Table 3. Analysis of variance.

Source of variation	χ2 deviance	d.f.	P	r2	r2 (removing effect of area)
Area	936.0	1	<0.0001	0.85
Habitat diversity	57.8	1	<0.0001	0.05	0.34
Seabird rookery	38.1	1	<0.0001	0.03	0.23
Island type	34.5	1	<0.0001	0.03	0.21
Topography	24.1	2	<0.0001	0.02	0.14
Residuals	13.2	7	0.07	0.01	0.08
Total	1,103.6	13

Note:

Results for the factors of diversity identified to significantly account for the variation from expected plant species diversity.