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Fig. 1. Comparison of present and past northern limits for tree survival in northern Siberia. Present-day distribution of the Boreal forest (brown) is based on the vegetation map produced by Grid Arendal and published by the World Wide Fund for Nature. Mid-Holocene limits to forest trees are regional generalizations from locations of fossil remains (green, evergreen—pine and/or spruce species; red, tree—birch; purple, larch) based on Kremenetski et al. (1998). Modern limits for the northern survival of individual tree species (colours as above) are also taken from Kremenetski et al. (1998) as drawn by Callaghan et al., 2002.
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