Ishii Kaori, Hirai Yoshiyuki, Katagiri Chihiro, Kimura Masahito T
Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan.
Zoolog Sci. 2002 Oct;19(10):1191-6. doi: 10.2108/zsj.19.1191.
In Drosophila elegans, two morphs are known, the brown-morph occurring from southern China to Indonesia and the black-morph occurring in the Ryukyu Islands, Japan, and Taiwan, and brown-morph populations at high altitudes in Indonesia at least sympatrically occur with a sibling species D. gunungcola. Sexual isolation has developed between the two morphs of D. elegans to some extent; females of the black-morph have a higher concentration of pentacosenes on cuticle than those of the brown-morph, and males of these morphs discriminate between the females based on this difference. In this study, it was examined whether sympatry and allopatry with D. gunungcola have resulted in the differentiation of mate recognition system in D. elegans. No significant difference was observed in the degree of mate discrimination between a sympatric pair of D. elegans and D. gunungcola and their allopatric pairs. Thus, no support was obtained for the above notion. Males of the brown- and black-morphs of D. elegans discriminate between females of own morphs and D. gunungcola. However, brown-morph males did not discriminate between females of the black-morph and D. gunungcola, and also black-morph males did not discriminate between females of the brown-morph and D. gunungcola. This may be attributed to that D. gunungcola females retained an intermediate level of pentacosenes between brown- and black-morph females.
在秀丽果蝇中，已知有两种形态，棕色形态分布于从中国南部到印度尼西亚的地区，黑色形态分布于日本的琉球群岛和台湾，并且印度尼西亚高海拔地区的棕色形态种群至少与近缘物种贡氏果蝇同域分布。秀丽果蝇的两种形态之间已在一定程度上形成了性隔离；黑色形态的雌性果蝇表皮上的二十五碳烯浓度高于棕色形态的雌性果蝇，并且这些形态的雄性果蝇会基于这种差异来区分雌性果蝇。在本研究中，检测了与贡氏果蝇的同域分布和异域分布是否导致了秀丽果蝇配偶识别系统的分化。在秀丽果蝇和贡氏果蝇的同域配对及其异域配对之间，未观察到配偶辨别程度的显著差异。因此，上述观点未得到支持。秀丽果蝇棕色和黑色形态的雄性果蝇能够区分自身形态的雌性果蝇和贡氏果蝇的雌性果蝇。然而，棕色形态的雄性果蝇无法区分黑色形态的雌性果蝇和贡氏果蝇的雌性果蝇，黑色形态的雄性果蝇也无法区分棕色形态的雌性果蝇和贡氏果蝇的雌性果蝇。这可能是由于贡氏果蝇的雌性果蝇表皮上的二十五碳烯浓度处于棕色和黑色形态雌性果蝇之间的中间水平。
