Domain of parasitoid extinction (black) and persistence (white) as a function of parasitoid searching efficiency (<i>a</i>) and host finite rate of increase (<i>λ</i>) for three intensities of a mate-finding Allee effect: no Allee effect (<i>α</i> = 0), mild effects (<i>α</i> = 5), strong effects (<i>α</i> = 20).

<p>Other assumptions are a random distribution of parasitoid attacks (<i>k</i> = 10) and a medium intraspecific competition in the host population (<i>b</i> = 1.5). Two different domains of extinction can be distinguished: the upper domain corresponding to high parasitoid efficiency and low host finite rate of increase and the lower domain, corresponding to low parasitoid efficiency and high host finite rate of increase.