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Ultraviolet vision in a bat.

York Winter1, Jorge López, Otto Von Helversen

  • 1Department of Biology, University of Munich, Luisenstrasse 14, 80333 Munich, Germany and Max-Planck Research Centre for Ornithology, 82305 Seewiesen, Germany. winter@zi.biologie.uni-muenchen.de

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|October 10, 2003
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Summary
This summary is machine-generated.

This study reveals that the flower bat Glossophaga soricina, despite being color-blind, possesses ultraviolet (UV) vision. This UV sensitivity is mediated by a single photoreceptor, a novel mechanism in mammals.

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Area of Science:

  • Mammalian vision
  • Sensory biology
  • Comparative physiology

Background:

  • Most mammals exhibit dichromatic vision, limiting their color perception.
  • Ultraviolet (UV) vision in mammals is rare and typically involves a distinct photoreceptor.
  • Bats utilize both echolocation and vision for orientation.

Purpose of the Study:

  • To investigate the visual capabilities of the phyllostomid flower bat, Glossophaga soricina.
  • To determine if this bat species possesses UV vision and understand its underlying mechanism.
  • To explore the spectral sensitivity and color vision of G. soricina.

Main Methods:

  • Behavioral experiments were conducted to assess spectral sensitivity.
  • Tests for color vision were performed.
  • Chromatic adaptation was used to probe photoreceptor function.

Main Results:

  • Glossophaga soricina demonstrated spectral sensitivity peaking at 510 nm (green) and above 365 nm (UV).
  • The bat was found to be color-blind, with a negative result in color vision tests.
  • Chromatic adaptation indicated a single photoreceptor is responsible for both UV and green light sensitivity.

Conclusions:

  • The flower bat G. soricina exhibits UV vision, detecting wavelengths as low as 310 nm.
  • UV sensitivity is likely mediated by the beta-band of the visual pigment, a previously undescribed mechanism in intact mammalian systems.
  • This finding expands our understanding of mammalian visual diversity and UV perception.