Figure 4.
Behavioural response of C. clypeatus to natural and synthetic odourants in a two-choice bioassay. Different natural and synthetic odourants (light grey, crabs to treatment; with and without 10 ml distilled water, W) were tested against an empty control, water and/or solvent (S) (black, crabs to control). Two empty controls were used as negative control (top bars). Synthetic odourants were presented at 10−2 dilutions in mineral oil. (G-test, * p < 0.05, ** p < 0.01, *** p < 0.001, n indicated to the right for each test.)