Rythmic regulation of bioluminescence in glow-worm, Arachnocampa

The glow-worms of Australia and New Zealand are the carnivorous, larval stages of a fly that uses bioluminescence to attract prey to its sticky webs. Here we briefly consider the sensory stimuli that can affect the light output of glow-worms, namely vibration, sound and light. We then consider the circadian regulation of bioluminescence in the genus. It has recently been shown that light output of epigean (surface-dwelling) glow-worms comes under true circadian control. Additional experiments are described in which the response of glow-worms to artificial shortening and lengthening of the dark period is assessed. Last, we present preliminary observations that the bioluminescence of cave-dwelling glow-worms is rhythmic and discuss the possible entraining agents.