New research reveals that Hawaii's songless crickets, known as Teleogryllus oceanicus, have rapidly adapted across the Hawaiian islands since their first observation in 2003. This study, presented at the Society for Experimental Biology conference in July 2026, highlights how these crickets have developed unique sound-reducing morphs, enabling them to overcome reproductive challenges.
Rapid Adaptation of Hawaiian Crickets
The silent male crickets, termed flatwing morphs, lack wing structures necessary for producing courtship songs. This adaptation has allowed them to thrive despite the reproductive challenges they face. The phenomenon was first identified on Kauaʻi and has since spread to the southeastern islands due to the pressure from the parasitoid fly, Ormia ochracea.
“Multiple other sound-reducing morphs have also recently evolved, suggesting rapidly evolving underlying gene regulatory networks,” says Jae Walker, a Ph.D. student from the University of St Andrews. Walker likens these adaptations to “the acoustic equivalent of invisibility powers!”
Implications of Developmental Changes
The study found that flatwing males mature into adults approximately one week faster than their singing counterparts. This accelerated development provides them with increased opportunities to find mates through alternative methods, despite their inability to attract females with song. “This suggests that a developmental trade-off allows the non-singing males to overcome the advantage lost from their inability to call mates to them,” Walker explains.
