Paleontological records indicate the occurrence of open woodlands in a dry inland climate at the present-day Arctic coast in western Beringia during the Last Interglacial |
| |
| Authors: | Frank Kienast Sebastian Wetterich Svetlana Kuzmina Lutz Schirrmeister Andrei A. Andreev Pavel Tarasov Larisa Nazarova Annette Kossler Larisa Frolova Viktor V. Kunitsky |
| |
| Affiliation: | 1. Senckenberg, Research Institute and Natural History Museum, Research Station for Quaternary Palaeontology, Am Jakobskirchhof 4, 99423 Weimar, Germany;2. Alfred Wegener Institute for Polar and Marine Research, Department of Periglacial Research, Telegrafenberg A43, 14473 Potsdam, Germany;3. University of Alberta, Department of Earth and Atmospheric Sciences, T6G 2E3 Edmonton, Canada;4. Freie Universität Berlin, Institute of Geological Sciences, Malteserstr. 74-100, 12249 Berlin, Germany;5. Faculty of Biology and Soil, Kazan State University, 420008 Kazan, Russia;6. Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, ul. Merzlotnaya, 36, 677010 Yakutsk, Russia;7. Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya, 123, 117868 Moscow, Russia;8. Institute of Geology und Mineralogy, University of Cologne, Zuelpicher Str. 49A, 50674 Cologne, Germany;1. NTNU, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Engineering Design and Materials, Tribology Lab, N-7491 Trondheim, Norway;2. Aker Solutions, N-3408 Tranby, Norway;1. Department of Botany and Zoology, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;2. Department of Vegetation Ecology, Institute of Botany, The Czech Academy of Sciences, Lidická 25/27, 602 00 Brno, Czech Republic;3. Central Siberian Botanical Garden, Russian Academy of Sciences, Zolotodolinskaya 101, 630090 Novosibirsk, Russia;4. Department of Biodiversity and Plant Systematics, Centre for Organismal Studies (COS) Heidelberg, Heidelberg University, Im Neuenheimer Feld 345, 69120 Heidelberg, Germany;5. South-Siberian Botanical Garden, Altai State University, Lenina 61, 656049 Barnaul, Russia;6. Department of Botany, Moravian Museum, Hviezdoslavova 29a, 627 00 Brno, Czech Republic;7. Biology Department, University of New Mexico, 87131 Albuquerque, NM, USA;8. Institute of Plant Sciences, NAWI Graz, University of Graz, Holteigasse 6, 8010 Graz, Austria;9. Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 9, 845 23 Bratislava, Slovakia;1. Institute of Archaeology and Ethnography, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia;2. A.P. Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, Irkutsk 664033, Russia;3. Institute of Geological Sciences, Palaeontology, Free University Berlin, Malteserstraße 74-100, Building D, 12249 Berlin, Germany;4. Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia;1. Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland;2. Department of Plant Biology, 265 Morrill Hall, University of Illinois, 505 South Goodwin Avenue, Urbana, IL 61801, USA;3. Department of Geology, 265 Morrill Hall, University of Illinois, 505 South Goodwin Avenue, Urbana, IL 61801, USA;4. Department of Ecology and Environmental Science, SE-90187 Umeå, Sweden;5. School of Integrative Biology, 286 Morill Hall, University of Illinois, 505 South Goodwin Avenue, Urbana, IL 61801, USA;6. Department of Geography, University of Exeter, Exeter, Devon, EX4 4RJ, UK;7. Geological Institute, ETH Zurich, Sonneggstrasse 5, CH-8092 Zurich, Switzerland;1. Graduate School of Horticulture, Chiba University, 648 Matsudo, Chiba 271-8510, Japan;2. Faculty of Risk and Crisis Management, Chiba Institute of Science, 3 Shiomi, Choshi, Chiba 288-0025, Japan;3. Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502 Japan;1. Department of Earth, Environmental, and Planetary Sciences, Brown University, 324 Brook St., Providence, RI 02912, United States;2. The Ecosystems Center, Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543, United States |
| |
| Abstract: | Permafrost records, accessible at outcrops along the coast of Oyogos Yar at the Dmitry Laptev Strait, NE-Siberia, provide unique insights into the environmental history of Western Beringia during the Last Interglacial. The remains of terrestrial and freshwater organisms, including plants, coleopterans, chironomids, cladocerans, ostracods and molluscs, have been preserved in the frozen deposits of a shallow paleo-lake and indicate a boreal climate at the present-day arctic mainland coast during the Last Interglacial. Terrestrial beetle and plant remains suggest the former existence of open forest-tundra with larch (Larix dahurica), tree alder (Alnus incana), birch and alder shrubs (Duschekia fruticosa, Betula fruticosa, Betula divaricata, Betula nana), interspersed with patches of steppe and meadows. Consequently, the tree line was shifted to at least 270 km north of its current position. Aquatic organisms, such as chironomids, cladocerans, ostracods, molluscs and hydrophytes, indicate the formation of a shallow lake as the result of thermokarst processes. Steppe plants and beetles suggest low net precipitation. Littoral pioneer plants and chironomids indicate intense lake level fluctuations due to high evaporation. Many of the organisms are thermophilous, indicating a mean air temperature of the warmest month that was greater than 13 °C, which is above the minimum requirements for tree growth. These temperatures are in contrast to the modern values of less than 4 °C in the study area. The terrestrial and freshwater organism remains were found at a coastal exposure that was only 3.5 m above sea level and in a position where they should have been under sea during the Last Interglacial when the global sea level was 6–10 m higher than the current levels. The results suggest that during the last warm stage, the site was inland, and its modern coastal situation is the result of tectonic subsidence. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
