A late-glacial transition from Picea glauca to Picea mariana in southern New England |
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| Authors: | Matts Lindbladh W Wyatt Oswald David R Foster Edward K Faison Juzhi Hou Yongsong Huang |
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| Institution: | aSouthern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Box 49, 230 53 Alnarp, Sweden;bDepartment of Communication Sciences and Disorders, Emerson College, Boston, MA 02116-4624, USA;cHarvard Forest, Harvard University, Petersham, MA 01366, USA;dDepartment of Geological Sciences, Brown University, Providence, RI 02912, USA |
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| Abstract: | Picea is an important taxon in late-glacial pollen records from eastern North America, but little is known about which species of Picea were present. We apply a recently developed palynological method for discriminating the three Picea species in eastern North America to three records from New England. Picea glauca was dominant at  14,500–14,000 cal yr BP, followed by a transition to Picea mariana between 14,000 and 13,500 cal yr BP. Comparison of the pollen data with hydrogen isotope data shows clearly that this transition began before the beginning of the Younger Dryas Chronozone. The ecological changes of the late-glacial interval were not a simple oscillation in the position of a single species' range, but rather major changes in vegetation structure and composition occurring during an interval of variations in several environmental factors, including climate, edaphic conditions, and atmospheric CO2 levels. |
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| Keywords: | Black spruce CART CO2 Forest history New England Picea glauca Picea mariana Picea rubens Pollen analysis Red spruce White spruce Younger Dryas |
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