Laskri Sophia, Holmes Lewis B, Dixon Thomas, Robillard Tony, Montealegre-Z Fernando
School of Life and Environmental Sciences, Green Lane, Lincoln LN6 7DL, UK.
Institut UniLaSalle, Mont-Saint-Aignan 76130, France.
R Soc Open Sci. 2024 Dec 18;11(12):241147. doi: 10.1098/rsos.241147. eCollection 2024 Dec.
Male crickets sing to attract females for mating. Sound is produced by tegminal stridulation, where one wing bears a plectrum and the other a wing vein modified with cuticular teeth. The carrier frequency ( ) of the call is dictated by the wing resonance and the rate of tooth strikes. Therefore, the varies across species due to the size of the vibrating membranes on the wings and/or the speed of tooth strikes. But how well is the resonant frequency ( ) conserved in dried preserved specimens? This project is designed to investigate the gradual change in cricket wing over time and aims to produce equations that help to predict or recover the original natural frequency of wing vibration in dry-preserved crickets and allies. Using laser Doppler vibrometry, we scanned the wings of living specimens to determine their . The specimens were then preserved, allowing us to continue measuring the wings as they desiccate. We found that after the first week, increases steeply, reaching a plateau and stabilizing for the following months. We go on to propose a model that can be used to recover the original of the wings of preserved Ensifera that use pure tones for communication. Models were corroborated using preserved specimens previously recorded and mounted in dry collections for more than 10 years.
雄性蟋蟀通过鸣叫来吸引雌性进行交配。声音是由翅摩擦产生的，其中一只翅膀带有一个音锉，另一只翅膀有一条经过角质化齿修饰的翅脉。鸣叫的载波频率（ ）由翅膀的共振和齿击频率决定。因此，由于翅膀上振动膜的大小和/或齿击速度的不同，载波频率在不同物种间存在差异。但是，在干燥保存的标本中，共振频率（ ）的保存情况如何呢？本项目旨在研究蟋蟀翅膀的共振频率随时间的逐渐变化，并致力于得出有助于预测或恢复干燥保存的蟋蟀及其近缘物种翅膀原始自然振动频率的方程。我们使用激光多普勒测振仪扫描活体标本的翅膀以确定其共振频率。然后将标本保存起来，以便在它们干燥的过程中继续测量翅膀的共振频率。我们发现，在第一周后，共振频率急剧增加，达到一个平稳状态并在接下来的几个月保持稳定。我们进而提出了一个模型，该模型可用于恢复使用纯音进行交流的直翅目昆虫保存标本翅膀的原始共振频率。我们使用先前记录并保存在干燥标本馆中超过10年的标本对模型进行了验证。
