Reproductive success of tsetse–<i>Wolbachia</i> crosses.

Shown are the relative reproductive rates resulting from tsetse–Wolbachia mating crosses, relative to the cross between a non-colonized female and a non-colonized male. All viable offspring are listed as a result of each mating cross. Parameters governing the reproductive rates of each mating are: , the relative egg-count increase due to Wolbachia colonization; , the proportion of eggs of Wolbachia-colonized females that are non-colonized; and , the proportion of fertilizations of colonized eggs by non-colonized sperm that are not viable due to CI [9]. Non-colonized females can only produce non-colonized offspring, whereas colonized females can produce both colonized and non-colonized offspring.