Courtship Behavior and Control of Reproductive Isolation Between Drosophila mojavensis and Drosophila arizonensis

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Abstract
Behavioral control of interspecific courtships between D. mojavensis and its sibling species D. arizonensis was analyzed in the laboratory using flies from regions where the 2 spp. occur allopatrically and sympatrically. The asymmetry seen for sexual isolation between D. arizonensis and D. mojavensis can be traced to behavioral interactions at several stages of courtship. Evidence indicates that males exercise precourtship discrimination under laboratory conditions. The existence of factors influencing male courtship interest and female receptivity is also implicated. Character displacement appears to be occurring for behaviors operating before and during courtship when flies are from sympatric populations.

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