A preliminary investigation of siliceous microfossil succession in late quaternary sediments from Lake Baikal, Siberia

M. L. Julius, E. F. Stoermer, S. M. Colman, T. C. Moore

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Siliceous microfossil assemblage succession was analyzed in a 100 m sediment core from Lake Baikal, Siberia. The core was recovered from the lake's central basin at a water depth of 365 m. Microfossil abundance varied greatly within the intervals sampled, ranging from samples devoid of siliceous microfossils to samples with up to 3.49 x 1011 microfossils g-1 sediment. Fluctuations in abundance appear to reflect trends in the marine δ18O record, with peak microfossil levels generally representing climate optima. Microfossil taxa present in sampled intervals changed considerably with core depth. Within each sample a small number of endemic diatom species dominated the assemblage. Changes in dominant endemic taxa between sampled intervals ranged from extirpation of some taxa, to shifts in quantitative abundance. Differences in microfossil composition and the association of variations in abundance with climate fluctuations suggest rapid speciation in response to major climatic excursions.

Original languageEnglish (US)
Pages (from-to)187-204
Number of pages18
JournalJournal of Paleolimnology
Volume18
Issue number2
StatePublished - 1997

Bibliographical note

Copyright:
Copyright 2005 Elsevier Science B.V., Amsterdam. All rights reserved.

Keywords

  • Chrysophyte cysts
  • Climate change
  • Diatoms
  • Lake Baikal
  • Paleolimnology
  • Russia

Continental Scientific Drilling Facility tags

  • BDP

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