A comparison of the palaeolimnology of Peipsi and Võrtsjärv: connected shallow lakes in north-eastern Europe for the twentieth century, especially in relation to eutrophication progression and water-level fluctuations

摘要: We applied a multi-proxy palaeolimnological approach to provide insights into the natural variability and human-mediated trends of two interconnected temperate large shallow lakes, Peipsi Vortsjarv, during twentieth century. The history lakes was assessed on basis age-related changes in sediment main constituents (water, organic matter carbonate), sub-fossil pigments, diatom assemblages dissolved pore water. temporal palaeodata indicate an increase in-lake biological production both from about 1960s, suggesting enhanced nutrient inputs. In subsequent decades, gradual autochthonous becomes more obvious, indicating progressive eutrophication lakes. Palaeolimnological indicators record Lake slight recession lake’s 1990s but not for Vortsjarv. results study also suggest that after became eutrophied, climatically induced water-level fluctuations ceased be driver determining abundance phytoplankton. Responses human-induced impacts are better recorded sediments than those which is shallower where wave-induced resuspension deposits markedly smooths or erases signals environmental changes. investigation expand knowledge how respond perturbations, including lake catchment areas capability store chronology sequence these