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Circadian Components of Semilunar and Lunar Timing Mechanisms

Lehrstuhl für Physiologische Ökologie, Zoologisches Institut der Universität, D-5000 Köln 41, Federal Republic of Germany

The timing of semilunar as well as lunar reproductive rhythms has been analyzed in different geographic populations of the intertidal chironomid Clunio. In stocks of three populations differing in period and phase relationship with the lunar month, these long-term rhythms were synchronized in the laboratory by using artificial moonlight cycles of 30 days in otherwise 24-hr light-dark (LD) cycles (0.4 lux during 4 successive nights every 30 days in LD 12:12). In LD cycles of various periods, a strong synchronization was only possible in LD 12:12 and LD 11:11, whereas in LD 10:10 and LD 15:15 the synchronization by the 30-"day" moonlight cycle was weak or even absent.

Journal of Biological Rhythms, Vol. 4, No. 2, 173-182 (1989)
DOI: 10.1177/074873048900400213


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