Behavioral Sequence Leading to Sexual Isolation Between <Emphasis Type="Italic">Drosophila ananassae</Emphasis> and <Emphasis Type="Italic">D. pallidosa</Emphasis> |
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Authors: | Hirokazu Yamada Masatoshi Tomaru Muneo Matsuda Yuzuru Oguma |
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Institution: | (1) Institute of Biological Sciences, University of Tsukuba, Tsukuba Ibaraki, 305-8572, Japan;(2) Drosophila Genetic Resource Center, Kyoto Institute of Technology, Saga Ippongi-cho, Ukyo-ku Kyoto, 616-8354, Japan;(3) Department of Biology, School of Medicine, Kyorin University, 6-20-2 Shinkawa, Mitaka Tokyo, 181-8611, Japan;(4) Program for Genetic Resource Education and Development, Drosophila Genetic Resource Center, Kyoto Institute of Technology, Saga Ippongi-cho, Ukyo-ku Kyoto, 616-8354, Japan |
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Abstract: | Drosophila ananassae and D. pallidosa are closely related, sympatric species that lack postmating isolation. Sexual isolation has been considered important in
maintaining them as independent species. To clarify the behavioral processes leading to sexual isolation, we analyzed behavioral
sequences and examined the effect of courtship song on mating success and on behaviors of both sexes by surgically removing
male wings (song generators), female aristae (song receivers), or female wings (means of fluttering). We found that heterospecific
courtship songs evoked female wing fluttering, whereas conspecific courtship song did not. Furthermore, female wing fluttering
made courting males discontinue courtship. These findings suggest that strong sexual isolation is achieved through the following
behavioral sequence: heterospecific song→female wing fluttering→courtship discontinuation. |
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Keywords: | Drosophila ananassae Drosophila pallidosa sexual isolation speciation courtship song female rejection |
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