Female Fruit Flies Produce Acoustic Signals to Reject Immature Courtship
Researchers have discovered that immature Drosophila females produce distinctive wing-flick sounds in response to male courtship, effectively signaling their sexual unavailability. These acoustic signals are generated by specific neurons also involved in mature female receptivity, and the sounds resemble those made by males during aggressive interactions. The finding reveals a previously unknown juvenile signaling behavior that reduces wasted reproductive effort for both sexes.
A new study published on bioRxiv shows that sexually immature female Drosophila fruit flies engage in a transient acoustic signaling behavior — rapid wing flicks — when exposed to male courtship during the period following metamorphosis before they are reproductively ready. The wing flicks are dependent on male courtship stimuli and require the activity of Doublesex (Dsx)-expressing pC1a neurons in the central brain, the same neurons that later mediate receptivity in mature virgin females. The sound pulses produced by these flicks form patterned trains that are distinct from other known Drosophila acoustic signals but closely resemble pulses generated during male-male agonistic encounters. When courting males were exposed to these immature female wing flicks, they shortened their courtship songs and refrained from attempting copulation. The authors interpret this behavior as an adaptive rejection signal that minimizes futile mating pursuits during a developmental window when reproduction is not yet possible.
What's missing
As a preprint, this study has not yet undergone formal peer review, so findings should be treated as preliminary. The study does not address whether this signaling behavior generalizes beyond laboratory conditions or to Drosophila species other than those tested. It is also unclear whether males have evolved specific sensory or neural machinery to detect and respond to these immature female signals, or whether the response is a byproduct of sensitivity to male agonistic sounds.
What different sources said
- bioRxivCenter
Female acoustic signaling of sexual immaturity depresses male courtship in Drosophila
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