Summary Points
Vulnerable fire salamanders fluoresce green and cyan under ultraviolet light, mainly through skin secretions.
Their skin secretions remain fluorescent for over 24 hours after leaving the salamanders’ bodies.
Fluorescence may aid communication, mate recognition, or predator warnings, though its purpose remains unconfirmed.
Scientists seek the unknown fluorescent molecule, hoping its discovery clarifies behavior and supports conservation.
A Hidden Signal in Familiar Skin
Fire salamanders are known for bold yellow-and-black markings and toxic skin secretions. Now, researchers have found another surprise: Under ultraviolet light, parts of the salamanders glow green and cyan.
The effect is strongest on yellow areas along the underside and sides. It comes mainly from skin glands and their secretions, which can keep glowing for more than 24 hours outside the animal.
This is biofluorescence, not the self-made light of a firefly. The salamander absorbs ultraviolet light and releases some of that energy as visible color. People need a UV lamp to see it.
What the Glow Might Do
The purpose remains unknown. One possibility is that the glow helps salamanders find or recognize one another in dark, dense forests. It could also help them assess potential mates.
Alternatively, fluorescence may strengthen the animals’ warning display. Their bright markings already signal danger to predators, and a glow might make those colors more noticeable. However, researchers have not yet shown that predators respond to it.
A Discovery With Conservation Value
Scientists still need to identify the chemical behind the glow and test how it affects salamander behavior. That work could reveal new details about the species’ biology and the role of its toxic secretions.
The finding also shows how new tools can uncover traits in animals studied for decades. For conservation, understanding how salamanders communicate and avoid predators may clarify what they need to survive. That matters because habitat loss and fragmentation threaten the species, which is classified as vulnerable. The glow is no quick fix, but each new insight can help guide efforts to protect its forest home.
Expand Your Tech Knowledge
Explore the future of technology with our detailed insights on Artificial Intelligence.
Explore groundbreaking research and scientific advancements at the National Science Foundation (NSF).
Sci-BioV1
