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Multiproxy Record of Late Pleistocene–Holocene Climate and Vegetation Changes from a Peat Bog in Patagonia

Published online by Cambridge University Press:  20 January 2017

Elise Pendall ,
Vera Markgraf ,
James W. C. White ,
Mark Dreier  and
Ray Kenny
Elise Pendall
Affiliation:
Institute of Arctic and Alpine Research, Campus Box 450, University of Colorado, Boulder, Colorado 80309-0450
Vera Markgraf
Affiliation:
Institute of Arctic and Alpine Research, Campus Box 450, University of Colorado, Boulder, Colorado 80309-0450
James W. C. White
Affiliation:
Institute of Arctic and Alpine Research, Campus Box 450, University of Colorado, Boulder, Colorado 80309-0450
Mark Dreier
Affiliation:
Institute of Arctic and Alpine Research, Campus Box 450, University of Colorado, Boulder, Colorado 80309-0450
Ray Kenny
Affiliation:
Department of Geology, Highlands University, Las Vegas, New Mexico 87701
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Abstract

Pollen assemblage changes and stable hydrogen isotope analysis of mosses (Sphagnum magellanicum and Drepanocladus s.l.) from a bog in Tierra del Fuego, Argentina, provided independent proxies for reconstructing changes in effective moisture and temperature over the past 16,000 cal yr B.P. A deterministic model was used to reconstruct the stable hydrogen isotope composition of meteoric water from the D/H ratios of bog mosses over the last 16,000 years. Abrupt changes in temperature, as recorded in D/H ratios of moss cellulose, were accompanied by synchronous changes in vegetation composition during the late Pleistocene and early and middle Holocene, when moisture levels were lower than today. In contrast, temperature variability during the late Holocene was not accompanied by comparable vegetation changes. In particular, grass pollen (Poaceae) increased during periodic cold spells between 15,000 and 11,000 cal yr B.P., but a cold spell of similar magnitude ca. 2000 cal yr B.P. did not appear to affect vegetation. During the late Pleistocene, the isotopic record from the peat core shows variations similar to the D/H ratios in the Antarctic Taylor Dome ice core. However, the timing of the changes in the Harberton record is more in line with the timing of other Southern Hemisphere records.

Keywords

paleoecologypaleoclimatepollenD/H ratiosstable isotopesPatagoniaSouth AmericaTierra del Fuego

Information

Type
Research Article
Information
Quaternary Research , Volume 55 , Issue 2 , March 2001 , pp. 168 - 178
Copyright
University of Washington

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