Ticking time: How does aging affect tympanal organ integrity in female crickets? A descriptive study

The perception of acoustic signals is crucial for mate selection and reproductive success in crickets. While the tympanal organs on the fore tibia play a key role in this process, little is known about how aging affects their structural integrity. This study investigated age-related wear on the tympanal organs of female Gryllus (Gryllus) assimilis (Fabricius, 1775), comparing young and older adults. We hypothesized that structural degradation of the posterior tympanal membrane (PTM) increases with age, potentially impairing auditory perception. To test this, we conducted an ultrastructural analysis of tympanal damage using scanning electron microscopy. Our results describe a deterioration of the PTM, including excrescence, plaque formation, fungal agglomerates, cracks, and perforations. Additionally, a reduction in the integrity of the surrounding sensory hairs was observed. These findings demonstrate that aging significantly affects the PTM structure in female field cricket, which may ultimately compromise the cricket’s ability to accurately perceive and respond to acoustic cues. Understanding tympanal wear offers valuable insights into the broader impacts of aging on auditory systems. Future research should explore the relationship between tympanal degradation and reproductive success, as well as investigate cellular-level changes using techniques such as transmission electron microscopy.