Behavioural analyses of V. destructor females (N = 32) maintained in artificial arenas with a PBS bubble and a PBS discoid membrane. The first three boxplots show the ratios of the proportion of time spent (in %), the number of stops, the duration of stops (in seconds) weighed by the surface of each zone of the arena (in cm²). The frequency of pulse (/min) was also analysed by zone and is displayed on the fourth boxplot. The diamond points show the mean value. The four parameters all differed significantly between the zones considered (Table 2).