Bioluminescence

Definition

The emission of visible light by a living organism resulting from a chemiluminescent reaction, typically involving the oxidation of a light-emitting pigment (luciferin) catalyzed by an enzyme (luciferase). In arthropods, the light may be produced autogenically by the organism's own tissues or bacteriogenically by symbiotic luminescent bacteria. Functions include predator avoidance, prey attraction, mate recognition, and illumination.

Etymology

From Greek bios (life) + Latin lumen (light) + -escentia (beginning to be), referring to the living origin of the light production.

Example

Adult fireflies (Lampyridae) use species-specific flash patterns of autogenic bioluminescence to locate mates on summer evenings, with males typically patrolling while stationary females respond to conspecific signals.

Synonyms

• cold light

Related Terms

• luciferin
• luciferase
• photophore
• chemiluminescence
• aposematism
• firefly
• glow-worm

Usage Notes

Distinguish from fluorescence (re-emission of absorbed light) and phosphorescence (delayed light emission from excited states); bioluminescence is enzymatic and generates light without prior light absorption. In entomology, autogenic bioluminescence is characteristic of beetles (Lampyridae, Phengodidae, Elateridae), while bacteriogenic bioluminescence occurs in some marine crustaceans and cephalopods but is rare in terrestrial arthropods. The term is a mass noun with no standard plural form.