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Science 8 March 1974:
Vol. 183. no. 4128, pp. 970 - 972
DOI: 10.1126/science.183.4128.970
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Articles

Suppressing Drosophila Circadian Rhythm with Dim Light

Arthur T. Winfree 1

1 Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907

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.


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