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| Titel |
Vegetation responses to interglacial warming in the Arctic: examples from Lake El'gygytgyn, Far East Russian Arctic |
| VerfasserIn |
A. V. Lozhkin, P. M. Anderson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 3 ; Nr. 9, no. 3 (2013-06-11), S.1211-1219 |
| Datensatznummer |
250018062
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| Publikation (Nr.) |
 copernicus.org/cp-9-1211-2013.pdf |
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| Zusammenfassung |
| Preliminary analyses of Lake El'gygytgyn sediment
indicate a wide range of ecosystem responses to warmer than present
climates. While palynological work describing all interglacial vegetation is
ongoing, sufficient data exist to compare recent warm events (the
postglacial thermal maximum, PGTM, and marine isotope stage, MIS5) with
"super" interglaciations (MIS11, MIS31). Palynological assemblages
associated with these climatic optima suggest two types of vegetation
responses: one dominated by deciduous taxa (PGTM, MIS5) and the second by
evergreen conifers (MIS11, MIS31). MIS11 forests show a similarity to modern
Picea–Larix–Betula–Alnus forests of Siberia. While dark coniferous forest also characterizes MIS31,
the pollen taxa show an affinity to the boreal forest of the lower Amur
valley (southern Russian Far East). Despite vegetation differences during
these thermal maxima, all glacial–interglacial transitions are alike, being
dominated by deciduous woody taxa. Initially Betula shrub tundra established and
was replaced by tundra with tree-sized shrubs (PGTM), Betula woodland (MIS5), or
Betula–Larix (MIS11, MIS31) forest. The consistent occurrence of deciduous forest and/or
high shrub tundra before the incidence of maximum warmth underscores the
importance of this biome for modeling efforts. The El'gygytgyn data also
suggest a possible elimination or massive reduction of Arctic plant
communities under extreme warm-earth scenarios. |
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