Diatom analysis of sediment core from Lake Krasnoe (Leningrad region) allowed to define the sedimentation stages in the lake basin during the Late Pleistocene and Early Holocene. The Late Pleistocene stage is characterized by a monodominant, low-diversity diatom complex, low bioproductivity, dominance of anaerobic conditions in the water column, as well as high sedimentation rates. The sedimentation conditions were unstable but more optimal for the development of diatoms and increasing of species diversity during the Early Holocene. At thesame time the amount of dissolved nutrients increased, sediment income from the watershed decreased and redox conditions stabilized. The water level in Lake Krasnoe experienced fluctuations, being both an independent lake and part of Baltic Ice Lake and Lake Ladoga.
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Fomicheva et al. (2024) studied this question.
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