Figure 3.

Graphic to show the most likely DIYABC lineage diversification/island colonization scenario for genetic lineages and populations of Pristionchus pacificus, based on STR and mt markers. In the final analysis, the overall best scenario (of 24 possibilities; see Fig. S1) corresponded to a lineage diversification (lineages A, B, C, and D, diverging away from an unsampled source population, “U”) order of: U>D/A>C>B at times t₅–t₈, and an island colonization (sub-populations a, b, c, and d, diverging away from their respective lineages) order of: c>a>b>d, occurring at times t₁–t₄. The island colonization was modeled by following the divergence of the island population away from the ancestral lineage with an immediate decrease in population size (i.e. a foundation bottleneck). The bottleneck is represented in the graphic as a magenta break upon the colonization arrows, and the bottleneck duration is the same for each population (db = 5 generations). In the graphic, the time axis is to relative scale only. Refer to Methods and Results for further information.