Abstract
IN intertidal organisms the rates at which various physiological functions proceed are often related to the state of the tide. In a habitat in which environmental conditions change so drastically with the ebb and flow of the tidal waters, this is not particularly surprising. What is remarkable is that the rate of many of these functions continues to vacillate in approximate synchrony with the tide when organisms are removed to non-tidal, constant conditions in the laboratory. These persistent vacillations are referred to as tidal or bimodal lunar day rhythms. By way of example, persistent tidal rhythms have been described for oxygen consumption in crabs1; vertical migrations of planarians2 and diatoms3; colour change in crabs4; spontaneous activity in crabs5,6, amphipods7,8, and fish9; and filtration rate in mussels10.
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PALMER, J. Daily and Tidal Components in the Persistent Rhythmic Activity of the Crab, Sesarma. Nature 215, 64–66 (1967). https://doi.org/10.1038/215064a0
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DOI: https://doi.org/10.1038/215064a0
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