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Diatom assemblage dynamics during abrupt climate change: The response oflacustrine diatoms to Dansgaard-Oeschger cycles during the last glacialperiod
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
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2010 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 44, no 2, 397-404 p.Article in journal (Refereed) Published
Abstract [en]

The sedimentary record from the paleolake at Les Echets in eastern France allowed a reconstruction of the lacustrine response to several abrupt climate shifts during the last glacial period referred to as Dansgaard-Oeschger (DO) cycles. The high-resolution diatom stratigraphy has revealed distinct species turnover events and large fluctuations in stable oxygen isotope values in diatom frustules, as a response to DO climate variability. More or less identical species compositions became re-established during each DO stadial and interstadial phases, respectively. However, the relative abundance of the most dominant species within these assemblages varies and might indicate differences in climatic conditions. Interstadial phases are characterized by identical species successions. Transitions from stadial to interstadial conditions show a distinct Fragilaria-Cyclotella succession, which resembles the diatom regime shifts that have been recognized in some lakes in the Northern Hemisphere since the mid-nineteenth century.

Place, publisher, year, edition, pages
2010. Vol. 44, no 2, 397-404 p.
Keyword [en]
Diatoms, Oxygen Isotopes, Les Echets, Dansgaard–Oeschger cycles
National Category
Climate Research
Research subject
Geology
Identifiers
URN: urn:nbn:se:su:diva-53328DOI: 10.1007/s10933-009-9350-7OAI: oai:DiVA.org:su-53328DiVA: diva2:390506
Available from: 2011-01-21 Created: 2011-01-21 Last updated: 2017-12-11Bibliographically approved

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Ampel, LindaWohlfarth, BarbaraRisberg, Jan
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Department of Geological SciencesDepartment of Physical Geography and Quaternary Geology (INK)
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