Does Asymmetrical Mating Preference Show the Direction of Evolution?

RARE MALE MATING DISADVANTAGE IN DROSOPHILA MELANOGASTER

“…However, a "one-sided mating preference" did exist, for both the w/w and +/w females mated significantly more often with + than w males. Such "one-sided" or "asymmetrical" mating preferences have sometimes been interpreted as having some bearing on sexual isolation (Kaneshiro, 1976;Watanabe and Kawanishi, 1979;Wasserman and Koepfer, 1980), but such cases may merely reflect differences in mating propensities by the males or females, that is, selective mating, rather than sexual isolation. Although significant indices of sexual isolation may be found in cases of onesided mating preferences, they may be spurious if selective mating is involved, and an analysis of data based solely on isolation indices is incomplete.…”

FOUNDER‐FLUSH SPECIATION: AN UPDATE OF EXPERIMENTAL RESULTS WITH DROSOPHILA

“…This theory has received support from Kaneshiro's observations on Hawaiian Drosophila. It has also stimulated much discussion (reviewed in Giddings and Templeton, 1983) as well as counter theories (Watanabe and Kawanishi, 1979;Wasserman and Koepfer, 1980). If this is indeed the predominant speciation mechanism in Hawaiian Drosophila, then the process must occur relatively rapidly to account for so many species in such short geological time.…”

Origin of sexual isolation in Drosophila ananassae due to founder effects

“…Some studies have indicated that there is no correlation between asymmetrical mate choice and polarity of mating behaviour (Wassermen and Koepfer 1980;Markow 1981;Moodie 1982;Koepfer 1991), except that Kaneshiro (1976) and Watanabe and Kawanishi (1979) proposed the opposite. There are two hypotheses with respect to asymmetrical reproductive isolation.…”