Rapid sexual signal diversification is facilitated by permissive females
Rapid sexual signal diversification is facilitated by permissive females
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DOI：
10.1016/j.cub.2023.11.063
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发表时间：
2024-01-22
期刊：
影响因子：
9.2
通讯作者：
Bailey，Nathan W.
中科院分区：
文献类型：
--
作者：
Zhang，Renjie;Rayner，Jack G.;Bailey，Nathan W.
新的性信号进化的最初过程仍然不清楚，因为罕见的新变体容易因漂移或普遍的雌性偏好所施加的反选择而丢失。1，2，3，4我们描述了夏威夷种群中的雄性求爱信号的多样化。这是由短翅型翅膀的进化带来的（“小翼”）只有6年前。5小翼有一个遗传基础，并导致沉默或降低幅度的信号，通过使男性前翅，我们发现，翅膀的减少显着增加求爱歌曲的基本频率从平均5.1 kHz到6.4 kHz。它还使男性歌曲去渠道化，拓宽了正常歌曲特征空间之外的峰值信号频率范围。由于求偶歌提示女性安装和性选择，6，7，8，9我们评估了两种情况下，以测试这些新的信号值的命运。女性可能会表现出减少接受小翼男性，通过普遍的偏好强加反选择。或者，女性可能会接受小翼男性容易长翼男性，如果他们的窗口的偏好是足够宽。我们的结果支持后者。雌性更喜欢那些能发出某种信号的雄性，但它们经常安装能发出声音的小翅膀雄性和能发出声音的长翅膀雄性。不分青红皂白的交配可以促进罕见的新信号值的持续存在。如果雌性的放纵是性信号进化的最早阶段的一个普遍特征，那么具有低雌性配偶接受阈值的类群应该更容易通过性选择而多样化。视频摘要
The initial process by which novel sexual signals evolve remains unclear, because rare new variants are susceptible to loss by drift or counterselection imposed by prevailing female preferences.1,2,3,4We describe the diversification of an acoustic male courtship signal in Hawaiian populations of the field cricketTeleogryllus oceanicus, which was brought about by the evolution of a brachypterous wing morph ("small-wing") only 6 years ago.5Small-wing has a genetic basis and causes silence or reduced-amplitude signaling by miniaturizing male forewings, conferring protection against an eavesdropping parasitoid,Ormia ochracea.5We found that wing reduction notably increases the fundamental frequency of courtship song from an average of 5.1 kHz to 6.4 kHz. It also de-canalizes male song, broadening the range of peak signal frequencies well outside normal song character space. As courtship song prompts female mounting and is sexually selected,6,7,8,9we evaluated two scenarios to test the fate of these new signal values. Females might show reduced acceptance of small-wing males, imposing counterselection via prevailing preferences. Alternatively, females might accept small-wing males as readily as long-wing males if their window of preference is sufficiently wide. Our results support the latter. Females preferred males who produced some signal over none, but they mounted sound-producing small-wing males as often as sound-producing long-wing males. Indiscriminate mating can facilitate the persistence of rare, novel signal values. If female permissiveness is a general characteristic of the earliest stages of sexual signal evolution, then taxa with low female mate acceptance thresholds should be more prone to diversification via sexual selection.Video abstract