Figure 1

The cross-fostering experiment set-up. Fungus gardens and pupae from four source colonies were used to set up 32 subcolonies in a duplicated (4x4) fully crossed design. Source colony identity is indicated by color, with blue used for colonies with Pseudonocardia phylotype 1 (Ps1) and red/orange for colonies with Pseudonocardia phylotype 2 (Ps2). Pupae from each source colony eclosed in two replicate subcolonies with either a garden fragment and nurse workers from their own colony (e.g. light blue pupae in light blue garden), or a garden fragment and nurse workers from a colony with the same Pseudonocardia phylotype (e.g. light blue pupae in dark blue garden), or a garden fragment and nurse workers from two colonies with the other Pseudonocardia phylotype (e.g. light blue pupae in red and orange gardens). Drawing of pupae from http://etc.usf.edu/clipart.