For example, reproductive isolation is weak in the early stages of speciation, but changes to strong ... of similar age (Funk 1998). Figure 4 illustrates an example that supports this prediction.

For example, reproductive isolation is weak in the early stages of speciation, but changes to strong ... of similar age (Funk 1998). Figure 4 illustrates an example that supports this prediction.

Both in present and past taxa, speciation unfolds across space and time, through multiple stages involving the incremental ...