Vol. 46 No. 5, 2007
Asymmetrical Reproductive Isolation between Drosophila albomicans and D. nasuta
Hwei-yu Chang1,2,* and Yu-Ta Tai1
1Department of Entomology, National Taiwan University, Taipei 106, Taiwan
2Research Center for Biodiversity, Academia Sinica, Nankang, Taipei 115, Taiwan
Hwei-yu Chang and Yu-Ta Tai (2007) The species status of the taxa, Drosophila albomicans and D. nasuta, has been an issue because no obvious reproductive isolation has been reported. For both D. albomicans and D. nasuta
females, although the mating speeds differed in the single-choice
mating tests, without time limitation the successful mating percentage
of intraspecific crosses was the same as that of interspecific ones.
However, by comparing“multiple-choice”,“dual-choice”,
and“single-choice”experiments, there is evidence for female mating
preference and male-male interactions in D. albomicans. These 2 components of sexual selection were not observed in D. nasuta. The implication of this asymmetrical premating sexual behavior in D. albomicans on the speciation history of this species is discussed.
Key words: Behavior, Evolution, Female choice, Lek, Male interference.