Abstract
1. 1. An endogenous circadian rhythm of oxygen consumption was demonstrated in the amphipod Talitrus sakator. A low diurnal respiratory rate of approximately 0.55 μl O 2 mg −1 hr −1 was recorded with a nocturnal increase of between 137–195%. 2. 2. The circadian pattern was reflected in the oxygen consumption rate-size regression relationship, and the experimental significance of the rhythm was highlighted. 3. 3. The respiratory quotient of individually monitored amphipods was 0.80, suggesting lipid to be the major storage product used in basic metabolism.
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