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The Role of Endogenous Rhythms in Vertical Migration

Published online by Cambridge University Press:  11 May 2009

John E. Harris
Affiliation:
Department of Zoology, University of Bristol

Extract

Photographic recording at hourly intervals of a group of animals contained in a small tank kept in continuous darkness has revealed a 24 h cycle of locomotor activity in Daphnia magna and in Calanus helgolandic

A change in periodicity of the rhythm in Daphnia kept under continuous illumination suggests that the cycle is not determined by external stimuli

The phasing of the cycle differs in the two animals, but in both there is an increase in activity during the hours of darkness.

In Calanus and possibly also in Daphnia, the cycle of activity is absent in the winter months.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1963

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