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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Naturally occurring fluorescence in frogs.

Carlos Taboada1,2, Andrés E Brunetti3, Federico N Pedron2,4

  • 1División Herpetología, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad de Buenos Aires C1405DJR, Argentina.

Proceedings of the National Academy of Sciences of the United States of America
|March 15, 2017
PubMed
Summary
This summary is machine-generated.

Fluorescent compounds, hyloins, were discovered in the tree frog Hypsiboas punctatus. This fluorescence enhances frog brightness, potentially aiding nocturnal vision and communication.

Keywords:
AmphibiaAnuraHylidaefluorophorevisual ecology

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Area of Science:

  • Zoology
  • Biochemistry
  • Ecology

Background:

  • Fluorescence, the emission of light at longer wavelengths after absorbing shorter wavelengths, is rare in tetrapods.
  • Its biological roles in terrestrial vertebrates remain largely unexplored.

Purpose of the Study:

  • To investigate and characterize fluorescence in amphibians.
  • To determine the source and chemical basis of fluorescence in the tree frog Hypsiboas punctatus.
  • To assess the ecological significance of fluorescence in nocturnal visual perception.

Main Methods:

  • Spectroscopic analysis of fluorescence in living frogs.
  • Chemical isolation and identification of fluorescent compounds.
  • Quantification of fluorescence contribution to light emission under low-light conditions.

Main Results:

  • Fluorescence in Hypsiboas punctatus originates from a combination of lymph and glandular secretions, filtered by skin pigment cells.
  • A novel class of fluorescent compounds, derived from dihydroisoquinolinone (hyloins), was identified as the chemical source.
  • Fluorescence significantly enhances frog brightness (18-29%) in twilight and nocturnal conditions, potentially improving visual signaling.

Conclusions:

  • This study reveals an unprecedented source of pigmentation in amphibians through fluorescence.
  • Fluorescence in frogs may play a crucial role in visual perception and communication in nocturnal environments.
  • The discovery of hyloins opens new avenues for understanding the evolution and function of fluorescence in terrestrial vertebrates.