Creatures of Light

Many people have seen swarms of fireflies flashing on a summer night, but are less likely to be familiar with luminescent creatures found elsewhere, particularly the ocean depths, where they put on a display that one observer here calls an "aquatic Times Square." Filmmaker Alan Ritsko's PBS-aired NOVA/National Geographic documentary looks at the colorful and often hidden world of bioluminescent creatures who glow, flash, and sparkle to stun or confuse enemies, attract a mate, cloak themselves, or simply lure a meal. Luminosity is much more widespread than previously thought (in fact, nearly 90 percent of life forms shine underwater). For many creatures, it represents an evolutionary survival tactic; for fireflies (which are actually members of the beetle family), lighting up indicates "I'm here!" to the opposite sex. The documentary also examines the world of biofluorescence, a process of absorbing light, which is particularly common in the coral reefs. In recent years, scientists have been studying this underwater phenomenon, hoping to find clues that could ultimately aid humans in tracking the progression of cancer cells and viruses, as well as mapping the human brain. In addition, the film discusses how biofluorescence could help fight pollution, and even save energy by having fluorescent trees lighting up our cities. A beautifully-lensed documentary on an illuminating subject, this is recommended. Aud: H, C, P. (S. Rees)