Plants, fungi, and even animals sometimes develop fluorescence for one reason or another. We're also familiar with animals who are genetically engineered to glow under a black light. But science has apparently not yet looked for all the biological structures that may fluoresce when the opportunity arises. A team of researchers went out after dark looking through the tropical forests of northern Vietnam (which sounds like quite an adventure in itself) with a black light, and were surprised to find wasps nests that glowed green!
The team initially set out to discover unknown fluorescent insects in tropical rainforests, so they'd come equipped with UV LED torches. "We were not searching for wasp nests in particular," Schöllhorn said. "To our knowledge, this phenomenon has not been observed in the past, neither by scientific researchers nor by any photographers."
When exposed to white light, the nest cocoon caps appear bright white. Their verdant fluorescence begins to appear under normal daylight, and at night under a UV torch, the bright green glow of the nests can be seen up to 65 feet (20 meters) away, the authors wrote in their report, published Tuesday (Aug. 24) in the Journal of the Royal Society Interface.
The wasps were of the genus Polistes, so the scientists checked out other species of the same genus from France and the Amazon rainforest. Those wasp nests also glowed under a UV light, although with slightly different colors and intensities. The next question is why the wasps evolved to build fluorescent nests. They certainly didn't do it waiting for someone to come along with a blacklight! There are quite a few possibilities, which you can read about at Live Science. -via Damn Interesting
(Image credit: Bernd Schöllhorn and Serge Berthier)