Abstract
NUMEROUS investigations have suggested persistent diurnal physiological rhythmicity to be the rule among organisms, inhabiting the natural day–night environment. However, the only report known to me of results of a study of an animal fully removed for innumerable generations from such daily changes in light and temperature, the case of the cave crayfish, Orconectes pellucidus (Tellkampf), clearly established that these possess no difference in activity between day-time and night-time when kept under controlled conditions in the laboratory1.
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References
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BROWN, F. Diurnal Rhythm in Cave Crayfish. Nature 191, 929–930 (1961). https://doi.org/10.1038/191929b0
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DOI: https://doi.org/10.1038/191929b0
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