Table 2.
Summary of models predicting abundance of Aphis fabae (BB) and Acyrthosiphon pisum (PA) and the occurrence of predators and ants found on colonies of each aphid species as response variables, and proportion of habitat types, plant richness and aphid species, predators and ants as explanatory variables.
Model ID | AIC | Response variable | Explanatory variable | Coefficient value ± SE | P |
---|---|---|---|---|---|
1 | 304.6 | PA aphid | Intercept | 1.103 ± 0.196 | 0.0000 |
Presence of predators | 0.556 ± 0.090 | 0.0000 | |||
Proportion of buildings | 0.549 ± 0.346 | 0.1152 | |||
2 | 279.4 | BB aphid | Intercept | 1.862 ± 0.185 | 0.0000 |
Presence of predators | 0.188 ± 0.078 | 0.0165 | |||
Presence of ants | 0.440 ± 0.078 | 0.0000 | |||
Plant richness | −0.003 ± 0.002 | 0.1151 | |||
Proportion of buildings | 0.557 ± 0.316 | 0.0796 | |||
3 | 182.9 | PA predators | Intercept | −1.101 ± 0.551 | 0.0457 |
PA aphid | 1.664 ± 0.551 | 0.0000 | |||
Presence of ants | −1.341 ± 0.502 | 0.0076 | |||
Proportion of buildings | −3.320 ± 1.743 | 0.0568 | |||
4 | 212.2 | BB predators | Intercept | 0.342 ± 0.638 | 0.5920 |
BB aphid | 0.790 ± 0.316 | 0.0124 | |||
Presence of ants | −1.119 ± 0.407 | 0.0060 | |||
Proportion of roads | −2.120 ± 0.926 | 0.0221 | |||
5 | 163.3 | PA ants | Intercept | −1.545 ± 0.420 | 0.0002 |
Presence of predators | −1.147 ± 0.450 | 0.0108 | |||
Proportion of buildings | 5.169 ± 1.682 | 0.0021 | |||
6 | 185.9 | BB ants | Intercept | −6.627 ± 1.229 | 0.0000 |
BB aphid | 2.087 ± 0.419 | 0.0000 | |||
Presence of predators | −0.888 ± 0.408 | 0.0294 | |||
Plant richness | 0.036 ± 0.011 | 0.0015 | |||
Proportion of roads | 2.042 ± 1.013 | 0.0438 |
AIC values for each model are given. Models with significant explanatory factors are shown in bold.