Si on met des mouches à fruit dans un endroit très sombre, elles vont quoi faire ?
Physical appearance

Unlike humans, the sex and physical appearance of fruit flies is not influenced by hormones. The appearance and sex of fruit flies is determined only by genetic information.

Female fruit flies are substantially larger than male fruit flies, with females having bodies that are up to 30% larger than an adult male.

Wild type fruit flies are yellow-brown, with brick-red eyes and transverse black rings across the abdomen. The black portions of the abdomen are the inspiration for the species name (melanogaster = "black-bellied"). The brick-red color of the eyes of the wild type fly are due to two pigments: xanthommatin, which is brown and is derived from tryptophan, and drosopterins, which are red and are derived from guanosine triphosphate. They exhibit sexual dimorphism; females are about 2.5 mm (0.10 in) long; males are slightly smaller. Furthermore, males have a cluster of spiky hairs (claspers) surrounding the reproducing parts used to attach to the female during mating. Extensive images are found at FlyBase.

Drosophila melanogaster can be distinguished from related species by the following combination of features: gena ~1/10 diameter of eye at greatest vertical height; wing hyaline and with costal index 2.4; male protarsus with a single row of ~12 setae forming a sex comb; male epandrial posterior lobe small and nearly triangular; female abdominal tergite 6 with dark band running to its ventral margin; female oviscapt small, pale, without dorsodistal depression and with 12-13 peg-like outer ovisensilla.

Drosophila melanogaster flies can sense air currents with the hairs on their backs. Their eyes are sensitive to slight differences in light intensity and will instinctively fly away when a shadow or other movement is detected.
Parasites

Les goyaves sont l'un des hôtes les plus courants pour les mouches des fruits comme A. suspensa, qui pondent leurs œufs dans les goyaves trop mûres ou gâtées. Les larves de ces mouches consomment ensuite le fruit jusqu'à atteindre le stade de pupe. Ce parasitisme a entraîné des pertes économiques de millions de dollars pour les nations d'Amérique centrale.

Les agents pathogènes fongiques, les espèces Neopestalotiopsis et Pestalotiopsis, sont responsables du verruquage des goyaves en Colombie.
### Query ###
Si on met des mouches à fruit dans un endroit très sombre, elles vont quoi faire ?

### Main Text ###
Physical appearance

Unlike humans, the sex and physical appearance of fruit flies is not influenced by hormones. The appearance and sex of fruit flies is determined only by genetic information.

Female fruit flies are substantially larger than male fruit flies, with females having bodies that are up to 30% larger than an adult male.

Wild type fruit flies are yellow-brown, with brick-red eyes and transverse black rings across the abdomen. The black portions of the abdomen are the inspiration for the species name (melanogaster = "black-bellied"). The brick-red color of the eyes of the wild type fly are due to two pigments: xanthommatin, which is brown and is derived from tryptophan, and drosopterins, which are red and are derived from guanosine triphosphate. They exhibit sexual dimorphism; females are about 2.5 mm (0.10 in) long; males are slightly smaller. Furthermore, males have a cluster of spiky hairs (claspers) surrounding the reproducing parts used to attach to the female during mating. Extensive images are found at FlyBase.

Drosophila melanogaster can be distinguished from related species by the following combination of features: gena ~1/10 diameter of eye at greatest vertical height; wing hyaline and with costal index 2.4; male protarsus with a single row of ~12 setae forming a sex comb; male epandrial posterior lobe small and nearly triangular; female abdominal tergite 6 with dark band running to its ventral margin; female oviscapt small, pale, without dorsodistal depression and with 12-13 peg-like outer ovisensilla.

Drosophila melanogaster flies can sense air currents with the hairs on their backs. Their eyes are sensitive to slight differences in light intensity and will instinctively fly away when a shadow or other movement is detected.

