Effect of high irradiance on recruitment of the giant kelp Macrocystis (Phaeophyta) in shallow water

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Graham, M. H. (1996). Effect of high irradiance on recruitment of the giant kelp Macrocystis (Phaeophyta) in shallow water. Journal of Phycology, 32(6), 903-906.
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TitleEffect of high irradiance on recruitment of the giant kelp Macrocystis (Phaeophyta) in shallow water
AuthorsM. Graham
AbstractLaboratory and field experiments were done in Stillwater Cove, Carmel Bay, California, and Monterey Harbor, California, to determine the effect of photosynthetically active radiation (PAR) on the shallow (upper) limit of giant kelp, Macrocystis pyrifera (L.) C. Agardh. At shallow, depths, M. pyrifera did not recruit or grow to macroscopic size from gametophytes or embryonic sporophytes transplanted to vertical buoy lines; sharp decreases in PAR with depth coincided with observed recruitment and sporophyte distributions. Shade manipulations indicated that settlement of M. pyrifera zoospores was decreased, but not prohibited, by high PAR. Postsettlement stages (gametophytes and embryonic sporophytes), however, survived only under shade. These results suggest that high PAR can inhibit the recruitment of M. pyrifera to shallow water by killing its postsettlement stages; whether or not ultraviolet (UV) radiation also inhibits recruitment was not tested. In either case, however, it appears that high irradiance (PAR and/or UV) regulates the shallow limit of M. pyrifera prior to temperature and desiccation stresses inherent to intertidal regions. In an additional experiment, recruitment or growth of transplanted gametophytes or embryonic sporophytes of Macrocystis integrifolia Bory also did not occur at shallow, depths, suggesting that this shallow water species accesses high irradiance regions via a method other than sexual reproduction.
JournalJournal of Phycology
Date1996
Volume32
Issue6
Start page903
End page906
ISSN0022-3646
Subjectsgiant kelp, irradiance, macroalgae, photosynthetically active radiation, recruitment, shallow water, USA, California, Macrocystis pyrifera
NoteCited By (since 1996):31, Seaweeds, CODEN: JPYLA

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