939862.fig.001a
(a)
939862.fig.001b
(b)
939862.fig.001c
(c)
939862.fig.001d
(d)
Figure 1: An illustration of several patterns in which multiple independent transitions to a new environment are coupled with speciation. The yellow and green boxes represent two different environments, the arrows represent multiple independent transitions between the environments, and the closed shapes represent reproductively compatible groups. Only panel (a) represents parallel ecological speciation, the process we are interested in.