# Food odour gates courtship in the fruit fly Drosophila erecta, and group motion amplifies male arousal

- Published: 2026-11-05 19:13 UTC
- Section: Life & Health › Biology & biochemistry
- Tags: Drosophila erecta, fruit fly courtship, food odour, sexual arousal, visual feedback loop, Drosophila melanogaster, olfactory circuits, collective behaviour, mating behaviour
- URL: https://realtech.media/news/rt-774396a96cd8dbbe92cf3c66_food_odour_gates/

**In Drosophila erecta, mating depends on food volatiles and on the motion of other flies; in the related D. melanogaster, courtship proceeds vigorously without them.**

![Food odour gates courtship in the fruit fly Drosophila erecta, and group motion amplifies male arousal](https://sgzwpqqelzmajkcubgkl.supabase.co/storage/v1/object/public/rt-media/2026/11/573026cba9d95c70.jpg)
*focus.it*

Researchers studying the fruit fly Drosophila erecta report in Nature that mating in this species is strictly contingent on the ecological and social environment created when flies aggregate densely on a food patch [1]. Food volatiles directly raise male sexual arousal, so males sample and pursue potential mates, which produces dynamic interactions across the group [1]. In the experiments, males were placed alone or with other flies, in air with apple cider vinegar odour (imitating fermenting fruit) or without odour.

## Food odour as a sensory gate

Without the odour, D. erecta males stayed motionless and showed no interest in other flies. With vinegar odour they courted intensely any nearby fly, male or female, until they found a partner. Nine of ten matings took place in the zone where the vinegar had been sprayed.

In D. melanogaster, food odour can promote arousal [1], but it is dispensable for vigorous courtship [1]. In the experiments, these flies mated both with and without vinegar odour and spread evenly over the available space. Comparative circuit analyses show that species-specific thresholds for sexual arousal reflect variation in how olfactory input modulates conserved nodes controlling courtship drive [1]. As a result, food volatiles act as a strict sensory gate only in D. erecta [1].

## Visual feedback in the group

The motion of neighbouring flies transforms each male's visual field, which further amplifies his arousal and creates a multisensory feedback loop that promotes courtship across individuals [1]. According to the report, the visual neurons of D. erecta became active only in the presence of food odour, and males were drawn towards the more crowded zone. In groups, males courted more vigorously than when only a female was present.

Vanessa Ruta, head of the laboratory, said that this feedback gives rise to collective behaviour of the kind seen in fish schools, bird flocks and locust swarms, and that olfactory information acts as a rigid filter changing the weight of visual cues. The authors conclude that environmental cues not directly tied to sexual signalling can reorganize the social landscape so that mating occurs where reproductive opportunities are abundant [1]. D. erecta feeds on the fruit of Pandanus candelabrum from Senegal and Cameroon, which is available for only two to four months a year.

## Sources

1. [Nature](https://doi.org/10.1038/s41586-026-11209-9)
2. [focus.it](https://www.focus.it/scienza/scienze/corteggiamento-non-duetto-rito-collettivo-influenzato-contesto)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-774396a96cd8dbbe92cf3c66_food_odour_gates/