Cyclops vicinus shows a double-peaked rhythm of egg-laying under long-day-conditions with peaks in a distance of 12 hours. The rhythm of egg-laying is preserved after extirpation of the eyes and also after the passage of long-day-conditions to continuous illumination. The light-dark-cycle acts as a Zeitgeber, copulation is without effect on the rhythm.
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Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.