Table 1.
Colour characteristics of artificial traps, artificial traps on artificial backgrounds and D. rotundifolia leaves.
| colour (CIELAB a*)a |
colour difference (ΔE76)b |
||||||
|---|---|---|---|---|---|---|---|
| min. | max. | mean | min. | max. | mean | ||
| D. rotundifolia traps | −12.1 | 47.5 | 22.7 | 10.2 | 56.2 | 32.9 | |
| D. rotundifolia background | −12.2 | 24.6 | −1.0 | — | — | — | |
| artificial traps on natural background | red | 14.7 | 45.1 | 27.2 | 34.6 | 67.4 | 46.6 |
| green | −15.1 | −6.4 | −10.4 | 18.0 | 73.8 | 56.2 | |
| clear | −3.2 | 5.8 | 0.6 | 18.6 | 60.5 | 46.7 | |
| artificial traps on artificial background | red on green | −11.5 (background colour) | 43.8 | 53.8 | 48.8 | ||
| red on red | 43.1 (background colour) | 10.1 | 12.9 | 11.7 | |||
| green on green | −11.5 (background colour) | 7.6 | 11.6 | 9.2 | |||
| green on red | 43.1 (background colour) | 65.5 | 71.3 | 69.0 | |||
anegative values indicate a green coloration, and positive a red coloration.
blarger values indicate greater colour contrasts.