A multi-proxy Lateglacial environmental record from Lake Bled, Slovenia. In: paleolimnological proxies as tools of environmental reconstruction in freshwater.

ANDRIč,M., MASSAFERRO,J., EICHER,U., AMMANN, B, LEUENBERGER,M., MARTINčIč,A., MARINOVA, E AND A. BRANCELJ

HYDROBIOLOGIA

Springer

Año: 2009 vol. 631 p. 121 - 141

0018-8158

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0mm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:SL; mso-fareast-language:SL;} @page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Abstract This study investigates palaeoecological record (δ18O, δ13C, pollen, plant macrofossils, chironomids and cladocera) at LakeBled (Slovenia) sedimentary core in order to better understand the response of terrestrial and aquatic ecosystems to Lateglacial climatic fluctuations. The multi-proxy record suggests that in the Oldest Dryas the landscape around Lake Bled was rather open, presumably because of the cold and dry climate, with a trend towards wetter conditions, as suggested by an increase of tree pollen as well as chironomid and cladocera faunas typical for well oxygenated water. Climatic warming at the beginning of the Lateglacial Interstadial at ca. 14,800 cal yr BP is suggested by an increase of δ18O values, the appearance of Betula and Larix pollen and macrofossils, and a warmth-adapted chironomid fauna. With further warming at ca. 13,800 cal yr BP broadleaved tree taxa (Quercus, Tilia, Ulmus), Artemisia, and Picea increase, whereas chironomid data (Cricotopus B) suggest lowering of lake levels. After 12,800 cal yr BP (and throughout the Younger Dryas) the climate became colder and drier, as indicated by lower δ18O values, decline of trees, increase of microscopic charcoal, xerophytes, and littoral chironomids. A warmer climate, together with the spread of broad-leaved tree taxa and a deeper, more productive lake, mark the onset of the Lateglacial/Holocene transition. These results suggest that terrestrial and aquatic ecosystems at Lake Bled were very dynamic and sensitive to Lateglacial climatic fluctuations.