Fig. 2.

Predicted and observed pattern of stalk investment in three-strain groups. The ternary plot shows the total (collective) level of investment by a group as a function of group composition in terms of the relatedness of the three strains to the group ($r_1$,$r_2$, and $r_3$), which is equal to their frequencies in the group). (A) The predicted level of collective investment in stalk is indicated by the shading from yellow (high investment) to red (low investment). (B) Empirically measured investment in groups across a range of compositions, where each circle indicates the mean investment (calculated from n = 20 replicates) by groups with a given composition (where relative investment is inferred from the numbers of spores produced by clonal relative to chimeric groups). Shading matches that for A.