
doi: 10.1007/bf00344920
pmid: 28310975
In 1963 Harris reported a circadian rhythm of 28 hours in Daphnia magna (Crustacea, Cladocera). Many endogenous periodicities have been described, mostly in vertebrates and plants, seldom in planktonic crustaceans, but a free-running period of 28 hours in continuous light is never a common phenomenon. This might be the reason why the data of Harris were not implicitly accepted by all authors working in the field of circadian rhythms (Enright et al., 1967).
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