Suppressing Drosophila Circadian Rhythm with Dim Light

See allHide authors and affiliations

Science  08 Mar 1974:
Vol. 183, Issue 4128, pp. 970-972
DOI: 10.1126/science.183.4128.970


Drosophila larvae were reared and allowed to pupate in continuous bright white light. The pupae were then transferred to a much dimmer blue light. In continuous blue light of intensity below 0.001 erg per square centimeter per second, adult flies emerged in pulses 24.7 hours apart, each pulse occupying about 6 hours. But in continuous light of intensity exceeding 0.1 erg per square centimeter per second, they emerged at a steady rate. This intensity range from effective darkness to effective light is roughly from starlight to moonlight. Inside this range, the emergence peaks broaden for about a week with little change of period.