The prospect of rapid, trace-gas induced climate change over the next 100–150 years has raised scientific and policy interest on the rates at which plant species, particularly tree species, can respond to these changes (Houghton et al. 1992; Davis & Zabinski 1992). Two particular responses are of interest over the next century: migration or movement of range limits and changes in abundance (i.e.,
... [Show full abstract] tree density). This paper focuses on tree species migration, and particularly on what the fossil pollen record can tell us about potential rates of future migration.