Wed, Mar 15, 2017 - Page 6 News List

World’s first fluorescent frog found in Argentina

ALL THINGS BRIGHT:In normal light the polka-dot tree frog found in Argentina’s Amazon basin has a dull complexion, but under ultraviolet light it glows bright fluorescent green

The Guardian

The world’s first fluorescent frog has been discovered in the Amazon basin in Argentina.

Scientists at the Bernardino Rivadavia Natural Sciences Museum in Buenos Aires made the discovery by accident while studying the pigment of polka-dot tree frogs, a species common to the rainforest.

In normal light the frog appears to have a dull, mottled browny-green skin with red dots, but under ultraviolet (UV) light it glows a bright fluorescent green.

Fluorescence — the ability to absorb light at short wavelengths and re-emit it at longer wavelengths — is uncommon in creatures that live on land.

The translucent frog was found to use a combination of lymph and glandular emissions to fluoresce.

The researchers, who published their discovery on Monday in the Proceedings of the National Academy of Sciences, found that the trait enhanced the brightness of the frog by between 19 and 29 percent depending on the level of ambient light in its surroundings.

The compound causing the blue-green glow of the polka-dot tree frog was not previously thought to exist in vertebrates and its discovery has excited researchers.

“This is very different from fluorophores found in other vertebrates, which are usually proteins or polyenic chains,” Maria Gabriella Lagoria, a photochemist at the University of Buenos Aires and study coauthor, told Chemistry World.

The discovery opens up the possibility that other amphibians might be able to fluoresce, particularly those with translucent skin similar to that of the tree frog.

Speaking to the journal Nature, which first published news of the fluorescent frog, coauthor Julian Faivovich expressed his hope that the discovery would inspire interest in the phenomenon, adding that he hoped scientists would “start carrying a UV flashlight to the field.”

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