Paleoclimatic implications of glacial and postglacial refugia for Pinus pumila in western Beringia

Anderson, P M; Lozhkin, A V; Solomatkina, T B; Brown, T A

doi:10.1016/j.yqres.2009.09.008

Paleoclimatic implications of glacial and postglacial refugia for Pinus pumila in western Beringia

Journal Article · Fri Feb 05 04:00:00 EST 2010 · Quaternary Research, vol. 73, no. 2, March 1, 2010, pp. 269-276

DOI:https://doi.org/10.1016/j.yqres.2009.09.008· OSTI ID:991529

Anderson, P M; Lozhkin, A V; Solomatkina, T B; Brown, T A

Palynological results from Julietta Lake currently provide the most direct evidence to support the existence of a glacial refugium for Pinus pumila in mountains of southwestern Beringia. Both percentages and accumulation rates indicate the evergreen shrub survived until at least {approx}19,000 14C yr B.P. in the Upper Kolyma region. Percentage data suggest numbers dwindled into the late glaciation, whereas pollen accumulation rates point towards a more rapid demise shortly after {approx}19,000 14C yr B.P. Pinus pumila did not re-establish in any great numbers until {approx}8100 14C yr B.P., despite the local presence {approx}9800 14C yr B.P. of Larix dahurica, which shares similar summer temperature requirements. The postglacial thermal maximum (in Beringia {approx}11,000-9000 14C yr B.P.) provided Pinus pumila shrubs with equally harsh albeit different conditions for survival than those present during the LGM. Regional records indicate that in this time of maximum warmth Pinus pumila likely sheltered in a second, lower-elevation refugium. Paleoclimatic models and modern ecology suggest that shifts in the nature of seasonal transitions and not only seasonal extremes have played important roles in the history of Pinus pumila over the last {approx}21,000 14C yr B.P.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 991529

Report Number(s):: LLNL-JRNL-423287

Journal Information:: Quaternary Research, vol. 73, no. 2, March 1, 2010, pp. 269-276, Journal Name: Quaternary Research, vol. 73, no. 2, March 1, 2010, pp. 269-276 Journal Issue: 2 Vol. 73

Country of Publication:: United States

Language:: English

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Paleoclimatic implications of glacial and postglacial refugia for Pinus pumila in western Beringia

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