Appendix C. The effects of aphid density, ants, and plant genotype on the final number of aphids per plant.
TABLE C1. The effects of initial aphid density, the presence/absence of ants, and plant genotype on the final number of aphids per plant. Spatial block and the person who counted aphids on a plant (counter) were included as blocking factors. I calculated the percent variation (% Var) explained by all main effects and significant interactions using general linear models using the equation: (factorsums of squares)/(total sums of squares) × 100%. The variance components (VC) for all random effects are also provided. Significant effects (P < 0.05) are in bold.
Source 
VC 
F/ 
P 
% Var 
Initial density (density)^{†} 
76.52 
<0.001 
6 

Ants^{†} 
9.14 
0.003 
0.8 

Genotype 
0.84 
31.3 
<0.001 
27.1 
Block 
0.1 
22.1 
<0.001 
2.3 
Counter^{†} 
1.12 
0.33 
0.6 

Density × Ants^{†} 
5.47 
0.02 
0.5 

Density × genotype 
<0.01 
0 
 
 
Ants × genotype 
0.03 
0.5 
0.24 
 
Ants × counter^{†} 
3.55 
0.03 
0.2 

Density × ants × counter^{†} 
2.18 
0.07 
 

Residual 
1.99 

^{†} Denotes fixed effect in which the significance was assessed using an F statistic. All other effects in the model were random and their significance was tested using astatistic from loglikelihood ratio tests.