Wasp Nests Glow Green Under UV Light: A Fluorescent Phenomenon
Discovery and Observation
While exploring a forest in northern Vietnam, scientist Bernd Schöllhorn stumbled upon an unusual sight: a vibrant green orb glowing amidst the foliage. Shining an ultraviolet (UV) LED light to search for fluorescent insects, Schöllhorn initially mistook the orb for a flashlight held by another scientist. Upon closer inspection, he realized it was the open comb of a paper wasp nest emitting an ethereal green glow.
Fluorescence in Paper Wasp Nests
Under daylight, paper wasp nests appear as unassuming white or yellow structures. However, when illuminated with UV light, they transform into glowing beacons. The fluorescence originates from silk fibers that cap the hexagonal cells of the nest. These fibers absorb UV light and re-emit it at a longer wavelength, producing the characteristic green glow.
Distribution and Intensity
Schöllhorn and his team tested the nests of six different paper wasp species from Vietnam, France, and French Guiana under UV light. Remarkably, every nest exhibited fluorescence, with nests from Vietnam glowing green and those from other regions emitting a bluish hue. The glow was particularly intense, with sections of the exposed paper comb visible from up to 60 feet away.
Evolution and Purpose
Fluorescence in paper wasp nests is a relatively new discovery, and its purpose remains unknown. Scientists speculate that the green glow might serve as a visual cue for wasps to locate their nests. Alternatively, the silken caps may act as a sunshade, protecting young wasps from harmful UV radiation during metamorphosis.
Potential Applications
The discovery of fluorescent silk in paper wasp nests has sparked excitement among researchers. The chemical compounds responsible for the glow could have potential applications in biomedical research. For example, they could be used to develop new imaging techniques or targeted drug delivery systems.
Fluorescence in Other Organisms
Biofluorescence, the emission of light by living organisms, is not unique to paper wasps. It has been observed in a diverse range of species, including salamanders, frogs, corals, platypuses, wombats, and flying squirrels. These organisms absorb light and then re-emit it at a different wavelength, creating a mesmerizing array of colors.
Future Research
The discovery of fluorescence in paper wasp nests has opened up new avenues for research. Scientists are eager to unravel the chemical mechanisms behind the glow and explore its potential ecological and biomedical applications. Future studies will shed light on the evolutionary origins of this fascinating phenomenon and its significance in the natural world.
