Table 6 The mean percent change (as an absolute value) and the overall direction of change in the three ecophysiological classes (pyrogenicity and drought tolerance combined) from pre-European settlement to modern day in pollen and tree survey data for each forest type north (n = 4) and south (n = 3) of the tension zone line, including a grand mean for each biome. Forest type cells without an arrow had neutral changes for that parameter. See Table 1 for forest type abbreviations

From: Global change impacts on forest and fire dynamics using paleoecology and tree census data for eastern North America