Abstract
1. 1. The electrical response to light (electroretinogram, ERG) from dissected eyestatks of crayfish placed in normal, calcium-rich and calcium-free Van Harreveld solution was recorded during three or more consecutive days. 2. 2. In these experimental conditions the amplitude of ERG showed both high frequency and circadian cycles, which varied both in period and amplitude depending on the solution employed. 3. 3. In contrast, the distal pigment index did not show circadian activity when eyestalks were treated with the same experimental conditions. 4. 4. The role of calcium in the amplitude of ERG, in periodical activity of eyestalk, and in distal pigment position is discussed. 5. 5. It is proposed that calcium reinforces the coupling mechanisms underlying the ERG circadian rhythm in the crayfish eyestalk.
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