Figure 1.

(a) Colonies containing 40% bold spiders experienced the greatest incidence of colony-wide bacterial transmission. That is, the proportion of spiders from which fluorescent Pantoea was collected was greatest in colonies of 40% bold spiders, regardless of the behavioural type of the index case. Colony compositions with different letter headings denote statistically different values. (b) Colonies containing all shy spiders were more likely to be found in physical contact with the index case, *p < 0.05, **p < 0.01.