From the lagoon to the meromictic lake: a case study of lake-bottom sediments of Lake Kislo-Sladkoe (the Karelian Coast of White Sea, Russia)

  • Shilova O.S. 1
  • Leontiev P.A. 2
  • Vakhrameeva E.A. 3
  • Losyuk G.N. 3
  • Grigoriev V.A. 4
  • Krasnova E.D. 1
  • Repkina T.Yu. 1
  • Kublitskiy U.A. 2
  • 1 Lomonosov Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia
    2 Herzen State Pedagogical University of Russia, Nab. Moyki 48, St. Petersburg, 191186, Russia
    3 N. Laverov Federal Center for Integrated Arctic Research Russian Academy of Science (FCIArctic RAS) Severnoi Dviny Emb., 23., Arkhangelsk, 163000, Russia
    4 St Petersburg University, Moskovsky prospect, 9, Saint-Petersburg, 190031, Russia
Keywords: diatoms, grain-size, geochemistry, radioisotope dating (210Pb), meromictic lakes, lake-bottom sediments, White Sea

Abstract

The distribution of diatoms in the core of bottom sediments of the small meromictic Lake Kislo-Sladkoe on the Karelian Coast of White Sea was studied. The changes in diatom associations in the column show the isolation of the lagoon from the sea and its transformation into a meromictic lake. First alteration of dominant species marks the decrease of hydrodynamic activity as a result of the formation of spit and transformation of the lagoon into semi-closed bay. Second shift in species composition reflects the onset of the strong stratification and occurrence of a bottom anoxic layer.
Published
2020-08-27
Section
Articles