Persistence (a) and distribution of extinction dates (b) as a function of host regime and probability of vertical transmission in the host (<i>g_H</i>).

<p>b) in black, persistence. In shades of grey, from darkest to lightest, extinction the 5th, 4th, 3rd year after introduction, respectively. In white, extinction the 2nd year. In marble, extinction the 1st year.