Some Hawaiian cricket populations are losing the ability to sing. Males on Oahu invest more in sperm competition than males on Kauai by making more sperm and packing more proteins to increase sperm viability and slow female remating:
@jessiectanner.bsky.social et al. (2025)
doi.org/10.1093/jeb/...
Ejaculate investment differs by population, but not wing morph or perceived sperm competition risk, in Pacific field crickets
Abstract. Conspicuous sexual signals are frequently under selection from conflicting sources, such as natural versus sexual selection and precopulatory ver
