Table 1 Functional response of H. axyridis on C. juglandicola and P. juglandis under four different temperature regimes
Aphids | Temp. (°C) | Attacking efficiency (a) | Handling time Th (d) | Predation capacity a/Th | Maximum predation number 1/Th | Holling’s type II equation | R2 |
|---|---|---|---|---|---|---|---|
C. juglandicola | 15 | 0.7944 | 0.0031 | 256.2604 | 322.5806 | Na = 0.7944N/(1 + 0.0025N) | 0.8756 |
20 | 0.9169 | 0.0021 | 434.5543 | 473.9336 | Na = 0.9169N/(1 + 0.0019N) | 0.9821 | |
25 | 1.0158 | 0.0020 | 495.5050 | 487.8049 | Na = 1.0158N/(1 + 0.0021N) | 0.9964 | |
30 | 1.0862 | 0.0019 | 565.7481 | 520.8333 | Na = 1.0862N/(1 + 0.0021N) | 0.9923 | |
P. juglandis | 15 | 0.5798 | 0.0075 | 77.2065 | 133.1558 | Na = 0.5798N/(1 + 0.0044N) | 0.9641 |
20 | 0.8034 | 0.0042 | 189.4811 | 235.8491 | Na = 0.8034N/(1 + 0.0034N) | 0.9969 | |
25 | 0.8386 | 0.0035 | 236.8973 | 282.4859 | Na = 0.8386N/(1 + 0.0030N) | 0.9978 | |
30 | 0.8468 | 0.0029 | 293.0194 | 346.0208 | Na = 0.8468N/(1 + 0.0024N) | 0.9923 |