A. Castric-Fey, C. Beaupoil, J. Bouchain, E. Pradier, M. Th. L’Hardy-Halos
The Introduced Alga Undaria pinnatifida (Laminariales, Alariaceae) in the Rocky Shore Ecosystem of the St Malo Area: Morphology and Growth of the Sporophyte
This study deals with a population of Undaria pinnatifida (Harvey) Suringar, established in the coastal area around St Malo. In another study, during a monthly monitoring program, growth rate was estimated. Simultaneous morphological observations permitted the identification of two morphs, one resembling f. typica and the other f. distans. Anatomical characters of the two morphs are the same. The punched-holes method and the induced bifurcation of thalli permitted estimation of the contribution of the stipo-frondal region to overall growth. The structure of the midrib, pinnules and sporophylls are described and new data are given about the formation of Yendo cells. These latter serve as an early distinctive character between Undaria pinnatifida and Saccorhiza polyschides (Lightfoot) Batters which does not possess such cells. This criterion was used to identify juvenile blades in the study of monthly recruitment. Thallus morphology and bifurcation are discussed.
Botanica Marina, Walter de Gruyter
Print ISSN: 0006-8055
Volume: 42, 01/1999
Pages: 71 - 82
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