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  • 1 Department of Botany, Hungarian Natural History Museum, Budapest, Hungary
  • 2 Hungarian Academy of Sciences — Hungarian, Natural History Museum Research Group for Paleontology, Budapest, Hungary
  • 3 Department of Limnology, University of Pannonia, Veszprém, Hungary
  • 4 Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen, Hungary
  • 5 Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen, Hungary
  • 6 Biodiversität und Klima Forschungszentrum, Frankfurt am Main, Germany
  • 7 H-1476, Budapest, P.O. Box 222, Hungary
  • 8 H-4010, Debrecen, P.O. Box 21, Hungary
  • 9 Senckenberganlage 25, D-60325, Frankfurt am Main, Germany
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Abstract

A high-resolution paleolimnological record from Lake Brazi (TDB-1; 45°23’47″N, 22°54’06″E, 1740 m a.s.l.), a small, glacial lake in the Retezat (South Carpathian Mountains, Romania) provides a sensitive record of the impacts of late glacial climatic change on siliceous algal assemblages. The sequence, ranging from 15,700 cal yr BP to 9500 cal yr BP, suggests that the most significant changes in diatom assemblages took place at 12,800 and 10,400 cal yr BP, when alkaliphilous fragilarioid taxa were replaced by acidophilous diatoms. Altogether eight zones were distinguished with sharp and rapid changes of diatom assemblages. The paper discusses the application of siliceous algae in multi-proxy paleolimnological analyses, demonstrates the advantages and disadvantages of this proxy and presents the story of floristic discovery of unique diatom assemblages, the closest recent analogs of which are found in the arctic region.

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