Universität zu Köln

Andreev, Andrei A., Tarasov, Pavel E., Wennrich, Volker ORCID: 0000-0003-3617-1963 and Melles, Martin ORCID: 0000-0003-0977-9463 (2016). Millennial-scale vegetation changes in the north-eastern Russian Arctic during the Pliocene/Pleistocene transition (2.7-2.5 Ma) inferred from the pollen record of Lake El'gygytgyn. Quat. Sci. Rev., 147. S. 245 - 259. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

The sediment record of Lake El'gygytgyn (67 degrees 30'N, 172 degrees 05'E) spans the past 3.6 Ma and provides unique opportunities for qualitative and quantitative reconstructions of the regional paleoenvironmental history of the terrestrial Arctic. Millennial-scale pollen studies of the sediments that accumulated during the Late Pliocene and Early Pleistocene (ca. 2.7 to 2.5 Ma) demonstrate orbitally-driven vegetation and climate changes during this transitional interval. Pollen spectra show a significant vegetation shift at the Pliocene/Pleistocene boundary that is, however, delayed by a few thousand years compared to lacustrine response. About 2.70-2.68 Ma the vegetation at Lake El'gygytgyn, currently a tundra area was mostly dominated by larch forests with some shrub pine, shrub alder and dwarf birch in understory. During the marine isotope stages G3 and G1, ca. 2.665-2.647 and 2.625-2.617 Ma, some spruce trees grew in the local larch -pine forests, pointing to relatively warm climate conditions. At the beginning of the Pleistocene, around 2.588 Ma, a prominent climatic deterioration led to a change from larch-dominated forests to predominantly treeless steppe- and tundra-like habitats. Between ca. 2.56-2.53 Ma some climate amelioration is reflected by the higher presence of coniferous taxa (mostly pine and larch, but probably also spruce) in the area. After 2.53 Ma a relatively cold and dry climate became dominant again, leading to open steppe-like and shrubby environments followed by climate amelioration between ca. 2.510 and 2.495 Ma, when pollen assemblages show that larch forests with dwarf birch and shrub alder still grew in the lake's vicinity. Increased contents of green algae colonies (Botryococcus) remains and Zygnema cysts around 2.691-2.689, 2.679-2.677, 2.601-2.594, 2.564-2.545, and 2.532-2.510 Ma suggest a spread of shallow-water environments most likely due to a lake-level lowering. These events occurred simultaneously with dry climate conditions inferred from broad distribution of steppe habitats with Artemisia and other herbs. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Andreev, Andrei A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tarasov, Pavel E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Melles, Martin UNSPECIFIED orcid.org/0000-0003-0977-9463 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-265085
DOI:	10.1016/j.quascirev.2016.03.030
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	147
Page Range:	S. 245 - 259
Date:	2016
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PLANT MACROFOSSIL DATA; LAST GLACIAL MAXIMUM; CLIMATE-CHANGE; PLIOCENE; INTENSIFICATION; SEDIMENTS; BIOMES; REGION; AGE; RECONSTRUCTION Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26508