Effects of seasonal growth rate on morphological variation of Undaria pinnatifida (Alariaceae, Phaeophyceae)

  • M. D. Stuart
  • C. L. Hurd
  • M. T. Brown
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 137)


Undaria pinnatifida (Harvey) Suringar is currently divided into two morphological forms, f. typica Yendo. and f. distans Miyabe & Okamura. The objective of this study was to determine the effects of seasonal variation in growth rate on the morphology of U pinnatifida, and to define the form of U. pinnatifida growing in Otago Harbour, New Zealand. Morphological variables (stipe length, blade length, blade width, sporophyll length and degree of blade incision), growth rates (frond, blade and stipe) and blade erosion were measured each month from August 1993 to February 1995, and compared using correspondence analysis. Variation in the morphology of U pinnatifida was largely accounted for by varying growth rates. Definition of the form of U pinnatifida growing in Otago Harbour is equivocal because morphological characteristics of both f. typica and f. distans were exhibited at different times of the year.

Key words

seaweed morphology seasonal variation growth phenotypic modulation kelp Undaria pinnatifida 


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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • M. D. Stuart
    • 1
  • C. L. Hurd
    • 1
  • M. T. Brown
    • 2
  1. 1.Department of BotanyUniversity of OtagoDunedinNew Zealand
  2. 2.Marine Biology and Ecotoxicology Group, Department of Biological Sciences and Plymouth Environmental Research CentreUniversity of PlymouthPlymouthUK

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