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TZID:Europe/Berlin
TZUNTIL:20071028T010000Z
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DTSTART:20051030T030000
TZOFFSETFROM:+0200
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RDATE:20061029T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53302id
DTSTAMP:20260804T214845Z
DESCRIPTION:During the last glaciation (~70-20 kyr BP)\, the occurrence of 
 cyclical millennial timescale temperature increases (1-2 kyr) has been rec
 orded across the whole North Hemisphere. However\, their impact on the env
 ironment in Europe remains poorly documented due to the lack of high resol
 ution pollen records north of the Mediterranean domain. In this periglacia
 l area\, evidences of rapid climatic changes are found in loess deposits a
 lternating with tundra soils\, in which numerous shells of terrestrial mol
 luscs were preserved. Between 34 and 20 kyr BP\, the high resolution mollu
 scan analysis performed in the Nussloch loess sequence (Rhine Valley\, Ger
 many) indicates that humidity increases and vegetation decreases are assoc
 iated with tundra soils. They are followed by large increases in mollusc p
 opulations indicating temperature increases and that we correlated with gl
 obal climatic warmings recorded in Greenland ice-cores. For the interval 3
 4-20 kyr BP\, molluscan populations also show cyclical fluctuations but th
 e lower resolution of the record precludes the definition of such a precis
 e framework.\nAnother approach in quaternary malacology is the development
  of transfer functions to quantify climatic parameters. Hence\, we adapted
  the Mutual Climatic Range method to molluscan assemblages. Tests showed t
 hat modern distributions of taxa are mainly constrained by temperature par
 ameters. Applied on modern assemblages\, the method allowed the reconstruc
 tion of the modern European latitudinal temperature gradient. The applicat
 ion of fossil assemblage from Achenheim (Alsace\, France) reconstructed ma
 jor temperature variations for the last climatic cycle. The results are en
 couraging but ameliorations are still necessary before the method can be f
 ully functional.\nFor the Nussoch section\, we thus decided to combine ami
 no acid racemization and luminescence dating to quantify temperature chang
 es.
DTSTART;TZID=Europe/Berlin:20060202T161500
DTEND;TZID=Europe/Berlin:20060202T235959
LOCATION:H6
SUMMARY:Dr. Olivier Moine\, Lehrstuhl für Geomorphologie\, Universität Bayr
 euth: Slow snails and rapid climatic change
TRANSP:TRANSPARENT
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