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Marine Biology

, Volume 69, Issue 3, pp 253–262 | Cite as

Persistent diel rhythms in the chlorophyll fluorescence of marine phytoplankton species

  • L. E. Brand
Article

Abstract

The diel periodicities of in-vivo chlorophyll fluorescence and DCMU-enhanced chlorophyll fluorescence of 47 marine phytoplankton species were examined for 2 d in a 14 h L:10 h D light: dark cycle and then in continous light for another 2 to 3 d. Almost all phytoplankton species exhibit a more rapid increase in in-vivo fluorescence and DCMU-enhanced fluorescence during the light phase than during the dark phase. About one-half of the species examined exhibited persistent diel rhythms in continous light, indicating the operation of a biological clock. No phylogenetic or habitat related trends as to which species exhibited persistent rhythms were apparent. Of the phyla of eukaryotic phytoplankton adequately examined, none lacked biological clocks. Contrary to past hypotheses, some phytoplankton species maintain a persistent diel rhythm in a constant environment while reproducing at a rate greater than one division per day.

Keywords

Chlorophyll Phytoplankton Chlorophyll Fluorescence Dark Cycle Dark Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • L. E. Brand
    • 1
  1. 1.Biology DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA

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