Ecological Archives A022-033-A4

Kevin M. Potter and Christopher W. Woodall. 2012. Trends over time in tree and seedling phylogenetic diversity indicate regional differences in forest biodiversity change. Ecological Applications 22:517–531

Appendix D (TABLE D1). A table showing measures of phylogenetic diversity (PD), and PD change over time, at three taxonomic scales for forest trees > 2.54 cm dbh on Forest Inventory and Analysis plots in the northern and southern zones.

  Northern trees Southern trees
N Mean PD
Time 2
Mean PD
Time 1
Mean PD
T2-T1
P N Mean PD
Time 2
Mean PD
Time 1
Mean PD
T2-T1
P
(a) Plant
divisions
Angiosperms 3,962 599.40 596.39 3.01 < 0.001 2,136 815.04 810.21 4.83 < 0.001
Gymnosperms 2,917 490.52 489.58 0.94 0.022 1,625 371.38 370.89 0.48 0.045
(b)
Common
families
Betulaceae 2,189 339.90 340.15 -0.25 0.842 355 326.07 319.40 6.67 0.134
Juglandaceae 264 340.30 339.01 1.29 0.593 936 340.86 338.22 2.64 0.011
Pinaceae 2,815 439.63 438.71 0.91 0.035 1,465 350.83 350.22 0.60 0.015
Rosaceae 728 325.26 319.97 5.28 0.017 439 326.14 318.24 7.90 0.001
(c)
Common
genera
Acer 2,533 338.03 335.94 2.09 < 0.001 1,135 327.97 327.30 0.68 0.959
Pinus 942 369.09 369.59 -0.50 0.551 1,434 347.04 346.39 0.65 0.01
Quercus 1,397 336.46 333.11 3.35 0.001 1,759 351.57 351.94 -0.38 0.15

Notes: PD is measured in millions of years per plot. Significant measures of mean plot-level change over time, based on a Wilcoxon signed rank test, are in bold.


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