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.

Item Type:	Refereed Article
Keywords:	Undaria, invasive seaweed, morphology, growth, seaweed, seasonal variation, phenotypic modulation, kelp
Research Division:	Biological Sciences
Research Group:	Plant Biology
Research Field:	Phycology (incl. Marine Grasses)
Objective Division:	Environment
Objective Group:	Control of Pests, Diseases and Exotic Species
Objective Field:	Control of Animal Pests, Diseases and Exotic Species in Coastal and Estuarine Environments
Author:	Hurd, CL (Associate Professor Catriona Hurd)
ID Code:	93152
Year Published:	1999
Web of Science® Times Cited:	21
Deposited By:	IMAS Research and Education Centre
Deposited On:	2014-07-14
Last Modified:	2014-08-04
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