Saarikettu M, Liimatainen J O, Hoikkala A
Department of Genetics, University of Oulu, Oulu, Finland.
Behav Genet. 2005 May;35(3):257-63. doi: 10.1007/s10519-005-3218-z.
In many Drosophila species the male courtship song is an essential part of a successful courtship, playing a role in species-recognition and/or in sexual selection exercised by the females on conspecific males. In Drosophila montana, specific traits of the courtship song (the length and the carrier frequency of sound pulses) have earlier been shown to play an important role in intraspecific mate choice. Here we show that the male song (especially the interpulse interval) also plays a role in species-recognition, maintaining sexual isolation between sympatric species. We succeeded in breaking down sexual isolation between D. montana females and D. lummei males by playing the females simulated courtship song with a species-specific interpulse interval while they were courted by a mute (wingless) male. Involvement of different song traits in intra- and interspecific mate choice suggests that the song may be affected by both directional and stabilizing selection.
在许多果蝇物种中，雄性求偶歌是成功求偶的重要组成部分，在物种识别和/或雌性对同种雄性进行的性选择中发挥作用。在蒙大拿果蝇中，求偶歌的特定特征（声脉冲的长度和载波频率）早前已被证明在种内配偶选择中发挥重要作用。在此我们表明，雄性歌声（尤其是脉冲间隔）在物种识别中也发挥作用，维持着同域物种之间的性隔离。我们通过在雌性被无翅雄性求偶时，播放具有物种特异性脉冲间隔的模拟求偶歌，成功打破了蒙大拿果蝇雌性与鲁氏果蝇雄性之间的性隔离。不同歌声特征在种内和种间配偶选择中的作用表明，歌声可能受到定向选择和稳定选择的双重影响。
