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Cell and Tissue Research

, Volume 309, Issue 1, pp 3–9 | Cite as

"What watch? ... such much!"* Complexity and evolution of circadian clocks

  • Till Roenneberg
  • Martha Merrow
Review

Abstract.

This review uses three examples to summarise our knowledge about the complexity and the evolution of circadian systems. The first example describes the ecology of unicellular algae, which use their circadian system to optimise the daily exploitation of resources that are spatially separated. The second example looks at the role of clocks in tissues and cells within a complex organism, and the third speculates on how the circadian system may have evolved.

Circadian Gonyaulax Shift worker Oscillator Light input 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Till Roenneberg
    • 1
  • Martha Merrow
    • 1
  1. 1.Institute for Medical Psychology, Chronobiology Division, Ludwig-Maximilians-Universität MünchenMunichGermany

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