Ecological Archives M072-001-A3

**Peter B. Pearman. 2002. The scale of community structure: habitat variation and avian guilds in tropical forest understory. Ecological Monographs 72:19-39.**

Appendix C. Principal Component Analysis, eigenvalues, cumulative proportions and eigenvectors associated with variability in primary forest cover within 12 tori around each study site.

Component Eigenvalue Proportion Cumulative

1 9.60367 0.800306 0.80031

2 1.55020 0.129183 0.92949

3 0.37386 0.031155 0.96064

4 0.15351 0.012792 0.97344

5 0.09846 0.008205 0.98164

6 0.07305 0.006088 0.98773

7 0.04763 0.003969 0.99170

8 0.04040 0.003366 0.99506

9 0.02244 0.001870 0.99693

10 0.02160 0.001800 0.99873

11 0.01104 0.000920 0.99965

12 0.00415 0.000346 1.00000

Eigenvector

1 2 3 4

Torus (m)

0 - 35 0.203308 0.555506 0.400206 0.620572

35 - 50 0.229818 0.540319 0.047146 -0.327899

50 - 100 0.278782 0.355034 -0.060515 -0.480699

100 - 200 0.311778 0.108376 -0.152061 -0.202318

200 - 300 0.310611 -0.009812 -0.362922 0.248948

300 - 400 0.302714 -0.096353 -0.458429 0.113945

400 - 500 0.311076 -0.059952 -0.268037 0.320077

500 - 600 0.313938 -0.135022 -0.015865 0.119558

600 - 700 0.301831 -0.202820 0.304328 -0.059652

700 - 800 0.293962 -0.249340 0.355657 -0.126166

800 - 1000 0.282636 -0.302800 0.421441 -0.003102

1000 - 2000 0.300143 -0.188346 -0.011925 -0.155500

Notes: Only the first four eigenvectors are shown. These correspond to over 97% of the variation in primary forest cover within two kilometers of each of 23 study sites.

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`Component`	`Eigenvalue`	`Proportion`	`Cumulative`
`1`	`9.60367`	`0.800306`	`0.80031`
`2`	`1.55020`	`0.129183`	`0.92949`
`3`	`0.37386`	`0.031155`	`0.96064`
`4`	`0.15351`	`0.012792`	`0.97344`
`5`	`0.09846`	`0.008205`	`0.98164`
`6`	`0.07305`	`0.006088`	`0.98773`
`7`	`0.04763`	`0.003969`	`0.99170`
`8`	`0.04040`	`0.003366`	`0.99506`
`9`	`0.02244`	`0.001870`	`0.99693`
`10`	`0.02160`	`0.001800`	`0.99873`
`11`	`0.01104`	`0.000920`	`0.99965`
`12`	`0.00415`	`0.000346`	`1.00000`

`Eigenvector`
	`1`	`2`	`3`	`4`
`Torus (m)`
`0 - 35`	`0.203308`	`0.555506`	`0.400206`	`0.620572`
`35 - 50`	`0.229818`	`0.540319`	`0.047146`	`-0.327899`
`50 - 100`	`0.278782`	`0.355034`	`-0.060515`	`-0.480699`
`100 - 200`	`0.311778`	`0.108376`	`-0.152061`	`-0.202318`
`200 - 300`	`0.310611`	`-0.009812`	`-0.362922`	`0.248948`
`300 - 400`	`0.302714`	`-0.096353`	`-0.458429`	`0.113945`
`400 - 500`	`0.311076`	`-0.059952`	`-0.268037`	`0.320077`
`500 - 600`	`0.313938`	`-0.135022`	`-0.015865`	`0.119558`
`600 - 700`	`0.301831`	`-0.202820`	`0.304328`	`-0.059652`
`700 - 800`	`0.293962`	`-0.249340`	`0.355657`	`-0.126166`
`800 - 1000`	`0.282636`	`-0.302800`	`0.421441`	`-0.003102`
`1000 - 2000`	`0.300143`	`-0.188346`	`-0.011925`	`-0.155500`