Title Diatom record from Lake Hovsgol, Mongolia, during the last 1 Ma; the results from the HDP-04 drill core
Author Khursevich, G.K.; Prokopenko, A.A.
Author Affil Khursevich, G.K., M. Tank State Pedagogical University, Department of Botany, Minsk, Belarus. Other: Memorial University of Newfoundland, Canada; University of South Carolina
Source Lake Hovsgol basin; a new study site for long continental paleoclimate records in continental interior Asia, edited by A.A. Prokopenko and N.R. Catto. Quaternary International, 205(1-2), p.84-97, . Publisher: Pergamon, Oxford, United Kingdom. ISSN: 1040-6182
Publication Date Aug. 15, 2009
Notes In English. 20 refs. GeoRef Acc. No: 307813
Index Terms algae; climatic change; glacial deposits; lacustrine deposits; lake deposits; paleoclimatology; Quaternary deposits; sediments; Russia--Baikal rift zone; Mongolia; Asia; assemblages; Baikal rift zone; biostratigraphy; Brunhes Chron; Cenozoic; climate change; Commonwealth of Independent States; cores; Cyclotella; diatoms; Far East; glacial environment; highstands; interglacial environment; lacustrine environment; Lake Hovsgol; lake sediments; microfossils; paleoenvironment; Plantae; Quaternary; Russian Federation; Stephanodiscus; terrestrial environment; upper Quaternary
Abstract Quantitative diatom abundance and species composition was studied in the longest 81-m Lake Hovsgol drill core, HDP-04. Lake Hovsgol diatom biostratigraphy of the past 1 Ma includes 14 local diatom assemblage zones (LDAZ). Planktonic diatom flora of Lake Hovsgol is dominated by members of Stephanodiscus and Cyclotella. A large-scale shift from Stephanodiscus-dominated to Cyclotella-dominated flora occurred in the mid-Brunhes chron. Significant morphological variability of Cyclotella ocellata complex and Cyclotella cf. minuta, as well as the presence of new extinct endemic taxa of genus Stephanodiscus, suggest long speciation and/or adaptation history of diatom flora. The recognition of taxa morphologically similar to the extinct endemic species of Lake Baikal suggests potential correlation ties between Lake Hovsgol and Lake Baikal diatom biostratigraphies around the MIS 17, MIS 25, and, possibly, MIS 15 interglacial intervals. Narrow peaks of diatom abundance in the Lake Hovsgol sedimentary record are episodic and short-lived. These peaks may represent humid optima of past interglacials and/or interstadials, characterized by elevated surface runoff in the Hovsgol basin and relative highstands of the lake.
URL http://hdl.handle.net/10.1016/j.quaint.2009.02.003
Publication Type journal article
Record ID 65004857