Figure 4

Evolution of reproductive isolation in Ascomycetes. a and b show the evolution of presyngamic and postsyngamic isolation in allopatry and sympatry, respectively. Continuous, broken and dotted lines stand for the ‘slowdown’, ‘linear’ and ‘snowball’ model, respectively. For each data set, the best model appears in bold. As data were made of discrete measures of reproductive isolation, model predictions were transformed into a discrete variable (see main text for details).