Reciprocal diversification in a complex plant-herbivore-parasitoid food web

Table 1 Effects of gall type and sample size (= number of galls collected) on the number of parasitoid species observed attacking each galler species

Source	Type III sum of squares	df	Mean square	F	p Value
Corrected model	592.188*	6	98.698	10.360	<0.001
Intercept	64.579	1	64.579	6.779	0.013
Number of galls	166.368	1	166.368	17.464	<0.001
Gall type	382.832	5	76.566	8.037	<0.001
Error	333.431	35	9.527
Total	5046.000	42
Corrected total	925.619	41

df, degrees of freedom
Gall type was included as a fixed factor and sample size as a covariate in the ANCOVA model. Sample sizes were ln-transformed prior to the analysis, because logarithmic regressions produced more biologically realistic results and a better fit to the observed data (Figure 5A) than did linear regressions with untransformed sample sizes.
*R² = 0.640 (adjusted R² = 0.578).

ISSN: 1741-7007