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
(a) Plant divisions	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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