### Supplementary Text ###
Parasites

Les goyaves sont l'un des hôtes les plus courants pour les mouches des fruits comme A. suspensa, qui pondent leurs œufs dans les goyaves trop mûres ou gâtées. Les larves de ces mouches consomment ensuite le fruit jusqu'à atteindre le stade de pupe. Ce parasitisme a entraîné des pertes économiques de millions de dollars pour les nations d'Amérique centrale.

Les agents pathogènes fongiques, les espèces Neopestalotiopsis et Pestalotiopsis, sont responsables du verruquage des goyaves en Colombie.

### Draft ###

### 1. Query Parsing

"Si on met des mouches à fruit dans un endroit très sombre" 
→ "If you put fruit flies in a very dark place, what will they do?"

※ "Mouches à fruit" = fruit flies (Drosophila spp., typically melanogaster)
※ "Très sombre" = extremely dark, not just dim light
※ Seeking behavioral prediction, not morphological description

### 2. Domain Contextualization  

⟨H≈0.3⟩ Drosophila laboratory behavior... what do we know? Phototactic responses well-documented. Positive phototaxis typically observed in standard conditions. But darkness? Most studies focus on light avoidance, not prolonged darkness tolerance.

● High confidence: fruit flies navigate via visual cues
◐ Partial: specific dark adaptation protocols limited in literature
○ Low confidence: prolonged darkness behavioral outcomes

### 3. Biological Constraints Analysis

Physical limitations:
- Compound eyes: ~800 facets each, sensitive to UV-visible spectrum
- Flight muscles: require visual feedback for coordination
- Circadian rhythms: light-dark cycles entrain behavioral patterns

∴ Complete darkness likely disrupts normal function

### 4. Behavioral Prediction Framework

Baseline expectation: ● Phototactic avoidance (light-seeking in dim conditions)

Darkness scenarios:
├─ Immediate response: likely freeze, disorientation
├─ Short-term (hours): potential starvation, reduced activity  
├─ Medium-term (days): behavioral abnormalities, stress responses
└─ Long-term (weeks): ? survival compromised, reproductive failure

⟨H≈0.8⟩ But laboratory flies... bred for docility, different from wild? Maybe darkness triggers ancestral predator avoidance responses? Hiding behavior? Or simply exhaustion from failed flight attempts? The literature gap here is striking - researchers assume light availability for experimental conditions...

### 5. Uncertainty Assessment

P(significant behavioral changes | complete darkness) ≈ 0.7-0.9
P(survival beyond 24h | complete darkness) ≈ 0.4-0.6
P(return to normal | light reintroduced) ≈ 0.8-0.9

⚠ Major limitation: most behavioral studies use dim laboratory lighting, not true darkness

### 6. Synthesis

Response framework:
1. Acknowledge phototactic baseline ●
2. Predict immediate disorientation/freezing ●  
3. Note activity reduction likely ◐
4. Highlight experimental gap regarding prolonged darkness ●
5. Emphasize species/condition dependency ●

⟨H≈0.2⟩ The honest answer: we don't know precisely what happens to fruit flies in complete darkness because researchers avoid such extreme conditions. They're model organisms, yes, but even in laboratories, some degree of lighting is assumed necessary for normal behavioral observation and experimental control.

∴ Response should acknowledge uncertainty while providing biologically plausible predictions based on known constraints and behavioral patterns.

### Answer###
Les mouches à fruit (Drosophila melanogaster) sont des insectes qui réagissent instinctivement aux changements d'environnement, notamment à l'intensité lumineuse. Elles peuvent détecter de légères différences d'intensité lumineuse grâce à leurs yeux et fuiront instinctivement lorsqu'une ombre ou tout autre mouvement est détecté.

Dans l'obscurité totale et prolongée, ces comportements de fuite et d'évitement seraient probablement affectés, mais je ne peux pas vous donner de détails spécifiques sur ce qui se passerait exactement dans ce scénario extrême. Les mouches à fruit sont des animaux très sensibles à leur environnement et leur comportement dépend fortement des conditions qu'elles y trouvent, notamment de la disponibilité de la lumière pour orienter leurs mouvements et leurs activités.