total river inflow into Onego, there are no trends over 60 years , since the increase in the total evaporation offsets the annual total precipitation. There is an evidence that the duration of the 'biological summer' for 60 years has increased more than by 15 days (Nazarova, 2015). At the same time, the share of spring-spawning species of fish tended to increase relative to autumn-spawning ones (Georgiev 3.…”