EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Stony coral fluorescing red underwater, photographed in daylight at 7 metres depth. Light excites pigments within some underwater organisms causing them to emit a fluorescent glow. Corals also harbour symbiotic algae which require light to photosynthesize and produce nutrients. It is thought that in shallower waters, the fluorescent pigments act as a sunscreen that prevents too much ultraviolet light damaging the algae. In deeper waters and lower light levels, it is thought that the fluorescent pigments absorb ultraviolet light and emit it at a wavelength which promotes photosynthesis in the symbiotic algae. Photographed in the Lembeh Strait, North Sulawesi, Indonesia.
Model release not required. Property release not required.