Fig. 1

Desiccation tolerance and the proportion of horizontally transferred genes in four species of Rotaria. Left, blue: the proportion of individuals surviving desiccation and rehydration per species. Error bars show 95 % binomial confidence intervals. Right, red: the proportion of foreign genes with h U ≥30 with respect to the total number of transcripts analyzed per species. Note that the axis starts at proportion of 0.08, not 0, in order to display variation among species