In acoustically communicating bushcrickets (Orthoptera: Tettigoniidae), most signal properties are influenced by the dimensions of the stridulatory apparatus, which in turn reflects body size and condition of the signaller. Females can assess male quality based on acoustic signals, suggesting that male stridulatory structures may be under sexual selection. We investigated scaling relationships between stridulatory structures, body size and body mass in males of the bushcricket Poecilimon veluchianus veluchianus, in comparison to the congeneric Poecilimon ampliatus. Stridulatory structures in P. v. veluchianus exhibited strong left–right correlation and coupling with body size and mass, indicating stabilizing selection for functional integration. In addition, sound-generating (the width of stridulatory teeth) and sound-radiating (mirror area on the right tegmen) structures scaled hyperallometrically to tegmen area, suggesting that both are under sexual selection. Finally, interspecies comparison revealed a steeper slope in tegmen area and stridulatory file length in relation to body size in P. ampliatus than in P. v. veluchianus, implying stronger sexual selection in the former, smaller species. Our study emphasizes the significance of a comparative allometric approach in elucidating evolutionary patterns of sound-generating and -radiating structures.

中文翻译：

---

两个灌木bush物种（直翅目：Tettigoniidae）的异速缩放表明在歌曲生成结构上的有性选择

在声学上沟通的bush（直翅目：Tettigoniidae）中，大多数信号特性会受到阻音设备尺寸的影响，反过来又会反映出人体大小和发讯者的状况。女性可以根据声音信号评估男性素质，这表明男性的节律性结构可能处于性选择之下。我们调查了cri类Po实男性的str突结构，体型和体重之间的比例关系，与同类Po实相比。P. v。veluchianus的阶梯状结构表现出很强的左右相关性，并与身体大小和质量相关联，表明功能选择稳定。此外，发声（发颤齿的宽度）和发声（右脚后跟镜面）的结构与脚后跟部位呈超高角度缩放关系，表明两者均处于性选择之下。最后，种间比较显示，与P. v。veluchianus相比，P。ampliatus的eg茎区域和刺突长度相对于体型的斜率更大，这意味着在较小的前一种物种中，性别选择更强。我们的研究强调了比较变构法在阐明声音产生和辐射结构的演化模式中的重要性。