Mark C. Urban. 2004. Disturbance heterogeneity determines freshwater metacommunity structure. Ecology 85:2971–2978.

Appendix A. A table documenting among-pond environmental variation.

Table A1. Pond permanence, habitat characteristics, and their loadings on PC1.

Pond ID	PC1 scores	Permanence	Loge Area (m2)	Max. Depth (cm)	Percent Vegetation structure	Percent canopy cover	Total habitat diversity
t-1	-1.84	0	0.78	24	0	77	2
t-2	-0.33	9	2.18	26	8	93	2
t-5	1.58	14	2.85	40	20	79	4
u-4	4.14	19	3.78	27	51	19	7
v-2	1.07	14	2.84	52	5	80	3
w-1	-0.83	2	3.31	43	0	100	2
w-4	-1.61	1	2.33	25	0	100	2
x-7	2.40	14	3.92	29	45	49	3
x-8	-1.46	1	2.40	30	3	100	1
x-9	2.36	14	3.29	80	34	61	2
y-3	0.08	2	2.37	39	8	20	1
y-4	-2.73	0	0.78	17	0	100	1
y-7	-2.33	0	0.95	20	0	93	1
z-5	-0.49	0	2.83	29	10	89	2
PC1 factor loadings	--	0.471	0.422	0.25	0.477	-0.381	0.405
Correlation with permanence	0.93	--	0.69	0.46	0.84†	-0.59†	0.78

   Notes: Permanence measured as weeks after sampling with visible water. See text for details of data collection.

^† Correlation coefficients calculated after transformation of percent vegetation structure and canopy cover by arcsin transformation .