Abstract
Kaneshiro (1976) observed asymmetrical sexual isolation among the Hawaiian Drosophila planitibia subgroup of flies, and suggested a model of evolution of sexual behavior wherein females of putative ancestral species are sexually more isolated from males of derived species than are females of derived species from males of the ancestral species. The model has subsequently been expanded and new, allegedly supportive data presented (Kaneshiro, 1980, 1983; Ohta, 1978; Arita and Kaneshiro, 1979; Ahearn, 1980; Kaneshiro and Kurihara, 1981; Dodd and Powell, 1985). Ostensibly, the Kaneshiro model provides a reasonable explanation of asymmetrical sexual isolation, which may result from several underlying genetic mechanisms. Kaneshiro (1976) suggested that during a new invasion of a previously uninhabited locality, genetic drift acting upon a small number of migrants may cause the loss of several facets of male courtship behavior. Ancestral females would then be relatively unwilling to accept behaviorally deficient males. Derived females would accept these males as well as ancestral ones whose courtship pattern included all that was still present in the derived males. Ohta (1978), studying yet another group of Hawaiian flies, showed that derived females had a higher sex drive and were more receptive to all males than were ancestral females. Perhaps in a small migrant population, where encounters between flies might be relatively rare events, those females that had a strong sex drive would have been selected for because they were more likely to mate than those females that were innately slower to mate. This scenario could lead to the loss of selection for the complete courtship pattern, particularly if there were no other closely related species present in the newer locality.
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© 1987 Plenum Press, New York
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Ehrman, L., Wasserman, M. (1987). The Significance of Asymmetrical Sexual Isolation. In: Hecht, M.K., Wallace, B., Prance, G.T. (eds) Evolutionary Biology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6986-2_1
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