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Journal of Biological Rhythms
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The Effects of Temperature on the Circadian Rhythms of Flashing and Glow in Gonyaulax polyedra: Are the Two Rhythms Controlled by Two Oscillators?

Frank Von der Heyde

Department of Biology, University of Bremen, D-2800 Bremen, Germany

Andreas Wilkens

Department of Biology, University of Bremen, D-2800 Bremen, Germany

Ludger Rensing

Department of Biology, University of Bremen, D-2800 Bremen, Germany

Circadian rhythms of flashing and glow were recorded simultaneously in Gonyaulax polyedra by determining maximum and minimum light emission at each measured interval of 28 sec. In constant light, the two rhythms in some cases showed different period lengths ({tau}), the glow rhythm being up to 1 hr shorter than the flashing rhythm. Lower temperatures shortened the {tau} of the glow rhythm more than that of the flashing rhythm. The amplitude of the flashing rhythm decreased when the temperature was increased from 15°C to 25°C, whereas that of the glow rhythm was increased. These results may indicate that the two rhythms are controlled by two separate oscillators.

Key Words: bioluminescence • circadian rhythms • coupled oscillators • Gonyaulax polyedra • temperature effects

Journal of Biological Rhythms, Vol. 7, No. 2, 115-123 (1992)
DOI: 10.1177/074873049200700203
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