Publication Date:
2021-07-21
Description:
A new accerator mass spectrometry (AMS)‐dated sedimentary record from Lake Ochaul (54°14′N, 106°28′E; 641 m a.s.l.) in Eastern Siberia covers the interval from ca. 27 850 to 20 400 cal a bp at ca. 180‐year resolution and contributes to a better understanding of the complex spatial vegetation pattern during the Last Glacial Maximum (LGM). Non‐arboreal pollen taxa are abundant in the pollen assemblages (mean value ca. 92.6%), but boreal trees are represented by all major taxa that grow in the lake catchment today, including Betula sect. Albae (0.6–4.8%), Picea (0.6–2.8%), Pinus sibirica (Haploxylon type) (up to 1.5%), Pinus sylvestris (Diploxylon type) (up to 2%), Larix (up to 0.6%) and Abies (up to 0.6%). Betula sect. Nanae/Fruticosae (2–5.2%) and Salix (up to 3.2%) are the most representative boreal shrub taxa. Together with existing modern and fossil pollen data from the wider study region, the current record provides further evidence for the long‐debated presence of boreal trees and shrubs in Eastern Siberia throughout the LGM. Our results show that the Upper Lena was a region in which refugia for arboreal taxa existed and that far‐distant pollen transport can be ruled out as the source of the detected arboreal pollen.
Description:
Government of the Russian Federation
Description:
Social Sciences and Humanities Research Council of Canada
http://dx.doi.org/10.13039/501100000155
Description:
Russian Foundation for Basic Research
http://dx.doi.org/10.13039/501100002261
Description:
Siberian Branch, Russian Academy of Sciences
http://dx.doi.org/10.13039/501100003182
Description:
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Description:
Deutsche Forschungsgemeinschaft
http://dx.doi.org/10.13039/501100001659
Description:
Russian Science Foundation
http://dx.doi.org/10.13039/501100006769
Keywords:
561
;
arboreal pollen
;
biome reconstruction
;
ostracods
;
productive vegetation
;
sediment geochemistry
Type:
article
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