The paper presents data on nutrient concentration (N, P, their compounds, and Si) in the surface waters of 23 lakes on Bolshoy Solovetsky Island, White Sea, Arkhangelsk region, determined during summer and winter seasons. In summer, samples were taken from the layer of 0.5 m and above the thermocline to characterize surface waters (epilimnion). In winter, sampling was carried out from the 1 m layer and under the subglacial thermocline. Characteristics were obtained for the lake basins and their catchment areas (including their openness and waterlogging). The lakes were classified according to their TDS, water color and degree of humification. It was established that the concentration of nutrients in the surface waters of most lakes is below the lower threshold for optimal algal development, which is controlled by both the atmospheric nutrition of the lakes and the underlying rocks and soils. The Ntot/Ptot ratio showed that phosphorus is the limiting element in most of the lakes. Grouping of lakes by nutrient concentrations in surface waters revealed minimal differences between lakes of the western and southern channel systems. It was shown that Valday, Shchuch’e, Sredny Perth, and Pit’evoye lakes can be used as model objects in studying/predicting the response of the ecosystem to external impacts during long-term studies.
Prilutskaia et al. (Thu,) studied this question.