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Quantifying visual acuity in Heliconius butterflies.

Daniel Shane Wright1, Anupama Nayak Manel1, Michelle Guachamin-Rosero1,2

  • 1Division of Evolutionary Biology, Faculty of Biology, LMU Munich, Planegg-Martinsried, Germany.

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|December 13, 2023
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Summary
This summary is machine-generated.

This study estimates visual acuity in Heliconius butterflies for the first time, finding males have sharper vision than females. This impacts how butterflies perceive wing patterns compared to predators.

Keywords:
aposematismcolour patternsensory perception

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Area of Science:

  • Animal behavior
  • Evolutionary biology
  • Sensory ecology

Background:

  • Heliconius butterflies use colorful wing patterns for predator deterrence and mate choice.
  • Understanding visual abilities is crucial for interpreting the function of these signals.
  • Previous research focused on color vision and neural anatomy, but visual acuity remained unstudied.

Purpose of the Study:

  • To provide the first quantitative estimate of visual acuity in Heliconius butterflies.
  • To compare visual acuity between male and female Heliconius.
  • To assess how Heliconius visual acuity impacts their perception of visual signals relative to avian predators.

Main Methods:

  • A behavioral optomotor assay was used to measure visual acuity.
  • Eye morphology, including ommatidia count, was examined.
  • Visual perception was estimated by comparing butterfly and avian predator resolving power.

Main Results:

  • Mean visual acuity in Heliconius butterflies was estimated at 0.49 cycles-per-degree (cpd).
  • Males exhibited significantly higher visual acuity than females.
  • Male Heliconius eyes possess more ommatidia compared to female eyes.
  • While avian predators retain high resolving power, Heliconius butterflies lose detail perception at greater distances.

Conclusions:

  • This study establishes baseline visual acuity for Heliconius, revealing sexual dimorphism.
  • The findings suggest Heliconius may rely more on color than fine detail for long-distance signaling.
  • Results provide critical insights for evolutionary studies on Heliconius wing pattern diversification and speciation.