, Volume 165, Issue 4, pp 548–553 | Cite as

Porphyra nereocystis: A dual-daylength seaweed

  • L. G. Dickson
  • J. R. Waaland


Conchospores from the perennial conchocelis phase of the annual, epiphytic, marine red alga Porphyra nereocystis Anderson, which in nature lives on the large annual kelp Nereocystis luetkeana (Mertens) Postels et Ruprecht, are released in culture only in response to a short-day photoperiod treatment followed by a long-day treatment. Each treatment requires a minimum of three to four weeks and is enhanced by lower temperature during the second photoperiod treatment. To our knowledge P. nereocystis is the first known dualdaylength seaweed and requires a short-day-longday treatment for completion of its life cycle. This stringent environmental control of its reproduction appears to be an adaptation to coordinate conchospore production with the seasonal availability of its host kelp Nereocystis.

Key words

Epiphytism Life cycle Nereocystis Photoperiodism (algae) Phaeophyta Porphyra Rhodophyta Seasonality 



long day


short day


shortlong day


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • L. G. Dickson
    • 1
  • J. R. Waaland
    • 1
  1. 1.Department of Botany, KB-15University of WashingtonSeatleUSA

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