THE EFFECT OF LIGHT ON THE SPAWNING OF CIONA INTESTINALIS

Abstract
1. The spawning of Ciona intestinalis with respect to light was studied, using both white light and monochromatic light. 2. A one-hour dark-adaption period followed by exposure to light resulted in spawning by 66.6% of the 884 animals tested. 3. Spawning occurs an average of 27.3 minutes after the onset of illumination. 4. Illumination need not be continuous until spawning occurs; the animals spawn when returned to the dark after a short illumination period, provided they have received enough energy. 5. The action spectrum for spawning suggests cytochrome c as a chromophore.

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