Title: Evolution of lakes in the European permafrost peatlands
Abstract:
An example of thermokarst lakes of the Bolshezemelskaya tundra, a comparative assessment of the long-term dynamics of air temperature, as well as the main hydrochemical and hydrobiological parameters was carried out. Some decrease in pH, chlorophyll a, calcium cations, petroleum products, number and biomass of zooplankton was noted, which, in turn, may indicate a decrease in anthropogenic influence on these ecosystems. A comparative analysis with the data of microbiological studies demonstrated stability of the total bacterioplankton abundance indicators and some decrease in the number of heterotrophic bacteria. Thus, comprehensive field observations, experimental work to identify the role of bacteria in carbon transformation and field hydrochemical and hydrobiological studies in various thermokarst water bodies have revealed the main physico-chemical and biotic factors controlling the biogeochemistry of the carbon cycle in tundra and subarctic water landscapes. Assessment of the substance cycle in thermokarst lakes, data on gas exchange between the water surface and the atmosphere, which will help to better predict the dynamic changes occurring in various parts of the biogeochemical cycle of carbon and related elements, under conditions of increasing load of pollutants in natural and anthropogenic-modified ecosystems and the ongoing climatic changes were performed. The global significance of obtained results is that the changes in ground vegetation, rather than mere frozen peat thawing, and water and air temperature rise, may exert the primary control on C, major and trace element balance in aquatic ecosystems of tundra peatlands under climate warming scenario.
The study was funded by RSF No 22-17-00253
Biography:
Liudmila S. Shirokova is an experienced limnologist and microbiologist working at the interface between aquatic biogeochemistry and geomicrobiology. Her research activity focuses on experimental biogeochemistry of carbon and metals in natural waters, microbial activity in soils and natural waters as well as on field limnology. She has over 100 published papers in international peer-reviewed journals and received over 2500 citations (H.I. = 31 in WoS).
