Abstract
Summary
Further evidence is submitted that a terrestrial mammal, the hamster, has a deep-seated lunar rhythmic component which appears to be derived directly in response to subtle, pervasive geophysical variations. This is reflected in the degree of spontaneous activity and hence would obviously be importantly reflected in standard metabolic rate. The mean monthly range for the motor activity is more than 15%. This suggests that a sol-lunar rhythmic complex such as is now well-established for marine intertidal species occurs also in non-marine forms. It also suggests strongly that fluctuations in hitherto largely disregarded pervasive, weak geophysical variations have substantial influences upon mammals.
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